cytoscape-ngraph.forcelayout.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}(g.cytoscapeNgraph || (g.cytoscapeNgraph = {})).forcelayout = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
(function (process){
// vim:ts=4:sts=4:sw=4:
/*!
 *
 * Copyright 2009-2012 Kris Kowal under the terms of the MIT
 * license found at http://github.com/kriskowal/q/raw/master/LICENSE
 *
 * With parts by Tyler Close
 * Copyright 2007-2009 Tyler Close under the terms of the MIT X license found
 * at http://www.opensource.org/licenses/mit-license.html
 * Forked at ref_send.js version: 2009-05-11
 *
 * With parts by Mark Miller
 * Copyright (C) 2011 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

(function (definition) {
    "use strict";

    // This file will function properly as a <script> tag, or a module
    // using CommonJS and NodeJS or RequireJS module formats.  In
    // Common/Node/RequireJS, the module exports the Q API and when
    // executed as a simple <script>, it creates a Q global instead.

    // Montage Require
    if (typeof bootstrap === "function") {
        bootstrap("promise", definition);

    // CommonJS
    } else if (typeof exports === "object" && typeof module === "object") {
        module.exports = definition();

    // RequireJS
    } else if (typeof define === "function" && define.amd) {
        define(definition);

    // SES (Secure EcmaScript)
    } else if (typeof ses !== "undefined") {
        if (!ses.ok()) {
            return;
        } else {
            ses.makeQ = definition;
        }

    // <script>
    } else if (typeof window !== "undefined" || typeof self !== "undefined") {
        // Prefer window over self for add-on scripts. Use self for
        // non-windowed contexts.
        var global = typeof window !== "undefined" ? window : self;

        // Get the `window` object, save the previous Q global
        // and initialize Q as a global.
        var previousQ = global.Q;
        global.Q = definition();

        // Add a noConflict function so Q can be removed from the
        // global namespace.
        global.Q.noConflict = function () {
            global.Q = previousQ;
            return this;
        };

    } else {
        throw new Error("This environment was not anticipated by Q. Please file a bug.");
    }

})(function () {
"use strict";

var hasStacks = false;
try {
    throw new Error();
} catch (e) {
    hasStacks = !!e.stack;
}

// All code after this point will be filtered from stack traces reported
// by Q.
var qStartingLine = captureLine();
var qFileName;

// shims

// used for fallback in "allResolved"
var noop = function () {};

// Use the fastest possible means to execute a task in a future turn
// of the event loop.
var nextTick =(function () {
    // linked list of tasks (single, with head node)
    var head = {task: void 0, next: null};
    var tail = head;
    var flushing = false;
    var requestTick = void 0;
    var isNodeJS = false;
    // queue for late tasks, used by unhandled rejection tracking
    var laterQueue = [];

    function flush() {
        /* jshint loopfunc: true */
        var task, domain;

        while (head.next) {
            head = head.next;
            task = head.task;
            head.task = void 0;
            domain = head.domain;

            if (domain) {
                head.domain = void 0;
                domain.enter();
            }
            runSingle(task, domain);

        }
        while (laterQueue.length) {
            task = laterQueue.pop();
            runSingle(task);
        }
        flushing = false;
    }
    // runs a single function in the async queue
    function runSingle(task, domain) {
        try {
            task();

        } catch (e) {
            if (isNodeJS) {
                // In node, uncaught exceptions are considered fatal errors.
                // Re-throw them synchronously to interrupt flushing!

                // Ensure continuation if the uncaught exception is suppressed
                // listening "uncaughtException" events (as domains does).
                // Continue in next event to avoid tick recursion.
                if (domain) {
                    domain.exit();
                }
                setTimeout(flush, 0);
                if (domain) {
                    domain.enter();
                }

                throw e;

            } else {
                // In browsers, uncaught exceptions are not fatal.
                // Re-throw them asynchronously to avoid slow-downs.
                setTimeout(function () {
                    throw e;
                }, 0);
            }
        }

        if (domain) {
            domain.exit();
        }
    }

    nextTick = function (task) {
        tail = tail.next = {
            task: task,
            domain: isNodeJS && process.domain,
            next: null
        };

        if (!flushing) {
            flushing = true;
            requestTick();
        }
    };

    if (typeof process === "object" &&
        process.toString() === "[object process]" && process.nextTick) {
        // Ensure Q is in a real Node environment, with a `process.nextTick`.
        // To see through fake Node environments:
        // * Mocha test runner - exposes a `process` global without a `nextTick`
        // * Browserify - exposes a `process.nexTick` function that uses
        //   `setTimeout`. In this case `setImmediate` is preferred because
        //    it is faster. Browserify's `process.toString()` yields
        //   "[object Object]", while in a real Node environment
        //   `process.nextTick()` yields "[object process]".
        isNodeJS = true;

        requestTick = function () {
            process.nextTick(flush);
        };

    } else if (typeof setImmediate === "function") {
        // In IE10, Node.js 0.9+, or https://github.com/NobleJS/setImmediate
        if (typeof window !== "undefined") {
            requestTick = setImmediate.bind(window, flush);
        } else {
            requestTick = function () {
                setImmediate(flush);
            };
        }

    } else if (typeof MessageChannel !== "undefined") {
        // modern browsers
        // http://www.nonblocking.io/2011/06/windownexttick.html
        var channel = new MessageChannel();
        // At least Safari Version 6.0.5 (8536.30.1) intermittently cannot create
        // working message ports the first time a page loads.
        channel.port1.onmessage = function () {
            requestTick = requestPortTick;
            channel.port1.onmessage = flush;
            flush();
        };
        var requestPortTick = function () {
            // Opera requires us to provide a message payload, regardless of
            // whether we use it.
            channel.port2.postMessage(0);
        };
        requestTick = function () {
            setTimeout(flush, 0);
            requestPortTick();
        };

    } else {
        // old browsers
        requestTick = function () {
            setTimeout(flush, 0);
        };
    }
    // runs a task after all other tasks have been run
    // this is useful for unhandled rejection tracking that needs to happen
    // after all `then`d tasks have been run.
    nextTick.runAfter = function (task) {
        laterQueue.push(task);
        if (!flushing) {
            flushing = true;
            requestTick();
        }
    };
    return nextTick;
})();

// Attempt to make generics safe in the face of downstream
// modifications.
// There is no situation where this is necessary.
// If you need a security guarantee, these primordials need to be
// deeply frozen anyway, and if you don’t need a security guarantee,
// this is just plain paranoid.
// However, this **might** have the nice side-effect of reducing the size of
// the minified code by reducing x.call() to merely x()
// See Mark Miller’s explanation of what this does.
// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming
var call = Function.call;
function uncurryThis(f) {
    return function () {
        return call.apply(f, arguments);
    };
}
// This is equivalent, but slower:
// uncurryThis = Function_bind.bind(Function_bind.call);
// http://jsperf.com/uncurrythis

var array_slice = uncurryThis(Array.prototype.slice);

var array_reduce = uncurryThis(
    Array.prototype.reduce || function (callback, basis) {
        var index = 0,
            length = this.length;
        // concerning the initial value, if one is not provided
        if (arguments.length === 1) {
            // seek to the first value in the array, accounting
            // for the possibility that is is a sparse array
            do {
                if (index in this) {
                    basis = this[index++];
                    break;
                }
                if (++index >= length) {
                    throw new TypeError();
                }
            } while (1);
        }
        // reduce
        for (; index < length; index++) {
            // account for the possibility that the array is sparse
            if (index in this) {
                basis = callback(basis, this[index], index);
            }
        }
        return basis;
    }
);

var array_indexOf = uncurryThis(
    Array.prototype.indexOf || function (value) {
        // not a very good shim, but good enough for our one use of it
        for (var i = 0; i < this.length; i++) {
            if (this[i] === value) {
                return i;
            }
        }
        return -1;
    }
);

var array_map = uncurryThis(
    Array.prototype.map || function (callback, thisp) {
        var self = this;
        var collect = [];
        array_reduce(self, function (undefined, value, index) {
            collect.push(callback.call(thisp, value, index, self));
        }, void 0);
        return collect;
    }
);

var object_create = Object.create || function (prototype) {
    function Type() { }
    Type.prototype = prototype;
    return new Type();
};

var object_hasOwnProperty = uncurryThis(Object.prototype.hasOwnProperty);

var object_keys = Object.keys || function (object) {
    var keys = [];
    for (var key in object) {
        if (object_hasOwnProperty(object, key)) {
            keys.push(key);
        }
    }
    return keys;
};

var object_toString = uncurryThis(Object.prototype.toString);

function isObject(value) {
    return value === Object(value);
}

// generator related shims

// FIXME: Remove this function once ES6 generators are in SpiderMonkey.
function isStopIteration(exception) {
    return (
        object_toString(exception) === "[object StopIteration]" ||
        exception instanceof QReturnValue
    );
}

// FIXME: Remove this helper and Q.return once ES6 generators are in
// SpiderMonkey.
var QReturnValue;
if (typeof ReturnValue !== "undefined") {
    QReturnValue = ReturnValue;
} else {
    QReturnValue = function (value) {
        this.value = value;
    };
}

// long stack traces

var STACK_JUMP_SEPARATOR = "From previous event:";

function makeStackTraceLong(error, promise) {
    // If possible, transform the error stack trace by removing Node and Q
    // cruft, then concatenating with the stack trace of `promise`. See #57.
    if (hasStacks &&
        promise.stack &&
        typeof error === "object" &&
        error !== null &&
        error.stack &&
        error.stack.indexOf(STACK_JUMP_SEPARATOR) === -1
    ) {
        var stacks = [];
        for (var p = promise; !!p; p = p.source) {
            if (p.stack) {
                stacks.unshift(p.stack);
            }
        }
        stacks.unshift(error.stack);

        var concatedStacks = stacks.join("\n" + STACK_JUMP_SEPARATOR + "\n");
        error.stack = filterStackString(concatedStacks);
    }
}

function filterStackString(stackString) {
    var lines = stackString.split("\n");
    var desiredLines = [];
    for (var i = 0; i < lines.length; ++i) {
        var line = lines[i];

        if (!isInternalFrame(line) && !isNodeFrame(line) && line) {
            desiredLines.push(line);
        }
    }
    return desiredLines.join("\n");
}

function isNodeFrame(stackLine) {
    return stackLine.indexOf("(module.js:") !== -1 ||
           stackLine.indexOf("(node.js:") !== -1;
}

function getFileNameAndLineNumber(stackLine) {
    // Named functions: "at functionName (filename:lineNumber:columnNumber)"
    // In IE10 function name can have spaces ("Anonymous function") O_o
    var attempt1 = /at .+ \((.+):(\d+):(?:\d+)\)$/.exec(stackLine);
    if (attempt1) {
        return [attempt1[1], Number(attempt1[2])];
    }

    // Anonymous functions: "at filename:lineNumber:columnNumber"
    var attempt2 = /at ([^ ]+):(\d+):(?:\d+)$/.exec(stackLine);
    if (attempt2) {
        return [attempt2[1], Number(attempt2[2])];
    }

    // Firefox style: "function@filename:lineNumber or @filename:lineNumber"
    var attempt3 = /.*@(.+):(\d+)$/.exec(stackLine);
    if (attempt3) {
        return [attempt3[1], Number(attempt3[2])];
    }
}

function isInternalFrame(stackLine) {
    var fileNameAndLineNumber = getFileNameAndLineNumber(stackLine);

    if (!fileNameAndLineNumber) {
        return false;
    }

    var fileName = fileNameAndLineNumber[0];
    var lineNumber = fileNameAndLineNumber[1];

    return fileName === qFileName &&
        lineNumber >= qStartingLine &&
        lineNumber <= qEndingLine;
}

// discover own file name and line number range for filtering stack
// traces
function captureLine() {
    if (!hasStacks) {
        return;
    }

    try {
        throw new Error();
    } catch (e) {
        var lines = e.stack.split("\n");
        var firstLine = lines[0].indexOf("@") > 0 ? lines[1] : lines[2];
        var fileNameAndLineNumber = getFileNameAndLineNumber(firstLine);
        if (!fileNameAndLineNumber) {
            return;
        }

        qFileName = fileNameAndLineNumber[0];
        return fileNameAndLineNumber[1];
    }
}

function deprecate(callback, name, alternative) {
    return function () {
        if (typeof console !== "undefined" &&
            typeof console.warn === "function") {
            console.warn(name + " is deprecated, use " + alternative +
                         " instead.", new Error("").stack);
        }
        return callback.apply(callback, arguments);
    };
}

// end of shims
// beginning of real work

/**
 * Constructs a promise for an immediate reference, passes promises through, or
 * coerces promises from different systems.
 * @param value immediate reference or promise
 */
function Q(value) {
    // If the object is already a Promise, return it directly.  This enables
    // the resolve function to both be used to created references from objects,
    // but to tolerably coerce non-promises to promises.
    if (value instanceof Promise) {
        return value;
    }

    // assimilate thenables
    if (isPromiseAlike(value)) {
        return coerce(value);
    } else {
        return fulfill(value);
    }
}
Q.resolve = Q;

/**
 * Performs a task in a future turn of the event loop.
 * @param {Function} task
 */
Q.nextTick = nextTick;

/**
 * Controls whether or not long stack traces will be on
 */
Q.longStackSupport = false;

// enable long stacks if Q_DEBUG is set
if (typeof process === "object" && process && process.env && process.env.Q_DEBUG) {
    Q.longStackSupport = true;
}

/**
 * Constructs a {promise, resolve, reject} object.
 *
 * `resolve` is a callback to invoke with a more resolved value for the
 * promise. To fulfill the promise, invoke `resolve` with any value that is
 * not a thenable. To reject the promise, invoke `resolve` with a rejected
 * thenable, or invoke `reject` with the reason directly. To resolve the
 * promise to another thenable, thus putting it in the same state, invoke
 * `resolve` with that other thenable.
 */
Q.defer = defer;
function defer() {
    // if "messages" is an "Array", that indicates that the promise has not yet
    // been resolved.  If it is "undefined", it has been resolved.  Each
    // element of the messages array is itself an array of complete arguments to
    // forward to the resolved promise.  We coerce the resolution value to a
    // promise using the `resolve` function because it handles both fully
    // non-thenable values and other thenables gracefully.
    var messages = [], progressListeners = [], resolvedPromise;

    var deferred = object_create(defer.prototype);
    var promise = object_create(Promise.prototype);

    promise.promiseDispatch = function (resolve, op, operands) {
        var args = array_slice(arguments);
        if (messages) {
            messages.push(args);
            if (op === "when" && operands[1]) { // progress operand
                progressListeners.push(operands[1]);
            }
        } else {
            Q.nextTick(function () {
                resolvedPromise.promiseDispatch.apply(resolvedPromise, args);
            });
        }
    };

    // XXX deprecated
    promise.valueOf = function () {
        if (messages) {
            return promise;
        }
        var nearerValue = nearer(resolvedPromise);
        if (isPromise(nearerValue)) {
            resolvedPromise = nearerValue; // shorten chain
        }
        return nearerValue;
    };

    promise.inspect = function () {
        if (!resolvedPromise) {
            return { state: "pending" };
        }
        return resolvedPromise.inspect();
    };

    if (Q.longStackSupport && hasStacks) {
        try {
            throw new Error();
        } catch (e) {
            // NOTE: don't try to use `Error.captureStackTrace` or transfer the
            // accessor around; that causes memory leaks as per GH-111. Just
            // reify the stack trace as a string ASAP.
            //
            // At the same time, cut off the first line; it's always just
            // "[object Promise]\n", as per the `toString`.
            promise.stack = e.stack.substring(e.stack.indexOf("\n") + 1);
        }
    }

    // NOTE: we do the checks for `resolvedPromise` in each method, instead of
    // consolidating them into `become`, since otherwise we'd create new
    // promises with the lines `become(whatever(value))`. See e.g. GH-252.

    function become(newPromise) {
        resolvedPromise = newPromise;
        promise.source = newPromise;

        array_reduce(messages, function (undefined, message) {
            Q.nextTick(function () {
                newPromise.promiseDispatch.apply(newPromise, message);
            });
        }, void 0);

        messages = void 0;
        progressListeners = void 0;
    }

    deferred.promise = promise;
    deferred.resolve = function (value) {
        if (resolvedPromise) {
            return;
        }

        become(Q(value));
    };

    deferred.fulfill = function (value) {
        if (resolvedPromise) {
            return;
        }

        become(fulfill(value));
    };
    deferred.reject = function (reason) {
        if (resolvedPromise) {
            return;
        }

        become(reject(reason));
    };
    deferred.notify = function (progress) {
        if (resolvedPromise) {
            return;
        }

        array_reduce(progressListeners, function (undefined, progressListener) {
            Q.nextTick(function () {
                progressListener(progress);
            });
        }, void 0);
    };

    return deferred;
}

/**
 * Creates a Node-style callback that will resolve or reject the deferred
 * promise.
 * @returns a nodeback
 */
defer.prototype.makeNodeResolver = function () {
    var self = this;
    return function (error, value) {
        if (error) {
            self.reject(error);
        } else if (arguments.length > 2) {
            self.resolve(array_slice(arguments, 1));
        } else {
            self.resolve(value);
        }
    };
};

/**
 * @param resolver {Function} a function that returns nothing and accepts
 * the resolve, reject, and notify functions for a deferred.
 * @returns a promise that may be resolved with the given resolve and reject
 * functions, or rejected by a thrown exception in resolver
 */
Q.Promise = promise; // ES6
Q.promise = promise;
function promise(resolver) {
    if (typeof resolver !== "function") {
        throw new TypeError("resolver must be a function.");
    }
    var deferred = defer();
    try {
        resolver(deferred.resolve, deferred.reject, deferred.notify);
    } catch (reason) {
        deferred.reject(reason);
    }
    return deferred.promise;
}

promise.race = race; // ES6
promise.all = all; // ES6
promise.reject = reject; // ES6
promise.resolve = Q; // ES6

// XXX experimental.  This method is a way to denote that a local value is
// serializable and should be immediately dispatched to a remote upon request,
// instead of passing a reference.
Q.passByCopy = function (object) {
    //freeze(object);
    //passByCopies.set(object, true);
    return object;
};

Promise.prototype.passByCopy = function () {
    //freeze(object);
    //passByCopies.set(object, true);
    return this;
};

/**
 * If two promises eventually fulfill to the same value, promises that value,
 * but otherwise rejects.
 * @param x {Any*}
 * @param y {Any*}
 * @returns {Any*} a promise for x and y if they are the same, but a rejection
 * otherwise.
 *
 */
Q.join = function (x, y) {
    return Q(x).join(y);
};

Promise.prototype.join = function (that) {
    return Q([this, that]).spread(function (x, y) {
        if (x === y) {
            // TODO: "===" should be Object.is or equiv
            return x;
        } else {
            throw new Error("Can't join: not the same: " + x + " " + y);
        }
    });
};

/**
 * Returns a promise for the first of an array of promises to become settled.
 * @param answers {Array[Any*]} promises to race
 * @returns {Any*} the first promise to be settled
 */
Q.race = race;
function race(answerPs) {
    return promise(function (resolve, reject) {
        // Switch to this once we can assume at least ES5
        // answerPs.forEach(function (answerP) {
        //     Q(answerP).then(resolve, reject);
        // });
        // Use this in the meantime
        for (var i = 0, len = answerPs.length; i < len; i++) {
            Q(answerPs[i]).then(resolve, reject);
        }
    });
}

Promise.prototype.race = function () {
    return this.then(Q.race);
};

/**
 * Constructs a Promise with a promise descriptor object and optional fallback
 * function.  The descriptor contains methods like when(rejected), get(name),
 * set(name, value), post(name, args), and delete(name), which all
 * return either a value, a promise for a value, or a rejection.  The fallback
 * accepts the operation name, a resolver, and any further arguments that would
 * have been forwarded to the appropriate method above had a method been
 * provided with the proper name.  The API makes no guarantees about the nature
 * of the returned object, apart from that it is usable whereever promises are
 * bought and sold.
 */
Q.makePromise = Promise;
function Promise(descriptor, fallback, inspect) {
    if (fallback === void 0) {
        fallback = function (op) {
            return reject(new Error(
                "Promise does not support operation: " + op
            ));
        };
    }
    if (inspect === void 0) {
        inspect = function () {
            return {state: "unknown"};
        };
    }

    var promise = object_create(Promise.prototype);

    promise.promiseDispatch = function (resolve, op, args) {
        var result;
        try {
            if (descriptor[op]) {
                result = descriptor[op].apply(promise, args);
            } else {
                result = fallback.call(promise, op, args);
            }
        } catch (exception) {
            result = reject(exception);
        }
        if (resolve) {
            resolve(result);
        }
    };

    promise.inspect = inspect;

    // XXX deprecated `valueOf` and `exception` support
    if (inspect) {
        var inspected = inspect();
        if (inspected.state === "rejected") {
            promise.exception = inspected.reason;
        }

        promise.valueOf = function () {
            var inspected = inspect();
            if (inspected.state === "pending" ||
                inspected.state === "rejected") {
                return promise;
            }
            return inspected.value;
        };
    }

    return promise;
}

Promise.prototype.toString = function () {
    return "[object Promise]";
};

Promise.prototype.then = function (fulfilled, rejected, progressed) {
    var self = this;
    var deferred = defer();
    var done = false;   // ensure the untrusted promise makes at most a
                        // single call to one of the callbacks

    function _fulfilled(value) {
        try {
            return typeof fulfilled === "function" ? fulfilled(value) : value;
        } catch (exception) {
            return reject(exception);
        }
    }

    function _rejected(exception) {
        if (typeof rejected === "function") {
            makeStackTraceLong(exception, self);
            try {
                return rejected(exception);
            } catch (newException) {
                return reject(newException);
            }
        }
        return reject(exception);
    }

    function _progressed(value) {
        return typeof progressed === "function" ? progressed(value) : value;
    }

    Q.nextTick(function () {
        self.promiseDispatch(function (value) {
            if (done) {
                return;
            }
            done = true;

            deferred.resolve(_fulfilled(value));
        }, "when", [function (exception) {
            if (done) {
                return;
            }
            done = true;

            deferred.resolve(_rejected(exception));
        }]);
    });

    // Progress propagator need to be attached in the current tick.
    self.promiseDispatch(void 0, "when", [void 0, function (value) {
        var newValue;
        var threw = false;
        try {
            newValue = _progressed(value);
        } catch (e) {
            threw = true;
            if (Q.onerror) {
                Q.onerror(e);
            } else {
                throw e;
            }
        }

        if (!threw) {
            deferred.notify(newValue);
        }
    }]);

    return deferred.promise;
};

Q.tap = function (promise, callback) {
    return Q(promise).tap(callback);
};

/**
 * Works almost like "finally", but not called for rejections.
 * Original resolution value is passed through callback unaffected.
 * Callback may return a promise that will be awaited for.
 * @param {Function} callback
 * @returns {Q.Promise}
 * @example
 * doSomething()
 *   .then(...)
 *   .tap(console.log)
 *   .then(...);
 */
Promise.prototype.tap = function (callback) {
    callback = Q(callback);

    return this.then(function (value) {
        return callback.fcall(value).thenResolve(value);
    });
};

/**
 * Registers an observer on a promise.
 *
 * Guarantees:
 *
 * 1. that fulfilled and rejected will be called only once.
 * 2. that either the fulfilled callback or the rejected callback will be
 *    called, but not both.
 * 3. that fulfilled and rejected will not be called in this turn.
 *
 * @param value      promise or immediate reference to observe
 * @param fulfilled  function to be called with the fulfilled value
 * @param rejected   function to be called with the rejection exception
 * @param progressed function to be called on any progress notifications
 * @return promise for the return value from the invoked callback
 */
Q.when = when;
function when(value, fulfilled, rejected, progressed) {
    return Q(value).then(fulfilled, rejected, progressed);
}

Promise.prototype.thenResolve = function (value) {
    return this.then(function () { return value; });
};

Q.thenResolve = function (promise, value) {
    return Q(promise).thenResolve(value);
};

Promise.prototype.thenReject = function (reason) {
    return this.then(function () { throw reason; });
};

Q.thenReject = function (promise, reason) {
    return Q(promise).thenReject(reason);
};

/**
 * If an object is not a promise, it is as "near" as possible.
 * If a promise is rejected, it is as "near" as possible too.
 * If it’s a fulfilled promise, the fulfillment value is nearer.
 * If it’s a deferred promise and the deferred has been resolved, the
 * resolution is "nearer".
 * @param object
 * @returns most resolved (nearest) form of the object
 */

// XXX should we re-do this?
Q.nearer = nearer;
function nearer(value) {
    if (isPromise(value)) {
        var inspected = value.inspect();
        if (inspected.state === "fulfilled") {
            return inspected.value;
        }
    }
    return value;
}

/**
 * @returns whether the given object is a promise.
 * Otherwise it is a fulfilled value.
 */
Q.isPromise = isPromise;
function isPromise(object) {
    return object instanceof Promise;
}

Q.isPromiseAlike = isPromiseAlike;
function isPromiseAlike(object) {
    return isObject(object) && typeof object.then === "function";
}

/**
 * @returns whether the given object is a pending promise, meaning not
 * fulfilled or rejected.
 */
Q.isPending = isPending;
function isPending(object) {
    return isPromise(object) && object.inspect().state === "pending";
}

Promise.prototype.isPending = function () {
    return this.inspect().state === "pending";
};

/**
 * @returns whether the given object is a value or fulfilled
 * promise.
 */
Q.isFulfilled = isFulfilled;
function isFulfilled(object) {
    return !isPromise(object) || object.inspect().state === "fulfilled";
}

Promise.prototype.isFulfilled = function () {
    return this.inspect().state === "fulfilled";
};

/**
 * @returns whether the given object is a rejected promise.
 */
Q.isRejected = isRejected;
function isRejected(object) {
    return isPromise(object) && object.inspect().state === "rejected";
}

Promise.prototype.isRejected = function () {
    return this.inspect().state === "rejected";
};

//// BEGIN UNHANDLED REJECTION TRACKING

// This promise library consumes exceptions thrown in handlers so they can be
// handled by a subsequent promise.  The exceptions get added to this array when
// they are created, and removed when they are handled.  Note that in ES6 or
// shimmed environments, this would naturally be a `Set`.
var unhandledReasons = [];
var unhandledRejections = [];
var reportedUnhandledRejections = [];
var trackUnhandledRejections = true;

function resetUnhandledRejections() {
    unhandledReasons.length = 0;
    unhandledRejections.length = 0;

    if (!trackUnhandledRejections) {
        trackUnhandledRejections = true;
    }
}

function trackRejection(promise, reason) {
    if (!trackUnhandledRejections) {
        return;
    }
    if (typeof process === "object" && typeof process.emit === "function") {
        Q.nextTick.runAfter(function () {
            if (array_indexOf(unhandledRejections, promise) !== -1) {
                process.emit("unhandledRejection", reason, promise);
                reportedUnhandledRejections.push(promise);
            }
        });
    }

    unhandledRejections.push(promise);
    if (reason && typeof reason.stack !== "undefined") {
        unhandledReasons.push(reason.stack);
    } else {
        unhandledReasons.push("(no stack) " + reason);
    }
}

function untrackRejection(promise) {
    if (!trackUnhandledRejections) {
        return;
    }

    var at = array_indexOf(unhandledRejections, promise);
    if (at !== -1) {
        if (typeof process === "object" && typeof process.emit === "function") {
            Q.nextTick.runAfter(function () {
                var atReport = array_indexOf(reportedUnhandledRejections, promise);
                if (atReport !== -1) {
                    process.emit("rejectionHandled", unhandledReasons[at], promise);
                    reportedUnhandledRejections.splice(atReport, 1);
                }
            });
        }
        unhandledRejections.splice(at, 1);
        unhandledReasons.splice(at, 1);
    }
}

Q.resetUnhandledRejections = resetUnhandledRejections;

Q.getUnhandledReasons = function () {
    // Make a copy so that consumers can't interfere with our internal state.
    return unhandledReasons.slice();
};

Q.stopUnhandledRejectionTracking = function () {
    resetUnhandledRejections();
    trackUnhandledRejections = false;
};

resetUnhandledRejections();

//// END UNHANDLED REJECTION TRACKING

/**
 * Constructs a rejected promise.
 * @param reason value describing the failure
 */
Q.reject = reject;
function reject(reason) {
    var rejection = Promise({
        "when": function (rejected) {
            // note that the error has been handled
            if (rejected) {
                untrackRejection(this);
            }
            return rejected ? rejected(reason) : this;
        }
    }, function fallback() {
        return this;
    }, function inspect() {
        return { state: "rejected", reason: reason };
    });

    // Note that the reason has not been handled.
    trackRejection(rejection, reason);

    return rejection;
}

/**
 * Constructs a fulfilled promise for an immediate reference.
 * @param value immediate reference
 */
Q.fulfill = fulfill;
function fulfill(value) {
    return Promise({
        "when": function () {
            return value;
        },
        "get": function (name) {
            return value[name];
        },
        "set": function (name, rhs) {
            value[name] = rhs;
        },
        "delete": function (name) {
            delete value[name];
        },
        "post": function (name, args) {
            // Mark Miller proposes that post with no name should apply a
            // promised function.
            if (name === null || name === void 0) {
                return value.apply(void 0, args);
            } else {
                return value[name].apply(value, args);
            }
        },
        "apply": function (thisp, args) {
            return value.apply(thisp, args);
        },
        "keys": function () {
            return object_keys(value);
        }
    }, void 0, function inspect() {
        return { state: "fulfilled", value: value };
    });
}

/**
 * Converts thenables to Q promises.
 * @param promise thenable promise
 * @returns a Q promise
 */
function coerce(promise) {
    var deferred = defer();
    Q.nextTick(function () {
        try {
            promise.then(deferred.resolve, deferred.reject, deferred.notify);
        } catch (exception) {
            deferred.reject(exception);
        }
    });
    return deferred.promise;
}

/**
 * Annotates an object such that it will never be
 * transferred away from this process over any promise
 * communication channel.
 * @param object
 * @returns promise a wrapping of that object that
 * additionally responds to the "isDef" message
 * without a rejection.
 */
Q.master = master;
function master(object) {
    return Promise({
        "isDef": function () {}
    }, function fallback(op, args) {
        return dispatch(object, op, args);
    }, function () {
        return Q(object).inspect();
    });
}

/**
 * Spreads the values of a promised array of arguments into the
 * fulfillment callback.
 * @param fulfilled callback that receives variadic arguments from the
 * promised array
 * @param rejected callback that receives the exception if the promise
 * is rejected.
 * @returns a promise for the return value or thrown exception of
 * either callback.
 */
Q.spread = spread;
function spread(value, fulfilled, rejected) {
    return Q(value).spread(fulfilled, rejected);
}

Promise.prototype.spread = function (fulfilled, rejected) {
    return this.all().then(function (array) {
        return fulfilled.apply(void 0, array);
    }, rejected);
};

/**
 * The async function is a decorator for generator functions, turning
 * them into asynchronous generators.  Although generators are only part
 * of the newest ECMAScript 6 drafts, this code does not cause syntax
 * errors in older engines.  This code should continue to work and will
 * in fact improve over time as the language improves.
 *
 * ES6 generators are currently part of V8 version 3.19 with the
 * --harmony-generators runtime flag enabled.  SpiderMonkey has had them
 * for longer, but under an older Python-inspired form.  This function
 * works on both kinds of generators.
 *
 * Decorates a generator function such that:
 *  - it may yield promises
 *  - execution will continue when that promise is fulfilled
 *  - the value of the yield expression will be the fulfilled value
 *  - it returns a promise for the return value (when the generator
 *    stops iterating)
 *  - the decorated function returns a promise for the return value
 *    of the generator or the first rejected promise among those
 *    yielded.
 *  - if an error is thrown in the generator, it propagates through
 *    every following yield until it is caught, or until it escapes
 *    the generator function altogether, and is translated into a
 *    rejection for the promise returned by the decorated generator.
 */
Q.async = async;
function async(makeGenerator) {
    return function () {
        // when verb is "send", arg is a value
        // when verb is "throw", arg is an exception
        function continuer(verb, arg) {
            var result;

            // Until V8 3.19 / Chromium 29 is released, SpiderMonkey is the only
            // engine that has a deployed base of browsers that support generators.
            // However, SM's generators use the Python-inspired semantics of
            // outdated ES6 drafts.  We would like to support ES6, but we'd also
            // like to make it possible to use generators in deployed browsers, so
            // we also support Python-style generators.  At some point we can remove
            // this block.

            if (typeof StopIteration === "undefined") {
                // ES6 Generators
                try {
                    result = generator[verb](arg);
                } catch (exception) {
                    return reject(exception);
                }
                if (result.done) {
                    return Q(result.value);
                } else {
                    return when(result.value, callback, errback);
                }
            } else {
                // SpiderMonkey Generators
                // FIXME: Remove this case when SM does ES6 generators.
                try {
                    result = generator[verb](arg);
                } catch (exception) {
                    if (isStopIteration(exception)) {
                        return Q(exception.value);
                    } else {
                        return reject(exception);
                    }
                }
                return when(result, callback, errback);
            }
        }
        var generator = makeGenerator.apply(this, arguments);
        var callback = continuer.bind(continuer, "next");
        var errback = continuer.bind(continuer, "throw");
        return callback();
    };
}

/**
 * The spawn function is a small wrapper around async that immediately
 * calls the generator and also ends the promise chain, so that any
 * unhandled errors are thrown instead of forwarded to the error
 * handler. This is useful because it's extremely common to run
 * generators at the top-level to work with libraries.
 */
Q.spawn = spawn;
function spawn(makeGenerator) {
    Q.done(Q.async(makeGenerator)());
}

// FIXME: Remove this interface once ES6 generators are in SpiderMonkey.
/**
 * Throws a ReturnValue exception to stop an asynchronous generator.
 *
 * This interface is a stop-gap measure to support generator return
 * values in older Firefox/SpiderMonkey.  In browsers that support ES6
 * generators like Chromium 29, just use "return" in your generator
 * functions.
 *
 * @param value the return value for the surrounding generator
 * @throws ReturnValue exception with the value.
 * @example
 * // ES6 style
 * Q.async(function* () {
 *      var foo = yield getFooPromise();
 *      var bar = yield getBarPromise();
 *      return foo + bar;
 * })
 * // Older SpiderMonkey style
 * Q.async(function () {
 *      var foo = yield getFooPromise();
 *      var bar = yield getBarPromise();
 *      Q.return(foo + bar);
 * })
 */
Q["return"] = _return;
function _return(value) {
    throw new QReturnValue(value);
}

/**
 * The promised function decorator ensures that any promise arguments
 * are settled and passed as values (`this` is also settled and passed
 * as a value).  It will also ensure that the result of a function is
 * always a promise.
 *
 * @example
 * var add = Q.promised(function (a, b) {
 *     return a + b;
 * });
 * add(Q(a), Q(B));
 *
 * @param {function} callback The function to decorate
 * @returns {function} a function that has been decorated.
 */
Q.promised = promised;
function promised(callback) {
    return function () {
        return spread([this, all(arguments)], function (self, args) {
            return callback.apply(self, args);
        });
    };
}

/**
 * sends a message to a value in a future turn
 * @param object* the recipient
 * @param op the name of the message operation, e.g., "when",
 * @param args further arguments to be forwarded to the operation
 * @returns result {Promise} a promise for the result of the operation
 */
Q.dispatch = dispatch;
function dispatch(object, op, args) {
    return Q(object).dispatch(op, args);
}

Promise.prototype.dispatch = function (op, args) {
    var self = this;
    var deferred = defer();
    Q.nextTick(function () {
        self.promiseDispatch(deferred.resolve, op, args);
    });
    return deferred.promise;
};

/**
 * Gets the value of a property in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of property to get
 * @return promise for the property value
 */
Q.get = function (object, key) {
    return Q(object).dispatch("get", [key]);
};

Promise.prototype.get = function (key) {
    return this.dispatch("get", [key]);
};

/**
 * Sets the value of a property in a future turn.
 * @param object    promise or immediate reference for object object
 * @param name      name of property to set
 * @param value     new value of property
 * @return promise for the return value
 */
Q.set = function (object, key, value) {
    return Q(object).dispatch("set", [key, value]);
};

Promise.prototype.set = function (key, value) {
    return this.dispatch("set", [key, value]);
};

/**
 * Deletes a property in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of property to delete
 * @return promise for the return value
 */
Q.del = // XXX legacy
Q["delete"] = function (object, key) {
    return Q(object).dispatch("delete", [key]);
};

Promise.prototype.del = // XXX legacy
Promise.prototype["delete"] = function (key) {
    return this.dispatch("delete", [key]);
};

/**
 * Invokes a method in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of method to invoke
 * @param value     a value to post, typically an array of
 *                  invocation arguments for promises that
 *                  are ultimately backed with `resolve` values,
 *                  as opposed to those backed with URLs
 *                  wherein the posted value can be any
 *                  JSON serializable object.
 * @return promise for the return value
 */
// bound locally because it is used by other methods
Q.mapply = // XXX As proposed by "Redsandro"
Q.post = function (object, name, args) {
    return Q(object).dispatch("post", [name, args]);
};

Promise.prototype.mapply = // XXX As proposed by "Redsandro"
Promise.prototype.post = function (name, args) {
    return this.dispatch("post", [name, args]);
};

/**
 * Invokes a method in a future turn.
 * @param object    promise or immediate reference for target object
 * @param name      name of method to invoke
 * @param ...args   array of invocation arguments
 * @return promise for the return value
 */
Q.send = // XXX Mark Miller's proposed parlance
Q.mcall = // XXX As proposed by "Redsandro"
Q.invoke = function (object, name /*...args*/) {
    return Q(object).dispatch("post", [name, array_slice(arguments, 2)]);
};

Promise.prototype.send = // XXX Mark Miller's proposed parlance
Promise.prototype.mcall = // XXX As proposed by "Redsandro"
Promise.prototype.invoke = function (name /*...args*/) {
    return this.dispatch("post", [name, array_slice(arguments, 1)]);
};

/**
 * Applies the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param args      array of application arguments
 */
Q.fapply = function (object, args) {
    return Q(object).dispatch("apply", [void 0, args]);
};

Promise.prototype.fapply = function (args) {
    return this.dispatch("apply", [void 0, args]);
};

/**
 * Calls the promised function in a future turn.
 * @param object    promise or immediate reference for target function
 * @param ...args   array of application arguments
 */
Q["try"] =
Q.fcall = function (object /* ...args*/) {
    return Q(object).dispatch("apply", [void 0, array_slice(arguments, 1)]);
};

Promise.prototype.fcall = function (/*...args*/) {
    return this.dispatch("apply", [void 0, array_slice(arguments)]);
};

/**
 * Binds the promised function, transforming return values into a fulfilled
 * promise and thrown errors into a rejected one.
 * @param object    promise or immediate reference for target function
 * @param ...args   array of application arguments
 */
Q.fbind = function (object /*...args*/) {
    var promise = Q(object);
    var args = array_slice(arguments, 1);
    return function fbound() {
        return promise.dispatch("apply", [
            this,
            args.concat(array_slice(arguments))
        ]);
    };
};
Promise.prototype.fbind = function (/*...args*/) {
    var promise = this;
    var args = array_slice(arguments);
    return function fbound() {
        return promise.dispatch("apply", [
            this,
            args.concat(array_slice(arguments))
        ]);
    };
};

/**
 * Requests the names of the owned properties of a promised
 * object in a future turn.
 * @param object    promise or immediate reference for target object
 * @return promise for the keys of the eventually settled object
 */
Q.keys = function (object) {
    return Q(object).dispatch("keys", []);
};

Promise.prototype.keys = function () {
    return this.dispatch("keys", []);
};

/**
 * Turns an array of promises into a promise for an array.  If any of
 * the promises gets rejected, the whole array is rejected immediately.
 * @param {Array*} an array (or promise for an array) of values (or
 * promises for values)
 * @returns a promise for an array of the corresponding values
 */
// By Mark Miller
// http://wiki.ecmascript.org/doku.php?id=strawman:concurrency&rev=1308776521#allfulfilled
Q.all = all;
function all(promises) {
    return when(promises, function (promises) {
        var pendingCount = 0;
        var deferred = defer();
        array_reduce(promises, function (undefined, promise, index) {
            var snapshot;
            if (
                isPromise(promise) &&
                (snapshot = promise.inspect()).state === "fulfilled"
            ) {
                promises[index] = snapshot.value;
            } else {
                ++pendingCount;
                when(
                    promise,
                    function (value) {
                        promises[index] = value;
                        if (--pendingCount === 0) {
                            deferred.resolve(promises);
                        }
                    },
                    deferred.reject,
                    function (progress) {
                        deferred.notify({ index: index, value: progress });
                    }
                );
            }
        }, void 0);
        if (pendingCount === 0) {
            deferred.resolve(promises);
        }
        return deferred.promise;
    });
}

Promise.prototype.all = function () {
    return all(this);
};

/**
 * Returns the first resolved promise of an array. Prior rejected promises are
 * ignored.  Rejects only if all promises are rejected.
 * @param {Array*} an array containing values or promises for values
 * @returns a promise fulfilled with the value of the first resolved promise,
 * or a rejected promise if all promises are rejected.
 */
Q.any = any;

function any(promises) {
    if (promises.length === 0) {
        return Q.resolve();
    }

    var deferred = Q.defer();
    var pendingCount = 0;
    array_reduce(promises, function (prev, current, index) {
        var promise = promises[index];

        pendingCount++;

        when(promise, onFulfilled, onRejected, onProgress);
        function onFulfilled(result) {
            deferred.resolve(result);
        }
        function onRejected() {
            pendingCount--;
            if (pendingCount === 0) {
                deferred.reject(new Error(
                    "Can't get fulfillment value from any promise, all " +
                    "promises were rejected."
                ));
            }
        }
        function onProgress(progress) {
            deferred.notify({
                index: index,
                value: progress
            });
        }
    }, undefined);

    return deferred.promise;
}

Promise.prototype.any = function () {
    return any(this);
};

/**
 * Waits for all promises to be settled, either fulfilled or
 * rejected.  This is distinct from `all` since that would stop
 * waiting at the first rejection.  The promise returned by
 * `allResolved` will never be rejected.
 * @param promises a promise for an array (or an array) of promises
 * (or values)
 * @return a promise for an array of promises
 */
Q.allResolved = deprecate(allResolved, "allResolved", "allSettled");
function allResolved(promises) {
    return when(promises, function (promises) {
        promises = array_map(promises, Q);
        return when(all(array_map(promises, function (promise) {
            return when(promise, noop, noop);
        })), function () {
            return promises;
        });
    });
}

Promise.prototype.allResolved = function () {
    return allResolved(this);
};

/**
 * @see Promise#allSettled
 */
Q.allSettled = allSettled;
function allSettled(promises) {
    return Q(promises).allSettled();
}

/**
 * Turns an array of promises into a promise for an array of their states (as
 * returned by `inspect`) when they have all settled.
 * @param {Array[Any*]} values an array (or promise for an array) of values (or
 * promises for values)
 * @returns {Array[State]} an array of states for the respective values.
 */
Promise.prototype.allSettled = function () {
    return this.then(function (promises) {
        return all(array_map(promises, function (promise) {
            promise = Q(promise);
            function regardless() {
                return promise.inspect();
            }
            return promise.then(regardless, regardless);
        }));
    });
};

/**
 * Captures the failure of a promise, giving an oportunity to recover
 * with a callback.  If the given promise is fulfilled, the returned
 * promise is fulfilled.
 * @param {Any*} promise for something
 * @param {Function} callback to fulfill the returned promise if the
 * given promise is rejected
 * @returns a promise for the return value of the callback
 */
Q.fail = // XXX legacy
Q["catch"] = function (object, rejected) {
    return Q(object).then(void 0, rejected);
};

Promise.prototype.fail = // XXX legacy
Promise.prototype["catch"] = function (rejected) {
    return this.then(void 0, rejected);
};

/**
 * Attaches a listener that can respond to progress notifications from a
 * promise's originating deferred. This listener receives the exact arguments
 * passed to ``deferred.notify``.
 * @param {Any*} promise for something
 * @param {Function} callback to receive any progress notifications
 * @returns the given promise, unchanged
 */
Q.progress = progress;
function progress(object, progressed) {
    return Q(object).then(void 0, void 0, progressed);
}

Promise.prototype.progress = function (progressed) {
    return this.then(void 0, void 0, progressed);
};

/**
 * Provides an opportunity to observe the settling of a promise,
 * regardless of whether the promise is fulfilled or rejected.  Forwards
 * the resolution to the returned promise when the callback is done.
 * The callback can return a promise to defer completion.
 * @param {Any*} promise
 * @param {Function} callback to observe the resolution of the given
 * promise, takes no arguments.
 * @returns a promise for the resolution of the given promise when
 * ``fin`` is done.
 */
Q.fin = // XXX legacy
Q["finally"] = function (object, callback) {
    return Q(object)["finally"](callback);
};

Promise.prototype.fin = // XXX legacy
Promise.prototype["finally"] = function (callback) {
    callback = Q(callback);
    return this.then(function (value) {
        return callback.fcall().then(function () {
            return value;
        });
    }, function (reason) {
        // TODO attempt to recycle the rejection with "this".
        return callback.fcall().then(function () {
            throw reason;
        });
    });
};

/**
 * Terminates a chain of promises, forcing rejections to be
 * thrown as exceptions.
 * @param {Any*} promise at the end of a chain of promises
 * @returns nothing
 */
Q.done = function (object, fulfilled, rejected, progress) {
    return Q(object).done(fulfilled, rejected, progress);
};

Promise.prototype.done = function (fulfilled, rejected, progress) {
    var onUnhandledError = function (error) {
        // forward to a future turn so that ``when``
        // does not catch it and turn it into a rejection.
        Q.nextTick(function () {
            makeStackTraceLong(error, promise);
            if (Q.onerror) {
                Q.onerror(error);
            } else {
                throw error;
            }
        });
    };

    // Avoid unnecessary `nextTick`ing via an unnecessary `when`.
    var promise = fulfilled || rejected || progress ?
        this.then(fulfilled, rejected, progress) :
        this;

    if (typeof process === "object" && process && process.domain) {
        onUnhandledError = process.domain.bind(onUnhandledError);
    }

    promise.then(void 0, onUnhandledError);
};

/**
 * Causes a promise to be rejected if it does not get fulfilled before
 * some milliseconds time out.
 * @param {Any*} promise
 * @param {Number} milliseconds timeout
 * @param {Any*} custom error message or Error object (optional)
 * @returns a promise for the resolution of the given promise if it is
 * fulfilled before the timeout, otherwise rejected.
 */
Q.timeout = function (object, ms, error) {
    return Q(object).timeout(ms, error);
};

Promise.prototype.timeout = function (ms, error) {
    var deferred = defer();
    var timeoutId = setTimeout(function () {
        if (!error || "string" === typeof error) {
            error = new Error(error || "Timed out after " + ms + " ms");
            error.code = "ETIMEDOUT";
        }
        deferred.reject(error);
    }, ms);

    this.then(function (value) {
        clearTimeout(timeoutId);
        deferred.resolve(value);
    }, function (exception) {
        clearTimeout(timeoutId);
        deferred.reject(exception);
    }, deferred.notify);

    return deferred.promise;
};

/**
 * Returns a promise for the given value (or promised value), some
 * milliseconds after it resolved. Passes rejections immediately.
 * @param {Any*} promise
 * @param {Number} milliseconds
 * @returns a promise for the resolution of the given promise after milliseconds
 * time has elapsed since the resolution of the given promise.
 * If the given promise rejects, that is passed immediately.
 */
Q.delay = function (object, timeout) {
    if (timeout === void 0) {
        timeout = object;
        object = void 0;
    }
    return Q(object).delay(timeout);
};

Promise.prototype.delay = function (timeout) {
    return this.then(function (value) {
        var deferred = defer();
        setTimeout(function () {
            deferred.resolve(value);
        }, timeout);
        return deferred.promise;
    });
};

/**
 * Passes a continuation to a Node function, which is called with the given
 * arguments provided as an array, and returns a promise.
 *
 *      Q.nfapply(FS.readFile, [__filename])
 *      .then(function (content) {
 *      })
 *
 */
Q.nfapply = function (callback, args) {
    return Q(callback).nfapply(args);
};

Promise.prototype.nfapply = function (args) {
    var deferred = defer();
    var nodeArgs = array_slice(args);
    nodeArgs.push(deferred.makeNodeResolver());
    this.fapply(nodeArgs).fail(deferred.reject);
    return deferred.promise;
};

/**
 * Passes a continuation to a Node function, which is called with the given
 * arguments provided individually, and returns a promise.
 * @example
 * Q.nfcall(FS.readFile, __filename)
 * .then(function (content) {
 * })
 *
 */
Q.nfcall = function (callback /*...args*/) {
    var args = array_slice(arguments, 1);
    return Q(callback).nfapply(args);
};

Promise.prototype.nfcall = function (/*...args*/) {
    var nodeArgs = array_slice(arguments);
    var deferred = defer();
    nodeArgs.push(deferred.makeNodeResolver());
    this.fapply(nodeArgs).fail(deferred.reject);
    return deferred.promise;
};

/**
 * Wraps a NodeJS continuation passing function and returns an equivalent
 * version that returns a promise.
 * @example
 * Q.nfbind(FS.readFile, __filename)("utf-8")
 * .then(console.log)
 * .done()
 */
Q.nfbind =
Q.denodeify = function (callback /*...args*/) {
    var baseArgs = array_slice(arguments, 1);
    return function () {
        var nodeArgs = baseArgs.concat(array_slice(arguments));
        var deferred = defer();
        nodeArgs.push(deferred.makeNodeResolver());
        Q(callback).fapply(nodeArgs).fail(deferred.reject);
        return deferred.promise;
    };
};

Promise.prototype.nfbind =
Promise.prototype.denodeify = function (/*...args*/) {
    var args = array_slice(arguments);
    args.unshift(this);
    return Q.denodeify.apply(void 0, args);
};

Q.nbind = function (callback, thisp /*...args*/) {
    var baseArgs = array_slice(arguments, 2);
    return function () {
        var nodeArgs = baseArgs.concat(array_slice(arguments));
        var deferred = defer();
        nodeArgs.push(deferred.makeNodeResolver());
        function bound() {
            return callback.apply(thisp, arguments);
        }
        Q(bound).fapply(nodeArgs).fail(deferred.reject);
        return deferred.promise;
    };
};

Promise.prototype.nbind = function (/*thisp, ...args*/) {
    var args = array_slice(arguments, 0);
    args.unshift(this);
    return Q.nbind.apply(void 0, args);
};

/**
 * Calls a method of a Node-style object that accepts a Node-style
 * callback with a given array of arguments, plus a provided callback.
 * @param object an object that has the named method
 * @param {String} name name of the method of object
 * @param {Array} args arguments to pass to the method; the callback
 * will be provided by Q and appended to these arguments.
 * @returns a promise for the value or error
 */
Q.nmapply = // XXX As proposed by "Redsandro"
Q.npost = function (object, name, args) {
    return Q(object).npost(name, args);
};

Promise.prototype.nmapply = // XXX As proposed by "Redsandro"
Promise.prototype.npost = function (name, args) {
    var nodeArgs = array_slice(args || []);
    var deferred = defer();
    nodeArgs.push(deferred.makeNodeResolver());
    this.dispatch("post", [name, nodeArgs]).fail(deferred.reject);
    return deferred.promise;
};

/**
 * Calls a method of a Node-style object that accepts a Node-style
 * callback, forwarding the given variadic arguments, plus a provided
 * callback argument.
 * @param object an object that has the named method
 * @param {String} name name of the method of object
 * @param ...args arguments to pass to the method; the callback will
 * be provided by Q and appended to these arguments.
 * @returns a promise for the value or error
 */
Q.nsend = // XXX Based on Mark Miller's proposed "send"
Q.nmcall = // XXX Based on "Redsandro's" proposal
Q.ninvoke = function (object, name /*...args*/) {
    var nodeArgs = array_slice(arguments, 2);
    var deferred = defer();
    nodeArgs.push(deferred.makeNodeResolver());
    Q(object).dispatch("post", [name, nodeArgs]).fail(deferred.reject);
    return deferred.promise;
};

Promise.prototype.nsend = // XXX Based on Mark Miller's proposed "send"
Promise.prototype.nmcall = // XXX Based on "Redsandro's" proposal
Promise.prototype.ninvoke = function (name /*...args*/) {
    var nodeArgs = array_slice(arguments, 1);
    var deferred = defer();
    nodeArgs.push(deferred.makeNodeResolver());
    this.dispatch("post", [name, nodeArgs]).fail(deferred.reject);
    return deferred.promise;
};

/**
 * If a function would like to support both Node continuation-passing-style and
 * promise-returning-style, it can end its internal promise chain with
 * `nodeify(nodeback)`, forwarding the optional nodeback argument.  If the user
 * elects to use a nodeback, the result will be sent there.  If they do not
 * pass a nodeback, they will receive the result promise.
 * @param object a result (or a promise for a result)
 * @param {Function} nodeback a Node.js-style callback
 * @returns either the promise or nothing
 */
Q.nodeify = nodeify;
function nodeify(object, nodeback) {
    return Q(object).nodeify(nodeback);
}

Promise.prototype.nodeify = function (nodeback) {
    if (nodeback) {
        this.then(function (value) {
            Q.nextTick(function () {
                nodeback(null, value);
            });
        }, function (error) {
            Q.nextTick(function () {
                nodeback(error);
            });
        });
    } else {
        return this;
    }
};

Q.noConflict = function() {
    throw new Error("Q.noConflict only works when Q is used as a global");
};

// All code before this point will be filtered from stack traces.
var qEndingLine = captureLine();

return Q;

});

}).call(this,_dereq_('_process'))

},{"_process":38}],2:[function(_dereq_,module,exports){
var work = _dereq_('webworkify');
var tojson = _dereq_('ngraph.tojson');
var eventify = _dereq_('ngraph.events');

var createLayout = _dereq_('./lib/createLayout.js');
var validateOptions = _dereq_('./options.js');
var messageKind = _dereq_('./lib/messages.js');

module.exports = createAsyncLayout;

function createAsyncLayout(graph, options) {
  options = validateOptions(options);

  var assignPosition = options.is3d ? assignPosition3d : assignPosition2d;

  var pendingInitialization = false;
  var initRequestSent = false;
  var systemStable = false;
  var graphRect;
  var pinStatus = Object.create(null);
  var linkPositions;

  // Since this is fairly common message, there is no need to recreate it every time:
  var stepMessage = { kind: messageKind.step };

  var positions = Object.create(null);

  var layoutWorker = work(_dereq_('./lib/layoutWorker.js'));
  layoutWorker.addEventListener('message', handleMessageFromWorker);

  initWorker();
  initPositions();

  var api = {
    /**
     * Request to perform one iteration of force layout. The request is
     * forwarded to web worker
     *
     * @returns {boolean} true if system is considered stable; false otherwise.
     */
    step: asyncStep,

    /**
     * Gets the last known position of a given node by its identifier.
     *
     * @param {string} nodeId identifier of a node in question.
     * @returns {object} {x: number, y: number, z: number} coordinates of a node.
     */
    getNodePosition: getNodePosition,

    /**
     * Gets the last known position of a given link by its identifier.
     *
     * @param {string} linkId identifier of a link in question.
     * @returns {Object} Link position by link id
     * @returns {Object.from} {x, y} coordinates of link start
     * @returns {Object.to} {x, y} coordinates of link end
     */
    getLinkPosition: getLinkPosition,

    /**
     * Requests layout algorithm to pin/unpin node to its current position
     * Pinned nodes should not be affected by layout algorithm and always
     * remain at their position
     *
     * @param {object} node graph node that needs to be pinned
     * @param {boolean} isPinned status of the node.
     */
    pinNode: asyncPinNode,

    /**
     * Sets position of a node to a given coordinates
     * @param {string} nodeId node identifier
     * @param {number} x position of a node
     * @param {number} y position of a node
     * @param {number=} z position of node (only if 3d layout)
     */
    setNodePosition: asyncNodePosition,

    /**
     * Gets rectangle (or a box) that bounds the graph
     */
    getGraphRect: getGraphRect,

    /**
     * Returns true if node is currently pinned (i.e. not moved by layout);
     * False otherwise.
     */
    isNodePinned: isNodePinned
  };

  eventify(api);

  return api;

  function asyncStep() {
    // we cannot do anything until we receive 'initDone' message from worker
    // to confirm that it's ready to process layout requests.
    if (pendingInitialization) return;

    layoutWorker.postMessage(stepMessage);

    // TODO: I need to rewrite ngraph.forcelayout to be even-driven,
    // so that it can notify caller about stable/unstable change asynchronously
    return systemStable;
  }

  function asyncNodePosition(nodeId, x, y, z) {
    // let layout know that we changed the position
    layoutWorker.postMessage({
      kind: messageKind.setNodePosition,
      payload: {
        nodeId: nodeId,
        x: x,
        y: y,
        z: z
      }
    });
    // also update synchronously our last remember position:
    assignPosition(positions[nodeId], { x: x, y: y, z: z });
  }

  function getGraphRect() {
    return graphRect;
  }

  function asyncPinNode(node, isPinned) {
    layoutWorker.postMessage({
      kind: messageKind.pinNode,
      payload: {
        nodeId: node.id,
        isPinned: isPinned
      }
    });

    // we need to have sync way of answering to isNodePinned request.
    // This is not perfect, since original graph configuration may
    // include pinned nodes. We currently do not take that into account.
    pinStatus[node.id] = isPinned;
  }

  function isNodePinned(node) {
    return pinStatus[node.id];
  }

  function initWorker() {
    if (initRequestSent) {
      throw new Error('Init request is already sent to the worker');
    }

    layoutWorker.postMessage({
      kind: messageKind.init,
      payload: {
        graph: tojson(graph),
        options: JSON.stringify(options)
      }
    });

    initRequestSent = true;
  }

  function initPositions() {
    // we need to initialize positions just once
    var layout = createLayout(graph, options);
    graph.forEachNode(initPosition);
    graphRect = layout.getGraphRect();

    function initPosition(node) {
      positions[node.id] = layout.getNodePosition(node.id);
    }
  }

  function getNodePosition(nodeId) {
    return positions[nodeId];
  }

  function getLinkPosition(linkId) {
    if (!linkPositions) {
      initializeLinkPositions();
    }
    return linkPositions[linkId];
  }

  function initializeLinkPositions() {
    linkPositions = Object.create(null);
    graph.forEachLink(function(link) {
      linkPositions[link.id] = {
        from: getNodePosition(link.fromId),
        to: getNodePosition(link.toId)
      };
    });
  }

  function handleMessageFromWorker(message) {
    var kind = message.data.kind;
    var payload = message.data.payload

    if (kind === messageKind.cycleComplete) {
      setPositions(payload.positions, payload.systemStable);
      graphRect = payload.bbox;
      api.fire('cycle', payload.iterations, payload.systemStable);
    } if (kind === messageKind.initDone) {
      pendingInitialization = false;
      asyncStep();
    }
  }

  function setPositions(newPositions, newSystemStable) {
    systemStable = newSystemStable;
    Object.keys(newPositions).forEach(updatePosition);
    return;

    function updatePosition(nodeId) {
      var newPosition = newPositions[nodeId];
      var oldPosition = positions[nodeId];
      if (!oldPosition) {
        positions[nodeId] = newPosition;
      } else {
        assignPosition(oldPosition, newPosition);
      }
    }
  }
}

function assignPosition3d(oldPos, newPos) {
  oldPos.x = newPos.x;
  oldPos.y = newPos.y;
  oldPos.z = newPos.z;
}

function assignPosition2d(oldPos, newPos) {
  oldPos.x = newPos.x;
  oldPos.y = newPos.y;
}

},{"./lib/createLayout.js":3,"./lib/layoutWorker.js":4,"./lib/messages.js":5,"./options.js":6,"ngraph.events":7,"ngraph.tojson":37,"webworkify":40}],3:[function(_dereq_,module,exports){
var layout3d = _dereq_('ngraph.forcelayout3d');
var layout2d = layout3d.get2dLayout;

module.exports = createLayout;

function createLayout(graph, options) {
  options = options || {};

  return options.is3d ?
    layout3d(graph, options.physics) :
    layout2d(graph, options.physics);
}

},{"ngraph.forcelayout3d":9}],4:[function(_dereq_,module,exports){
var createLayout = _dereq_('./createLayout.js');
var fromjson = _dereq_('ngraph.fromjson');
var validateOptions = _dereq_('../options.js');
var messageKind = _dereq_('./messages.js');

module.exports = layoutWorker;

/**
 * This method is executed as a webworker thread. It expects 'init' signal
 * from the main thread to start layout.
 */
function layoutWorker(self) {
  var layout; // main thread will send a message to initialize this
  var asyncOptions;
  var completedIterations = 0;
  var stepCalled = false;
  var timeoutId = 0;
  var systemStable = false;
  var graph;

  var positions = Object.create(null);
  self.addEventListener('message', handleMessageFromMainThread);

  return; // public API is over. Below are private methods only.

  function handleMessageFromMainThread(message) {
    var kind = message.data.kind;
    var payload = message.data.payload;

    if (kind === messageKind.init) {
      graph = fromjson(payload.graph);
      var options = JSON.parse(payload.options);

      init(graph, options);
    } else if (kind === messageKind.step) {
      step();
    } else if (kind === messageKind.pinNode) {
      pinNode(payload.nodeId, payload.isPinned);
    } else if (kind === messageKind.setNodePosition) {
      setNodePosition(payload.nodeId, payload.x, payload.y, payload.z);
    }
    // TODO: listen for graph changes from main thread and update layout here.
  }

  function setNodePosition(nodeId, x, y, z) {
    assertInitialized();

    layout.setNodePosition.apply(layout, arguments);
    systemStable = false;
    step();
  }

  function pinNode(nodeId, isPinned) {
    assertInitialized();

    var node = graph.getNode(nodeId);
    if (!node) return; // ignoring right now. should it throw?

    layout.pinNode(node, isPinned);
  }

  function assertInitialized() {
    if (!graph) throw new Error('Pin node requested without initialied graph');
    if (!layout) throw new Error('Layout was not created. Something is really wrong here');
  }

  function init(graph, options) {
    // unfortunately we need to revalidate here, since POSITIVE_INFINITY could
    // be lost during threads transition
    options = validateOptions(options);
    asyncOptions = options.async;

    layout = createLayout(graph, options);
    graph.forEachNode(initPosition);

    // let main thread know that we can process layout
    self.postMessage({ kind: messageKind.initDone });
  }

  function initPosition(node) {
    positions[node.id] = layout.getNodePosition(node.id);
  }

  function step() {
    assertInitialized();

    stepCalled = true;

    if (!timeoutId) {
      runLayoutCycleAsync();
    }
  }

  function runLayoutCycleAsync() {
    if (systemStable) {
      timeoutId = 0;
      return;
    }

    // we have to unblock this thread to receive messages from the main thread.
    timeoutId = setTimeout(function() {
      runLayoutCycle();

      // We either wait until next `step` event from RAF, or run now if asked to
      // not wait for `step`.
      if (stepCalled || !asyncOptions.waitForStep) {
        stepCalled = false;
        runLayoutCycleAsync();
      } else {
        // wait for the next event from the main thread to continue;
        timeoutId = 0;
      }
    }, 0);
  }

  function runLayoutCycle() {
    var wasStable = systemStable;
    for (var i = 0; i < asyncOptions.stepsPerCycle; ++i) {
      systemStable = layout.step();
      completedIterations += 1;
    }

    if (completedIterations >= asyncOptions.maxIterations) {
      systemStable = true;
    }

    self.postMessage({
      kind: messageKind.cycleComplete,
      payload: {
        positions: positions,
        systemStable: systemStable,
        bbox: layout.getGraphRect(),
        iterations: completedIterations
      }
    });
  }
};

},{"../options.js":6,"./createLayout.js":3,"./messages.js":5,"ngraph.fromjson":23}],5:[function(_dereq_,module,exports){
/**
 * This file defines all possible messages between main thread and
 * web worker. The key is human readable message type, and the value is a
 * numeric attribute for quick matching
 */
module.exports = {
  /**
   * Sent from main thread to web worker to initialize force layout
   *
   * payload:
   *  {string} graph - result of ngraph.tojson(graph) operation.
   *  {string} options - stringified optinons received by ngraph.asyncforce().
   */
  init: 10,

  /**
   * Sent from web worker to main thread to confirm that worker has done
   * initializatino and can process incoming layout requests
   *
   * payload: undefined.
   */
  initDone: 11,

  /**
   * Sent from main thread to web worker to notify that rendering loop is currently
   * active and worker should perform layout (if required). Worker can decide
   * to ignore this request if, for example, layout is already computed, or
   * worker has performed more than options.async.maxIterations iterations.
   *
   * payload: undefined.
   */
  step: 12,

  /**
   * Sent from webworker to main thread to indicate that worker has finished
   * one cycle of layout iterations. Each cycle can perform up to
   * options.asnc.stepsPerCycle iterations of layout.
   *
   * payload:
   *  {object} positions - keys are node ids, values are {x, y, z} coordinates
   *  {boolean} systemStable - indicates that system is stable. NOTE: this will
   *  be removed from future version.
   */
  cycleComplete: 13,

  /**
   * Sent from main thread to web worker to pin node
   *
   * payload:
   *   {string} nodeId - identifier of the node that needs to be pinned
   *   {boolean} isPinned status of the node
   */
  pinNode: 41,

  /**
   * Sent from main thread to web worker to set position of the node
   *
   * payload:
   *  {string} nodeId - identifier of the node that needs position update.
   *  {number} x - x coordinate
   *  {number} y - y coordinate
   *  {number+} z - z coordinate - only applicable for 3d layout
   */
  setNodePosition: 43
};

},{}],6:[function(_dereq_,module,exports){
/**
 * This file defines configuration options for the asyncforce module. Every
 * configuration is optional. You can find its description and default value below.
 */
module.exports = validateOptions;

function validateOptions(options) {
  options = options || {};

  /**
   * Do we need to run 3D layout or 2D?
   */
  options.is3d = typeof options.is3d === 'boolean' ? options.is3d : false;

  // These options are in separate object since they configure web worker behavior
  // not layout.
  var async = (options.async = options.async || {});

  /**
   * Web worker computes layout in cycles. After each cycle is done web worker
   * notifies the main thread with updated positions. This options defines
   * how many layout steps should web worker complete within one cycle.
   */
  async.stepsPerCycle = typeof async.stepsPerCycle === 'number' ? async.stepsPerCycle : 5;

  /**
   * By default layout will be computed as long as each iteration brings too
   * much movement to the system. However if you'd like to compute only N iterations
   * of layout, you can set this option to N. Once layout reaches N it will consider
   * system stable and will not compute more iterations.
   */
  async.maxIterations = typeof async.maxIterations === 'number' ? async.maxIterations : Number.POSITIVE_INFINITY;

  /**
   * Unlike requestAnimationFrame() web workers are executed even when page is
   * not active (e.g. user switched to a different browser tab). This can result
   * in unnecessary CPU consumption and battery drain.
   *
   * By default asyncforce will calculate layout as long as you call
   * `asncforce.step()`. Normally you will call this method from
   * requestAnimationFrame() handler to manage CPU resources.
   *
   * However, if you prefer to keep computing layout in background set this
   * options to true. Layout will be computed until system is considered stable
   * (see `maxIterations` above).
   */
  async.waitForStep = typeof async.waitForStep === 'boolean' ? async.waitForStep : true;
  return options;
}

},{}],7:[function(_dereq_,module,exports){
module.exports = function(subject) {
  validateSubject(subject);

  var eventsStorage = createEventsStorage(subject);
  subject.on = eventsStorage.on;
  subject.off = eventsStorage.off;
  subject.fire = eventsStorage.fire;
  return subject;
};

function createEventsStorage(subject) {
  // Store all event listeners to this hash. Key is event name, value is array
  // of callback records.
  //
  // A callback record consists of callback function and its optional context:
  // { 'eventName' => [{callback: function, ctx: object}] }
  var registeredEvents = Object.create(null);

  return {
    on: function (eventName, callback, ctx) {
      if (typeof callback !== 'function') {
        throw new Error('callback is expected to be a function');
      }
      var handlers = registeredEvents[eventName];
      if (!handlers) {
        handlers = registeredEvents[eventName] = [];
      }
      handlers.push({callback: callback, ctx: ctx});

      return subject;
    },

    off: function (eventName, callback) {
      var wantToRemoveAll = (typeof eventName === 'undefined');
      if (wantToRemoveAll) {
        // Killing old events storage should be enough in this case:
        registeredEvents = Object.create(null);
        return subject;
      }

      if (registeredEvents[eventName]) {
        var deleteAllCallbacksForEvent = (typeof callback !== 'function');
        if (deleteAllCallbacksForEvent) {
          delete registeredEvents[eventName];
        } else {
          var callbacks = registeredEvents[eventName];
          for (var i = 0; i < callbacks.length; ++i) {
            if (callbacks[i].callback === callback) {
              callbacks.splice(i, 1);
            }
          }
        }
      }

      return subject;
    },

    fire: function (eventName) {
      var callbacks = registeredEvents[eventName];
      if (!callbacks) {
        return subject;
      }

      var fireArguments;
      if (arguments.length > 1) {
        fireArguments = Array.prototype.splice.call(arguments, 1);
      }
      for(var i = 0; i < callbacks.length; ++i) {
        var callbackInfo = callbacks[i];
        callbackInfo.callback.apply(callbackInfo.ctx, fireArguments);
      }

      return subject;
    }
  };
}

function validateSubject(subject) {
  if (!subject) {
    throw new Error('Eventify cannot use falsy object as events subject');
  }
  var reservedWords = ['on', 'fire', 'off'];
  for (var i = 0; i < reservedWords.length; ++i) {
    if (subject.hasOwnProperty(reservedWords[i])) {
      throw new Error("Subject cannot be eventified, since it already has property '" + reservedWords[i] + "'");
    }
  }
}

},{}],8:[function(_dereq_,module,exports){
module.exports = exposeProperties;

/**
 * Augments `target` object with getter/setter functions, which modify settings
 *
 * @example
 *  var target = {};
 *  exposeProperties({ age: 42}, target);
 *  target.age(); // returns 42
 *  target.age(24); // make age 24;
 *
 *  var filteredTarget = {};
 *  exposeProperties({ age: 42, name: 'John'}, filteredTarget, ['name']);
 *  filteredTarget.name(); // returns 'John'
 *  filteredTarget.age === undefined; // true
 */
function exposeProperties(settings, target, filter) {
  var needsFilter = Object.prototype.toString.call(filter) === '[object Array]';
  if (needsFilter) {
    for (var i = 0; i < filter.length; ++i) {
      augment(settings, target, filter[i]);
    }
  } else {
    for (var key in settings) {
      augment(settings, target, key);
    }
  }
}

function augment(source, target, key) {
  if (source.hasOwnProperty(key)) {
    if (typeof target[key] === 'function') {
      // this accessor is already defined. Ignore it
      return;
    }
    target[key] = function (value) {
      if (value !== undefined) {
        source[key] = value;
        return target;
      }
      return source[key];
    }
  }
}

},{}],9:[function(_dereq_,module,exports){
/**
 * This module provides all required forces to regular ngraph.physics.simulator
 * to make it 3D simulator. Ideally ngraph.physics.simulator should operate
 * with vectors, but on practices that showed performance decrease... Maybe
 * I was doing it wrong, will see if I can refactor/throw away this module.
 */
module.exports = createLayout;
createLayout.get2dLayout = _dereq_('ngraph.forcelayout');

function createLayout(graph, physicsSettings) {
  var merge = _dereq_('ngraph.merge');
  physicsSettings = merge(physicsSettings, {
        createQuadTree: _dereq_('ngraph.quadtreebh3d'),
        createBounds: _dereq_('./lib/bounds'),
        createDragForce: _dereq_('./lib/dragForce'),
        createSpringForce: _dereq_('./lib/springForce'),
        integrator: _dereq_('./lib/eulerIntegrator'),
        createBody: _dereq_('./lib/createBody')
      });

  return createLayout.get2dLayout(graph, physicsSettings);
}

},{"./lib/bounds":10,"./lib/createBody":11,"./lib/dragForce":12,"./lib/eulerIntegrator":13,"./lib/springForce":14,"ngraph.forcelayout":15,"ngraph.merge":26,"ngraph.quadtreebh3d":28}],10:[function(_dereq_,module,exports){
module.exports = function (bodies, settings) {
  var random = _dereq_('ngraph.random').random(42);
  var boundingBox =  { x1: 0, y1: 0, z1: 0, x2: 0, y2: 0, z2: 0 };

  return {
    box: boundingBox,

    update: updateBoundingBox,

    reset : function () {
      boundingBox.x1 = boundingBox.y1 = 0;
      boundingBox.x2 = boundingBox.y2 = 0;
      boundingBox.z1 = boundingBox.z2 = 0;
    },

    getBestNewPosition: function (neighbors) {
      var graphRect = boundingBox;

      var baseX = 0, baseY = 0, baseZ = 0;

      if (neighbors.length) {
        for (var i = 0; i < neighbors.length; ++i) {
          baseX += neighbors[i].pos.x;
          baseY += neighbors[i].pos.y;
          baseZ += neighbors[i].pos.z;
        }

        baseX /= neighbors.length;
        baseY /= neighbors.length;
        baseZ /= neighbors.length;
      } else {
        baseX = (graphRect.x1 + graphRect.x2) / 2;
        baseY = (graphRect.y1 + graphRect.y2) / 2;
        baseZ = (graphRect.z1 + graphRect.z2) / 2;
      }

      var springLength = settings.springLength;
      return {
        x: baseX + random.next(springLength) - springLength / 2,
        y: baseY + random.next(springLength) - springLength / 2,
        z: baseZ + random.next(springLength) - springLength / 2
      };
    }
  };

  function updateBoundingBox() {
    var i = bodies.length;
    if (i === 0) { return; } // don't have to wory here.

    var x1 = Number.MAX_VALUE,
        y1 = Number.MAX_VALUE,
        z1 = Number.MAX_VALUE,
        x2 = Number.MIN_VALUE,
        y2 = Number.MIN_VALUE,
        z2 = Number.MIN_VALUE;

    while(i--) {
      // this is O(n), could it be done faster with quadtree?
      // how about pinned nodes?
      var body = bodies[i];
      if (body.isPinned) {
        body.pos.x = body.prevPos.x;
        body.pos.y = body.prevPos.y;
        body.pos.z = body.prevPos.z;
      } else {
        body.prevPos.x = body.pos.x;
        body.prevPos.y = body.pos.y;
        body.prevPos.z = body.pos.z;
      }
      if (body.pos.x < x1) {
        x1 = body.pos.x;
      }
      if (body.pos.x > x2) {
        x2 = body.pos.x;
      }
      if (body.pos.y < y1) {
        y1 = body.pos.y;
      }
      if (body.pos.y > y2) {
        y2 = body.pos.y;
      }
      if (body.pos.z < z1) {
        z1 = body.pos.z;
      }
      if (body.pos.z > z2) {
        z2 = body.pos.z;
      }
    }

    boundingBox.x1 = x1;
    boundingBox.x2 = x2;
    boundingBox.y1 = y1;
    boundingBox.y2 = y2;
    boundingBox.z1 = z1;
    boundingBox.z2 = z2;
  }
};

},{"ngraph.random":36}],11:[function(_dereq_,module,exports){
var physics = _dereq_('ngraph.physics.primitives');

module.exports = function(pos) {
  return new physics.Body3d(pos);
}

},{"ngraph.physics.primitives":27}],12:[function(_dereq_,module,exports){
/**
 * Represents 3d drag force, which reduces force value on each step by given
 * coefficient.
 *
 * @param {Object} options for the drag force
 * @param {Number=} options.dragCoeff drag force coefficient. 0.1 by default
 */
module.exports = function (options) {
  var merge = _dereq_('ngraph.merge'),
      expose = _dereq_('ngraph.expose');

  options = merge(options, {
    dragCoeff: 0.02
  });

  var api = {
    update : function (body) {
      body.force.x -= options.dragCoeff * body.velocity.x;
      body.force.y -= options.dragCoeff * body.velocity.y;
      body.force.z -= options.dragCoeff * body.velocity.z;
    }
  };

  // let easy access to dragCoeff:
  expose(options, api, ['dragCoeff']);

  return api;
};

},{"ngraph.expose":8,"ngraph.merge":26}],13:[function(_dereq_,module,exports){
/**
 * Performs 3d forces integration, using given timestep. Uses Euler method to solve
 * differential equation (http://en.wikipedia.org/wiki/Euler_method ).
 *
 * @returns {Number} squared distance of total position updates.
 */

module.exports = integrate;

function integrate(bodies, timeStep) {
  var dx = 0, tx = 0,
      dy = 0, ty = 0,
      dz = 0, tz = 0,
      i,
      max = bodies.length;

  for (i = 0; i < max; ++i) {
    var body = bodies[i],
        coeff = timeStep / body.mass;

    body.velocity.x += coeff * body.force.x;
    body.velocity.y += coeff * body.force.y;
    body.velocity.z += coeff * body.force.z;

    var vx = body.velocity.x,
        vy = body.velocity.y,
        vz = body.velocity.z,
        v = Math.sqrt(vx * vx + vy * vy + vz * vz);

    if (v > 1) {
      body.velocity.x = vx / v;
      body.velocity.y = vy / v;
      body.velocity.z = vz / v;
    }

    dx = timeStep * body.velocity.x;
    dy = timeStep * body.velocity.y;
    dz = timeStep * body.velocity.z;

    body.pos.x += dx;
    body.pos.y += dy;
    body.pos.z += dz;

    tx += Math.abs(dx); ty += Math.abs(dy); tz += Math.abs(dz);
  }

  return (tx * tx + ty * ty + tz * tz)/bodies.length;
}

},{}],14:[function(_dereq_,module,exports){
/**
 * Represents 3d spring force, which updates forces acting on two bodies, conntected
 * by a spring.
 *
 * @param {Object} options for the spring force
 * @param {Number=} options.springCoeff spring force coefficient.
 * @param {Number=} options.springLength desired length of a spring at rest.
 */
module.exports = function (options) {
  var merge = _dereq_('ngraph.merge');
  var random = _dereq_('ngraph.random').random(42);
  var expose = _dereq_('ngraph.expose');

  options = merge(options, {
    springCoeff: 0.0002,
    springLength: 80
  });

  var api = {
    /**
     * Upsates forces acting on a spring
     */
    update : function (spring) {
      var body1 = spring.from,
          body2 = spring.to,
          length = spring.length < 0 ? options.springLength : spring.length,
          dx = body2.pos.x - body1.pos.x,
          dy = body2.pos.y - body1.pos.y,
          dz = body2.pos.z - body1.pos.z,
          r = Math.sqrt(dx * dx + dy * dy + dz * dz);

      if (r === 0) {
          dx = (random.nextDouble() - 0.5) / 50;
          dy = (random.nextDouble() - 0.5) / 50;
          dz = (random.nextDouble() - 0.5) / 50;
          r = Math.sqrt(dx * dx + dy * dy + dz * dz);
      }

      var d = r - length;
      var coeff = ((!spring.coeff || spring.coeff < 0) ? options.springCoeff : spring.coeff) * d / r * spring.weight;

      body1.force.x += coeff * dx;
      body1.force.y += coeff * dy;
      body1.force.z += coeff * dz;

      body2.force.x -= coeff * dx;
      body2.force.y -= coeff * dy;
      body2.force.z -= coeff * dz;
    }
  };

  expose(options, api, ['springCoeff', 'springLength']);
  return api;
}

},{"ngraph.expose":8,"ngraph.merge":26,"ngraph.random":36}],15:[function(_dereq_,module,exports){
module.exports = createLayout;
module.exports.simulator = _dereq_('ngraph.physics.simulator');

/**
 * Creates force based layout for a given graph.
 * @param {ngraph.graph} graph which needs to be laid out
 * @param {object} physicsSettings if you need custom settings
 * for physics simulator you can pass your own settings here. If it's not passed
 * a default one will be created.
 */
function createLayout(graph, physicsSettings) {
  if (!graph) {
    throw new Error('Graph structure cannot be undefined');
  }

  var createSimulator = _dereq_('ngraph.physics.simulator');
  var physicsSimulator = createSimulator(physicsSettings);

  var nodeBodies = typeof Object.create === 'function' ? Object.create(null) : {};
  var springs = {};

  var springTransform = physicsSimulator.settings.springTransform || noop;

  // Initialize physical objects according to what we have in the graph:
  initPhysics();
  listenToGraphEvents();

  var api = {
    /**
     * Performs one step of iterative layout algorithm
     */
    step: function() {
      return physicsSimulator.step();
    },

    /**
     * For a given `nodeId` returns position
     */
    getNodePosition: function (nodeId) {
      return getInitializedBody(nodeId).pos;
    },

    /**
     * Sets position of a node to a given coordinates
     * @param {string} nodeId node identifier
     * @param {number} x position of a node
     * @param {number} y position of a node
     * @param {number=} z position of node (only if applicable to body)
     */
    setNodePosition: function (nodeId) {
      var body = getInitializedBody(nodeId);
      body.setPosition.apply(body, Array.prototype.slice.call(arguments, 1));
    },

    /**
     * @returns {Object} Link position by link id
     * @returns {Object.from} {x, y} coordinates of link start
     * @returns {Object.to} {x, y} coordinates of link end
     */
    getLinkPosition: function (linkId) {
      var spring = springs[linkId];
      if (spring) {
        return {
          from: spring.from.pos,
          to: spring.to.pos
        };
      }
    },

    /**
     * @returns {Object} area required to fit in the graph. Object contains
     * `x1`, `y1` - top left coordinates
     * `x2`, `y2` - bottom right coordinates
     */
    getGraphRect: function () {
      return physicsSimulator.getBBox();
    },

    /*
     * Requests layout algorithm to pin/unpin node to its current position
     * Pinned nodes should not be affected by layout algorithm and always
     * remain at their position
     */
    pinNode: function (node, isPinned) {
      var body = getInitializedBody(node.id);
       body.isPinned = !!isPinned;
    },

    /**
     * Checks whether given graph's node is currently pinned
     */
    isNodePinned: function (node) {
      return getInitializedBody(node.id).isPinned;
    },

    /**
     * Request to release all resources
     */
    dispose: function() {
      graph.off('changed', onGraphChanged);
    },

    /**
     * Gets physical body for a given node id. If node is not found undefined
     * value is returned.
     */
    getBody: getBody,

    /**
     * Gets spring for a given edge.
     *
     * @param {string} linkId link identifer. If two arguments are passed then
     * this argument is treated as formNodeId
     * @param {string=} toId when defined this parameter denotes head of the link
     * and first argument is trated as tail of the link (fromId)
     */
    getSpring: getSpring,

    /**
     * [Read only] Gets current physics simulator
     */
    simulator: physicsSimulator
  };

  return api;

  function getSpring(fromId, toId) {
    var linkId;
    if (toId === undefined) {
      if (typeof fromId === 'string') {
        // assume fromId as a linkId:
        linkId = fromId;
      } else {
        // assume fromId to be a link object:
        linkId = fromId.id;
      }
    } else {
      // toId is defined, should grab link:
      var link = graph.hasLink(fromId, toId);
      if (!link) return;
      linkId = link.id;
    }

    return springs[linkId];
  }

  function getBody(nodeId) {
    return nodeBodies[nodeId];
  }

  function listenToGraphEvents() {
    graph.on('changed', onGraphChanged);
  }

  function onGraphChanged(changes) {
    for (var i = 0; i < changes.length; ++i) {
      var change = changes[i];
      if (change.changeType === 'add') {
        if (change.node) {
          initBody(change.node.id);
        }
        if (change.link) {
          initLink(change.link);
        }
      } else if (change.changeType === 'remove') {
        if (change.node) {
          releaseNode(change.node);
        }
        if (change.link) {
          releaseLink(change.link);
        }
      }
    }
  }

  function initPhysics() {
    graph.forEachNode(function (node) {
      initBody(node.id);
    });
    graph.forEachLink(initLink);
  }

  function initBody(nodeId) {
    var body = nodeBodies[nodeId];
    if (!body) {
      var node = graph.getNode(nodeId);
      if (!node) {
        throw new Error('initBody() was called with unknown node id');
      }

      var pos = node.position;
      if (!pos) {
        var neighbors = getNeighborBodies(node);
        pos = physicsSimulator.getBestNewBodyPosition(neighbors);
      }

      body = physicsSimulator.addBodyAt(pos);

      nodeBodies[nodeId] = body;
      updateBodyMass(nodeId);

      if (isNodeOriginallyPinned(node)) {
        body.isPinned = true;
      }
    }
  }

  function releaseNode(node) {
    var nodeId = node.id;
    var body = nodeBodies[nodeId];
    if (body) {
      nodeBodies[nodeId] = null;
      delete nodeBodies[nodeId];

      physicsSimulator.removeBody(body);
    }
  }

  function initLink(link) {
    updateBodyMass(link.fromId);
    updateBodyMass(link.toId);

    var fromBody = nodeBodies[link.fromId],
        toBody  = nodeBodies[link.toId],
        spring = physicsSimulator.addSpring(fromBody, toBody, link.length);

    springTransform(link, spring);

    springs[link.id] = spring;
  }

  function releaseLink(link) {
    var spring = springs[link.id];
    if (spring) {
      var from = graph.getNode(link.fromId),
          to = graph.getNode(link.toId);

      if (from) updateBodyMass(from.id);
      if (to) updateBodyMass(to.id);

      delete springs[link.id];

      physicsSimulator.removeSpring(spring);
    }
  }

  function getNeighborBodies(node) {
    // TODO: Could probably be done better on memory
    var neighbors = [];
    if (!node.links) {
      return neighbors;
    }
    var maxNeighbors = Math.min(node.links.length, 2);
    for (var i = 0; i < maxNeighbors; ++i) {
      var link = node.links[i];
      var otherBody = link.fromId !== node.id ? nodeBodies[link.fromId] : nodeBodies[link.toId];
      if (otherBody && otherBody.pos) {
        neighbors.push(otherBody);
      }
    }

    return neighbors;
  }

  function updateBodyMass(nodeId) {
    var body = nodeBodies[nodeId];
    body.mass = nodeMass(nodeId);
  }

  /**
   * Checks whether graph node has in its settings pinned attribute,
   * which means layout algorithm cannot move it. Node can be preconfigured
   * as pinned, if it has "isPinned" attribute, or when node.data has it.
   *
   * @param {Object} node a graph node to check
   * @return {Boolean} true if node should be treated as pinned; false otherwise.
   */
  function isNodeOriginallyPinned(node) {
    return (node && (node.isPinned || (node.data && node.data.isPinned)));
  }

  function getInitializedBody(nodeId) {
    var body = nodeBodies[nodeId];
    if (!body) {
      initBody(nodeId);
      body = nodeBodies[nodeId];
    }
    return body;
  }

  /**
   * Calculates mass of a body, which corresponds to node with given id.
   *
   * @param {String|Number} nodeId identifier of a node, for which body mass needs to be calculated
   * @returns {Number} recommended mass of the body;
   */
  function nodeMass(nodeId) {
    return 1 + graph.getLinks(nodeId).length / 3.0;
  }
}

function noop() { }

},{"ngraph.physics.simulator":16}],16:[function(_dereq_,module,exports){
/**
 * Manages a simulation of physical forces acting on bodies and springs.
 */
module.exports = physicsSimulator;

function physicsSimulator(settings) {
  var Spring = _dereq_('./lib/spring');
  var expose = _dereq_('ngraph.expose');
  var merge = _dereq_('ngraph.merge');

  settings = merge(settings, {
      /**
       * Ideal length for links (springs in physical model).
       */
      springLength: 30,

      /**
       * Hook's law coefficient. 1 - solid spring.
       */
      springCoeff: 0.0008,

      /**
       * Coulomb's law coefficient. It's used to repel nodes thus should be negative
       * if you make it positive nodes start attract each other :).
       */
      gravity: -1.2,

      /**
       * Theta coefficient from Barnes Hut simulation. Ranged between (0, 1).
       * The closer it's to 1 the more nodes algorithm will have to go through.
       * Setting it to one makes Barnes Hut simulation no different from
       * brute-force forces calculation (each node is considered).
       */
      theta: 0.8,

      /**
       * Drag force coefficient. Used to slow down system, thus should be less than 1.
       * The closer it is to 0 the less tight system will be.
       */
      dragCoeff: 0.02,

      /**
       * Default time step (dt) for forces integration
       */
      timeStep : 20,

      /**
        * Maximum movement of the system which can be considered as stabilized
        */
      stableThreshold: 0.009
  });

  // We allow clients to override basic factory methods:
  var createQuadTree = settings.createQuadTree || _dereq_('ngraph.quadtreebh');
  var createBounds = settings.createBounds || _dereq_('./lib/bounds');
  var createDragForce = settings.createDragForce || _dereq_('./lib/dragForce');
  var createSpringForce = settings.createSpringForce || _dereq_('./lib/springForce');
  var integrate = settings.integrator || _dereq_('./lib/eulerIntegrator');
  var createBody = settings.createBody || _dereq_('./lib/createBody');

  var bodies = [], // Bodies in this simulation.
      springs = [], // Springs in this simulation.
      quadTree =  createQuadTree(settings),
      bounds = createBounds(bodies, settings),
      springForce = createSpringForce(settings),
      dragForce = createDragForce(settings);

  var publicApi = {
    /**
     * Array of bodies, registered with current simulator
     *
     * Note: To add new body, use addBody() method. This property is only
     * exposed for testing/performance purposes.
     */
    bodies: bodies,

    /**
     * Array of springs, registered with current simulator
     *
     * Note: To add new spring, use addSpring() method. This property is only
     * exposed for testing/performance purposes.
     */
    springs: springs,

    /**
     * Returns settings with which current simulator was initialized
     */
    settings: settings,

    /**
     * Performs one step of force simulation.
     *
     * @returns {boolean} true if system is considered stable; False otherwise.
     */
    step: function () {
      accumulateForces();
      var totalMovement = integrate(bodies, settings.timeStep);

      bounds.update();

      return totalMovement < settings.stableThreshold;
    },

    /**
     * Adds body to the system
     *
     * @param {ngraph.physics.primitives.Body} body physical body
     *
     * @returns {ngraph.physics.primitives.Body} added body
     */
    addBody: function (body) {
      if (!body) {
        throw new Error('Body is required');
      }
      bodies.push(body);

      return body;
    },

    /**
     * Adds body to the system at given position
     *
     * @param {Object} pos position of a body
     *
     * @returns {ngraph.physics.primitives.Body} added body
     */
    addBodyAt: function (pos) {
      if (!pos) {
        throw new Error('Body position is required');
      }
      var body = createBody(pos);
      bodies.push(body);

      return body;
    },

    /**
     * Removes body from the system
     *
     * @param {ngraph.physics.primitives.Body} body to remove
     *
     * @returns {Boolean} true if body found and removed. falsy otherwise;
     */
    removeBody: function (body) {
      if (!body) { return; }

      var idx = bodies.indexOf(body);
      if (idx < 0) { return; }

      bodies.splice(idx, 1);
      if (bodies.length === 0) {
        bounds.reset();
      }
      return true;
    },

    /**
     * Adds a spring to this simulation.
     *
     * @returns {Object} - a handle for a spring. If you want to later remove
     * spring pass it to removeSpring() method.
     */
    addSpring: function (body1, body2, springLength, springWeight, springCoefficient) {
      if (!body1 || !body2) {
        throw new Error('Cannot add null spring to force simulator');
      }

      if (typeof springLength !== 'number') {
        springLength = -1; // assume global configuration
      }

      var spring = new Spring(body1, body2, springLength, springCoefficient >= 0 ? springCoefficient : -1, springWeight);
      springs.push(spring);

      // TODO: could mark simulator as dirty.
      return spring;
    },

    /**
     * Removes spring from the system
     *
     * @param {Object} spring to remove. Spring is an object returned by addSpring
     *
     * @returns {Boolean} true if spring found and removed. falsy otherwise;
     */
    removeSpring: function (spring) {
      if (!spring) { return; }
      var idx = springs.indexOf(spring);
      if (idx > -1) {
        springs.splice(idx, 1);
        return true;
      }
    },

    getBestNewBodyPosition: function (neighbors) {
      return bounds.getBestNewPosition(neighbors);
    },

    /**
     * Returns bounding box which covers all bodies
     */
    getBBox: function () {
      return bounds.box;
    },

    gravity: function (value) {
      if (value !== undefined) {
        settings.gravity = value;
        quadTree.options({gravity: value});
        return this;
      } else {
        return settings.gravity;
      }
    },

    theta: function (value) {
      if (value !== undefined) {
        settings.theta = value;
        quadTree.options({theta: value});
        return this;
      } else {
        return settings.theta;
      }
    }
  };

  // allow settings modification via public API:
  expose(settings, publicApi);

  return publicApi;

  function accumulateForces() {
    // Accumulate forces acting on bodies.
    var body,
        i = bodies.length;

    if (i) {
      // only add bodies if there the array is not empty:
      quadTree.insertBodies(bodies); // performance: O(n * log n)
      while (i--) {
        body = bodies[i];
        // If body is pinned there is no point updating its forces - it should
        // never move:
        if (!body.isPinned) {
          body.force.reset();

          quadTree.updateBodyForce(body);
          dragForce.update(body);
        }
      }
    }

    i = springs.length;
    while(i--) {
      springForce.update(springs[i]);
    }
  }
};

},{"./lib/bounds":17,"./lib/createBody":18,"./lib/dragForce":19,"./lib/eulerIntegrator":20,"./lib/spring":21,"./lib/springForce":22,"ngraph.expose":8,"ngraph.merge":26,"ngraph.quadtreebh":32}],17:[function(_dereq_,module,exports){
module.exports = function (bodies, settings) {
  var random = _dereq_('ngraph.random').random(42);
  var boundingBox =  { x1: 0, y1: 0, x2: 0, y2: 0 };

  return {
    box: boundingBox,

    update: updateBoundingBox,

    reset : function () {
      boundingBox.x1 = boundingBox.y1 = 0;
      boundingBox.x2 = boundingBox.y2 = 0;
    },

    getBestNewPosition: function (neighbors) {
      var graphRect = boundingBox;

      var baseX = 0, baseY = 0;

      if (neighbors.length) {
        for (var i = 0; i < neighbors.length; ++i) {
          baseX += neighbors[i].pos.x;
          baseY += neighbors[i].pos.y;
        }

        baseX /= neighbors.length;
        baseY /= neighbors.length;
      } else {
        baseX = (graphRect.x1 + graphRect.x2) / 2;
        baseY = (graphRect.y1 + graphRect.y2) / 2;
      }

      var springLength = settings.springLength;
      return {
        x: baseX + random.next(springLength) - springLength / 2,
        y: baseY + random.next(springLength) - springLength / 2
      };
    }
  };

  function updateBoundingBox() {
    var i = bodies.length;
    if (i === 0) { return; } // don't have to wory here.

    var x1 = Number.MAX_VALUE,
        y1 = Number.MAX_VALUE,
        x2 = Number.MIN_VALUE,
        y2 = Number.MIN_VALUE;

    while(i--) {
      // this is O(n), could it be done faster with quadtree?
      // how about pinned nodes?
      var body = bodies[i];
      if (body.isPinned) {
        body.pos.x = body.prevPos.x;
        body.pos.y = body.prevPos.y;
      } else {
        body.prevPos.x = body.pos.x;
        body.prevPos.y = body.pos.y;
      }
      if (body.pos.x < x1) {
        x1 = body.pos.x;
      }
      if (body.pos.x > x2) {
        x2 = body.pos.x;
      }
      if (body.pos.y < y1) {
        y1 = body.pos.y;
      }
      if (body.pos.y > y2) {
        y2 = body.pos.y;
      }
    }

    boundingBox.x1 = x1;
    boundingBox.x2 = x2;
    boundingBox.y1 = y1;
    boundingBox.y2 = y2;
  }
}

},{"ngraph.random":36}],18:[function(_dereq_,module,exports){
var physics = _dereq_('ngraph.physics.primitives');

module.exports = function(pos) {
  return new physics.Body(pos);
}

},{"ngraph.physics.primitives":27}],19:[function(_dereq_,module,exports){
/**
 * Represents drag force, which reduces force value on each step by given
 * coefficient.
 *
 * @param {Object} options for the drag force
 * @param {Number=} options.dragCoeff drag force coefficient. 0.1 by default
 */
module.exports = function (options) {
  var merge = _dereq_('ngraph.merge'),
      expose = _dereq_('ngraph.expose');

  options = merge(options, {
    dragCoeff: 0.02
  });

  var api = {
    update : function (body) {
      body.force.x -= options.dragCoeff * body.velocity.x;
      body.force.y -= options.dragCoeff * body.velocity.y;
    }
  };

  // let easy access to dragCoeff:
  expose(options, api, ['dragCoeff']);

  return api;
};

},{"ngraph.expose":8,"ngraph.merge":26}],20:[function(_dereq_,module,exports){
/**
 * Performs forces integration, using given timestep. Uses Euler method to solve
 * differential equation (http://en.wikipedia.org/wiki/Euler_method ).
 *
 * @returns {Number} squared distance of total position updates.
 */

module.exports = integrate;

function integrate(bodies, timeStep) {
  var dx = 0, tx = 0,
      dy = 0, ty = 0,
      i,
      max = bodies.length;

  for (i = 0; i < max; ++i) {
    var body = bodies[i],
        coeff = timeStep / body.mass;

    body.velocity.x += coeff * body.force.x;
    body.velocity.y += coeff * body.force.y;
    var vx = body.velocity.x,
        vy = body.velocity.y,
        v = Math.sqrt(vx * vx + vy * vy);

    if (v > 1) {
      body.velocity.x = vx / v;
      body.velocity.y = vy / v;
    }

    dx = timeStep * body.velocity.x;
    dy = timeStep * body.velocity.y;

    body.pos.x += dx;
    body.pos.y += dy;

    tx += Math.abs(dx); ty += Math.abs(dy);
  }

  return (tx * tx + ty * ty)/bodies.length;
}

},{}],21:[function(_dereq_,module,exports){
module.exports = Spring;

/**
 * Represents a physical spring. Spring connects two bodies, has rest length
 * stiffness coefficient and optional weight
 */
function Spring(fromBody, toBody, length, coeff, weight) {
    this.from = fromBody;
    this.to = toBody;
    this.length = length;
    this.coeff = coeff;

    this.weight = typeof weight === 'number' ? weight : 1;
};

},{}],22:[function(_dereq_,module,exports){
/**
 * Represents spring force, which updates forces acting on two bodies, conntected
 * by a spring.
 *
 * @param {Object} options for the spring force
 * @param {Number=} options.springCoeff spring force coefficient.
 * @param {Number=} options.springLength desired length of a spring at rest.
 */
module.exports = function (options) {
  var merge = _dereq_('ngraph.merge');
  var random = _dereq_('ngraph.random').random(42);
  var expose = _dereq_('ngraph.expose');

  options = merge(options, {
    springCoeff: 0.0002,
    springLength: 80
  });

  var api = {
    /**
     * Upsates forces acting on a spring
     */
    update : function (spring) {
      var body1 = spring.from,
          body2 = spring.to,
          length = spring.length < 0 ? options.springLength : spring.length,
          dx = body2.pos.x - body1.pos.x,
          dy = body2.pos.y - body1.pos.y,
          r = Math.sqrt(dx * dx + dy * dy);

      if (r === 0) {
          dx = (random.nextDouble() - 0.5) / 50;
          dy = (random.nextDouble() - 0.5) / 50;
          r = Math.sqrt(dx * dx + dy * dy);
      }

      var d = r - length;
      var coeff = ((!spring.coeff || spring.coeff < 0) ? options.springCoeff : spring.coeff) * d / r * spring.weight;

      body1.force.x += coeff * dx;
      body1.force.y += coeff * dy;

      body2.force.x -= coeff * dx;
      body2.force.y -= coeff * dy;
    }
  };

  expose(options, api, ['springCoeff', 'springLength']);
  return api;
}

},{"ngraph.expose":8,"ngraph.merge":26,"ngraph.random":36}],23:[function(_dereq_,module,exports){
module.exports = load;

var createGraph = _dereq_('ngraph.graph');

function load(jsonGraph, nodeTransform, linkTransform) {
  var stored;
  nodeTransform = nodeTransform || id;
  linkTransform = linkTransform || id;
  if (typeof jsonGraph === 'string') {
    stored = JSON.parse(jsonGraph);
  } else {
    stored = jsonGraph;
  }

  var graph = createGraph(),
      i;

  if (stored.links === undefined || stored.nodes === undefined) {
    throw new Error('Cannot load graph without links and nodes');
  }

  for (i = 0; i < stored.nodes.length; ++i) {
    var parsedNode = nodeTransform(stored.nodes[i]);
    if (!parsedNode.hasOwnProperty('id')) {
      throw new Error('Graph node format is invalid: Node id is missing');
    }

    graph.addNode(parsedNode.id, parsedNode.data);
  }

  for (i = 0; i < stored.links.length; ++i) {
    var link = linkTransform(stored.links[i]);
    if (!link.hasOwnProperty('fromId') || !link.hasOwnProperty('toId')) {
      throw new Error('Graph link format is invalid. Both fromId and toId are required');
    }

    graph.addLink(link.fromId, link.toId, link.data);
  }

  return graph;
}

function id(x) { return x; }

},{"ngraph.graph":24}],24:[function(_dereq_,module,exports){
/**
 * @fileOverview Contains definition of the core graph object.
 */

/**
 * @example
 *  var graph = require('ngraph.graph')();
 *  graph.addNode(1);     // graph has one node.
 *  graph.addLink(2, 3);  // now graph contains three nodes and one link.
 *
 */
module.exports = createGraph;

var eventify = _dereq_('ngraph.events');

/**
 * Creates a new graph
 */
function createGraph(options) {
  // Graph structure is maintained as dictionary of nodes
  // and array of links. Each node has 'links' property which
  // hold all links related to that node. And general links
  // array is used to speed up all links enumeration. This is inefficient
  // in terms of memory, but simplifies coding.
  options = options || {};
  if (options.uniqueLinkId === undefined) {
    // Request each link id to be unique between same nodes. This negatively
    // impacts `addLink()` performance (O(n), where n - number of edges of each
    // vertex), but makes operations with multigraphs more accessible.
    options.uniqueLinkId = true;
  }

  var nodes = typeof Object.create === 'function' ? Object.create(null) : {},
    links = [],
    // Hash of multi-edges. Used to track ids of edges between same nodes
    multiEdges = {},
    nodesCount = 0,
    suspendEvents = 0,

    forEachNode = createNodeIterator(),
    createLink = options.uniqueLinkId ? createUniqueLink : createSingleLink,

    // Our graph API provides means to listen to graph changes. Users can subscribe
    // to be notified about changes in the graph by using `on` method. However
    // in some cases they don't use it. To avoid unnecessary memory consumption
    // we will not record graph changes until we have at least one subscriber.
    // Code below supports this optimization.
    //
    // Accumulates all changes made during graph updates.
    // Each change element contains:
    //  changeType - one of the strings: 'add', 'remove' or 'update';
    //  node - if change is related to node this property is set to changed graph's node;
    //  link - if change is related to link this property is set to changed graph's link;
    changes = [],
    recordLinkChange = noop,
    recordNodeChange = noop,
    enterModification = noop,
    exitModification = noop;

  // this is our public API:
  var graphPart = {
    /**
     * Adds node to the graph. If node with given id already exists in the graph
     * its data is extended with whatever comes in 'data' argument.
     *
     * @param nodeId the node's identifier. A string or number is preferred.
     * @param [data] additional data for the node being added. If node already
     *   exists its data object is augmented with the new one.
     *
     * @return {node} The newly added node or node with given id if it already exists.
     */
    addNode: addNode,

    /**
     * Adds a link to the graph. The function always create a new
     * link between two nodes. If one of the nodes does not exists
     * a new node is created.
     *
     * @param fromId link start node id;
     * @param toId link end node id;
     * @param [data] additional data to be set on the new link;
     *
     * @return {link} The newly created link
     */
    addLink: addLink,

    /**
     * Removes link from the graph. If link does not exist does nothing.
     *
     * @param link - object returned by addLink() or getLinks() methods.
     *
     * @returns true if link was removed; false otherwise.
     */
    removeLink: removeLink,

    /**
     * Removes node with given id from the graph. If node does not exist in the graph
     * does nothing.
     *
     * @param nodeId node's identifier passed to addNode() function.
     *
     * @returns true if node was removed; false otherwise.
     */
    removeNode: removeNode,

    /**
     * Gets node with given identifier. If node does not exist undefined value is returned.
     *
     * @param nodeId requested node identifier;
     *
     * @return {node} in with requested identifier or undefined if no such node exists.
     */
    getNode: getNode,

    /**
     * Gets number of nodes in this graph.
     *
     * @return number of nodes in the graph.
     */
    getNodesCount: function() {
      return nodesCount;
    },

    /**
     * Gets total number of links in the graph.
     */
    getLinksCount: function() {
      return links.length;
    },

    /**
     * Gets all links (inbound and outbound) from the node with given id.
     * If node with given id is not found null is returned.
     *
     * @param nodeId requested node identifier.
     *
     * @return Array of links from and to requested node if such node exists;
     *   otherwise null is returned.
     */
    getLinks: getLinks,

    /**
     * Invokes callback on each node of the graph.
     *
     * @param {Function(node)} callback Function to be invoked. The function
     *   is passed one argument: visited node.
     */
    forEachNode: forEachNode,

    /**
     * Invokes callback on every linked (adjacent) node to the given one.
     *
     * @param nodeId Identifier of the requested node.
     * @param {Function(node, link)} callback Function to be called on all linked nodes.
     *   The function is passed two parameters: adjacent node and link object itself.
     * @param oriented if true graph treated as oriented.
     */
    forEachLinkedNode: forEachLinkedNode,

    /**
     * Enumerates all links in the graph
     *
     * @param {Function(link)} callback Function to be called on all links in the graph.
     *   The function is passed one parameter: graph's link object.
     *
     * Link object contains at least the following fields:
     *  fromId - node id where link starts;
     *  toId - node id where link ends,
     *  data - additional data passed to graph.addLink() method.
     */
    forEachLink: forEachLink,

    /**
     * Suspend all notifications about graph changes until
     * endUpdate is called.
     */
    beginUpdate: enterModification,

    /**
     * Resumes all notifications about graph changes and fires
     * graph 'changed' event in case there are any pending changes.
     */
    endUpdate: exitModification,

    /**
     * Removes all nodes and links from the graph.
     */
    clear: clear,

    /**
     * Detects whether there is a link between two nodes.
     * Operation complexity is O(n) where n - number of links of a node.
     * NOTE: this function is synonim for getLink()
     *
     * @returns link if there is one. null otherwise.
     */
    hasLink: getLink,

    /**
     * Gets an edge between two nodes.
     * Operation complexity is O(n) where n - number of links of a node.
     *
     * @param {string} fromId link start identifier
     * @param {string} toId link end identifier
     *
     * @returns link if there is one. null otherwise.
     */
    getLink: getLink
  };

  // this will add `on()` and `fire()` methods.
  eventify(graphPart);

  monitorSubscribers();

  return graphPart;

  function monitorSubscribers() {
    var realOn = graphPart.on;

    // replace real `on` with our temporary on, which will trigger change
    // modification monitoring:
    graphPart.on = on;

    function on() {
      // now it's time to start tracking stuff:
      graphPart.beginUpdate = enterModification = enterModificationReal;
      graphPart.endUpdate = exitModification = exitModificationReal;
      recordLinkChange = recordLinkChangeReal;
      recordNodeChange = recordNodeChangeReal;

      // this will replace current `on` method with real pub/sub from `eventify`.
      graphPart.on = realOn;
      // delegate to real `on` handler:
      return realOn.apply(graphPart, arguments);
    }
  }

  function recordLinkChangeReal(link, changeType) {
    changes.push({
      link: link,
      changeType: changeType
    });
  }

  function recordNodeChangeReal(node, changeType) {
    changes.push({
      node: node,
      changeType: changeType
    });
  }

  function addNode(nodeId, data) {
    if (nodeId === undefined) {
      throw new Error('Invalid node identifier');
    }

    enterModification();

    var node = getNode(nodeId);
    if (!node) {
      node = new Node(nodeId);
      nodesCount++;
      recordNodeChange(node, 'add');
    } else {
      recordNodeChange(node, 'update');
    }

    node.data = data;

    nodes[nodeId] = node;

    exitModification();
    return node;
  }

  function getNode(nodeId) {
    return nodes[nodeId];
  }

  function removeNode(nodeId) {
    var node = getNode(nodeId);
    if (!node) {
      return false;
    }

    enterModification();

    if (node.links) {
      while (node.links.length) {
        var link = node.links[0];
        removeLink(link);
      }
    }

    delete nodes[nodeId];
    nodesCount--;

    recordNodeChange(node, 'remove');

    exitModification();

    return true;
  }


  function addLink(fromId, toId, data) {
    enterModification();

    var fromNode = getNode(fromId) || addNode(fromId);
    var toNode = getNode(toId) || addNode(toId);

    var link = createLink(fromId, toId, data);

    links.push(link);

    // TODO: this is not cool. On large graphs potentially would consume more memory.
    addLinkToNode(fromNode, link);
    if (fromId !== toId) {
      // make sure we are not duplicating links for self-loops
      addLinkToNode(toNode, link);
    }

    recordLinkChange(link, 'add');

    exitModification();

    return link;
  }

  function createSingleLink(fromId, toId, data) {
    var linkId = makeLinkId(fromId, toId);
    return new Link(fromId, toId, data, linkId);
  }

  function createUniqueLink(fromId, toId, data) {
    // TODO: Get rid of this method.
    var linkId = makeLinkId(fromId, toId);
    var isMultiEdge = multiEdges.hasOwnProperty(linkId);
    if (isMultiEdge || getLink(fromId, toId)) {
      if (!isMultiEdge) {
        multiEdges[linkId] = 0;
      }
      var suffix = '@' + (++multiEdges[linkId]);
      linkId = makeLinkId(fromId + suffix, toId + suffix);
    }

    return new Link(fromId, toId, data, linkId);
  }

  function getLinks(nodeId) {
    var node = getNode(nodeId);
    return node ? node.links : null;
  }

  function removeLink(link) {
    if (!link) {
      return false;
    }
    var idx = indexOfElementInArray(link, links);
    if (idx < 0) {
      return false;
    }

    enterModification();

    links.splice(idx, 1);

    var fromNode = getNode(link.fromId);
    var toNode = getNode(link.toId);

    if (fromNode) {
      idx = indexOfElementInArray(link, fromNode.links);
      if (idx >= 0) {
        fromNode.links.splice(idx, 1);
      }
    }

    if (toNode) {
      idx = indexOfElementInArray(link, toNode.links);
      if (idx >= 0) {
        toNode.links.splice(idx, 1);
      }
    }

    recordLinkChange(link, 'remove');

    exitModification();

    return true;
  }

  function getLink(fromNodeId, toNodeId) {
    // TODO: Use sorted links to speed this up
    var node = getNode(fromNodeId),
      i;
    if (!node || !node.links) {
      return null;
    }

    for (i = 0; i < node.links.length; ++i) {
      var link = node.links[i];
      if (link.fromId === fromNodeId && link.toId === toNodeId) {
        return link;
      }
    }

    return null; // no link.
  }

  function clear() {
    enterModification();
    forEachNode(function(node) {
      removeNode(node.id);
    });
    exitModification();
  }

  function forEachLink(callback) {
    var i, length;
    if (typeof callback === 'function') {
      for (i = 0, length = links.length; i < length; ++i) {
        callback(links[i]);
      }
    }
  }

  function forEachLinkedNode(nodeId, callback, oriented) {
    var node = getNode(nodeId);

    if (node && node.links && typeof callback === 'function') {
      if (oriented) {
        return forEachOrientedLink(node.links, nodeId, callback);
      } else {
        return forEachNonOrientedLink(node.links, nodeId, callback);
      }
    }
  }

  function forEachNonOrientedLink(links, nodeId, callback) {
    var quitFast;
    for (var i = 0; i < links.length; ++i) {
      var link = links[i];
      var linkedNodeId = link.fromId === nodeId ? link.toId : link.fromId;

      quitFast = callback(nodes[linkedNodeId], link);
      if (quitFast) {
        return true; // Client does not need more iterations. Break now.
      }
    }
  }

  function forEachOrientedLink(links, nodeId, callback) {
    var quitFast;
    for (var i = 0; i < links.length; ++i) {
      var link = links[i];
      if (link.fromId === nodeId) {
        quitFast = callback(nodes[link.toId], link);
        if (quitFast) {
          return true; // Client does not need more iterations. Break now.
        }
      }
    }
  }

  // we will not fire anything until users of this library explicitly call `on()`
  // method.
  function noop() {}

  // Enter, Exit modification allows bulk graph updates without firing events.
  function enterModificationReal() {
    suspendEvents += 1;
  }

  function exitModificationReal() {
    suspendEvents -= 1;
    if (suspendEvents === 0 && changes.length > 0) {
      graphPart.fire('changed', changes);
      changes.length = 0;
    }
  }

  function createNodeIterator() {
    // Object.keys iterator is 1.3x faster than `for in` loop.
    // See `https://github.com/anvaka/ngraph.graph/tree/bench-for-in-vs-obj-keys`
    // branch for perf test
    return Object.keys ? objectKeysIterator : forInIterator;
  }

  function objectKeysIterator(callback) {
    if (typeof callback !== 'function') {
      return;
    }

    var keys = Object.keys(nodes);
    for (var i = 0; i < keys.length; ++i) {
      if (callback(nodes[keys[i]])) {
        return true; // client doesn't want to proceed. Return.
      }
    }
  }

  function forInIterator(callback) {
    if (typeof callback !== 'function') {
      return;
    }
    var node;

    for (node in nodes) {
      if (callback(nodes[node])) {
        return true; // client doesn't want to proceed. Return.
      }
    }
  }
}

// need this for old browsers. Should this be a separate module?
function indexOfElementInArray(element, array) {
  if (!array) return -1;

  if (array.indexOf) {
    return array.indexOf(element);
  }

  var len = array.length,
    i;

  for (i = 0; i < len; i += 1) {
    if (array[i] === element) {
      return i;
    }
  }

  return -1;
}

/**
 * Internal structure to represent node;
 */
function Node(id) {
  this.id = id;
  this.links = null;
  this.data = null;
}

function addLinkToNode(node, link) {
  if (node.links) {
    node.links.push(link);
  } else {
    node.links = [link];
  }
}

/**
 * Internal structure to represent links;
 */
function Link(fromId, toId, data, id) {
  this.fromId = fromId;
  this.toId = toId;
  this.data = data;
  this.id = id;
}

function hashCode(str) {
  var hash = 0, i, chr, len;
  if (str.length == 0) return hash;
  for (i = 0, len = str.length; i < len; i++) {
    chr   = str.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
}

function makeLinkId(fromId, toId) {
  return hashCode(fromId.toString() + '👉 ' + toId.toString());
}

},{"ngraph.events":25}],25:[function(_dereq_,module,exports){
arguments[4][7][0].apply(exports,arguments)
},{"dup":7}],26:[function(_dereq_,module,exports){
module.exports = merge;

/**
 * Augments `target` with properties in `options`. Does not override
 * target's properties if they are defined and matches expected type in 
 * options
 *
 * @returns {Object} merged object
 */
function merge(target, options) {
  var key;
  if (!target) { target = {}; }
  if (options) {
    for (key in options) {
      if (options.hasOwnProperty(key)) {
        var targetHasIt = target.hasOwnProperty(key),
            optionsValueType = typeof options[key],
            shouldReplace = !targetHasIt || (typeof target[key] !== optionsValueType);

        if (shouldReplace) {
          target[key] = options[key];
        } else if (optionsValueType === 'object') {
          // go deep, don't care about loops here, we are simple API!:
          target[key] = merge(target[key], options[key]);
        }
      }
    }
  }

  return target;
}

},{}],27:[function(_dereq_,module,exports){
module.exports = {
  Body: Body,
  Vector2d: Vector2d,
  Body3d: Body3d,
  Vector3d: Vector3d
};

function Body(x, y) {
  this.pos = new Vector2d(x, y);
  this.prevPos = new Vector2d(x, y);
  this.force = new Vector2d();
  this.velocity = new Vector2d();
  this.mass = 1;
}

Body.prototype.setPosition = function (x, y) {
  this.prevPos.x = this.pos.x = x;
  this.prevPos.y = this.pos.y = y;
};

function Vector2d(x, y) {
  if (x && typeof x !== 'number') {
    // could be another vector
    this.x = typeof x.x === 'number' ? x.x : 0;
    this.y = typeof x.y === 'number' ? x.y : 0;
  } else {
    this.x = typeof x === 'number' ? x : 0;
    this.y = typeof y === 'number' ? y : 0;
  }
}

Vector2d.prototype.reset = function () {
  this.x = this.y = 0;
};

function Body3d(x, y, z) {
  this.pos = new Vector3d(x, y, z);
  this.prevPos = new Vector3d(x, y, z);
  this.force = new Vector3d();
  this.velocity = new Vector3d();
  this.mass = 1;
}

Body3d.prototype.setPosition = function (x, y, z) {
  this.prevPos.x = this.pos.x = x;
  this.prevPos.y = this.pos.y = y;
  this.prevPos.z = this.pos.z = z;
};

function Vector3d(x, y, z) {
  if (x && typeof x !== 'number') {
    // could be another vector
    this.x = typeof x.x === 'number' ? x.x : 0;
    this.y = typeof x.y === 'number' ? x.y : 0;
    this.z = typeof x.z === 'number' ? x.z : 0;
  } else {
    this.x = typeof x === 'number' ? x : 0;
    this.y = typeof y === 'number' ? y : 0;
    this.z = typeof z === 'number' ? z : 0;
  }
};

Vector3d.prototype.reset = function () {
  this.x = this.y = this.z = 0;
};

},{}],28:[function(_dereq_,module,exports){
/**
 * This is Barnes Hut simulation algorithm for 3d case. Implementation
 * is highly optimized (avoids recusion and gc pressure)
 *
 * http://www.cs.princeton.edu/courses/archive/fall03/cs126/assignments/barnes-hut.html
 *
 * NOTE: This module duplicates a lot of code from 2d case. Primary reason for
 * this is performance. Every time I tried to abstract away vector operations
 * I had negative impact on performance. So in this case I'm scarifying code
 * reuse in favor of speed
 */

module.exports = function(options) {
  options = options || {};
  options.gravity = typeof options.gravity === 'number' ? options.gravity : -1;
  options.theta = typeof options.theta === 'number' ? options.theta : 0.8;

  // we require deterministic randomness here
  var random = _dereq_('ngraph.random').random(1984),
    Node = _dereq_('./node'),
    InsertStack = _dereq_('./insertStack'),
    isSamePosition = _dereq_('./isSamePosition');

  var gravity = options.gravity,
    updateQueue = [],
    insertStack = new InsertStack(),
    theta = options.theta,

    nodesCache = [],
    currentInCache = 0,
    newNode = function() {
      // To avoid pressure on GC we reuse nodes.
      var node = nodesCache[currentInCache];
      if (node) {
        node.quad0 = null;
        node.quad4 = null;
        node.quad1 = null;
        node.quad5 = null;
        node.quad2 = null;
        node.quad6 = null;
        node.quad3 = null;
        node.quad7 = null;
        node.body = null;
        node.mass = node.massX = node.massY = node.massZ = 0;
        node.left = node.right = node.top = node.bottom = node.front = node.back = 0;
      } else {
        node = new Node();
        nodesCache[currentInCache] = node;
      }

      ++currentInCache;
      return node;
    },

    root = newNode(),

    // Inserts body to the tree
    insert = function(newBody) {
      insertStack.reset();
      insertStack.push(root, newBody);

      while (!insertStack.isEmpty()) {
        var stackItem = insertStack.pop(),
          node = stackItem.node,
          body = stackItem.body;

        if (!node.body) {
          // This is internal node. Update the total mass of the node and center-of-mass.
          var x = body.pos.x;
          var y = body.pos.y;
          var z = body.pos.z;
          node.mass += body.mass;
          node.massX += body.mass * x;
          node.massY += body.mass * y;
          node.massZ += body.mass * z;

          // Recursively insert the body in the appropriate quadrant.
          // But first find the appropriate quadrant.
          var quadIdx = 0, // Assume we are in the 0's quad.
            left = node.left,
            right = (node.right + left) / 2,
            top = node.top,
            bottom = (node.bottom + top) / 2,
            back = node.back,
            front = (node.front + back) / 2;

          if (x > right) { // somewhere in the eastern part.
            quadIdx += 1;
            var oldLeft = left;
            left = right;
            right = right + (right - oldLeft);
          }
          if (y > bottom) { // and in south.
            quadIdx += 2;
            var oldTop = top;
            top = bottom;
            bottom = bottom + (bottom - oldTop);
          }
          if (z > front) { // and in frontal part
            quadIdx += 4;
            var oldBack = back;
            back = front;
            front = back + (back - oldBack);
          }

          var child = getChild(node, quadIdx);
          if (!child) {
            // The node is internal but this quadrant is not taken. Add subnode to it.
            child = newNode();
            child.left = left;
            child.top = top;
            child.right = right;
            child.bottom = bottom;
            child.back = back;
            child.front = front;
            child.body = body;

            setChild(node, quadIdx, child);
          } else {
            // continue searching in this quadrant.
            insertStack.push(child, body);
          }
        } else {
          // We are trying to add to the leaf node.
          // We have to convert current leaf into internal node
          // and continue adding two nodes.
          var oldBody = node.body;
          node.body = null; // internal nodes do not carry bodies

          if (isSamePosition(oldBody.pos, body.pos)) {
            // Prevent infinite subdivision by bumping one node
            // anywhere in this quadrant
            var retriesCount = 3;
            do {
              var offset = random.nextDouble();
              var dx = (node.right - node.left) * offset;
              var dy = (node.bottom - node.top) * offset;
              var dz = (node.front - node.back) * offset;

              oldBody.pos.x = node.left + dx;
              oldBody.pos.y = node.top + dy;
              oldBody.pos.z = node.back + dz;
              retriesCount -= 1;
              // Make sure we don't bump it out of the box. If we do, next iteration should fix it
            } while (retriesCount > 0 && isSamePosition(oldBody.pos, body.pos));

            if (retriesCount === 0 && isSamePosition(oldBody.pos, body.pos)) {
              // This is very bad, we ran out of precision.
              // if we do not return from the method we'll get into
              // infinite loop here. So we sacrifice correctness of layout, and keep the app running
              // Next layout iteration should get larger bounding box in the first step and fix this
              return;
            }
          }
          // Next iteration should subdivide node further.
          insertStack.push(node, oldBody);
          insertStack.push(node, body);
        }
      }
    },

    update = function(sourceBody) {
      var queue = updateQueue,
        v,
        dx, dy, dz,
        r, fx = 0,
        fy = 0,
        fz = 0,
        queueLength = 1,
        shiftIdx = 0,
        pushIdx = 1;

      queue[0] = root;

      while (queueLength) {
        var node = queue[shiftIdx],
          body = node.body;

        queueLength -= 1;
        shiftIdx += 1;
        var differentBody = (body !== sourceBody);
        if (body && differentBody) {
          // If the current node is a leaf node (and it is not source body),
          // calculate the force exerted by the current node on body, and add this
          // amount to body's net force.
          dx = body.pos.x - sourceBody.pos.x;
          dy = body.pos.y - sourceBody.pos.y;
          dz = body.pos.z - sourceBody.pos.z;
          r = Math.sqrt(dx * dx + dy * dy + dz * dz);

          if (r === 0) {
            // Poor man's protection against zero distance.
            dx = (random.nextDouble() - 0.5) / 50;
            dy = (random.nextDouble() - 0.5) / 50;
            dz = (random.nextDouble() - 0.5) / 50;
            r = Math.sqrt(dx * dx + dy * dy + dz * dz);
          }

          // This is standard gravitation force calculation but we divide
          // by r^3 to save two operations when normalizing force vector.
          v = gravity * body.mass * sourceBody.mass / (r * r * r);
          fx += v * dx;
          fy += v * dy;
          fz += v * dz;
        } else if (differentBody) {
          // Otherwise, calculate the ratio s / r,  where s is the width of the region
          // represented by the internal node, and r is the distance between the body
          // and the node's center-of-mass
          dx = node.massX / node.mass - sourceBody.pos.x;
          dy = node.massY / node.mass - sourceBody.pos.y;
          dz = node.massZ / node.mass - sourceBody.pos.z;

          r = Math.sqrt(dx * dx + dy * dy + dz * dz);

          if (r === 0) {
            // Sorry about code duplication. I don't want to create many functions
            // right away. Just want to see performance first.
            dx = (random.nextDouble() - 0.5) / 50;
            dy = (random.nextDouble() - 0.5) / 50;
            dz = (random.nextDouble() - 0.5) / 50;
            r = Math.sqrt(dx * dx + dy * dy + dz * dz);
          }

          // If s / r < θ, treat this internal node as a single body, and calculate the
          // force it exerts on sourceBody, and add this amount to sourceBody's net force.
          if ((node.right - node.left) / r < theta) {
            // in the if statement above we consider node's width only
            // because the region was squarified during tree creation.
            // Thus there is no difference between using width or height.
            v = gravity * node.mass * sourceBody.mass / (r * r * r);
            fx += v * dx;
            fy += v * dy;
            fz += v * dz;
          } else {
            // Otherwise, run the procedure recursively on each of the current node's children.

            // I intentionally unfolded this loop, to save several CPU cycles.
            if (node.quad0) {
              queue[pushIdx] = node.quad0;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad1) {
              queue[pushIdx] = node.quad1;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad2) {
              queue[pushIdx] = node.quad2;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad3) {
              queue[pushIdx] = node.quad3;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad4) {
              queue[pushIdx] = node.quad4;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad5) {
              queue[pushIdx] = node.quad5;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad6) {
              queue[pushIdx] = node.quad6;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad7) {
              queue[pushIdx] = node.quad7;
              queueLength += 1;
              pushIdx += 1;
            }
          }
        }
      }

      sourceBody.force.x += fx;
      sourceBody.force.y += fy;
      sourceBody.force.z += fz;
    },

    insertBodies = function(bodies) {
      var x1 = Number.MAX_VALUE,
        y1 = Number.MAX_VALUE,
        z1 = Number.MAX_VALUE,
        x2 = Number.MIN_VALUE,
        y2 = Number.MIN_VALUE,
        z2 = Number.MIN_VALUE,
        i,
        max = bodies.length;

      // To reduce quad tree depth we are looking for exact bounding box of all particles.
      i = max;
      while (i--) {
        var pos = bodies[i].pos;
        var x = pos.x;
        var y = pos.y;
        var z = pos.z;
        if (x < x1) {
          x1 = x;
        }
        if (x > x2) {
          x2 = x;
        }
        if (y < y1) {
          y1 = y;
        }
        if (y > y2) {
          y2 = y;
        }
        if (z < z1) {
          z1 = z;
        }
        if (z > z2) {
          z2 = z;
        }
      }

      // Squarify the bounds.
      var maxSide = Math.max(x2 - x1, Math.max(y2 - y1, z2 - z1));

      x2 = x1 + maxSide;
      y2 = y1 + maxSide;
      z2 = z1 + maxSide;

      currentInCache = 0;
      root = newNode();
      root.left = x1;
      root.right = x2;
      root.top = y1;
      root.bottom = y2;
      root.back = z1;
      root.front = z2;

      i = max - 1;
      if (i > 0) {
        root.body = bodies[i];
      }
      while (i--) {
        insert(bodies[i], root);
      }
    };

  return {
    insertBodies: insertBodies,
    updateBodyForce: update,
    options: function(newOptions) {
      if (newOptions) {
        if (typeof newOptions.gravity === 'number') {
          gravity = newOptions.gravity;
        }
        if (typeof newOptions.theta === 'number') {
          theta = newOptions.theta;
        }

        return this;
      }

      return {
        gravity: gravity,
        theta: theta
      };
    }
  };
};

function getChild(node, idx) {
  if (idx === 0) return node.quad0;
  if (idx === 1) return node.quad1;
  if (idx === 2) return node.quad2;
  if (idx === 3) return node.quad3;
  if (idx === 4) return node.quad4;
  if (idx === 5) return node.quad5;
  if (idx === 6) return node.quad6;
  if (idx === 7) return node.quad7;
  return null;
}

function setChild(node, idx, child) {
  if (idx === 0) node.quad0 = child;
  else if (idx === 1) node.quad1 = child;
  else if (idx === 2) node.quad2 = child;
  else if (idx === 3) node.quad3 = child;
  else if (idx === 4) node.quad4 = child;
  else if (idx === 5) node.quad5 = child;
  else if (idx === 6) node.quad6 = child;
  else if (idx === 7) node.quad7 = child;
}

},{"./insertStack":29,"./isSamePosition":30,"./node":31,"ngraph.random":36}],29:[function(_dereq_,module,exports){
module.exports = InsertStack;

/**
 * Our implementation of QuadTree is non-recursive to avoid GC hit
 * This data structure represent stack of elements
 * which we are trying to insert into quad tree.
 */
function InsertStack () {
    this.stack = [];
    this.popIdx = 0;
}

InsertStack.prototype = {
    isEmpty: function() {
        return this.popIdx === 0;
    },
    push: function (node, body) {
        var item = this.stack[this.popIdx];
        if (!item) {
            // we are trying to avoid memory pressure: create new element
            // only when absolutely necessary
            this.stack[this.popIdx] = new InsertStackElement(node, body);
        } else {
            item.node = node;
            item.body = body;
        }
        ++this.popIdx;
    },
    pop: function () {
        if (this.popIdx > 0) {
            return this.stack[--this.popIdx];
        }
    },
    reset: function () {
        this.popIdx = 0;
    }
};

function InsertStackElement(node, body) {
    this.node = node; // QuadTree node
    this.body = body; // physical body which needs to be inserted to node
}

},{}],30:[function(_dereq_,module,exports){
module.exports = function isSamePosition(point1, point2) {
    var dx = Math.abs(point1.x - point2.x);
    var dy = Math.abs(point1.y - point2.y);
    var dz = Math.abs(point1.z - point2.z);

    return (dx < 1e-8 && dy < 1e-8 && dz < 1e-8);
};

},{}],31:[function(_dereq_,module,exports){
/**
 * Internal data structure to represent 3D QuadTree node
 */
module.exports = function Node() {
  // body stored inside this node. In quad tree only leaf nodes (by construction)
  // contain boides:
  this.body = null;

  // Child nodes are stored in quads. Each quad is presented by number:
  // Behind Z median:
  // 0 | 1
  // -----
  // 2 | 3
  // In front of Z median:
  // 4 | 5
  // -----
  // 6 | 7
  this.quad0 = null;
  this.quad1 = null;
  this.quad2 = null;
  this.quad3 = null;
  this.quad4 = null;
  this.quad5 = null;
  this.quad6 = null;
  this.quad7 = null;

  // Total mass of current node
  this.mass = 0;

  // Center of mass coordinates
  this.massX = 0;
  this.massY = 0;
  this.massZ = 0;

  // bounding box coordinates
  this.left = 0;
  this.top = 0;
  this.bottom = 0;
  this.right = 0;
  this.front = 0;
  this.back = 0;
};

},{}],32:[function(_dereq_,module,exports){
/**
 * This is Barnes Hut simulation algorithm for 2d case. Implementation
 * is highly optimized (avoids recusion and gc pressure)
 *
 * http://www.cs.princeton.edu/courses/archive/fall03/cs126/assignments/barnes-hut.html
 */

module.exports = function(options) {
  options = options || {};
  options.gravity = typeof options.gravity === 'number' ? options.gravity : -1;
  options.theta = typeof options.theta === 'number' ? options.theta : 0.8;

  // we require deterministic randomness here
  var random = _dereq_('ngraph.random').random(1984),
    Node = _dereq_('./node'),
    InsertStack = _dereq_('./insertStack'),
    isSamePosition = _dereq_('./isSamePosition');

  var gravity = options.gravity,
    updateQueue = [],
    insertStack = new InsertStack(),
    theta = options.theta,

    nodesCache = [],
    currentInCache = 0,
    newNode = function() {
      // To avoid pressure on GC we reuse nodes.
      var node = nodesCache[currentInCache];
      if (node) {
        node.quad0 = null;
        node.quad1 = null;
        node.quad2 = null;
        node.quad3 = null;
        node.body = null;
        node.mass = node.massX = node.massY = 0;
        node.left = node.right = node.top = node.bottom = 0;
      } else {
        node = new Node();
        nodesCache[currentInCache] = node;
      }

      ++currentInCache;
      return node;
    },

    root = newNode(),

    // Inserts body to the tree
    insert = function(newBody) {
      insertStack.reset();
      insertStack.push(root, newBody);

      while (!insertStack.isEmpty()) {
        var stackItem = insertStack.pop(),
          node = stackItem.node,
          body = stackItem.body;

        if (!node.body) {
          // This is internal node. Update the total mass of the node and center-of-mass.
          var x = body.pos.x;
          var y = body.pos.y;
          node.mass = node.mass + body.mass;
          node.massX = node.massX + body.mass * x;
          node.massY = node.massY + body.mass * y;

          // Recursively insert the body in the appropriate quadrant.
          // But first find the appropriate quadrant.
          var quadIdx = 0, // Assume we are in the 0's quad.
            left = node.left,
            right = (node.right + left) / 2,
            top = node.top,
            bottom = (node.bottom + top) / 2;

          if (x > right) { // somewhere in the eastern part.
            quadIdx = quadIdx + 1;
            var oldLeft = left;
            left = right;
            right = right + (right - oldLeft);
          }
          if (y > bottom) { // and in south.
            quadIdx = quadIdx + 2;
            var oldTop = top;
            top = bottom;
            bottom = bottom + (bottom - oldTop);
          }

          var child = getChild(node, quadIdx);
          if (!child) {
            // The node is internal but this quadrant is not taken. Add
            // subnode to it.
            child = newNode();
            child.left = left;
            child.top = top;
            child.right = right;
            child.bottom = bottom;
            child.body = body;

            setChild(node, quadIdx, child);
          } else {
            // continue searching in this quadrant.
            insertStack.push(child, body);
          }
        } else {
          // We are trying to add to the leaf node.
          // We have to convert current leaf into internal node
          // and continue adding two nodes.
          var oldBody = node.body;
          node.body = null; // internal nodes do not cary bodies

          if (isSamePosition(oldBody.pos, body.pos)) {
            // Prevent infinite subdivision by bumping one node
            // anywhere in this quadrant
            var retriesCount = 3;
            do {
              var offset = random.nextDouble();
              var dx = (node.right - node.left) * offset;
              var dy = (node.bottom - node.top) * offset;

              oldBody.pos.x = node.left + dx;
              oldBody.pos.y = node.top + dy;
              retriesCount -= 1;
              // Make sure we don't bump it out of the box. If we do, next iteration should fix it
            } while (retriesCount > 0 && isSamePosition(oldBody.pos, body.pos));

            if (retriesCount === 0 && isSamePosition(oldBody.pos, body.pos)) {
              // This is very bad, we ran out of precision.
              // if we do not return from the method we'll get into
              // infinite loop here. So we sacrifice correctness of layout, and keep the app running
              // Next layout iteration should get larger bounding box in the first step and fix this
              return;
            }
          }
          // Next iteration should subdivide node further.
          insertStack.push(node, oldBody);
          insertStack.push(node, body);
        }
      }
    },

    update = function(sourceBody) {
      var queue = updateQueue,
        v,
        dx,
        dy,
        r, fx = 0,
        fy = 0,
        queueLength = 1,
        shiftIdx = 0,
        pushIdx = 1;

      queue[0] = root;

      while (queueLength) {
        var node = queue[shiftIdx],
          body = node.body;

        queueLength -= 1;
        shiftIdx += 1;
        var differentBody = (body !== sourceBody);
        if (body && differentBody) {
          // If the current node is a leaf node (and it is not source body),
          // calculate the force exerted by the current node on body, and add this
          // amount to body's net force.
          dx = body.pos.x - sourceBody.pos.x;
          dy = body.pos.y - sourceBody.pos.y;
          r = Math.sqrt(dx * dx + dy * dy);

          if (r === 0) {
            // Poor man's protection against zero distance.
            dx = (random.nextDouble() - 0.5) / 50;
            dy = (random.nextDouble() - 0.5) / 50;
            r = Math.sqrt(dx * dx + dy * dy);
          }

          // This is standard gravition force calculation but we divide
          // by r^3 to save two operations when normalizing force vector.
          v = gravity * body.mass * sourceBody.mass / (r * r * r);
          fx += v * dx;
          fy += v * dy;
        } else if (differentBody) {
          // Otherwise, calculate the ratio s / r,  where s is the width of the region
          // represented by the internal node, and r is the distance between the body
          // and the node's center-of-mass
          dx = node.massX / node.mass - sourceBody.pos.x;
          dy = node.massY / node.mass - sourceBody.pos.y;
          r = Math.sqrt(dx * dx + dy * dy);

          if (r === 0) {
            // Sorry about code duplucation. I don't want to create many functions
            // right away. Just want to see performance first.
            dx = (random.nextDouble() - 0.5) / 50;
            dy = (random.nextDouble() - 0.5) / 50;
            r = Math.sqrt(dx * dx + dy * dy);
          }
          // If s / r < θ, treat this internal node as a single body, and calculate the
          // force it exerts on sourceBody, and add this amount to sourceBody's net force.
          if ((node.right - node.left) / r < theta) {
            // in the if statement above we consider node's width only
            // because the region was squarified during tree creation.
            // Thus there is no difference between using width or height.
            v = gravity * node.mass * sourceBody.mass / (r * r * r);
            fx += v * dx;
            fy += v * dy;
          } else {
            // Otherwise, run the procedure recursively on each of the current node's children.

            // I intentionally unfolded this loop, to save several CPU cycles.
            if (node.quad0) {
              queue[pushIdx] = node.quad0;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad1) {
              queue[pushIdx] = node.quad1;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad2) {
              queue[pushIdx] = node.quad2;
              queueLength += 1;
              pushIdx += 1;
            }
            if (node.quad3) {
              queue[pushIdx] = node.quad3;
              queueLength += 1;
              pushIdx += 1;
            }
          }
        }
      }

      sourceBody.force.x += fx;
      sourceBody.force.y += fy;
    },

    insertBodies = function(bodies) {
      var x1 = Number.MAX_VALUE,
        y1 = Number.MAX_VALUE,
        x2 = Number.MIN_VALUE,
        y2 = Number.MIN_VALUE,
        i,
        max = bodies.length;

      // To reduce quad tree depth we are looking for exact bounding box of all particles.
      i = max;
      while (i--) {
        var x = bodies[i].pos.x;
        var y = bodies[i].pos.y;
        if (x < x1) {
          x1 = x;
        }
        if (x > x2) {
          x2 = x;
        }
        if (y < y1) {
          y1 = y;
        }
        if (y > y2) {
          y2 = y;
        }
      }

      // Squarify the bounds.
      var dx = x2 - x1,
        dy = y2 - y1;
      if (dx > dy) {
        y2 = y1 + dx;
      } else {
        x2 = x1 + dy;
      }

      currentInCache = 0;
      root = newNode();
      root.left = x1;
      root.right = x2;
      root.top = y1;
      root.bottom = y2;

      i = max - 1;
      if (i > 0) {
        root.body = bodies[i];
      }
      while (i--) {
        insert(bodies[i], root);
      }
    };

  return {
    insertBodies: insertBodies,
    updateBodyForce: update,
    options: function(newOptions) {
      if (newOptions) {
        if (typeof newOptions.gravity === 'number') {
          gravity = newOptions.gravity;
        }
        if (typeof newOptions.theta === 'number') {
          theta = newOptions.theta;
        }

        return this;
      }

      return {
        gravity: gravity,
        theta: theta
      };
    }
  };
};

function getChild(node, idx) {
  if (idx === 0) return node.quad0;
  if (idx === 1) return node.quad1;
  if (idx === 2) return node.quad2;
  if (idx === 3) return node.quad3;
  return null;
}

function setChild(node, idx, child) {
  if (idx === 0) node.quad0 = child;
  else if (idx === 1) node.quad1 = child;
  else if (idx === 2) node.quad2 = child;
  else if (idx === 3) node.quad3 = child;
}

},{"./insertStack":33,"./isSamePosition":34,"./node":35,"ngraph.random":36}],33:[function(_dereq_,module,exports){
module.exports = InsertStack;

/**
 * Our implmentation of QuadTree is non-recursive to avoid GC hit
 * This data structure represent stack of elements
 * which we are trying to insert into quad tree.
 */
function InsertStack () {
    this.stack = [];
    this.popIdx = 0;
}

InsertStack.prototype = {
    isEmpty: function() {
        return this.popIdx === 0;
    },
    push: function (node, body) {
        var item = this.stack[this.popIdx];
        if (!item) {
            // we are trying to avoid memory pressue: create new element
            // only when absolutely necessary
            this.stack[this.popIdx] = new InsertStackElement(node, body);
        } else {
            item.node = node;
            item.body = body;
        }
        ++this.popIdx;
    },
    pop: function () {
        if (this.popIdx > 0) {
            return this.stack[--this.popIdx];
        }
    },
    reset: function () {
        this.popIdx = 0;
    }
};

function InsertStackElement(node, body) {
    this.node = node; // QuadTree node
    this.body = body; // physical body which needs to be inserted to node
}

},{}],34:[function(_dereq_,module,exports){
module.exports = function isSamePosition(point1, point2) {
    var dx = Math.abs(point1.x - point2.x);
    var dy = Math.abs(point1.y - point2.y);

    return (dx < 1e-8 && dy < 1e-8);
};

},{}],35:[function(_dereq_,module,exports){
/**
 * Internal data structure to represent 2D QuadTree node
 */
module.exports = function Node() {
  // body stored inside this node. In quad tree only leaf nodes (by construction)
  // contain boides:
  this.body = null;

  // Child nodes are stored in quads. Each quad is presented by number:
  // 0 | 1
  // -----
  // 2 | 3
  this.quad0 = null;
  this.quad1 = null;
  this.quad2 = null;
  this.quad3 = null;

  // Total mass of current node
  this.mass = 0;

  // Center of mass coordinates
  this.massX = 0;
  this.massY = 0;

  // bounding box coordinates
  this.left = 0;
  this.top = 0;
  this.bottom = 0;
  this.right = 0;
};

},{}],36:[function(_dereq_,module,exports){
module.exports = {
  random: random,
  randomIterator: randomIterator
};

/**
 * Creates seeded PRNG with two methods:
 *   next() and nextDouble()
 */
function random(inputSeed) {
  var seed = typeof inputSeed === 'number' ? inputSeed : (+ new Date());
  var randomFunc = function() {
      // Robert Jenkins' 32 bit integer hash function.
      seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;
      seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;
      seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;
      seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;
      seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;
      seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;
      return (seed & 0xfffffff) / 0x10000000;
  };

  return {
      /**
       * Generates random integer number in the range from 0 (inclusive) to maxValue (exclusive)
       *
       * @param maxValue Number REQUIRED. Ommitting this number will result in NaN values from PRNG.
       */
      next : function (maxValue) {
          return Math.floor(randomFunc() * maxValue);
      },

      /**
       * Generates random double number in the range from 0 (inclusive) to 1 (exclusive)
       * This function is the same as Math.random() (except that it could be seeded)
       */
      nextDouble : function () {
          return randomFunc();
      }
  };
}

/*
 * Creates iterator over array, which returns items of array in random order
 * Time complexity is guaranteed to be O(n);
 */
function randomIterator(array, customRandom) {
    var localRandom = customRandom || random();
    if (typeof localRandom.next !== 'function') {
      throw new Error('customRandom does not match expected API: next() function is missing');
    }

    return {
        forEach : function (callback) {
            var i, j, t;
            for (i = array.length - 1; i > 0; --i) {
                j = localRandom.next(i + 1); // i inclusive
                t = array[j];
                array[j] = array[i];
                array[i] = t;

                callback(t);
            }

            if (array.length) {
                callback(array[0]);
            }
        },

        /**
         * Shuffles array randomly, in place.
         */
        shuffle : function () {
            var i, j, t;
            for (i = array.length - 1; i > 0; --i) {
                j = localRandom.next(i + 1); // i inclusive
                t = array[j];
                array[j] = array[i];
                array[i] = t;
            }

            return array;
        }
    };
}

},{}],37:[function(_dereq_,module,exports){
module.exports = save;

function save(graph, customNodeTransform, customLinkTransform) {
  // Object contains `nodes` and `links` arrays.
  var result = {
    nodes: [],
    links: []
  };

  var nodeTransform = customNodeTransform || defaultTransformForNode;
  var linkTransform = customLinkTransform || defaultTransformForLink;

  graph.forEachNode(saveNode);
  graph.forEachLink(saveLink);

  return JSON.stringify(result);

  function saveNode(node) {
    // Each node of the graph is processed to take only required fields
    // `id` and `data`
    result.nodes.push(nodeTransform(node));
  }

  function saveLink(link) {
    // Each link of the graph is also processed to take `fromId`, `toId` and
    // `data`
    result.links.push(linkTransform(link));
  }

  function defaultTransformForNode(node) {
    var result = {
      id: node.id
    };
    // We don't want to store undefined fields when it's not necessary:
    if (node.data !== undefined) {
      result.data = node.data;
    }

    return result;
  }

  function defaultTransformForLink(link) {
    var result = {
      fromId: link.fromId,
      toId: link.toId,
    };

    if (link.data !== undefined) {
      result.data = link.data;
    }

    return result;
  }
}

},{}],38:[function(_dereq_,module,exports){
// shim for using process in browser

var process = module.exports = {};
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = setTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    clearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        setTimeout(drainQueue, 0);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],39:[function(_dereq_,module,exports){
//     Underscore.js 1.8.3
//     http://underscorejs.org
//     (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
//     Underscore may be freely distributed under the MIT license.

(function() {

  // Baseline setup
  // --------------

  // Establish the root object, `window` in the browser, or `exports` on the server.
  var root = this;

  // Save the previous value of the `_` variable.
  var previousUnderscore = root._;

  // Save bytes in the minified (but not gzipped) version:
  var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

  // Create quick reference variables for speed access to core prototypes.
  var
    push             = ArrayProto.push,
    slice            = ArrayProto.slice,
    toString         = ObjProto.toString,
    hasOwnProperty   = ObjProto.hasOwnProperty;

  // All **ECMAScript 5** native function implementations that we hope to use
  // are declared here.
  var
    nativeIsArray      = Array.isArray,
    nativeKeys         = Object.keys,
    nativeBind         = FuncProto.bind,
    nativeCreate       = Object.create;

  // Naked function reference for surrogate-prototype-swapping.
  var Ctor = function(){};

  // Create a safe reference to the Underscore object for use below.
  var _ = function(obj) {
    if (obj instanceof _) return obj;
    if (!(this instanceof _)) return new _(obj);
    this._wrapped = obj;
  };

  // Export the Underscore object for **Node.js**, with
  // backwards-compatibility for the old `require()` API. If we're in
  // the browser, add `_` as a global object.
  if (typeof exports !== 'undefined') {
    if (typeof module !== 'undefined' && module.exports) {
      exports = module.exports = _;
    }
    exports._ = _;
  } else {
    root._ = _;
  }

  // Current version.
  _.VERSION = '1.8.3';

  // Internal function that returns an efficient (for current engines) version
  // of the passed-in callback, to be repeatedly applied in other Underscore
  // functions.
  var optimizeCb = function(func, context, argCount) {
    if (context === void 0) return func;
    switch (argCount == null ? 3 : argCount) {
      case 1: return function(value) {
        return func.call(context, value);
      };
      case 2: return function(value, other) {
        return func.call(context, value, other);
      };
      case 3: return function(value, index, collection) {
        return func.call(context, value, index, collection);
      };
      case 4: return function(accumulator, value, index, collection) {
        return func.call(context, accumulator, value, index, collection);
      };
    }
    return function() {
      return func.apply(context, arguments);
    };
  };

  // A mostly-internal function to generate callbacks that can be applied
  // to each element in a collection, returning the desired result — either
  // identity, an arbitrary callback, a property matcher, or a property accessor.
  var cb = function(value, context, argCount) {
    if (value == null) return _.identity;
    if (_.isFunction(value)) return optimizeCb(value, context, argCount);
    if (_.isObject(value)) return _.matcher(value);
    return _.property(value);
  };
  _.iteratee = function(value, context) {
    return cb(value, context, Infinity);
  };

  // An internal function for creating assigner functions.
  var createAssigner = function(keysFunc, undefinedOnly) {
    return function(obj) {
      var length = arguments.length;
      if (length < 2 || obj == null) return obj;
      for (var index = 1; index < length; index++) {
        var source = arguments[index],
            keys = keysFunc(source),
            l = keys.length;
        for (var i = 0; i < l; i++) {
          var key = keys[i];
          if (!undefinedOnly || obj[key] === void 0) obj[key] = source[key];
        }
      }
      return obj;
    };
  };

  // An internal function for creating a new object that inherits from another.
  var baseCreate = function(prototype) {
    if (!_.isObject(prototype)) return {};
    if (nativeCreate) return nativeCreate(prototype);
    Ctor.prototype = prototype;
    var result = new Ctor;
    Ctor.prototype = null;
    return result;
  };

  var property = function(key) {
    return function(obj) {
      return obj == null ? void 0 : obj[key];
    };
  };

  // Helper for collection methods to determine whether a collection
  // should be iterated as an array or as an object
  // Related: http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
  // Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
  var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;
  var getLength = property('length');
  var isArrayLike = function(collection) {
    var length = getLength(collection);
    return typeof length == 'number' && length >= 0 && length <= MAX_ARRAY_INDEX;
  };

  // Collection Functions
  // --------------------

  // The cornerstone, an `each` implementation, aka `forEach`.
  // Handles raw objects in addition to array-likes. Treats all
  // sparse array-likes as if they were dense.
  _.each = _.forEach = function(obj, iteratee, context) {
    iteratee = optimizeCb(iteratee, context);
    var i, length;
    if (isArrayLike(obj)) {
      for (i = 0, length = obj.length; i < length; i++) {
        iteratee(obj[i], i, obj);
      }
    } else {
      var keys = _.keys(obj);
      for (i = 0, length = keys.length; i < length; i++) {
        iteratee(obj[keys[i]], keys[i], obj);
      }
    }
    return obj;
  };

  // Return the results of applying the iteratee to each element.
  _.map = _.collect = function(obj, iteratee, context) {
    iteratee = cb(iteratee, context);
    var keys = !isArrayLike(obj) && _.keys(obj),
        length = (keys || obj).length,
        results = Array(length);
    for (var index = 0; index < length; index++) {
      var currentKey = keys ? keys[index] : index;
      results[index] = iteratee(obj[currentKey], currentKey, obj);
    }
    return results;
  };

  // Create a reducing function iterating left or right.
  function createReduce(dir) {
    // Optimized iterator function as using arguments.length
    // in the main function will deoptimize the, see #1991.
    function iterator(obj, iteratee, memo, keys, index, length) {
      for (; index >= 0 && index < length; index += dir) {
        var currentKey = keys ? keys[index] : index;
        memo = iteratee(memo, obj[currentKey], currentKey, obj);
      }
      return memo;
    }

    return function(obj, iteratee, memo, context) {
      iteratee = optimizeCb(iteratee, context, 4);
      var keys = !isArrayLike(obj) && _.keys(obj),
          length = (keys || obj).length,
          index = dir > 0 ? 0 : length - 1;
      // Determine the initial value if none is provided.
      if (arguments.length < 3) {
        memo = obj[keys ? keys[index] : index];
        index += dir;
      }
      return iterator(obj, iteratee, memo, keys, index, length);
    };
  }

  // **Reduce** builds up a single result from a list of values, aka `inject`,
  // or `foldl`.
  _.reduce = _.foldl = _.inject = createReduce(1);

  // The right-associative version of reduce, also known as `foldr`.
  _.reduceRight = _.foldr = createReduce(-1);

  // Return the first value which passes a truth test. Aliased as `detect`.
  _.find = _.detect = function(obj, predicate, context) {
    var key;
    if (isArrayLike(obj)) {
      key = _.findIndex(obj, predicate, context);
    } else {
      key = _.findKey(obj, predicate, context);
    }
    if (key !== void 0 && key !== -1) return obj[key];
  };

  // Return all the elements that pass a truth test.
  // Aliased as `select`.
  _.filter = _.select = function(obj, predicate, context) {
    var results = [];
    predicate = cb(predicate, context);
    _.each(obj, function(value, index, list) {
      if (predicate(value, index, list)) results.push(value);
    });
    return results;
  };

  // Return all the elements for which a truth test fails.
  _.reject = function(obj, predicate, context) {
    return _.filter(obj, _.negate(cb(predicate)), context);
  };

  // Determine whether all of the elements match a truth test.
  // Aliased as `all`.
  _.every = _.all = function(obj, predicate, context) {
    predicate = cb(predicate, context);
    var keys = !isArrayLike(obj) && _.keys(obj),
        length = (keys || obj).length;
    for (var index = 0; index < length; index++) {
      var currentKey = keys ? keys[index] : index;
      if (!predicate(obj[currentKey], currentKey, obj)) return false;
    }
    return true;
  };

  // Determine if at least one element in the object matches a truth test.
  // Aliased as `any`.
  _.some = _.any = function(obj, predicate, context) {
    predicate = cb(predicate, context);
    var keys = !isArrayLike(obj) && _.keys(obj),
        length = (keys || obj).length;
    for (var index = 0; index < length; index++) {
      var currentKey = keys ? keys[index] : index;
      if (predicate(obj[currentKey], currentKey, obj)) return true;
    }
    return false;
  };

  // Determine if the array or object contains a given item (using `===`).
  // Aliased as `includes` and `include`.
  _.contains = _.includes = _.include = function(obj, item, fromIndex, guard) {
    if (!isArrayLike(obj)) obj = _.values(obj);
    if (typeof fromIndex != 'number' || guard) fromIndex = 0;
    return _.indexOf(obj, item, fromIndex) >= 0;
  };

  // Invoke a method (with arguments) on every item in a collection.
  _.invoke = function(obj, method) {
    var args = slice.call(arguments, 2);
    var isFunc = _.isFunction(method);
    return _.map(obj, function(value) {
      var func = isFunc ? method : value[method];
      return func == null ? func : func.apply(value, args);
    });
  };

  // Convenience version of a common use case of `map`: fetching a property.
  _.pluck = function(obj, key) {
    return _.map(obj, _.property(key));
  };

  // Convenience version of a common use case of `filter`: selecting only objects
  // containing specific `key:value` pairs.
  _.where = function(obj, attrs) {
    return _.filter(obj, _.matcher(attrs));
  };

  // Convenience version of a common use case of `find`: getting the first object
  // containing specific `key:value` pairs.
  _.findWhere = function(obj, attrs) {
    return _.find(obj, _.matcher(attrs));
  };

  // Return the maximum element (or element-based computation).
  _.max = function(obj, iteratee, context) {
    var result = -Infinity, lastComputed = -Infinity,
        value, computed;
    if (iteratee == null && obj != null) {
      obj = isArrayLike(obj) ? obj : _.values(obj);
      for (var i = 0, length = obj.length; i < length; i++) {
        value = obj[i];
        if (value > result) {
          result = value;
        }
      }
    } else {
      iteratee = cb(iteratee, context);
      _.each(obj, function(value, index, list) {
        computed = iteratee(value, index, list);
        if (computed > lastComputed || computed === -Infinity && result === -Infinity) {
          result = value;
          lastComputed = computed;
        }
      });
    }
    return result;
  };

  // Return the minimum element (or element-based computation).
  _.min = function(obj, iteratee, context) {
    var result = Infinity, lastComputed = Infinity,
        value, computed;
    if (iteratee == null && obj != null) {
      obj = isArrayLike(obj) ? obj : _.values(obj);
      for (var i = 0, length = obj.length; i < length; i++) {
        value = obj[i];
        if (value < result) {
          result = value;
        }
      }
    } else {
      iteratee = cb(iteratee, context);
      _.each(obj, function(value, index, list) {
        computed = iteratee(value, index, list);
        if (computed < lastComputed || computed === Infinity && result === Infinity) {
          result = value;
          lastComputed = computed;
        }
      });
    }
    return result;
  };

  // Shuffle a collection, using the modern version of the
  // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
  _.shuffle = function(obj) {
    var set = isArrayLike(obj) ? obj : _.values(obj);
    var length = set.length;
    var shuffled = Array(length);
    for (var index = 0, rand; index < length; index++) {
      rand = _.random(0, index);
      if (rand !== index) shuffled[index] = shuffled[rand];
      shuffled[rand] = set[index];
    }
    return shuffled;
  };

  // Sample **n** random values from a collection.
  // If **n** is not specified, returns a single random element.
  // The internal `guard` argument allows it to work with `map`.
  _.sample = function(obj, n, guard) {
    if (n == null || guard) {
      if (!isArrayLike(obj)) obj = _.values(obj);
      return obj[_.random(obj.length - 1)];
    }
    return _.shuffle(obj).slice(0, Math.max(0, n));
  };

  // Sort the object's values by a criterion produced by an iteratee.
  _.sortBy = function(obj, iteratee, context) {
    iteratee = cb(iteratee, context);
    return _.pluck(_.map(obj, function(value, index, list) {
      return {
        value: value,
        index: index,
        criteria: iteratee(value, index, list)
      };
    }).sort(function(left, right) {
      var a = left.criteria;
      var b = right.criteria;
      if (a !== b) {
        if (a > b || a === void 0) return 1;
        if (a < b || b === void 0) return -1;
      }
      return left.index - right.index;
    }), 'value');
  };

  // An internal function used for aggregate "group by" operations.
  var group = function(behavior) {
    return function(obj, iteratee, context) {
      var result = {};
      iteratee = cb(iteratee, context);
      _.each(obj, function(value, index) {
        var key = iteratee(value, index, obj);
        behavior(result, value, key);
      });
      return result;
    };
  };

  // Groups the object's values by a criterion. Pass either a string attribute
  // to group by, or a function that returns the criterion.
  _.groupBy = group(function(result, value, key) {
    if (_.has(result, key)) result[key].push(value); else result[key] = [value];
  });

  // Indexes the object's values by a criterion, similar to `groupBy`, but for
  // when you know that your index values will be unique.
  _.indexBy = group(function(result, value, key) {
    result[key] = value;
  });

  // Counts instances of an object that group by a certain criterion. Pass
  // either a string attribute to count by, or a function that returns the
  // criterion.
  _.countBy = group(function(result, value, key) {
    if (_.has(result, key)) result[key]++; else result[key] = 1;
  });

  // Safely create a real, live array from anything iterable.
  _.toArray = function(obj) {
    if (!obj) return [];
    if (_.isArray(obj)) return slice.call(obj);
    if (isArrayLike(obj)) return _.map(obj, _.identity);
    return _.values(obj);
  };

  // Return the number of elements in an object.
  _.size = function(obj) {
    if (obj == null) return 0;
    return isArrayLike(obj) ? obj.length : _.keys(obj).length;
  };

  // Split a collection into two arrays: one whose elements all satisfy the given
  // predicate, and one whose elements all do not satisfy the predicate.
  _.partition = function(obj, predicate, context) {
    predicate = cb(predicate, context);
    var pass = [], fail = [];
    _.each(obj, function(value, key, obj) {
      (predicate(value, key, obj) ? pass : fail).push(value);
    });
    return [pass, fail];
  };

  // Array Functions
  // ---------------

  // Get the first element of an array. Passing **n** will return the first N
  // values in the array. Aliased as `head` and `take`. The **guard** check
  // allows it to work with `_.map`.
  _.first = _.head = _.take = function(array, n, guard) {
    if (array == null) return void 0;
    if (n == null || guard) return array[0];
    return _.initial(array, array.length - n);
  };

  // Returns everything but the last entry of the array. Especially useful on
  // the arguments object. Passing **n** will return all the values in
  // the array, excluding the last N.
  _.initial = function(array, n, guard) {
    return slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));
  };

  // Get the last element of an array. Passing **n** will return the last N
  // values in the array.
  _.last = function(array, n, guard) {
    if (array == null) return void 0;
    if (n == null || guard) return array[array.length - 1];
    return _.rest(array, Math.max(0, array.length - n));
  };

  // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
  // Especially useful on the arguments object. Passing an **n** will return
  // the rest N values in the array.
  _.rest = _.tail = _.drop = function(array, n, guard) {
    return slice.call(array, n == null || guard ? 1 : n);
  };

  // Trim out all falsy values from an array.
  _.compact = function(array) {
    return _.filter(array, _.identity);
  };

  // Internal implementation of a recursive `flatten` function.
  var flatten = function(input, shallow, strict, startIndex) {
    var output = [], idx = 0;
    for (var i = startIndex || 0, length = getLength(input); i < length; i++) {
      var value = input[i];
      if (isArrayLike(value) && (_.isArray(value) || _.isArguments(value))) {
        //flatten current level of array or arguments object
        if (!shallow) value = flatten(value, shallow, strict);
        var j = 0, len = value.length;
        output.length += len;
        while (j < len) {
          output[idx++] = value[j++];
        }
      } else if (!strict) {
        output[idx++] = value;
      }
    }
    return output;
  };

  // Flatten out an array, either recursively (by default), or just one level.
  _.flatten = function(array, shallow) {
    return flatten(array, shallow, false);
  };

  // Return a version of the array that does not contain the specified value(s).
  _.without = function(array) {
    return _.difference(array, slice.call(arguments, 1));
  };

  // Produce a duplicate-free version of the array. If the array has already
  // been sorted, you have the option of using a faster algorithm.
  // Aliased as `unique`.
  _.uniq = _.unique = function(array, isSorted, iteratee, context) {
    if (!_.isBoolean(isSorted)) {
      context = iteratee;
      iteratee = isSorted;
      isSorted = false;
    }
    if (iteratee != null) iteratee = cb(iteratee, context);
    var result = [];
    var seen = [];
    for (var i = 0, length = getLength(array); i < length; i++) {
      var value = array[i],
          computed = iteratee ? iteratee(value, i, array) : value;
      if (isSorted) {
        if (!i || seen !== computed) result.push(value);
        seen = computed;
      } else if (iteratee) {
        if (!_.contains(seen, computed)) {
          seen.push(computed);
          result.push(value);
        }
      } else if (!_.contains(result, value)) {
        result.push(value);
      }
    }
    return result;
  };

  // Produce an array that contains the union: each distinct element from all of
  // the passed-in arrays.
  _.union = function() {
    return _.uniq(flatten(arguments, true, true));
  };

  // Produce an array that contains every item shared between all the
  // passed-in arrays.
  _.intersection = function(array) {
    var result = [];
    var argsLength = arguments.length;
    for (var i = 0, length = getLength(array); i < length; i++) {
      var item = array[i];
      if (_.contains(result, item)) continue;
      for (var j = 1; j < argsLength; j++) {
        if (!_.contains(arguments[j], item)) break;
      }
      if (j === argsLength) result.push(item);
    }
    return result;
  };

  // Take the difference between one array and a number of other arrays.
  // Only the elements present in just the first array will remain.
  _.difference = function(array) {
    var rest = flatten(arguments, true, true, 1);
    return _.filter(array, function(value){
      return !_.contains(rest, value);
    });
  };

  // Zip together multiple lists into a single array -- elements that share
  // an index go together.
  _.zip = function() {
    return _.unzip(arguments);
  };

  // Complement of _.zip. Unzip accepts an array of arrays and groups
  // each array's elements on shared indices
  _.unzip = function(array) {
    var length = array && _.max(array, getLength).length || 0;
    var result = Array(length);

    for (var index = 0; index < length; index++) {
      result[index] = _.pluck(array, index);
    }
    return result;
  };

  // Converts lists into objects. Pass either a single array of `[key, value]`
  // pairs, or two parallel arrays of the same length -- one of keys, and one of
  // the corresponding values.
  _.object = function(list, values) {
    var result = {};
    for (var i = 0, length = getLength(list); i < length; i++) {
      if (values) {
        result[list[i]] = values[i];
      } else {
        result[list[i][0]] = list[i][1];
      }
    }
    return result;
  };

  // Generator function to create the findIndex and findLastIndex functions
  function createPredicateIndexFinder(dir) {
    return function(array, predicate, context) {
      predicate = cb(predicate, context);
      var length = getLength(array);
      var index = dir > 0 ? 0 : length - 1;
      for (; index >= 0 && index < length; index += dir) {
        if (predicate(array[index], index, array)) return index;
      }
      return -1;
    };
  }

  // Returns the first index on an array-like that passes a predicate test
  _.findIndex = createPredicateIndexFinder(1);
  _.findLastIndex = createPredicateIndexFinder(-1);

  // Use a comparator function to figure out the smallest index at which
  // an object should be inserted so as to maintain order. Uses binary search.
  _.sortedIndex = function(array, obj, iteratee, context) {
    iteratee = cb(iteratee, context, 1);
    var value = iteratee(obj);
    var low = 0, high = getLength(array);
    while (low < high) {
      var mid = Math.floor((low + high) / 2);
      if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;
    }
    return low;
  };

  // Generator function to create the indexOf and lastIndexOf functions
  function createIndexFinder(dir, predicateFind, sortedIndex) {
    return function(array, item, idx) {
      var i = 0, length = getLength(array);
      if (typeof idx == 'number') {
        if (dir > 0) {
            i = idx >= 0 ? idx : Math.max(idx + length, i);
        } else {
            length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
        }
      } else if (sortedIndex && idx && length) {
        idx = sortedIndex(array, item);
        return array[idx] === item ? idx : -1;
      }
      if (item !== item) {
        idx = predicateFind(slice.call(array, i, length), _.isNaN);
        return idx >= 0 ? idx + i : -1;
      }
      for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
        if (array[idx] === item) return idx;
      }
      return -1;
    };
  }

  // Return the position of the first occurrence of an item in an array,
  // or -1 if the item is not included in the array.
  // If the array is large and already in sort order, pass `true`
  // for **isSorted** to use binary search.
  _.indexOf = createIndexFinder(1, _.findIndex, _.sortedIndex);
  _.lastIndexOf = createIndexFinder(-1, _.findLastIndex);

  // Generate an integer Array containing an arithmetic progression. A port of
  // the native Python `range()` function. See
  // [the Python documentation](http://docs.python.org/library/functions.html#range).
  _.range = function(start, stop, step) {
    if (stop == null) {
      stop = start || 0;
      start = 0;
    }
    step = step || 1;

    var length = Math.max(Math.ceil((stop - start) / step), 0);
    var range = Array(length);

    for (var idx = 0; idx < length; idx++, start += step) {
      range[idx] = start;
    }

    return range;
  };

  // Function (ahem) Functions
  // ------------------

  // Determines whether to execute a function as a constructor
  // or a normal function with the provided arguments
  var executeBound = function(sourceFunc, boundFunc, context, callingContext, args) {
    if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
    var self = baseCreate(sourceFunc.prototype);
    var result = sourceFunc.apply(self, args);
    if (_.isObject(result)) return result;
    return self;
  };

  // Create a function bound to a given object (assigning `this`, and arguments,
  // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
  // available.
  _.bind = function(func, context) {
    if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
    if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function');
    var args = slice.call(arguments, 2);
    var bound = function() {
      return executeBound(func, bound, context, this, args.concat(slice.call(arguments)));
    };
    return bound;
  };

  // Partially apply a function by creating a version that has had some of its
  // arguments pre-filled, without changing its dynamic `this` context. _ acts
  // as a placeholder, allowing any combination of arguments to be pre-filled.
  _.partial = function(func) {
    var boundArgs = slice.call(arguments, 1);
    var bound = function() {
      var position = 0, length = boundArgs.length;
      var args = Array(length);
      for (var i = 0; i < length; i++) {
        args[i] = boundArgs[i] === _ ? arguments[position++] : boundArgs[i];
      }
      while (position < arguments.length) args.push(arguments[position++]);
      return executeBound(func, bound, this, this, args);
    };
    return bound;
  };

  // Bind a number of an object's methods to that object. Remaining arguments
  // are the method names to be bound. Useful for ensuring that all callbacks
  // defined on an object belong to it.
  _.bindAll = function(obj) {
    var i, length = arguments.length, key;
    if (length <= 1) throw new Error('bindAll must be passed function names');
    for (i = 1; i < length; i++) {
      key = arguments[i];
      obj[key] = _.bind(obj[key], obj);
    }
    return obj;
  };

  // Memoize an expensive function by storing its results.
  _.memoize = function(func, hasher) {
    var memoize = function(key) {
      var cache = memoize.cache;
      var address = '' + (hasher ? hasher.apply(this, arguments) : key);
      if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);
      return cache[address];
    };
    memoize.cache = {};
    return memoize;
  };

  // Delays a function for the given number of milliseconds, and then calls
  // it with the arguments supplied.
  _.delay = function(func, wait) {
    var args = slice.call(arguments, 2);
    return setTimeout(function(){
      return func.apply(null, args);
    }, wait);
  };

  // Defers a function, scheduling it to run after the current call stack has
  // cleared.
  _.defer = _.partial(_.delay, _, 1);

  // Returns a function, that, when invoked, will only be triggered at most once
  // during a given window of time. Normally, the throttled function will run
  // as much as it can, without ever going more than once per `wait` duration;
  // but if you'd like to disable the execution on the leading edge, pass
  // `{leading: false}`. To disable execution on the trailing edge, ditto.
  _.throttle = function(func, wait, options) {
    var context, args, result;
    var timeout = null;
    var previous = 0;
    if (!options) options = {};
    var later = function() {
      previous = options.leading === false ? 0 : _.now();
      timeout = null;
      result = func.apply(context, args);
      if (!timeout) context = args = null;
    };
    return function() {
      var now = _.now();
      if (!previous && options.leading === false) previous = now;
      var remaining = wait - (now - previous);
      context = this;
      args = arguments;
      if (remaining <= 0 || remaining > wait) {
        if (timeout) {
          clearTimeout(timeout);
          timeout = null;
        }
        previous = now;
        result = func.apply(context, args);
        if (!timeout) context = args = null;
      } else if (!timeout && options.trailing !== false) {
        timeout = setTimeout(later, remaining);
      }
      return result;
    };
  };

  // Returns a function, that, as long as it continues to be invoked, will not
  // be triggered. The function will be called after it stops being called for
  // N milliseconds. If `immediate` is passed, trigger the function on the
  // leading edge, instead of the trailing.
  _.debounce = function(func, wait, immediate) {
    var timeout, args, context, timestamp, result;

    var later = function() {
      var last = _.now() - timestamp;

      if (last < wait && last >= 0) {
        timeout = setTimeout(later, wait - last);
      } else {
        timeout = null;
        if (!immediate) {
          result = func.apply(context, args);
          if (!timeout) context = args = null;
        }
      }
    };

    return function() {
      context = this;
      args = arguments;
      timestamp = _.now();
      var callNow = immediate && !timeout;
      if (!timeout) timeout = setTimeout(later, wait);
      if (callNow) {
        result = func.apply(context, args);
        context = args = null;
      }

      return result;
    };
  };

  // Returns the first function passed as an argument to the second,
  // allowing you to adjust arguments, run code before and after, and
  // conditionally execute the original function.
  _.wrap = function(func, wrapper) {
    return _.partial(wrapper, func);
  };

  // Returns a negated version of the passed-in predicate.
  _.negate = function(predicate) {
    return function() {
      return !predicate.apply(this, arguments);
    };
  };

  // Returns a function that is the composition of a list of functions, each
  // consuming the return value of the function that follows.
  _.compose = function() {
    var args = arguments;
    var start = args.length - 1;
    return function() {
      var i = start;
      var result = args[start].apply(this, arguments);
      while (i--) result = args[i].call(this, result);
      return result;
    };
  };

  // Returns a function that will only be executed on and after the Nth call.
  _.after = function(times, func) {
    return function() {
      if (--times < 1) {
        return func.apply(this, arguments);
      }
    };
  };

  // Returns a function that will only be executed up to (but not including) the Nth call.
  _.before = function(times, func) {
    var memo;
    return function() {
      if (--times > 0) {
        memo = func.apply(this, arguments);
      }
      if (times <= 1) func = null;
      return memo;
    };
  };

  // Returns a function that will be executed at most one time, no matter how
  // often you call it. Useful for lazy initialization.
  _.once = _.partial(_.before, 2);

  // Object Functions
  // ----------------

  // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
  var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');
  var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',
                      'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];

  function collectNonEnumProps(obj, keys) {
    var nonEnumIdx = nonEnumerableProps.length;
    var constructor = obj.constructor;
    var proto = (_.isFunction(constructor) && constructor.prototype) || ObjProto;

    // Constructor is a special case.
    var prop = 'constructor';
    if (_.has(obj, prop) && !_.contains(keys, prop)) keys.push(prop);

    while (nonEnumIdx--) {
      prop = nonEnumerableProps[nonEnumIdx];
      if (prop in obj && obj[prop] !== proto[prop] && !_.contains(keys, prop)) {
        keys.push(prop);
      }
    }
  }

  // Retrieve the names of an object's own properties.
  // Delegates to **ECMAScript 5**'s native `Object.keys`
  _.keys = function(obj) {
    if (!_.isObject(obj)) return [];
    if (nativeKeys) return nativeKeys(obj);
    var keys = [];
    for (var key in obj) if (_.has(obj, key)) keys.push(key);
    // Ahem, IE < 9.
    if (hasEnumBug) collectNonEnumProps(obj, keys);
    return keys;
  };

  // Retrieve all the property names of an object.
  _.allKeys = function(obj) {
    if (!_.isObject(obj)) return [];
    var keys = [];
    for (var key in obj) keys.push(key);
    // Ahem, IE < 9.
    if (hasEnumBug) collectNonEnumProps(obj, keys);
    return keys;
  };

  // Retrieve the values of an object's properties.
  _.values = function(obj) {
    var keys = _.keys(obj);
    var length = keys.length;
    var values = Array(length);
    for (var i = 0; i < length; i++) {
      values[i] = obj[keys[i]];
    }
    return values;
  };

  // Returns the results of applying the iteratee to each element of the object
  // In contrast to _.map it returns an object
  _.mapObject = function(obj, iteratee, context) {
    iteratee = cb(iteratee, context);
    var keys =  _.keys(obj),
          length = keys.length,
          results = {},
          currentKey;
      for (var index = 0; index < length; index++) {
        currentKey = keys[index];
        results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
      }
      return results;
  };

  // Convert an object into a list of `[key, value]` pairs.
  _.pairs = function(obj) {
    var keys = _.keys(obj);
    var length = keys.length;
    var pairs = Array(length);
    for (var i = 0; i < length; i++) {
      pairs[i] = [keys[i], obj[keys[i]]];
    }
    return pairs;
  };

  // Invert the keys and values of an object. The values must be serializable.
  _.invert = function(obj) {
    var result = {};
    var keys = _.keys(obj);
    for (var i = 0, length = keys.length; i < length; i++) {
      result[obj[keys[i]]] = keys[i];
    }
    return result;
  };

  // Return a sorted list of the function names available on the object.
  // Aliased as `methods`
  _.functions = _.methods = function(obj) {
    var names = [];
    for (var key in obj) {
      if (_.isFunction(obj[key])) names.push(key);
    }
    return names.sort();
  };

  // Extend a given object with all the properties in passed-in object(s).
  _.extend = createAssigner(_.allKeys);

  // Assigns a given object with all the own properties in the passed-in object(s)
  // (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
  _.extendOwn = _.assign = createAssigner(_.keys);

  // Returns the first key on an object that passes a predicate test
  _.findKey = function(obj, predicate, context) {
    predicate = cb(predicate, context);
    var keys = _.keys(obj), key;
    for (var i = 0, length = keys.length; i < length; i++) {
      key = keys[i];
      if (predicate(obj[key], key, obj)) return key;
    }
  };

  // Return a copy of the object only containing the whitelisted properties.
  _.pick = function(object, oiteratee, context) {
    var result = {}, obj = object, iteratee, keys;
    if (obj == null) return result;
    if (_.isFunction(oiteratee)) {
      keys = _.allKeys(obj);
      iteratee = optimizeCb(oiteratee, context);
    } else {
      keys = flatten(arguments, false, false, 1);
      iteratee = function(value, key, obj) { return key in obj; };
      obj = Object(obj);
    }
    for (var i = 0, length = keys.length; i < length; i++) {
      var key = keys[i];
      var value = obj[key];
      if (iteratee(value, key, obj)) result[key] = value;
    }
    return result;
  };

   // Return a copy of the object without the blacklisted properties.
  _.omit = function(obj, iteratee, context) {
    if (_.isFunction(iteratee)) {
      iteratee = _.negate(iteratee);
    } else {
      var keys = _.map(flatten(arguments, false, false, 1), String);
      iteratee = function(value, key) {
        return !_.contains(keys, key);
      };
    }
    return _.pick(obj, iteratee, context);
  };

  // Fill in a given object with default properties.
  _.defaults = createAssigner(_.allKeys, true);

  // Creates an object that inherits from the given prototype object.
  // If additional properties are provided then they will be added to the
  // created object.
  _.create = function(prototype, props) {
    var result = baseCreate(prototype);
    if (props) _.extendOwn(result, props);
    return result;
  };

  // Create a (shallow-cloned) duplicate of an object.
  _.clone = function(obj) {
    if (!_.isObject(obj)) return obj;
    return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
  };

  // Invokes interceptor with the obj, and then returns obj.
  // The primary purpose of this method is to "tap into" a method chain, in
  // order to perform operations on intermediate results within the chain.
  _.tap = function(obj, interceptor) {
    interceptor(obj);
    return obj;
  };

  // Returns whether an object has a given set of `key:value` pairs.
  _.isMatch = function(object, attrs) {
    var keys = _.keys(attrs), length = keys.length;
    if (object == null) return !length;
    var obj = Object(object);
    for (var i = 0; i < length; i++) {
      var key = keys[i];
      if (attrs[key] !== obj[key] || !(key in obj)) return false;
    }
    return true;
  };


  // Internal recursive comparison function for `isEqual`.
  var eq = function(a, b, aStack, bStack) {
    // Identical objects are equal. `0 === -0`, but they aren't identical.
    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
    if (a === b) return a !== 0 || 1 / a === 1 / b;
    // A strict comparison is necessary because `null == undefined`.
    if (a == null || b == null) return a === b;
    // Unwrap any wrapped objects.
    if (a instanceof _) a = a._wrapped;
    if (b instanceof _) b = b._wrapped;
    // Compare `[[Class]]` names.
    var className = toString.call(a);
    if (className !== toString.call(b)) return false;
    switch (className) {
      // Strings, numbers, regular expressions, dates, and booleans are compared by value.
      case '[object RegExp]':
      // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
      case '[object String]':
        // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
        // equivalent to `new String("5")`.
        return '' + a === '' + b;
      case '[object Number]':
        // `NaN`s are equivalent, but non-reflexive.
        // Object(NaN) is equivalent to NaN
        if (+a !== +a) return +b !== +b;
        // An `egal` comparison is performed for other numeric values.
        return +a === 0 ? 1 / +a === 1 / b : +a === +b;
      case '[object Date]':
      case '[object Boolean]':
        // Coerce dates and booleans to numeric primitive values. Dates are compared by their
        // millisecond representations. Note that invalid dates with millisecond representations
        // of `NaN` are not equivalent.
        return +a === +b;
    }

    var areArrays = className === '[object Array]';
    if (!areArrays) {
      if (typeof a != 'object' || typeof b != 'object') return false;

      // Objects with different constructors are not equivalent, but `Object`s or `Array`s
      // from different frames are.
      var aCtor = a.constructor, bCtor = b.constructor;
      if (aCtor !== bCtor && !(_.isFunction(aCtor) && aCtor instanceof aCtor &&
                               _.isFunction(bCtor) && bCtor instanceof bCtor)
                          && ('constructor' in a && 'constructor' in b)) {
        return false;
      }
    }
    // Assume equality for cyclic structures. The algorithm for detecting cyclic
    // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.

    // Initializing stack of traversed objects.
    // It's done here since we only need them for objects and arrays comparison.
    aStack = aStack || [];
    bStack = bStack || [];
    var length = aStack.length;
    while (length--) {
      // Linear search. Performance is inversely proportional to the number of
      // unique nested structures.
      if (aStack[length] === a) return bStack[length] === b;
    }

    // Add the first object to the stack of traversed objects.
    aStack.push(a);
    bStack.push(b);

    // Recursively compare objects and arrays.
    if (areArrays) {
      // Compare array lengths to determine if a deep comparison is necessary.
      length = a.length;
      if (length !== b.length) return false;
      // Deep compare the contents, ignoring non-numeric properties.
      while (length--) {
        if (!eq(a[length], b[length], aStack, bStack)) return false;
      }
    } else {
      // Deep compare objects.
      var keys = _.keys(a), key;
      length = keys.length;
      // Ensure that both objects contain the same number of properties before comparing deep equality.
      if (_.keys(b).length !== length) return false;
      while (length--) {
        // Deep compare each member
        key = keys[length];
        if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
      }
    }
    // Remove the first object from the stack of traversed objects.
    aStack.pop();
    bStack.pop();
    return true;
  };

  // Perform a deep comparison to check if two objects are equal.
  _.isEqual = function(a, b) {
    return eq(a, b);
  };

  // Is a given array, string, or object empty?
  // An "empty" object has no enumerable own-properties.
  _.isEmpty = function(obj) {
    if (obj == null) return true;
    if (isArrayLike(obj) && (_.isArray(obj) || _.isString(obj) || _.isArguments(obj))) return obj.length === 0;
    return _.keys(obj).length === 0;
  };

  // Is a given value a DOM element?
  _.isElement = function(obj) {
    return !!(obj && obj.nodeType === 1);
  };

  // Is a given value an array?
  // Delegates to ECMA5's native Array.isArray
  _.isArray = nativeIsArray || function(obj) {
    return toString.call(obj) === '[object Array]';
  };

  // Is a given variable an object?
  _.isObject = function(obj) {
    var type = typeof obj;
    return type === 'function' || type === 'object' && !!obj;
  };

  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.
  _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error'], function(name) {
    _['is' + name] = function(obj) {
      return toString.call(obj) === '[object ' + name + ']';
    };
  });

  // Define a fallback version of the method in browsers (ahem, IE < 9), where
  // there isn't any inspectable "Arguments" type.
  if (!_.isArguments(arguments)) {
    _.isArguments = function(obj) {
      return _.has(obj, 'callee');
    };
  }

  // Optimize `isFunction` if appropriate. Work around some typeof bugs in old v8,
  // IE 11 (#1621), and in Safari 8 (#1929).
  if (typeof /./ != 'function' && typeof Int8Array != 'object') {
    _.isFunction = function(obj) {
      return typeof obj == 'function' || false;
    };
  }

  // Is a given object a finite number?
  _.isFinite = function(obj) {
    return isFinite(obj) && !isNaN(parseFloat(obj));
  };

  // Is the given value `NaN`? (NaN is the only number which does not equal itself).
  _.isNaN = function(obj) {
    return _.isNumber(obj) && obj !== +obj;
  };

  // Is a given value a boolean?
  _.isBoolean = function(obj) {
    return obj === true || obj === false || toString.call(obj) === '[object Boolean]';
  };

  // Is a given value equal to null?
  _.isNull = function(obj) {
    return obj === null;
  };

  // Is a given variable undefined?
  _.isUndefined = function(obj) {
    return obj === void 0;
  };

  // Shortcut function for checking if an object has a given property directly
  // on itself (in other words, not on a prototype).
  _.has = function(obj, key) {
    return obj != null && hasOwnProperty.call(obj, key);
  };

  // Utility Functions
  // -----------------

  // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
  // previous owner. Returns a reference to the Underscore object.
  _.noConflict = function() {
    root._ = previousUnderscore;
    return this;
  };

  // Keep the identity function around for default iteratees.
  _.identity = function(value) {
    return value;
  };

  // Predicate-generating functions. Often useful outside of Underscore.
  _.constant = function(value) {
    return function() {
      return value;
    };
  };

  _.noop = function(){};

  _.property = property;

  // Generates a function for a given object that returns a given property.
  _.propertyOf = function(obj) {
    return obj == null ? function(){} : function(key) {
      return obj[key];
    };
  };

  // Returns a predicate for checking whether an object has a given set of
  // `key:value` pairs.
  _.matcher = _.matches = function(attrs) {
    attrs = _.extendOwn({}, attrs);
    return function(obj) {
      return _.isMatch(obj, attrs);
    };
  };

  // Run a function **n** times.
  _.times = function(n, iteratee, context) {
    var accum = Array(Math.max(0, n));
    iteratee = optimizeCb(iteratee, context, 1);
    for (var i = 0; i < n; i++) accum[i] = iteratee(i);
    return accum;
  };

  // Return a random integer between min and max (inclusive).
  _.random = function(min, max) {
    if (max == null) {
      max = min;
      min = 0;
    }
    return min + Math.floor(Math.random() * (max - min + 1));
  };

  // A (possibly faster) way to get the current timestamp as an integer.
  _.now = Date.now || function() {
    return new Date().getTime();
  };

   // List of HTML entities for escaping.
  var escapeMap = {
    '&': '&amp;',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#x27;',
    '`': '&#x60;'
  };
  var unescapeMap = _.invert(escapeMap);

  // Functions for escaping and unescaping strings to/from HTML interpolation.
  var createEscaper = function(map) {
    var escaper = function(match) {
      return map[match];
    };
    // Regexes for identifying a key that needs to be escaped
    var source = '(?:' + _.keys(map).join('|') + ')';
    var testRegexp = RegExp(source);
    var replaceRegexp = RegExp(source, 'g');
    return function(string) {
      string = string == null ? '' : '' + string;
      return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
    };
  };
  _.escape = createEscaper(escapeMap);
  _.unescape = createEscaper(unescapeMap);

  // If the value of the named `property` is a function then invoke it with the
  // `object` as context; otherwise, return it.
  _.result = function(object, property, fallback) {
    var value = object == null ? void 0 : object[property];
    if (value === void 0) {
      value = fallback;
    }
    return _.isFunction(value) ? value.call(object) : value;
  };

  // Generate a unique integer id (unique within the entire client session).
  // Useful for temporary DOM ids.
  var idCounter = 0;
  _.uniqueId = function(prefix) {
    var id = ++idCounter + '';
    return prefix ? prefix + id : id;
  };

  // By default, Underscore uses ERB-style template delimiters, change the
  // following template settings to use alternative delimiters.
  _.templateSettings = {
    evaluate    : /<%([\s\S]+?)%>/g,
    interpolate : /<%=([\s\S]+?)%>/g,
    escape      : /<%-([\s\S]+?)%>/g
  };

  // When customizing `templateSettings`, if you don't want to define an
  // interpolation, evaluation or escaping regex, we need one that is
  // guaranteed not to match.
  var noMatch = /(.)^/;

  // Certain characters need to be escaped so that they can be put into a
  // string literal.
  var escapes = {
    "'":      "'",
    '\\':     '\\',
    '\r':     'r',
    '\n':     'n',
    '\u2028': 'u2028',
    '\u2029': 'u2029'
  };

  var escaper = /\\|'|\r|\n|\u2028|\u2029/g;

  var escapeChar = function(match) {
    return '\\' + escapes[match];
  };

  // JavaScript micro-templating, similar to John Resig's implementation.
  // Underscore templating handles arbitrary delimiters, preserves whitespace,
  // and correctly escapes quotes within interpolated code.
  // NB: `oldSettings` only exists for backwards compatibility.
  _.template = function(text, settings, oldSettings) {
    if (!settings && oldSettings) settings = oldSettings;
    settings = _.defaults({}, settings, _.templateSettings);

    // Combine delimiters into one regular expression via alternation.
    var matcher = RegExp([
      (settings.escape || noMatch).source,
      (settings.interpolate || noMatch).source,
      (settings.evaluate || noMatch).source
    ].join('|') + '|$', 'g');

    // Compile the template source, escaping string literals appropriately.
    var index = 0;
    var source = "__p+='";
    text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
      source += text.slice(index, offset).replace(escaper, escapeChar);
      index = offset + match.length;

      if (escape) {
        source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
      } else if (interpolate) {
        source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
      } else if (evaluate) {
        source += "';\n" + evaluate + "\n__p+='";
      }

      // Adobe VMs need the match returned to produce the correct offest.
      return match;
    });
    source += "';\n";

    // If a variable is not specified, place data values in local scope.
    if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';

    source = "var __t,__p='',__j=Array.prototype.join," +
      "print=function(){__p+=__j.call(arguments,'');};\n" +
      source + 'return __p;\n';

    try {
      var render = new Function(settings.variable || 'obj', '_', source);
    } catch (e) {
      e.source = source;
      throw e;
    }

    var template = function(data) {
      return render.call(this, data, _);
    };

    // Provide the compiled source as a convenience for precompilation.
    var argument = settings.variable || 'obj';
    template.source = 'function(' + argument + '){\n' + source + '}';

    return template;
  };

  // Add a "chain" function. Start chaining a wrapped Underscore object.
  _.chain = function(obj) {
    var instance = _(obj);
    instance._chain = true;
    return instance;
  };

  // OOP
  // ---------------
  // If Underscore is called as a function, it returns a wrapped object that
  // can be used OO-style. This wrapper holds altered versions of all the
  // underscore functions. Wrapped objects may be chained.

  // Helper function to continue chaining intermediate results.
  var result = function(instance, obj) {
    return instance._chain ? _(obj).chain() : obj;
  };

  // Add your own custom functions to the Underscore object.
  _.mixin = function(obj) {
    _.each(_.functions(obj), function(name) {
      var func = _[name] = obj[name];
      _.prototype[name] = function() {
        var args = [this._wrapped];
        push.apply(args, arguments);
        return result(this, func.apply(_, args));
      };
    });
  };

  // Add all of the Underscore functions to the wrapper object.
  _.mixin(_);

  // Add all mutator Array functions to the wrapper.
  _.each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
    var method = ArrayProto[name];
    _.prototype[name] = function() {
      var obj = this._wrapped;
      method.apply(obj, arguments);
      if ((name === 'shift' || name === 'splice') && obj.length === 0) delete obj[0];
      return result(this, obj);
    };
  });

  // Add all accessor Array functions to the wrapper.
  _.each(['concat', 'join', 'slice'], function(name) {
    var method = ArrayProto[name];
    _.prototype[name] = function() {
      return result(this, method.apply(this._wrapped, arguments));
    };
  });

  // Extracts the result from a wrapped and chained object.
  _.prototype.value = function() {
    return this._wrapped;
  };

  // Provide unwrapping proxy for some methods used in engine operations
  // such as arithmetic and JSON stringification.
  _.prototype.valueOf = _.prototype.toJSON = _.prototype.value;

  _.prototype.toString = function() {
    return '' + this._wrapped;
  };

  // AMD registration happens at the end for compatibility with AMD loaders
  // that may not enforce next-turn semantics on modules. Even though general
  // practice for AMD registration is to be anonymous, underscore registers
  // as a named module because, like jQuery, it is a base library that is
  // popular enough to be bundled in a third party lib, but not be part of
  // an AMD load request. Those cases could generate an error when an
  // anonymous define() is called outside of a loader request.
  if (typeof define === 'function' && define.amd) {
    define('underscore', [], function() {
      return _;
    });
  }
}.call(this));

},{}],40:[function(_dereq_,module,exports){
var bundleFn = arguments[3];
var sources = arguments[4];
var cache = arguments[5];

var stringify = JSON.stringify;

module.exports = function (fn) {
    var keys = [];
    var wkey;
    var cacheKeys = Object.keys(cache);

    for (var i = 0, l = cacheKeys.length; i < l; i++) {
        var key = cacheKeys[i];
        var exp = cache[key].exports;
        // Using babel as a transpiler to use esmodule, the export will always
        // be an object with the default export as a property of it. To ensure
        // the existing api and babel esmodule exports are both supported we
        // check for both
        if (exp === fn || exp.default === fn) {
            wkey = key;
            break;
        }
    }

    if (!wkey) {
        wkey = Math.floor(Math.pow(16, 8) * Math.random()).toString(16);
        var wcache = {};
        for (var i = 0, l = cacheKeys.length; i < l; i++) {
            var key = cacheKeys[i];
            wcache[key] = key;
        }
        sources[wkey] = [
            Function(['require','module','exports'], '(' + fn + ')(self)'),
            wcache
        ];
    }
    var skey = Math.floor(Math.pow(16, 8) * Math.random()).toString(16);

    var scache = {}; scache[wkey] = wkey;
    sources[skey] = [
        Function(['require'], (
            // try to call default if defined to also support babel esmodule
            // exports
            'var f = require(' + stringify(wkey) + ');' +
            '(f.default ? f.default : f)(self);'
        )),
        scache
    ];

    var src = '(' + bundleFn + ')({'
        + Object.keys(sources).map(function (key) {
            return stringify(key) + ':['
                + sources[key][0]
                + ',' + stringify(sources[key][1]) + ']'
            ;
        }).join(',')
        + '},{},[' + stringify(skey) + '])'
    ;

    var URL = window.URL || window.webkitURL || window.mozURL || window.msURL;

    return new Worker(URL.createObjectURL(
        new Blob([src], { type: 'text/javascript' })
    ));
};

},{}],41:[function(_dereq_,module,exports){
'use strict';

var Graph = _dereq_('ngraph.graph');
var _ = _dereq_('underscore');
var Q = _dereq_('Q');
var Nlayout = _dereq_('ngraph.asyncforce');
// registers the extension on a cytoscape lib ref

var ngraph = function (cytoscape) {

    if (!cytoscape) {
        return;
    } // can't register if cytoscape unspecified

    var defaults = {
        async: {
            // tell layout that we want to compute all at once:
            maxIterations: 1000,
            stepsPerCycle: 30,

            // Run it till the end:
            waitForStep: false
        },
        physics: {
            /**
             * Ideal length for links (springs in physical model).
             */
            springLength: 100,

            /**
             * Hook's law coefficient. 1 - solid spring.
             */
            springCoeff: 0.0008,

            /**
             * Coulomb's law coefficient. It's used to repel nodes thus should be negative
             * if you make it positive nodes start attract each other :).
             */
            gravity: -1.2,

            /**
             * Theta coefficient from Barnes Hut simulation. Ranged between (0, 1).
             * The closer it's to 1 the more nodes algorithm will have to go through.
             * Setting it to one makes Barnes Hut simulation no different from
             * brute-force forces calculation (each node is considered).
             */
            theta: 0.8,

            /**
             * Drag force coefficient. Used to slow down system, thus should be less than 1.
             * The closer it is to 0 the less tight system will be.
             */
            dragCoeff: 0.02,

            /**
             * Default time step (dt) for forces integration
             */
            timeStep: 20,
            iterations: 10000,
            fit: true,

            /**
             * Maximum movement of the system which can be considered as stabilized
             */
            stableThreshold: 0.000009
        },
        iterations: 10000,
        refreshInterval: 16, // in ms
        refreshIterations: 10, // iterations until thread sends an update
        stableThreshold: 2,
        animate: true,
        fit: true
    };

    var extend = Object.assign || function (tgt) {
        for (var i = 1; i < arguments.length; i++) {
            var obj = arguments[i];

            for (var k in obj) {
                tgt[k] = obj[k];
            }
        }
        return tgt;
    };

    function Layout(options) {
        this.options = extend({}, defaults, options);
        this.layoutOptions = extend({}, defaults, options);
        delete this.layoutOptions.cy;
        delete this.layoutOptions.eles;
    }

    Layout.prototype.l = Nlayout;
    Layout.prototype.g = Graph;

    Layout.prototype.run = function () {
        var layout = this;
        layout.trigger({ type: 'layoutstart', layout: layout });
        var options = this.options;
        var layoutOptions = this.layoutOptions;
        var that = this;
        var graph = that.g();
        var cy = options.cy;
        var eles = options.eles;
        var nodes = eles.nodes();
        var parents = nodes.parents();

        // FILTER

        nodes = nodes.difference(parents);

        nodes = nodes.filterFn(function (ele) {
            return ele.connectedEdges().length > 0
        });

        var edges = eles.edges();
        var edgesHash = {};
        var L;


        var firstUpdate = true;

        /*        if (eles.length > 3000) {
         options.iterations = options.iterations - Math.abs(options.iterations / 3); // reduce iterations for big graph
         }*/


        var update = function (nodesJson) {
            /* cy.batch(function () {
             nodesJson.forEach(function(e,k){
             nodes.$('#'+ e.data.id).position(e.position);
             })

             });*/
            nodes.positions(function (i, node) {
                if (typeof i != 'number') {
                    node = i;
                }
                if (!node.data('dragging'))
                    return L.getNodePosition(node.id())
            });

            // if (layoutOptions.async) {
            //     setTimeout(function () {
            //         layout.trigger({ type: 'layoutstop', layout: layout });
            //         layout.trigger({ type: 'layoutready', layout: layout });
            //     }, 500);
            // }

            /* nodes.forEach(function (node) {
             L.getNodePosition(node.id())
             });*/

            // maybe we fit each iteration
            if (layoutOptions.fit) {
                cy.fit(layoutOptions.padding);
            }

            if (firstUpdate) {
                // indicate the initial positions have been set
                layout.trigger('layoutready');
                firstUpdate = false;
            }

        };


            _.each(nodes, function (e, k) {
                e.on('tapstart', function (e) {
                    e.target.data('dragging', true)
                });
                e.on('tapend', function (e) {
                    e.target.removeData('dragging');
                });
                e.on('position', 'node[dragging]', function (e) {
                    if (L.setNodePosition && e.target.data('dragging')) {
                        L.setNodePosition(e.target.data().id);
                    }
                });
                graph.addNode(e.data().id);
            });


        _.each(nodes, function (e, k) {
            e.on('tapstart', function (e) {
                e.target.data('dragging', true)
            });
            e.on('tapend', function (e) {
                e.target.removeData('dragging');
            });
            e.on('position', 'node[dragging]', function (e) {
                if (L.setNodePosition && e.target.data('dragging')) {
                    L.setNodePosition(e.target.data().id);
                }
            });
            graph.addNode(e.data().id);
        });

        _.each(edges, function (e, k) {
            if (!edgesHash[e.data().source + ':' + e.data().target] && !edgesHash[e.data().target + ':' + e.data().source]) {
                edgesHash[e.data().source + ':' + e.data().target] = e;
                graph.addLink(e.data().source, e.data().target);
            }
        });

        L = that.l(graph, layoutOptions);

        _.each(nodes, function (e, k) {
            var data = e.data();
            //var pos = e.position();
            if (data.pin) {
                L.pinNode(data.id, true);
                e.removeData('pin');
                e.data('unpin', true);
            } else if (data.unpin) {
                L.pinNode(data.id, false);
                e.removeData('unpin');
            }
            //if (pos.x && pos.y) {
            //  L.setNodePosition(data.id, pos);
            //}
        });


            this.on('cyclestop', function (e) {
                L.off('cycle');
            });


        var left = layoutOptions.iterations;
        if (layoutOptions.async && layoutOptions.async.maxIterations) {
            left = (layoutOptions.async.maxIterations / layoutOptions.async.stepsPerCycle).toFixed(0);
        }

        this.on('layoutstop', function () {
            layoutOptions.iterations = 0;
        });

        L.on('stable', function () {
            console.log('got Stable event');
            left = 0;
        });

        if (!layoutOptions.async) {
            layoutOptions.refreshInterval = 0;
        }
        var updateTimeout;
        L.on('cycle', function (i, stop) {
            if (layoutOptions.animate) {
                update();
            }
            if (stop) {
                update();
                layout.trigger({ type: 'layoutstop', layout: layout });
                layout.trigger({ type: 'layoutready', layout: layout });
                return;
            }
            step(stop);
        });

        // if (layoutOptions.async) {
        //     return this;
        // }

        var step = function (stop) {
            if (left != 0 || !stop  /*condition for stopping layout*/) {
                if (!updateTimeout || left == 0) {
                    //   updateTimeout = setTimeout(function () {
                    left--;
                    //update();
                    updateTimeout = null;
                    var stop = L.step();
                    stop ? left = 0 : false;
                    if (!left) {
                        step();
                    }
                    //   }, layoutOptions.refreshInterval);
                }
            } else {
                update();
                layout.trigger({ type: 'layoutstop', layout: layout });
                layout.trigger({ type: 'layoutready', layout: layout });
            }
        };
        step();
        return this;
    };

    Layout.prototype.stop = function () {
        // TODO: thread actions
        // continuous/asynchronous layout may want to set a flag etc to let
        // run() know to stop

            this.trigger('cyclestop');

        if (this.thread) {
            this.thread.stop();
        }

        this.trigger('layoutstop');

        return this; // chaining
    };

    Layout.prototype.destroy = function () {
        // clean up here if you create threads etc
        // TODO: thread actions

        if (this.thread) {
            this.thread.stop();
        }

        return this; // chaining
    };

    return Layout;

};

module.exports = function get(cytoscape) {
    return ngraph(cytoscape);
};

},{"Q":1,"ngraph.asyncforce":2,"ngraph.graph":24,"underscore":39}],42:[function(_dereq_,module,exports){
'use strict';

(function(){

    // registers the extension on a cytoscape lib ref
    var getLayout = _dereq_('./impl.js');
    var register = function( cytoscape ){
        var Layout = getLayout( cytoscape );
        cytoscape('layout', 'cytoscape-ngraph.forcelayout', Layout);
    };

    if( typeof module !== 'undefined' && module.exports ){ // expose as a commonjs module
        module.exports = register;
    }

    if( typeof define !== 'undefined' && define.amd ){ // expose as an amd/requirejs module
        define('cytoscape-ngraph.forcelayout', function(){
            return register;
        });
    }

    if( typeof cytoscape !== 'undefined' ){ // expose to global cytoscape (i.e. window.cytoscape)
        register( cytoscape );
    }

})();
},{"./impl.js":41}]},{},[42])(42)
});
//# 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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","// vim:ts=4:sts=4:sw=4:\n/*!\n *\n * Copyright 2009-2012 Kris Kowal under the terms of the MIT\n * license found at http://github.com/kriskowal/q/raw/master/LICENSE\n *\n * With parts by Tyler Close\n * Copyright 2007-2009 Tyler Close under the terms of the MIT X license found\n * at http://www.opensource.org/licenses/mit-license.html\n * Forked at ref_send.js version: 2009-05-11\n *\n * With parts by Mark Miller\n * Copyright (C) 2011 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n *\n */\n\n(function (definition) {\n    \"use strict\";\n\n    // This file will function properly as a <script> tag, or a module\n    // using CommonJS and NodeJS or RequireJS module formats.  In\n    // Common/Node/RequireJS, the module exports the Q API and when\n    // executed as a simple <script>, it creates a Q global instead.\n\n    // Montage Require\n    if (typeof bootstrap === \"function\") {\n        bootstrap(\"promise\", definition);\n\n    // CommonJS\n    } else if (typeof exports === \"object\" && typeof module === \"object\") {\n        module.exports = definition();\n\n    // RequireJS\n    } else if (typeof define === \"function\" && define.amd) {\n        define(definition);\n\n    // SES (Secure EcmaScript)\n    } else if (typeof ses !== \"undefined\") {\n        if (!ses.ok()) {\n            return;\n        } else {\n            ses.makeQ = definition;\n        }\n\n    // <script>\n    } else if (typeof window !== \"undefined\" || typeof self !== \"undefined\") {\n        // Prefer window over self for add-on scripts. Use self for\n        // non-windowed contexts.\n        var global = typeof window !== \"undefined\" ? window : self;\n\n        // Get the `window` object, save the previous Q global\n        // and initialize Q as a global.\n        var previousQ = global.Q;\n        global.Q = definition();\n\n        // Add a noConflict function so Q can be removed from the\n        // global namespace.\n        global.Q.noConflict = function () {\n            global.Q = previousQ;\n            return this;\n        };\n\n    } else {\n        throw new Error(\"This environment was not anticipated by Q. Please file a bug.\");\n    }\n\n})(function () {\n\"use strict\";\n\nvar hasStacks = false;\ntry {\n    throw new Error();\n} catch (e) {\n    hasStacks = !!e.stack;\n}\n\n// All code after this point will be filtered from stack traces reported\n// by Q.\nvar qStartingLine = captureLine();\nvar qFileName;\n\n// shims\n\n// used for fallback in \"allResolved\"\nvar noop = function () {};\n\n// Use the fastest possible means to execute a task in a future turn\n// of the event loop.\nvar nextTick =(function () {\n    // linked list of tasks (single, with head node)\n    var head = {task: void 0, next: null};\n    var tail = head;\n    var flushing = false;\n    var requestTick = void 0;\n    var isNodeJS = false;\n    // queue for late tasks, used by unhandled rejection tracking\n    var laterQueue = [];\n\n    function flush() {\n        /* jshint loopfunc: true */\n        var task, domain;\n\n        while (head.next) {\n            head = head.next;\n            task = head.task;\n            head.task = void 0;\n            domain = head.domain;\n\n            if (domain) {\n                head.domain = void 0;\n                domain.enter();\n            }\n            runSingle(task, domain);\n\n        }\n        while (laterQueue.length) {\n            task = laterQueue.pop();\n            runSingle(task);\n        }\n        flushing = false;\n    }\n    // runs a single function in the async queue\n    function runSingle(task, domain) {\n        try {\n            task();\n\n        } catch (e) {\n            if (isNodeJS) {\n                // In node, uncaught exceptions are considered fatal errors.\n                // Re-throw them synchronously to interrupt flushing!\n\n                // Ensure continuation if the uncaught exception is suppressed\n                // listening \"uncaughtException\" events (as domains does).\n                // Continue in next event to avoid tick recursion.\n                if (domain) {\n                    domain.exit();\n                }\n                setTimeout(flush, 0);\n                if (domain) {\n                    domain.enter();\n                }\n\n                throw e;\n\n            } else {\n                // In browsers, uncaught exceptions are not fatal.\n                // Re-throw them asynchronously to avoid slow-downs.\n                setTimeout(function () {\n                    throw e;\n                }, 0);\n            }\n        }\n\n        if (domain) {\n            domain.exit();\n        }\n    }\n\n    nextTick = function (task) {\n        tail = tail.next = {\n            task: task,\n            domain: isNodeJS && process.domain,\n            next: null\n        };\n\n        if (!flushing) {\n            flushing = true;\n            requestTick();\n        }\n    };\n\n    if (typeof process === \"object\" &&\n        process.toString() === \"[object process]\" && process.nextTick) {\n        // Ensure Q is in a real Node environment, with a `process.nextTick`.\n        // To see through fake Node environments:\n        // * Mocha test runner - exposes a `process` global without a `nextTick`\n        // * Browserify - exposes a `process.nexTick` function that uses\n        //   `setTimeout`. In this case `setImmediate` is preferred because\n        //    it is faster. Browserify's `process.toString()` yields\n        //   \"[object Object]\", while in a real Node environment\n        //   `process.nextTick()` yields \"[object process]\".\n        isNodeJS = true;\n\n        requestTick = function () {\n            process.nextTick(flush);\n        };\n\n    } else if (typeof setImmediate === \"function\") {\n        // In IE10, Node.js 0.9+, or https://github.com/NobleJS/setImmediate\n        if (typeof window !== \"undefined\") {\n            requestTick = setImmediate.bind(window, flush);\n        } else {\n            requestTick = function () {\n                setImmediate(flush);\n            };\n        }\n\n    } else if (typeof MessageChannel !== \"undefined\") {\n        // modern browsers\n        // http://www.nonblocking.io/2011/06/windownexttick.html\n        var channel = new MessageChannel();\n        // At least Safari Version 6.0.5 (8536.30.1) intermittently cannot create\n        // working message ports the first time a page loads.\n        channel.port1.onmessage = function () {\n            requestTick = requestPortTick;\n            channel.port1.onmessage = flush;\n            flush();\n        };\n        var requestPortTick = function () {\n            // Opera requires us to provide a message payload, regardless of\n            // whether we use it.\n            channel.port2.postMessage(0);\n        };\n        requestTick = function () {\n            setTimeout(flush, 0);\n            requestPortTick();\n        };\n\n    } else {\n        // old browsers\n        requestTick = function () {\n            setTimeout(flush, 0);\n        };\n    }\n    // runs a task after all other tasks have been run\n    // this is useful for unhandled rejection tracking that needs to happen\n    // after all `then`d tasks have been run.\n    nextTick.runAfter = function (task) {\n        laterQueue.push(task);\n        if (!flushing) {\n            flushing = true;\n            requestTick();\n        }\n    };\n    return nextTick;\n})();\n\n// Attempt to make generics safe in the face of downstream\n// modifications.\n// There is no situation where this is necessary.\n// If you need a security guarantee, these primordials need to be\n// deeply frozen anyway, and if you don’t need a security guarantee,\n// this is just plain paranoid.\n// However, this **might** have the nice side-effect of reducing the size of\n// the minified code by reducing x.call() to merely x()\n// See Mark Miller’s explanation of what this does.\n// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming\nvar call = Function.call;\nfunction uncurryThis(f) {\n    return function () {\n        return call.apply(f, arguments);\n    };\n}\n// This is equivalent, but slower:\n// uncurryThis = Function_bind.bind(Function_bind.call);\n// http://jsperf.com/uncurrythis\n\nvar array_slice = uncurryThis(Array.prototype.slice);\n\nvar array_reduce = uncurryThis(\n    Array.prototype.reduce || function (callback, basis) {\n        var index = 0,\n            length = this.length;\n        // concerning the initial value, if one is not provided\n        if (arguments.length === 1) {\n            // seek to the first value in the array, accounting\n            // for the possibility that is is a sparse array\n            do {\n                if (index in this) {\n                    basis = this[index++];\n                    break;\n                }\n                if (++index >= length) {\n                    throw new TypeError();\n                }\n            } while (1);\n        }\n        // reduce\n        for (; index < length; index++) {\n            // account for the possibility that the array is sparse\n            if (index in this) {\n                basis = callback(basis, this[index], index);\n            }\n        }\n        return basis;\n    }\n);\n\nvar array_indexOf = uncurryThis(\n    Array.prototype.indexOf || function (value) {\n        // not a very good shim, but good enough for our one use of it\n        for (var i = 0; i < this.length; i++) {\n            if (this[i] === value) {\n                return i;\n            }\n        }\n        return -1;\n    }\n);\n\nvar array_map = uncurryThis(\n    Array.prototype.map || function (callback, thisp) {\n        var self = this;\n        var collect = [];\n        array_reduce(self, function (undefined, value, index) {\n            collect.push(callback.call(thisp, value, index, self));\n        }, void 0);\n        return collect;\n    }\n);\n\nvar object_create = Object.create || function (prototype) {\n    function Type() { }\n    Type.prototype = prototype;\n    return new Type();\n};\n\nvar object_hasOwnProperty = uncurryThis(Object.prototype.hasOwnProperty);\n\nvar object_keys = Object.keys || function (object) {\n    var keys = [];\n    for (var key in object) {\n        if (object_hasOwnProperty(object, key)) {\n            keys.push(key);\n        }\n    }\n    return keys;\n};\n\nvar object_toString = uncurryThis(Object.prototype.toString);\n\nfunction isObject(value) {\n    return value === Object(value);\n}\n\n// generator related shims\n\n// FIXME: Remove this function once ES6 generators are in SpiderMonkey.\nfunction isStopIteration(exception) {\n    return (\n        object_toString(exception) === \"[object StopIteration]\" ||\n        exception instanceof QReturnValue\n    );\n}\n\n// FIXME: Remove this helper and Q.return once ES6 generators are in\n// SpiderMonkey.\nvar QReturnValue;\nif (typeof ReturnValue !== \"undefined\") {\n    QReturnValue = ReturnValue;\n} else {\n    QReturnValue = function (value) {\n        this.value = value;\n    };\n}\n\n// long stack traces\n\nvar STACK_JUMP_SEPARATOR = \"From previous event:\";\n\nfunction makeStackTraceLong(error, promise) {\n    // If possible, transform the error stack trace by removing Node and Q\n    // cruft, then concatenating with the stack trace of `promise`. See #57.\n    if (hasStacks &&\n        promise.stack &&\n        typeof error === \"object\" &&\n        error !== null &&\n        error.stack &&\n        error.stack.indexOf(STACK_JUMP_SEPARATOR) === -1\n    ) {\n        var stacks = [];\n        for (var p = promise; !!p; p = p.source) {\n            if (p.stack) {\n                stacks.unshift(p.stack);\n            }\n        }\n        stacks.unshift(error.stack);\n\n        var concatedStacks = stacks.join(\"\\n\" + STACK_JUMP_SEPARATOR + \"\\n\");\n        error.stack = filterStackString(concatedStacks);\n    }\n}\n\nfunction filterStackString(stackString) {\n    var lines = stackString.split(\"\\n\");\n    var desiredLines = [];\n    for (var i = 0; i < lines.length; ++i) {\n        var line = lines[i];\n\n        if (!isInternalFrame(line) && !isNodeFrame(line) && line) {\n            desiredLines.push(line);\n        }\n    }\n    return desiredLines.join(\"\\n\");\n}\n\nfunction isNodeFrame(stackLine) {\n    return stackLine.indexOf(\"(module.js:\") !== -1 ||\n           stackLine.indexOf(\"(node.js:\") !== -1;\n}\n\nfunction getFileNameAndLineNumber(stackLine) {\n    // Named functions: \"at functionName (filename:lineNumber:columnNumber)\"\n    // In IE10 function name can have spaces (\"Anonymous function\") O_o\n    var attempt1 = /at .+ \\((.+):(\\d+):(?:\\d+)\\)$/.exec(stackLine);\n    if (attempt1) {\n        return [attempt1[1], Number(attempt1[2])];\n    }\n\n    // Anonymous functions: \"at filename:lineNumber:columnNumber\"\n    var attempt2 = /at ([^ ]+):(\\d+):(?:\\d+)$/.exec(stackLine);\n    if (attempt2) {\n        return [attempt2[1], Number(attempt2[2])];\n    }\n\n    // Firefox style: \"function@filename:lineNumber or @filename:lineNumber\"\n    var attempt3 = /.*@(.+):(\\d+)$/.exec(stackLine);\n    if (attempt3) {\n        return [attempt3[1], Number(attempt3[2])];\n    }\n}\n\nfunction isInternalFrame(stackLine) {\n    var fileNameAndLineNumber = getFileNameAndLineNumber(stackLine);\n\n    if (!fileNameAndLineNumber) {\n        return false;\n    }\n\n    var fileName = fileNameAndLineNumber[0];\n    var lineNumber = fileNameAndLineNumber[1];\n\n    return fileName === qFileName &&\n        lineNumber >= qStartingLine &&\n        lineNumber <= qEndingLine;\n}\n\n// discover own file name and line number range for filtering stack\n// traces\nfunction captureLine() {\n    if (!hasStacks) {\n        return;\n    }\n\n    try {\n        throw new Error();\n    } catch (e) {\n        var lines = e.stack.split(\"\\n\");\n        var firstLine = lines[0].indexOf(\"@\") > 0 ? lines[1] : lines[2];\n        var fileNameAndLineNumber = getFileNameAndLineNumber(firstLine);\n        if (!fileNameAndLineNumber) {\n            return;\n        }\n\n        qFileName = fileNameAndLineNumber[0];\n        return fileNameAndLineNumber[1];\n    }\n}\n\nfunction deprecate(callback, name, alternative) {\n    return function () {\n        if (typeof console !== \"undefined\" &&\n            typeof console.warn === \"function\") {\n            console.warn(name + \" is deprecated, use \" + alternative +\n                         \" instead.\", new Error(\"\").stack);\n        }\n        return callback.apply(callback, arguments);\n    };\n}\n\n// end of shims\n// beginning of real work\n\n/**\n * Constructs a promise for an immediate reference, passes promises through, or\n * coerces promises from different systems.\n * @param value immediate reference or promise\n */\nfunction Q(value) {\n    // If the object is already a Promise, return it directly.  This enables\n    // the resolve function to both be used to created references from objects,\n    // but to tolerably coerce non-promises to promises.\n    if (value instanceof Promise) {\n        return value;\n    }\n\n    // assimilate thenables\n    if (isPromiseAlike(value)) {\n        return coerce(value);\n    } else {\n        return fulfill(value);\n    }\n}\nQ.resolve = Q;\n\n/**\n * Performs a task in a future turn of the event loop.\n * @param {Function} task\n */\nQ.nextTick = nextTick;\n\n/**\n * Controls whether or not long stack traces will be on\n */\nQ.longStackSupport = false;\n\n// enable long stacks if Q_DEBUG is set\nif (typeof process === \"object\" && process && process.env && process.env.Q_DEBUG) {\n    Q.longStackSupport = true;\n}\n\n/**\n * Constructs a {promise, resolve, reject} object.\n *\n * `resolve` is a callback to invoke with a more resolved value for the\n * promise. To fulfill the promise, invoke `resolve` with any value that is\n * not a thenable. To reject the promise, invoke `resolve` with a rejected\n * thenable, or invoke `reject` with the reason directly. To resolve the\n * promise to another thenable, thus putting it in the same state, invoke\n * `resolve` with that other thenable.\n */\nQ.defer = defer;\nfunction defer() {\n    // if \"messages\" is an \"Array\", that indicates that the promise has not yet\n    // been resolved.  If it is \"undefined\", it has been resolved.  Each\n    // element of the messages array is itself an array of complete arguments to\n    // forward to the resolved promise.  We coerce the resolution value to a\n    // promise using the `resolve` function because it handles both fully\n    // non-thenable values and other thenables gracefully.\n    var messages = [], progressListeners = [], resolvedPromise;\n\n    var deferred = object_create(defer.prototype);\n    var promise = object_create(Promise.prototype);\n\n    promise.promiseDispatch = function (resolve, op, operands) {\n        var args = array_slice(arguments);\n        if (messages) {\n            messages.push(args);\n            if (op === \"when\" && operands[1]) { // progress operand\n                progressListeners.push(operands[1]);\n            }\n        } else {\n            Q.nextTick(function () {\n                resolvedPromise.promiseDispatch.apply(resolvedPromise, args);\n            });\n        }\n    };\n\n    // XXX deprecated\n    promise.valueOf = function () {\n        if (messages) {\n            return promise;\n        }\n        var nearerValue = nearer(resolvedPromise);\n        if (isPromise(nearerValue)) {\n            resolvedPromise = nearerValue; // shorten chain\n        }\n        return nearerValue;\n    };\n\n    promise.inspect = function () {\n        if (!resolvedPromise) {\n            return { state: \"pending\" };\n        }\n        return resolvedPromise.inspect();\n    };\n\n    if (Q.longStackSupport && hasStacks) {\n        try {\n            throw new Error();\n        } catch (e) {\n            // NOTE: don't try to use `Error.captureStackTrace` or transfer the\n            // accessor around; that causes memory leaks as per GH-111. Just\n            // reify the stack trace as a string ASAP.\n            //\n            // At the same time, cut off the first line; it's always just\n            // \"[object Promise]\\n\", as per the `toString`.\n            promise.stack = e.stack.substring(e.stack.indexOf(\"\\n\") + 1);\n        }\n    }\n\n    // NOTE: we do the checks for `resolvedPromise` in each method, instead of\n    // consolidating them into `become`, since otherwise we'd create new\n    // promises with the lines `become(whatever(value))`. See e.g. GH-252.\n\n    function become(newPromise) {\n        resolvedPromise = newPromise;\n        promise.source = newPromise;\n\n        array_reduce(messages, function (undefined, message) {\n            Q.nextTick(function () {\n                newPromise.promiseDispatch.apply(newPromise, message);\n            });\n        }, void 0);\n\n        messages = void 0;\n        progressListeners = void 0;\n    }\n\n    deferred.promise = promise;\n    deferred.resolve = function (value) {\n        if (resolvedPromise) {\n            return;\n        }\n\n        become(Q(value));\n    };\n\n    deferred.fulfill = function (value) {\n        if (resolvedPromise) {\n            return;\n        }\n\n        become(fulfill(value));\n    };\n    deferred.reject = function (reason) {\n        if (resolvedPromise) {\n            return;\n        }\n\n        become(reject(reason));\n    };\n    deferred.notify = function (progress) {\n        if (resolvedPromise) {\n            return;\n        }\n\n        array_reduce(progressListeners, function (undefined, progressListener) {\n            Q.nextTick(function () {\n                progressListener(progress);\n            });\n        }, void 0);\n    };\n\n    return deferred;\n}\n\n/**\n * Creates a Node-style callback that will resolve or reject the deferred\n * promise.\n * @returns a nodeback\n */\ndefer.prototype.makeNodeResolver = function () {\n    var self = this;\n    return function (error, value) {\n        if (error) {\n            self.reject(error);\n        } else if (arguments.length > 2) {\n            self.resolve(array_slice(arguments, 1));\n        } else {\n            self.resolve(value);\n        }\n    };\n};\n\n/**\n * @param resolver {Function} a function that returns nothing and accepts\n * the resolve, reject, and notify functions for a deferred.\n * @returns a promise that may be resolved with the given resolve and reject\n * functions, or rejected by a thrown exception in resolver\n */\nQ.Promise = promise; // ES6\nQ.promise = promise;\nfunction promise(resolver) {\n    if (typeof resolver !== \"function\") {\n        throw new TypeError(\"resolver must be a function.\");\n    }\n    var deferred = defer();\n    try {\n        resolver(deferred.resolve, deferred.reject, deferred.notify);\n    } catch (reason) {\n        deferred.reject(reason);\n    }\n    return deferred.promise;\n}\n\npromise.race = race; // ES6\npromise.all = all; // ES6\npromise.reject = reject; // ES6\npromise.resolve = Q; // ES6\n\n// XXX experimental.  This method is a way to denote that a local value is\n// serializable and should be immediately dispatched to a remote upon request,\n// instead of passing a reference.\nQ.passByCopy = function (object) {\n    //freeze(object);\n    //passByCopies.set(object, true);\n    return object;\n};\n\nPromise.prototype.passByCopy = function () {\n    //freeze(object);\n    //passByCopies.set(object, true);\n    return this;\n};\n\n/**\n * If two promises eventually fulfill to the same value, promises that value,\n * but otherwise rejects.\n * @param x {Any*}\n * @param y {Any*}\n * @returns {Any*} a promise for x and y if they are the same, but a rejection\n * otherwise.\n *\n */\nQ.join = function (x, y) {\n    return Q(x).join(y);\n};\n\nPromise.prototype.join = function (that) {\n    return Q([this, that]).spread(function (x, y) {\n        if (x === y) {\n            // TODO: \"===\" should be Object.is or equiv\n            return x;\n        } else {\n            throw new Error(\"Can't join: not the same: \" + x + \" \" + y);\n        }\n    });\n};\n\n/**\n * Returns a promise for the first of an array of promises to become settled.\n * @param answers {Array[Any*]} promises to race\n * @returns {Any*} the first promise to be settled\n */\nQ.race = race;\nfunction race(answerPs) {\n    return promise(function (resolve, reject) {\n        // Switch to this once we can assume at least ES5\n        // answerPs.forEach(function (answerP) {\n        //     Q(answerP).then(resolve, reject);\n        // });\n        // Use this in the meantime\n        for (var i = 0, len = answerPs.length; i < len; i++) {\n            Q(answerPs[i]).then(resolve, reject);\n        }\n    });\n}\n\nPromise.prototype.race = function () {\n    return this.then(Q.race);\n};\n\n/**\n * Constructs a Promise with a promise descriptor object and optional fallback\n * function.  The descriptor contains methods like when(rejected), get(name),\n * set(name, value), post(name, args), and delete(name), which all\n * return either a value, a promise for a value, or a rejection.  The fallback\n * accepts the operation name, a resolver, and any further arguments that would\n * have been forwarded to the appropriate method above had a method been\n * provided with the proper name.  The API makes no guarantees about the nature\n * of the returned object, apart from that it is usable whereever promises are\n * bought and sold.\n */\nQ.makePromise = Promise;\nfunction Promise(descriptor, fallback, inspect) {\n    if (fallback === void 0) {\n        fallback = function (op) {\n            return reject(new Error(\n                \"Promise does not support operation: \" + op\n            ));\n        };\n    }\n    if (inspect === void 0) {\n        inspect = function () {\n            return {state: \"unknown\"};\n        };\n    }\n\n    var promise = object_create(Promise.prototype);\n\n    promise.promiseDispatch = function (resolve, op, args) {\n        var result;\n        try {\n            if (descriptor[op]) {\n                result = descriptor[op].apply(promise, args);\n            } else {\n                result = fallback.call(promise, op, args);\n            }\n        } catch (exception) {\n            result = reject(exception);\n        }\n        if (resolve) {\n            resolve(result);\n        }\n    };\n\n    promise.inspect = inspect;\n\n    // XXX deprecated `valueOf` and `exception` support\n    if (inspect) {\n        var inspected = inspect();\n        if (inspected.state === \"rejected\") {\n            promise.exception = inspected.reason;\n        }\n\n        promise.valueOf = function () {\n            var inspected = inspect();\n            if (inspected.state === \"pending\" ||\n                inspected.state === \"rejected\") {\n                return promise;\n            }\n            return inspected.value;\n        };\n    }\n\n    return promise;\n}\n\nPromise.prototype.toString = function () {\n    return \"[object Promise]\";\n};\n\nPromise.prototype.then = function (fulfilled, rejected, progressed) {\n    var self = this;\n    var deferred = defer();\n    var done = false;   // ensure the untrusted promise makes at most a\n                        // single call to one of the callbacks\n\n    function _fulfilled(value) {\n        try {\n            return typeof fulfilled === \"function\" ? fulfilled(value) : value;\n        } catch (exception) {\n            return reject(exception);\n        }\n    }\n\n    function _rejected(exception) {\n        if (typeof rejected === \"function\") {\n            makeStackTraceLong(exception, self);\n            try {\n                return rejected(exception);\n            } catch (newException) {\n                return reject(newException);\n            }\n        }\n        return reject(exception);\n    }\n\n    function _progressed(value) {\n        return typeof progressed === \"function\" ? progressed(value) : value;\n    }\n\n    Q.nextTick(function () {\n        self.promiseDispatch(function (value) {\n            if (done) {\n                return;\n            }\n            done = true;\n\n            deferred.resolve(_fulfilled(value));\n        }, \"when\", [function (exception) {\n            if (done) {\n                return;\n            }\n            done = true;\n\n            deferred.resolve(_rejected(exception));\n        }]);\n    });\n\n    // Progress propagator need to be attached in the current tick.\n    self.promiseDispatch(void 0, \"when\", [void 0, function (value) {\n        var newValue;\n        var threw = false;\n        try {\n            newValue = _progressed(value);\n        } catch (e) {\n            threw = true;\n            if (Q.onerror) {\n                Q.onerror(e);\n            } else {\n                throw e;\n            }\n        }\n\n        if (!threw) {\n            deferred.notify(newValue);\n        }\n    }]);\n\n    return deferred.promise;\n};\n\nQ.tap = function (promise, callback) {\n    return Q(promise).tap(callback);\n};\n\n/**\n * Works almost like \"finally\", but not called for rejections.\n * Original resolution value is passed through callback unaffected.\n * Callback may return a promise that will be awaited for.\n * @param {Function} callback\n * @returns {Q.Promise}\n * @example\n * doSomething()\n *   .then(...)\n *   .tap(console.log)\n *   .then(...);\n */\nPromise.prototype.tap = function (callback) {\n    callback = Q(callback);\n\n    return this.then(function (value) {\n        return callback.fcall(value).thenResolve(value);\n    });\n};\n\n/**\n * Registers an observer on a promise.\n *\n * Guarantees:\n *\n * 1. that fulfilled and rejected will be called only once.\n * 2. that either the fulfilled callback or the rejected callback will be\n *    called, but not both.\n * 3. that fulfilled and rejected will not be called in this turn.\n *\n * @param value      promise or immediate reference to observe\n * @param fulfilled  function to be called with the fulfilled value\n * @param rejected   function to be called with the rejection exception\n * @param progressed function to be called on any progress notifications\n * @return promise for the return value from the invoked callback\n */\nQ.when = when;\nfunction when(value, fulfilled, rejected, progressed) {\n    return Q(value).then(fulfilled, rejected, progressed);\n}\n\nPromise.prototype.thenResolve = function (value) {\n    return this.then(function () { return value; });\n};\n\nQ.thenResolve = function (promise, value) {\n    return Q(promise).thenResolve(value);\n};\n\nPromise.prototype.thenReject = function (reason) {\n    return this.then(function () { throw reason; });\n};\n\nQ.thenReject = function (promise, reason) {\n    return Q(promise).thenReject(reason);\n};\n\n/**\n * If an object is not a promise, it is as \"near\" as possible.\n * If a promise is rejected, it is as \"near\" as possible too.\n * If it’s a fulfilled promise, the fulfillment value is nearer.\n * If it’s a deferred promise and the deferred has been resolved, the\n * resolution is \"nearer\".\n * @param object\n * @returns most resolved (nearest) form of the object\n */\n\n// XXX should we re-do this?\nQ.nearer = nearer;\nfunction nearer(value) {\n    if (isPromise(value)) {\n        var inspected = value.inspect();\n        if (inspected.state === \"fulfilled\") {\n            return inspected.value;\n        }\n    }\n    return value;\n}\n\n/**\n * @returns whether the given object is a promise.\n * Otherwise it is a fulfilled value.\n */\nQ.isPromise = isPromise;\nfunction isPromise(object) {\n    return object instanceof Promise;\n}\n\nQ.isPromiseAlike = isPromiseAlike;\nfunction isPromiseAlike(object) {\n    return isObject(object) && typeof object.then === \"function\";\n}\n\n/**\n * @returns whether the given object is a pending promise, meaning not\n * fulfilled or rejected.\n */\nQ.isPending = isPending;\nfunction isPending(object) {\n    return isPromise(object) && object.inspect().state === \"pending\";\n}\n\nPromise.prototype.isPending = function () {\n    return this.inspect().state === \"pending\";\n};\n\n/**\n * @returns whether the given object is a value or fulfilled\n * promise.\n */\nQ.isFulfilled = isFulfilled;\nfunction isFulfilled(object) {\n    return !isPromise(object) || object.inspect().state === \"fulfilled\";\n}\n\nPromise.prototype.isFulfilled = function () {\n    return this.inspect().state === \"fulfilled\";\n};\n\n/**\n * @returns whether the given object is a rejected promise.\n */\nQ.isRejected = isRejected;\nfunction isRejected(object) {\n    return isPromise(object) && object.inspect().state === \"rejected\";\n}\n\nPromise.prototype.isRejected = function () {\n    return this.inspect().state === \"rejected\";\n};\n\n//// BEGIN UNHANDLED REJECTION TRACKING\n\n// This promise library consumes exceptions thrown in handlers so they can be\n// handled by a subsequent promise.  The exceptions get added to this array when\n// they are created, and removed when they are handled.  Note that in ES6 or\n// shimmed environments, this would naturally be a `Set`.\nvar unhandledReasons = [];\nvar unhandledRejections = [];\nvar reportedUnhandledRejections = [];\nvar trackUnhandledRejections = true;\n\nfunction resetUnhandledRejections() {\n    unhandledReasons.length = 0;\n    unhandledRejections.length = 0;\n\n    if (!trackUnhandledRejections) {\n        trackUnhandledRejections = true;\n    }\n}\n\nfunction trackRejection(promise, reason) {\n    if (!trackUnhandledRejections) {\n        return;\n    }\n    if (typeof process === \"object\" && typeof process.emit === \"function\") {\n        Q.nextTick.runAfter(function () {\n            if (array_indexOf(unhandledRejections, promise) !== -1) {\n                process.emit(\"unhandledRejection\", reason, promise);\n                reportedUnhandledRejections.push(promise);\n            }\n        });\n    }\n\n    unhandledRejections.push(promise);\n    if (reason && typeof reason.stack !== \"undefined\") {\n        unhandledReasons.push(reason.stack);\n    } else {\n        unhandledReasons.push(\"(no stack) \" + reason);\n    }\n}\n\nfunction untrackRejection(promise) {\n    if (!trackUnhandledRejections) {\n        return;\n    }\n\n    var at = array_indexOf(unhandledRejections, promise);\n    if (at !== -1) {\n        if (typeof process === \"object\" && typeof process.emit === \"function\") {\n            Q.nextTick.runAfter(function () {\n                var atReport = array_indexOf(reportedUnhandledRejections, promise);\n                if (atReport !== -1) {\n                    process.emit(\"rejectionHandled\", unhandledReasons[at], promise);\n                    reportedUnhandledRejections.splice(atReport, 1);\n                }\n            });\n        }\n        unhandledRejections.splice(at, 1);\n        unhandledReasons.splice(at, 1);\n    }\n}\n\nQ.resetUnhandledRejections = resetUnhandledRejections;\n\nQ.getUnhandledReasons = function () {\n    // Make a copy so that consumers can't interfere with our internal state.\n    return unhandledReasons.slice();\n};\n\nQ.stopUnhandledRejectionTracking = function () {\n    resetUnhandledRejections();\n    trackUnhandledRejections = false;\n};\n\nresetUnhandledRejections();\n\n//// END UNHANDLED REJECTION TRACKING\n\n/**\n * Constructs a rejected promise.\n * @param reason value describing the failure\n */\nQ.reject = reject;\nfunction reject(reason) {\n    var rejection = Promise({\n        \"when\": function (rejected) {\n            // note that the error has been handled\n            if (rejected) {\n                untrackRejection(this);\n            }\n            return rejected ? rejected(reason) : this;\n        }\n    }, function fallback() {\n        return this;\n    }, function inspect() {\n        return { state: \"rejected\", reason: reason };\n    });\n\n    // Note that the reason has not been handled.\n    trackRejection(rejection, reason);\n\n    return rejection;\n}\n\n/**\n * Constructs a fulfilled promise for an immediate reference.\n * @param value immediate reference\n */\nQ.fulfill = fulfill;\nfunction fulfill(value) {\n    return Promise({\n        \"when\": function () {\n            return value;\n        },\n        \"get\": function (name) {\n            return value[name];\n        },\n        \"set\": function (name, rhs) {\n            value[name] = rhs;\n        },\n        \"delete\": function (name) {\n            delete value[name];\n        },\n        \"post\": function (name, args) {\n            // Mark Miller proposes that post with no name should apply a\n            // promised function.\n            if (name === null || name === void 0) {\n                return value.apply(void 0, args);\n            } else {\n                return value[name].apply(value, args);\n            }\n        },\n        \"apply\": function (thisp, args) {\n            return value.apply(thisp, args);\n        },\n        \"keys\": function () {\n            return object_keys(value);\n        }\n    }, void 0, function inspect() {\n        return { state: \"fulfilled\", value: value };\n    });\n}\n\n/**\n * Converts thenables to Q promises.\n * @param promise thenable promise\n * @returns a Q promise\n */\nfunction coerce(promise) {\n    var deferred = defer();\n    Q.nextTick(function () {\n        try {\n            promise.then(deferred.resolve, deferred.reject, deferred.notify);\n        } catch (exception) {\n            deferred.reject(exception);\n        }\n    });\n    return deferred.promise;\n}\n\n/**\n * Annotates an object such that it will never be\n * transferred away from this process over any promise\n * communication channel.\n * @param object\n * @returns promise a wrapping of that object that\n * additionally responds to the \"isDef\" message\n * without a rejection.\n */\nQ.master = master;\nfunction master(object) {\n    return Promise({\n        \"isDef\": function () {}\n    }, function fallback(op, args) {\n        return dispatch(object, op, args);\n    }, function () {\n        return Q(object).inspect();\n    });\n}\n\n/**\n * Spreads the values of a promised array of arguments into the\n * fulfillment callback.\n * @param fulfilled callback that receives variadic arguments from the\n * promised array\n * @param rejected callback that receives the exception if the promise\n * is rejected.\n * @returns a promise for the return value or thrown exception of\n * either callback.\n */\nQ.spread = spread;\nfunction spread(value, fulfilled, rejected) {\n    return Q(value).spread(fulfilled, rejected);\n}\n\nPromise.prototype.spread = function (fulfilled, rejected) {\n    return this.all().then(function (array) {\n        return fulfilled.apply(void 0, array);\n    }, rejected);\n};\n\n/**\n * The async function is a decorator for generator functions, turning\n * them into asynchronous generators.  Although generators are only part\n * of the newest ECMAScript 6 drafts, this code does not cause syntax\n * errors in older engines.  This code should continue to work and will\n * in fact improve over time as the language improves.\n *\n * ES6 generators are currently part of V8 version 3.19 with the\n * --harmony-generators runtime flag enabled.  SpiderMonkey has had them\n * for longer, but under an older Python-inspired form.  This function\n * works on both kinds of generators.\n *\n * Decorates a generator function such that:\n *  - it may yield promises\n *  - execution will continue when that promise is fulfilled\n *  - the value of the yield expression will be the fulfilled value\n *  - it returns a promise for the return value (when the generator\n *    stops iterating)\n *  - the decorated function returns a promise for the return value\n *    of the generator or the first rejected promise among those\n *    yielded.\n *  - if an error is thrown in the generator, it propagates through\n *    every following yield until it is caught, or until it escapes\n *    the generator function altogether, and is translated into a\n *    rejection for the promise returned by the decorated generator.\n */\nQ.async = async;\nfunction async(makeGenerator) {\n    return function () {\n        // when verb is \"send\", arg is a value\n        // when verb is \"throw\", arg is an exception\n        function continuer(verb, arg) {\n            var result;\n\n            // Until V8 3.19 / Chromium 29 is released, SpiderMonkey is the only\n            // engine that has a deployed base of browsers that support generators.\n            // However, SM's generators use the Python-inspired semantics of\n            // outdated ES6 drafts.  We would like to support ES6, but we'd also\n            // like to make it possible to use generators in deployed browsers, so\n            // we also support Python-style generators.  At some point we can remove\n            // this block.\n\n            if (typeof StopIteration === \"undefined\") {\n                // ES6 Generators\n                try {\n                    result = generator[verb](arg);\n                } catch (exception) {\n                    return reject(exception);\n                }\n                if (result.done) {\n                    return Q(result.value);\n                } else {\n                    return when(result.value, callback, errback);\n                }\n            } else {\n                // SpiderMonkey Generators\n                // FIXME: Remove this case when SM does ES6 generators.\n                try {\n                    result = generator[verb](arg);\n                } catch (exception) {\n                    if (isStopIteration(exception)) {\n                        return Q(exception.value);\n                    } else {\n                        return reject(exception);\n                    }\n                }\n                return when(result, callback, errback);\n            }\n        }\n        var generator = makeGenerator.apply(this, arguments);\n        var callback = continuer.bind(continuer, \"next\");\n        var errback = continuer.bind(continuer, \"throw\");\n        return callback();\n    };\n}\n\n/**\n * The spawn function is a small wrapper around async that immediately\n * calls the generator and also ends the promise chain, so that any\n * unhandled errors are thrown instead of forwarded to the error\n * handler. This is useful because it's extremely common to run\n * generators at the top-level to work with libraries.\n */\nQ.spawn = spawn;\nfunction spawn(makeGenerator) {\n    Q.done(Q.async(makeGenerator)());\n}\n\n// FIXME: Remove this interface once ES6 generators are in SpiderMonkey.\n/**\n * Throws a ReturnValue exception to stop an asynchronous generator.\n *\n * This interface is a stop-gap measure to support generator return\n * values in older Firefox/SpiderMonkey.  In browsers that support ES6\n * generators like Chromium 29, just use \"return\" in your generator\n * functions.\n *\n * @param value the return value for the surrounding generator\n * @throws ReturnValue exception with the value.\n * @example\n * // ES6 style\n * Q.async(function* () {\n *      var foo = yield getFooPromise();\n *      var bar = yield getBarPromise();\n *      return foo + bar;\n * })\n * // Older SpiderMonkey style\n * Q.async(function () {\n *      var foo = yield getFooPromise();\n *      var bar = yield getBarPromise();\n *      Q.return(foo + bar);\n * })\n */\nQ[\"return\"] = _return;\nfunction _return(value) {\n    throw new QReturnValue(value);\n}\n\n/**\n * The promised function decorator ensures that any promise arguments\n * are settled and passed as values (`this` is also settled and passed\n * as a value).  It will also ensure that the result of a function is\n * always a promise.\n *\n * @example\n * var add = Q.promised(function (a, b) {\n *     return a + b;\n * });\n * add(Q(a), Q(B));\n *\n * @param {function} callback The function to decorate\n * @returns {function} a function that has been decorated.\n */\nQ.promised = promised;\nfunction promised(callback) {\n    return function () {\n        return spread([this, all(arguments)], function (self, args) {\n            return callback.apply(self, args);\n        });\n    };\n}\n\n/**\n * sends a message to a value in a future turn\n * @param object* the recipient\n * @param op the name of the message operation, e.g., \"when\",\n * @param args further arguments to be forwarded to the operation\n * @returns result {Promise} a promise for the result of the operation\n */\nQ.dispatch = dispatch;\nfunction dispatch(object, op, args) {\n    return Q(object).dispatch(op, args);\n}\n\nPromise.prototype.dispatch = function (op, args) {\n    var self = this;\n    var deferred = defer();\n    Q.nextTick(function () {\n        self.promiseDispatch(deferred.resolve, op, args);\n    });\n    return deferred.promise;\n};\n\n/**\n * Gets the value of a property in a future turn.\n * @param object    promise or immediate reference for target object\n * @param name      name of property to get\n * @return promise for the property value\n */\nQ.get = function (object, key) {\n    return Q(object).dispatch(\"get\", [key]);\n};\n\nPromise.prototype.get = function (key) {\n    return this.dispatch(\"get\", [key]);\n};\n\n/**\n * Sets the value of a property in a future turn.\n * @param object    promise or immediate reference for object object\n * @param name      name of property to set\n * @param value     new value of property\n * @return promise for the return value\n */\nQ.set = function (object, key, value) {\n    return Q(object).dispatch(\"set\", [key, value]);\n};\n\nPromise.prototype.set = function (key, value) {\n    return this.dispatch(\"set\", [key, value]);\n};\n\n/**\n * Deletes a property in a future turn.\n * @param object    promise or immediate reference for target object\n * @param name      name of property to delete\n * @return promise for the return value\n */\nQ.del = // XXX legacy\nQ[\"delete\"] = function (object, key) {\n    return Q(object).dispatch(\"delete\", [key]);\n};\n\nPromise.prototype.del = // XXX legacy\nPromise.prototype[\"delete\"] = function (key) {\n    return this.dispatch(\"delete\", [key]);\n};\n\n/**\n * Invokes a method in a future turn.\n * @param object    promise or immediate reference for target object\n * @param name      name of method to invoke\n * @param value     a value to post, typically an array of\n *                  invocation arguments for promises that\n *                  are ultimately backed with `resolve` values,\n *                  as opposed to those backed with URLs\n *                  wherein the posted value can be any\n *                  JSON serializable object.\n * @return promise for the return value\n */\n// bound locally because it is used by other methods\nQ.mapply = // XXX As proposed by \"Redsandro\"\nQ.post = function (object, name, args) {\n    return Q(object).dispatch(\"post\", [name, args]);\n};\n\nPromise.prototype.mapply = // XXX As proposed by \"Redsandro\"\nPromise.prototype.post = function (name, args) {\n    return this.dispatch(\"post\", [name, args]);\n};\n\n/**\n * Invokes a method in a future turn.\n * @param object    promise or immediate reference for target object\n * @param name      name of method to invoke\n * @param ...args   array of invocation arguments\n * @return promise for the return value\n */\nQ.send = // XXX Mark Miller's proposed parlance\nQ.mcall = // XXX As proposed by \"Redsandro\"\nQ.invoke = function (object, name /*...args*/) {\n    return Q(object).dispatch(\"post\", [name, array_slice(arguments, 2)]);\n};\n\nPromise.prototype.send = // XXX Mark Miller's proposed parlance\nPromise.prototype.mcall = // XXX As proposed by \"Redsandro\"\nPromise.prototype.invoke = function (name /*...args*/) {\n    return this.dispatch(\"post\", [name, array_slice(arguments, 1)]);\n};\n\n/**\n * Applies the promised function in a future turn.\n * @param object    promise or immediate reference for target function\n * @param args      array of application arguments\n */\nQ.fapply = function (object, args) {\n    return Q(object).dispatch(\"apply\", [void 0, args]);\n};\n\nPromise.prototype.fapply = function (args) {\n    return this.dispatch(\"apply\", [void 0, args]);\n};\n\n/**\n * Calls the promised function in a future turn.\n * @param object    promise or immediate reference for target function\n * @param ...args   array of application arguments\n */\nQ[\"try\"] =\nQ.fcall = function (object /* ...args*/) {\n    return Q(object).dispatch(\"apply\", [void 0, array_slice(arguments, 1)]);\n};\n\nPromise.prototype.fcall = function (/*...args*/) {\n    return this.dispatch(\"apply\", [void 0, array_slice(arguments)]);\n};\n\n/**\n * Binds the promised function, transforming return values into a fulfilled\n * promise and thrown errors into a rejected one.\n * @param object    promise or immediate reference for target function\n * @param ...args   array of application arguments\n */\nQ.fbind = function (object /*...args*/) {\n    var promise = Q(object);\n    var args = array_slice(arguments, 1);\n    return function fbound() {\n        return promise.dispatch(\"apply\", [\n            this,\n            args.concat(array_slice(arguments))\n        ]);\n    };\n};\nPromise.prototype.fbind = function (/*...args*/) {\n    var promise = this;\n    var args = array_slice(arguments);\n    return function fbound() {\n        return promise.dispatch(\"apply\", [\n            this,\n            args.concat(array_slice(arguments))\n        ]);\n    };\n};\n\n/**\n * Requests the names of the owned properties of a promised\n * object in a future turn.\n * @param object    promise or immediate reference for target object\n * @return promise for the keys of the eventually settled object\n */\nQ.keys = function (object) {\n    return Q(object).dispatch(\"keys\", []);\n};\n\nPromise.prototype.keys = function () {\n    return this.dispatch(\"keys\", []);\n};\n\n/**\n * Turns an array of promises into a promise for an array.  If any of\n * the promises gets rejected, the whole array is rejected immediately.\n * @param {Array*} an array (or promise for an array) of values (or\n * promises for values)\n * @returns a promise for an array of the corresponding values\n */\n// By Mark Miller\n// http://wiki.ecmascript.org/doku.php?id=strawman:concurrency&rev=1308776521#allfulfilled\nQ.all = all;\nfunction all(promises) {\n    return when(promises, function (promises) {\n        var pendingCount = 0;\n        var deferred = defer();\n        array_reduce(promises, function (undefined, promise, index) {\n            var snapshot;\n            if (\n                isPromise(promise) &&\n                (snapshot = promise.inspect()).state === \"fulfilled\"\n            ) {\n                promises[index] = snapshot.value;\n            } else {\n                ++pendingCount;\n                when(\n                    promise,\n                    function (value) {\n                        promises[index] = value;\n                        if (--pendingCount === 0) {\n                            deferred.resolve(promises);\n                        }\n                    },\n                    deferred.reject,\n                    function (progress) {\n                        deferred.notify({ index: index, value: progress });\n                    }\n                );\n            }\n        }, void 0);\n        if (pendingCount === 0) {\n            deferred.resolve(promises);\n        }\n        return deferred.promise;\n    });\n}\n\nPromise.prototype.all = function () {\n    return all(this);\n};\n\n/**\n * Returns the first resolved promise of an array. Prior rejected promises are\n * ignored.  Rejects only if all promises are rejected.\n * @param {Array*} an array containing values or promises for values\n * @returns a promise fulfilled with the value of the first resolved promise,\n * or a rejected promise if all promises are rejected.\n */\nQ.any = any;\n\nfunction any(promises) {\n    if (promises.length === 0) {\n        return Q.resolve();\n    }\n\n    var deferred = Q.defer();\n    var pendingCount = 0;\n    array_reduce(promises, function (prev, current, index) {\n        var promise = promises[index];\n\n        pendingCount++;\n\n        when(promise, onFulfilled, onRejected, onProgress);\n        function onFulfilled(result) {\n            deferred.resolve(result);\n        }\n        function onRejected() {\n            pendingCount--;\n            if (pendingCount === 0) {\n                deferred.reject(new Error(\n                    \"Can't get fulfillment value from any promise, all \" +\n                    \"promises were rejected.\"\n                ));\n            }\n        }\n        function onProgress(progress) {\n            deferred.notify({\n                index: index,\n                value: progress\n            });\n        }\n    }, undefined);\n\n    return deferred.promise;\n}\n\nPromise.prototype.any = function () {\n    return any(this);\n};\n\n/**\n * Waits for all promises to be settled, either fulfilled or\n * rejected.  This is distinct from `all` since that would stop\n * waiting at the first rejection.  The promise returned by\n * `allResolved` will never be rejected.\n * @param promises a promise for an array (or an array) of promises\n * (or values)\n * @return a promise for an array of promises\n */\nQ.allResolved = deprecate(allResolved, \"allResolved\", \"allSettled\");\nfunction allResolved(promises) {\n    return when(promises, function (promises) {\n        promises = array_map(promises, Q);\n        return when(all(array_map(promises, function (promise) {\n            return when(promise, noop, noop);\n        })), function () {\n            return promises;\n        });\n    });\n}\n\nPromise.prototype.allResolved = function () {\n    return allResolved(this);\n};\n\n/**\n * @see Promise#allSettled\n */\nQ.allSettled = allSettled;\nfunction allSettled(promises) {\n    return Q(promises).allSettled();\n}\n\n/**\n * Turns an array of promises into a promise for an array of their states (as\n * returned by `inspect`) when they have all settled.\n * @param {Array[Any*]} values an array (or promise for an array) of values (or\n * promises for values)\n * @returns {Array[State]} an array of states for the respective values.\n */\nPromise.prototype.allSettled = function () {\n    return this.then(function (promises) {\n        return all(array_map(promises, function (promise) {\n            promise = Q(promise);\n            function regardless() {\n                return promise.inspect();\n            }\n            return promise.then(regardless, regardless);\n        }));\n    });\n};\n\n/**\n * Captures the failure of a promise, giving an oportunity to recover\n * with a callback.  If the given promise is fulfilled, the returned\n * promise is fulfilled.\n * @param {Any*} promise for something\n * @param {Function} callback to fulfill the returned promise if the\n * given promise is rejected\n * @returns a promise for the return value of the callback\n */\nQ.fail = // XXX legacy\nQ[\"catch\"] = function (object, rejected) {\n    return Q(object).then(void 0, rejected);\n};\n\nPromise.prototype.fail = // XXX legacy\nPromise.prototype[\"catch\"] = function (rejected) {\n    return this.then(void 0, rejected);\n};\n\n/**\n * Attaches a listener that can respond to progress notifications from a\n * promise's originating deferred. This listener receives the exact arguments\n * passed to ``deferred.notify``.\n * @param {Any*} promise for something\n * @param {Function} callback to receive any progress notifications\n * @returns the given promise, unchanged\n */\nQ.progress = progress;\nfunction progress(object, progressed) {\n    return Q(object).then(void 0, void 0, progressed);\n}\n\nPromise.prototype.progress = function (progressed) {\n    return this.then(void 0, void 0, progressed);\n};\n\n/**\n * Provides an opportunity to observe the settling of a promise,\n * regardless of whether the promise is fulfilled or rejected.  Forwards\n * the resolution to the returned promise when the callback is done.\n * The callback can return a promise to defer completion.\n * @param {Any*} promise\n * @param {Function} callback to observe the resolution of the given\n * promise, takes no arguments.\n * @returns a promise for the resolution of the given promise when\n * ``fin`` is done.\n */\nQ.fin = // XXX legacy\nQ[\"finally\"] = function (object, callback) {\n    return Q(object)[\"finally\"](callback);\n};\n\nPromise.prototype.fin = // XXX legacy\nPromise.prototype[\"finally\"] = function (callback) {\n    callback = Q(callback);\n    return this.then(function (value) {\n        return callback.fcall().then(function () {\n            return value;\n        });\n    }, function (reason) {\n        // TODO attempt to recycle the rejection with \"this\".\n        return callback.fcall().then(function () {\n            throw reason;\n        });\n    });\n};\n\n/**\n * Terminates a chain of promises, forcing rejections to be\n * thrown as exceptions.\n * @param {Any*} promise at the end of a chain of promises\n * @returns nothing\n */\nQ.done = function (object, fulfilled, rejected, progress) {\n    return Q(object).done(fulfilled, rejected, progress);\n};\n\nPromise.prototype.done = function (fulfilled, rejected, progress) {\n    var onUnhandledError = function (error) {\n        // forward to a future turn so that ``when``\n        // does not catch it and turn it into a rejection.\n        Q.nextTick(function () {\n            makeStackTraceLong(error, promise);\n            if (Q.onerror) {\n                Q.onerror(error);\n            } else {\n                throw error;\n            }\n        });\n    };\n\n    // Avoid unnecessary `nextTick`ing via an unnecessary `when`.\n    var promise = fulfilled || rejected || progress ?\n        this.then(fulfilled, rejected, progress) :\n        this;\n\n    if (typeof process === \"object\" && process && process.domain) {\n        onUnhandledError = process.domain.bind(onUnhandledError);\n    }\n\n    promise.then(void 0, onUnhandledError);\n};\n\n/**\n * Causes a promise to be rejected if it does not get fulfilled before\n * some milliseconds time out.\n * @param {Any*} promise\n * @param {Number} milliseconds timeout\n * @param {Any*} custom error message or Error object (optional)\n * @returns a promise for the resolution of the given promise if it is\n * fulfilled before the timeout, otherwise rejected.\n */\nQ.timeout = function (object, ms, error) {\n    return Q(object).timeout(ms, error);\n};\n\nPromise.prototype.timeout = function (ms, error) {\n    var deferred = defer();\n    var timeoutId = setTimeout(function () {\n        if (!error || \"string\" === typeof error) {\n            error = new Error(error || \"Timed out after \" + ms + \" ms\");\n            error.code = \"ETIMEDOUT\";\n        }\n        deferred.reject(error);\n    }, ms);\n\n    this.then(function (value) {\n        clearTimeout(timeoutId);\n        deferred.resolve(value);\n    }, function (exception) {\n        clearTimeout(timeoutId);\n        deferred.reject(exception);\n    }, deferred.notify);\n\n    return deferred.promise;\n};\n\n/**\n * Returns a promise for the given value (or promised value), some\n * milliseconds after it resolved. Passes rejections immediately.\n * @param {Any*} promise\n * @param {Number} milliseconds\n * @returns a promise for the resolution of the given promise after milliseconds\n * time has elapsed since the resolution of the given promise.\n * If the given promise rejects, that is passed immediately.\n */\nQ.delay = function (object, timeout) {\n    if (timeout === void 0) {\n        timeout = object;\n        object = void 0;\n    }\n    return Q(object).delay(timeout);\n};\n\nPromise.prototype.delay = function (timeout) {\n    return this.then(function (value) {\n        var deferred = defer();\n        setTimeout(function () {\n            deferred.resolve(value);\n        }, timeout);\n        return deferred.promise;\n    });\n};\n\n/**\n * Passes a continuation to a Node function, which is called with the given\n * arguments provided as an array, and returns a promise.\n *\n *      Q.nfapply(FS.readFile, [__filename])\n *      .then(function (content) {\n *      })\n *\n */\nQ.nfapply = function (callback, args) {\n    return Q(callback).nfapply(args);\n};\n\nPromise.prototype.nfapply = function (args) {\n    var deferred = defer();\n    var nodeArgs = array_slice(args);\n    nodeArgs.push(deferred.makeNodeResolver());\n    this.fapply(nodeArgs).fail(deferred.reject);\n    return deferred.promise;\n};\n\n/**\n * Passes a continuation to a Node function, which is called with the given\n * arguments provided individually, and returns a promise.\n * @example\n * Q.nfcall(FS.readFile, __filename)\n * .then(function (content) {\n * })\n *\n */\nQ.nfcall = function (callback /*...args*/) {\n    var args = array_slice(arguments, 1);\n    return Q(callback).nfapply(args);\n};\n\nPromise.prototype.nfcall = function (/*...args*/) {\n    var nodeArgs = array_slice(arguments);\n    var deferred = defer();\n    nodeArgs.push(deferred.makeNodeResolver());\n    this.fapply(nodeArgs).fail(deferred.reject);\n    return deferred.promise;\n};\n\n/**\n * Wraps a NodeJS continuation passing function and returns an equivalent\n * version that returns a promise.\n * @example\n * Q.nfbind(FS.readFile, __filename)(\"utf-8\")\n * .then(console.log)\n * .done()\n */\nQ.nfbind =\nQ.denodeify = function (callback /*...args*/) {\n    var baseArgs = array_slice(arguments, 1);\n    return function () {\n        var nodeArgs = baseArgs.concat(array_slice(arguments));\n        var deferred = defer();\n        nodeArgs.push(deferred.makeNodeResolver());\n        Q(callback).fapply(nodeArgs).fail(deferred.reject);\n        return deferred.promise;\n    };\n};\n\nPromise.prototype.nfbind =\nPromise.prototype.denodeify = function (/*...args*/) {\n    var args = array_slice(arguments);\n    args.unshift(this);\n    return Q.denodeify.apply(void 0, args);\n};\n\nQ.nbind = function (callback, thisp /*...args*/) {\n    var baseArgs = array_slice(arguments, 2);\n    return function () {\n        var nodeArgs = baseArgs.concat(array_slice(arguments));\n        var deferred = defer();\n        nodeArgs.push(deferred.makeNodeResolver());\n        function bound() {\n            return callback.apply(thisp, arguments);\n        }\n        Q(bound).fapply(nodeArgs).fail(deferred.reject);\n        return deferred.promise;\n    };\n};\n\nPromise.prototype.nbind = function (/*thisp, ...args*/) {\n    var args = array_slice(arguments, 0);\n    args.unshift(this);\n    return Q.nbind.apply(void 0, args);\n};\n\n/**\n * Calls a method of a Node-style object that accepts a Node-style\n * callback with a given array of arguments, plus a provided callback.\n * @param object an object that has the named method\n * @param {String} name name of the method of object\n * @param {Array} args arguments to pass to the method; the callback\n * will be provided by Q and appended to these arguments.\n * @returns a promise for the value or error\n */\nQ.nmapply = // XXX As proposed by \"Redsandro\"\nQ.npost = function (object, name, args) {\n    return Q(object).npost(name, args);\n};\n\nPromise.prototype.nmapply = // XXX As proposed by \"Redsandro\"\nPromise.prototype.npost = function (name, args) {\n    var nodeArgs = array_slice(args || []);\n    var deferred = defer();\n    nodeArgs.push(deferred.makeNodeResolver());\n    this.dispatch(\"post\", [name, nodeArgs]).fail(deferred.reject);\n    return deferred.promise;\n};\n\n/**\n * Calls a method of a Node-style object that accepts a Node-style\n * callback, forwarding the given variadic arguments, plus a provided\n * callback argument.\n * @param object an object that has the named method\n * @param {String} name name of the method of object\n * @param ...args arguments to pass to the method; the callback will\n * be provided by Q and appended to these arguments.\n * @returns a promise for the value or error\n */\nQ.nsend = // XXX Based on Mark Miller's proposed \"send\"\nQ.nmcall = // XXX Based on \"Redsandro's\" proposal\nQ.ninvoke = function (object, name /*...args*/) {\n    var nodeArgs = array_slice(arguments, 2);\n    var deferred = defer();\n    nodeArgs.push(deferred.makeNodeResolver());\n    Q(object).dispatch(\"post\", [name, nodeArgs]).fail(deferred.reject);\n    return deferred.promise;\n};\n\nPromise.prototype.nsend = // XXX Based on Mark Miller's proposed \"send\"\nPromise.prototype.nmcall = // XXX Based on \"Redsandro's\" proposal\nPromise.prototype.ninvoke = function (name /*...args*/) {\n    var nodeArgs = array_slice(arguments, 1);\n    var deferred = defer();\n    nodeArgs.push(deferred.makeNodeResolver());\n    this.dispatch(\"post\", [name, nodeArgs]).fail(deferred.reject);\n    return deferred.promise;\n};\n\n/**\n * If a function would like to support both Node continuation-passing-style and\n * promise-returning-style, it can end its internal promise chain with\n * `nodeify(nodeback)`, forwarding the optional nodeback argument.  If the user\n * elects to use a nodeback, the result will be sent there.  If they do not\n * pass a nodeback, they will receive the result promise.\n * @param object a result (or a promise for a result)\n * @param {Function} nodeback a Node.js-style callback\n * @returns either the promise or nothing\n */\nQ.nodeify = nodeify;\nfunction nodeify(object, nodeback) {\n    return Q(object).nodeify(nodeback);\n}\n\nPromise.prototype.nodeify = function (nodeback) {\n    if (nodeback) {\n        this.then(function (value) {\n            Q.nextTick(function () {\n                nodeback(null, value);\n            });\n        }, function (error) {\n            Q.nextTick(function () {\n                nodeback(error);\n            });\n        });\n    } else {\n        return this;\n    }\n};\n\nQ.noConflict = function() {\n    throw new Error(\"Q.noConflict only works when Q is used as a global\");\n};\n\n// All code before this point will be filtered from stack traces.\nvar qEndingLine = captureLine();\n\nreturn Q;\n\n});\n","var work = require('webworkify');\nvar tojson = require('ngraph.tojson');\nvar eventify = require('ngraph.events');\n\nvar createLayout = require('./lib/createLayout.js');\nvar validateOptions = require('./options.js');\nvar messageKind = require('./lib/messages.js');\n\nmodule.exports = createAsyncLayout;\n\nfunction createAsyncLayout(graph, options) {\n  options = validateOptions(options);\n\n  var assignPosition = options.is3d ? assignPosition3d : assignPosition2d;\n\n  var pendingInitialization = false;\n  var initRequestSent = false;\n  var systemStable = false;\n  var graphRect;\n  var pinStatus = Object.create(null);\n  var linkPositions;\n\n  // Since this is fairly common message, there is no need to recreate it every time:\n  var stepMessage = { kind: messageKind.step };\n\n  var positions = Object.create(null);\n\n  var layoutWorker = work(require('./lib/layoutWorker.js'));\n  layoutWorker.addEventListener('message', handleMessageFromWorker);\n\n  initWorker();\n  initPositions();\n\n  var api = {\n    /**\n     * Request to perform one iteration of force layout. The request is\n     * forwarded to web worker\n     *\n     * @returns {boolean} true if system is considered stable; false otherwise.\n     */\n    step: asyncStep,\n\n    /**\n     * Gets the last known position of a given node by its identifier.\n     *\n     * @param {string} nodeId identifier of a node in question.\n     * @returns {object} {x: number, y: number, z: number} coordinates of a node.\n     */\n    getNodePosition: getNodePosition,\n\n    /**\n     * Gets the last known position of a given link by its identifier.\n     *\n     * @param {string} linkId identifier of a link in question.\n     * @returns {Object} Link position by link id\n     * @returns {Object.from} {x, y} coordinates of link start\n     * @returns {Object.to} {x, y} coordinates of link end\n     */\n    getLinkPosition: getLinkPosition,\n\n    /**\n     * Requests layout algorithm to pin/unpin node to its current position\n     * Pinned nodes should not be affected by layout algorithm and always\n     * remain at their position\n     *\n     * @param {object} node graph node that needs to be pinned\n     * @param {boolean} isPinned status of the node.\n     */\n    pinNode: asyncPinNode,\n\n    /**\n     * Sets position of a node to a given coordinates\n     * @param {string} nodeId node identifier\n     * @param {number} x position of a node\n     * @param {number} y position of a node\n     * @param {number=} z position of node (only if 3d layout)\n     */\n    setNodePosition: asyncNodePosition,\n\n    /**\n     * Gets rectangle (or a box) that bounds the graph\n     */\n    getGraphRect: getGraphRect,\n\n    /**\n     * Returns true if node is currently pinned (i.e. not moved by layout);\n     * False otherwise.\n     */\n    isNodePinned: isNodePinned\n  };\n\n  eventify(api);\n\n  return api;\n\n  function asyncStep() {\n    // we cannot do anything until we receive 'initDone' message from worker\n    // to confirm that it's ready to process layout requests.\n    if (pendingInitialization) return;\n\n    layoutWorker.postMessage(stepMessage);\n\n    // TODO: I need to rewrite ngraph.forcelayout to be even-driven,\n    // so that it can notify caller about stable/unstable change asynchronously\n    return systemStable;\n  }\n\n  function asyncNodePosition(nodeId, x, y, z) {\n    // let layout know that we changed the position\n    layoutWorker.postMessage({\n      kind: messageKind.setNodePosition,\n      payload: {\n        nodeId: nodeId,\n        x: x,\n        y: y,\n        z: z\n      }\n    });\n    // also update synchronously our last remember position:\n    assignPosition(positions[nodeId], { x: x, y: y, z: z });\n  }\n\n  function getGraphRect() {\n    return graphRect;\n  }\n\n  function asyncPinNode(node, isPinned) {\n    layoutWorker.postMessage({\n      kind: messageKind.pinNode,\n      payload: {\n        nodeId: node.id,\n        isPinned: isPinned\n      }\n    });\n\n    // we need to have sync way of answering to isNodePinned request.\n    // This is not perfect, since original graph configuration may\n    // include pinned nodes. We currently do not take that into account.\n    pinStatus[node.id] = isPinned;\n  }\n\n  function isNodePinned(node) {\n    return pinStatus[node.id];\n  }\n\n  function initWorker() {\n    if (initRequestSent) {\n      throw new Error('Init request is already sent to the worker');\n    }\n\n    layoutWorker.postMessage({\n      kind: messageKind.init,\n      payload: {\n        graph: tojson(graph),\n        options: JSON.stringify(options)\n      }\n    });\n\n    initRequestSent = true;\n  }\n\n  function initPositions() {\n    // we need to initialize positions just once\n    var layout = createLayout(graph, options);\n    graph.forEachNode(initPosition);\n    graphRect = layout.getGraphRect();\n\n    function initPosition(node) {\n      positions[node.id] = layout.getNodePosition(node.id);\n    }\n  }\n\n  function getNodePosition(nodeId) {\n    return positions[nodeId];\n  }\n\n  function getLinkPosition(linkId) {\n    if (!linkPositions) {\n      initializeLinkPositions();\n    }\n    return linkPositions[linkId];\n  }\n\n  function initializeLinkPositions() {\n    linkPositions = Object.create(null);\n    graph.forEachLink(function(link) {\n      linkPositions[link.id] = {\n        from: getNodePosition(link.fromId),\n        to: getNodePosition(link.toId)\n      };\n    });\n  }\n\n  function handleMessageFromWorker(message) {\n    var kind = message.data.kind;\n    var payload = message.data.payload\n\n    if (kind === messageKind.cycleComplete) {\n      setPositions(payload.positions, payload.systemStable);\n      graphRect = payload.bbox;\n      api.fire('cycle', payload.iterations, payload.systemStable);\n    } if (kind === messageKind.initDone) {\n      pendingInitialization = false;\n      asyncStep();\n    }\n  }\n\n  function setPositions(newPositions, newSystemStable) {\n    systemStable = newSystemStable;\n    Object.keys(newPositions).forEach(updatePosition);\n    return;\n\n    function updatePosition(nodeId) {\n      var newPosition = newPositions[nodeId];\n      var oldPosition = positions[nodeId];\n      if (!oldPosition) {\n        positions[nodeId] = newPosition;\n      } else {\n        assignPosition(oldPosition, newPosition);\n      }\n    }\n  }\n}\n\nfunction assignPosition3d(oldPos, newPos) {\n  oldPos.x = newPos.x;\n  oldPos.y = newPos.y;\n  oldPos.z = newPos.z;\n}\n\nfunction assignPosition2d(oldPos, newPos) {\n  oldPos.x = newPos.x;\n  oldPos.y = newPos.y;\n}\n","var layout3d = require('ngraph.forcelayout3d');\nvar layout2d = layout3d.get2dLayout;\n\nmodule.exports = createLayout;\n\nfunction createLayout(graph, options) {\n  options = options || {};\n\n  return options.is3d ?\n    layout3d(graph, options.physics) :\n    layout2d(graph, options.physics);\n}\n","var createLayout = require('./createLayout.js');\nvar fromjson = require('ngraph.fromjson');\nvar validateOptions = require('../options.js');\nvar messageKind = require('./messages.js');\n\nmodule.exports = layoutWorker;\n\n/**\n * This method is executed as a webworker thread. It expects 'init' signal\n * from the main thread to start layout.\n */\nfunction layoutWorker(self) {\n  var layout; // main thread will send a message to initialize this\n  var asyncOptions;\n  var completedIterations = 0;\n  var stepCalled = false;\n  var timeoutId = 0;\n  var systemStable = false;\n  var graph;\n\n  var positions = Object.create(null);\n  self.addEventListener('message', handleMessageFromMainThread);\n\n  return; // public API is over. Below are private methods only.\n\n  function handleMessageFromMainThread(message) {\n    var kind = message.data.kind;\n    var payload = message.data.payload;\n\n    if (kind === messageKind.init) {\n      graph = fromjson(payload.graph);\n      var options = JSON.parse(payload.options);\n\n      init(graph, options);\n    } else if (kind === messageKind.step) {\n      step();\n    } else if (kind === messageKind.pinNode) {\n      pinNode(payload.nodeId, payload.isPinned);\n    } else if (kind === messageKind.setNodePosition) {\n      setNodePosition(payload.nodeId, payload.x, payload.y, payload.z);\n    }\n    // TODO: listen for graph changes from main thread and update layout here.\n  }\n\n  function setNodePosition(nodeId, x, y, z) {\n    assertInitialized();\n\n    layout.setNodePosition.apply(layout, arguments);\n    systemStable = false;\n    step();\n  }\n\n  function pinNode(nodeId, isPinned) {\n    assertInitialized();\n\n    var node = graph.getNode(nodeId);\n    if (!node) return; // ignoring right now. should it throw?\n\n    layout.pinNode(node, isPinned);\n  }\n\n  function assertInitialized() {\n    if (!graph) throw new Error('Pin node requested without initialied graph');\n    if (!layout) throw new Error('Layout was not created. Something is really wrong here');\n  }\n\n  function init(graph, options) {\n    // unfortunately we need to revalidate here, since POSITIVE_INFINITY could\n    // be lost during threads transition\n    options = validateOptions(options);\n    asyncOptions = options.async;\n\n    layout = createLayout(graph, options);\n    graph.forEachNode(initPosition);\n\n    // let main thread know that we can process layout\n    self.postMessage({ kind: messageKind.initDone });\n  }\n\n  function initPosition(node) {\n    positions[node.id] = layout.getNodePosition(node.id);\n  }\n\n  function step() {\n    assertInitialized();\n\n    stepCalled = true;\n\n    if (!timeoutId) {\n      runLayoutCycleAsync();\n    }\n  }\n\n  function runLayoutCycleAsync() {\n    if (systemStable) {\n      timeoutId = 0;\n      return;\n    }\n\n    // we have to unblock this thread to receive messages from the main thread.\n    timeoutId = setTimeout(function() {\n      runLayoutCycle();\n\n      // We either wait until next `step` event from RAF, or run now if asked to\n      // not wait for `step`.\n      if (stepCalled || !asyncOptions.waitForStep) {\n        stepCalled = false;\n        runLayoutCycleAsync();\n      } else {\n        // wait for the next event from the main thread to continue;\n        timeoutId = 0;\n      }\n    }, 0);\n  }\n\n  function runLayoutCycle() {\n    var wasStable = systemStable;\n    for (var i = 0; i < asyncOptions.stepsPerCycle; ++i) {\n      systemStable = layout.step();\n      completedIterations += 1;\n    }\n\n    if (completedIterations >= asyncOptions.maxIterations) {\n      systemStable = true;\n    }\n\n    self.postMessage({\n      kind: messageKind.cycleComplete,\n      payload: {\n        positions: positions,\n        systemStable: systemStable,\n        bbox: layout.getGraphRect(),\n        iterations: completedIterations\n      }\n    });\n  }\n};\n","/**\n * This file defines all possible messages between main thread and\n * web worker. The key is human readable message type, and the value is a\n * numeric attribute for quick matching\n */\nmodule.exports = {\n  /**\n   * Sent from main thread to web worker to initialize force layout\n   *\n   * payload:\n   *  {string} graph - result of ngraph.tojson(graph) operation.\n   *  {string} options - stringified optinons received by ngraph.asyncforce().\n   */\n  init: 10,\n\n  /**\n   * Sent from web worker to main thread to confirm that worker has done\n   * initializatino and can process incoming layout requests\n   *\n   * payload: undefined.\n   */\n  initDone: 11,\n\n  /**\n   * Sent from main thread to web worker to notify that rendering loop is currently\n   * active and worker should perform layout (if required). Worker can decide\n   * to ignore this request if, for example, layout is already computed, or\n   * worker has performed more than options.async.maxIterations iterations.\n   *\n   * payload: undefined.\n   */\n  step: 12,\n\n  /**\n   * Sent from webworker to main thread to indicate that worker has finished\n   * one cycle of layout iterations. Each cycle can perform up to\n   * options.asnc.stepsPerCycle iterations of layout.\n   *\n   * payload:\n   *  {object} positions - keys are node ids, values are {x, y, z} coordinates\n   *  {boolean} systemStable - indicates that system is stable. NOTE: this will\n   *  be removed from future version.\n   */\n  cycleComplete: 13,\n\n  /**\n   * Sent from main thread to web worker to pin node\n   *\n   * payload:\n   *   {string} nodeId - identifier of the node that needs to be pinned\n   *   {boolean} isPinned status of the node\n   */\n  pinNode: 41,\n\n  /**\n   * Sent from main thread to web worker to set position of the node\n   *\n   * payload:\n   *  {string} nodeId - identifier of the node that needs position update.\n   *  {number} x - x coordinate\n   *  {number} y - y coordinate\n   *  {number+} z - z coordinate - only applicable for 3d layout\n   */\n  setNodePosition: 43\n};\n","/**\n * This file defines configuration options for the asyncforce module. Every\n * configuration is optional. You can find its description and default value below.\n */\nmodule.exports = validateOptions;\n\nfunction validateOptions(options) {\n  options = options || {};\n\n  /**\n   * Do we need to run 3D layout or 2D?\n   */\n  options.is3d = typeof options.is3d === 'boolean' ? options.is3d : false;\n\n  // These options are in separate object since they configure web worker behavior\n  // not layout.\n  var async = (options.async = options.async || {});\n\n  /**\n   * Web worker computes layout in cycles. After each cycle is done web worker\n   * notifies the main thread with updated positions. This options defines\n   * how many layout steps should web worker complete within one cycle.\n   */\n  async.stepsPerCycle = typeof async.stepsPerCycle === 'number' ? async.stepsPerCycle : 5;\n\n  /**\n   * By default layout will be computed as long as each iteration brings too\n   * much movement to the system. However if you'd like to compute only N iterations\n   * of layout, you can set this option to N. Once layout reaches N it will consider\n   * system stable and will not compute more iterations.\n   */\n  async.maxIterations = typeof async.maxIterations === 'number' ? async.maxIterations : Number.POSITIVE_INFINITY;\n\n  /**\n   * Unlike requestAnimationFrame() web workers are executed even when page is\n   * not active (e.g. user switched to a different browser tab). This can result\n   * in unnecessary CPU consumption and battery drain.\n   *\n   * By default asyncforce will calculate layout as long as you call\n   * `asncforce.step()`. Normally you will call this method from\n   * requestAnimationFrame() handler to manage CPU resources.\n   *\n   * However, if you prefer to keep computing layout in background set this\n   * options to true. Layout will be computed until system is considered stable\n   * (see `maxIterations` above).\n   */\n  async.waitForStep = typeof async.waitForStep === 'boolean' ? async.waitForStep : true;\n  return options;\n}\n","module.exports = function(subject) {\n  validateSubject(subject);\n\n  var eventsStorage = createEventsStorage(subject);\n  subject.on = eventsStorage.on;\n  subject.off = eventsStorage.off;\n  subject.fire = eventsStorage.fire;\n  return subject;\n};\n\nfunction createEventsStorage(subject) {\n  // Store all event listeners to this hash. Key is event name, value is array\n  // of callback records.\n  //\n  // A callback record consists of callback function and its optional context:\n  // { 'eventName' => [{callback: function, ctx: object}] }\n  var registeredEvents = Object.create(null);\n\n  return {\n    on: function (eventName, callback, ctx) {\n      if (typeof callback !== 'function') {\n        throw new Error('callback is expected to be a function');\n      }\n      var handlers = registeredEvents[eventName];\n      if (!handlers) {\n        handlers = registeredEvents[eventName] = [];\n      }\n      handlers.push({callback: callback, ctx: ctx});\n\n      return subject;\n    },\n\n    off: function (eventName, callback) {\n      var wantToRemoveAll = (typeof eventName === 'undefined');\n      if (wantToRemoveAll) {\n        // Killing old events storage should be enough in this case:\n        registeredEvents = Object.create(null);\n        return subject;\n      }\n\n      if (registeredEvents[eventName]) {\n        var deleteAllCallbacksForEvent = (typeof callback !== 'function');\n        if (deleteAllCallbacksForEvent) {\n          delete registeredEvents[eventName];\n        } else {\n          var callbacks = registeredEvents[eventName];\n          for (var i = 0; i < callbacks.length; ++i) {\n            if (callbacks[i].callback === callback) {\n              callbacks.splice(i, 1);\n            }\n          }\n        }\n      }\n\n      return subject;\n    },\n\n    fire: function (eventName) {\n      var callbacks = registeredEvents[eventName];\n      if (!callbacks) {\n        return subject;\n      }\n\n      var fireArguments;\n      if (arguments.length > 1) {\n        fireArguments = Array.prototype.splice.call(arguments, 1);\n      }\n      for(var i = 0; i < callbacks.length; ++i) {\n        var callbackInfo = callbacks[i];\n        callbackInfo.callback.apply(callbackInfo.ctx, fireArguments);\n      }\n\n      return subject;\n    }\n  };\n}\n\nfunction validateSubject(subject) {\n  if (!subject) {\n    throw new Error('Eventify cannot use falsy object as events subject');\n  }\n  var reservedWords = ['on', 'fire', 'off'];\n  for (var i = 0; i < reservedWords.length; ++i) {\n    if (subject.hasOwnProperty(reservedWords[i])) {\n      throw new Error(\"Subject cannot be eventified, since it already has property '\" + reservedWords[i] + \"'\");\n    }\n  }\n}\n","module.exports = exposeProperties;\n\n/**\n * Augments `target` object with getter/setter functions, which modify settings\n *\n * @example\n *  var target = {};\n *  exposeProperties({ age: 42}, target);\n *  target.age(); // returns 42\n *  target.age(24); // make age 24;\n *\n *  var filteredTarget = {};\n *  exposeProperties({ age: 42, name: 'John'}, filteredTarget, ['name']);\n *  filteredTarget.name(); // returns 'John'\n *  filteredTarget.age === undefined; // true\n */\nfunction exposeProperties(settings, target, filter) {\n  var needsFilter = Object.prototype.toString.call(filter) === '[object Array]';\n  if (needsFilter) {\n    for (var i = 0; i < filter.length; ++i) {\n      augment(settings, target, filter[i]);\n    }\n  } else {\n    for (var key in settings) {\n      augment(settings, target, key);\n    }\n  }\n}\n\nfunction augment(source, target, key) {\n  if (source.hasOwnProperty(key)) {\n    if (typeof target[key] === 'function') {\n      // this accessor is already defined. Ignore it\n      return;\n    }\n    target[key] = function (value) {\n      if (value !== undefined) {\n        source[key] = value;\n        return target;\n      }\n      return source[key];\n    }\n  }\n}\n","/**\n * This module provides all required forces to regular ngraph.physics.simulator\n * to make it 3D simulator. Ideally ngraph.physics.simulator should operate\n * with vectors, but on practices that showed performance decrease... Maybe\n * I was doing it wrong, will see if I can refactor/throw away this module.\n */\nmodule.exports = createLayout;\ncreateLayout.get2dLayout = require('ngraph.forcelayout');\n\nfunction createLayout(graph, physicsSettings) {\n  var merge = require('ngraph.merge');\n  physicsSettings = merge(physicsSettings, {\n        createQuadTree: require('ngraph.quadtreebh3d'),\n        createBounds: require('./lib/bounds'),\n        createDragForce: require('./lib/dragForce'),\n        createSpringForce: require('./lib/springForce'),\n        integrator: require('./lib/eulerIntegrator'),\n        createBody: require('./lib/createBody')\n      });\n\n  return createLayout.get2dLayout(graph, physicsSettings);\n}\n","module.exports = function (bodies, settings) {\n  var random = require('ngraph.random').random(42);\n  var boundingBox =  { x1: 0, y1: 0, z1: 0, x2: 0, y2: 0, z2: 0 };\n\n  return {\n    box: boundingBox,\n\n    update: updateBoundingBox,\n\n    reset : function () {\n      boundingBox.x1 = boundingBox.y1 = 0;\n      boundingBox.x2 = boundingBox.y2 = 0;\n      boundingBox.z1 = boundingBox.z2 = 0;\n    },\n\n    getBestNewPosition: function (neighbors) {\n      var graphRect = boundingBox;\n\n      var baseX = 0, baseY = 0, baseZ = 0;\n\n      if (neighbors.length) {\n        for (var i = 0; i < neighbors.length; ++i) {\n          baseX += neighbors[i].pos.x;\n          baseY += neighbors[i].pos.y;\n          baseZ += neighbors[i].pos.z;\n        }\n\n        baseX /= neighbors.length;\n        baseY /= neighbors.length;\n        baseZ /= neighbors.length;\n      } else {\n        baseX = (graphRect.x1 + graphRect.x2) / 2;\n        baseY = (graphRect.y1 + graphRect.y2) / 2;\n        baseZ = (graphRect.z1 + graphRect.z2) / 2;\n      }\n\n      var springLength = settings.springLength;\n      return {\n        x: baseX + random.next(springLength) - springLength / 2,\n        y: baseY + random.next(springLength) - springLength / 2,\n        z: baseZ + random.next(springLength) - springLength / 2\n      };\n    }\n  };\n\n  function updateBoundingBox() {\n    var i = bodies.length;\n    if (i === 0) { return; } // don't have to wory here.\n\n    var x1 = Number.MAX_VALUE,\n        y1 = Number.MAX_VALUE,\n        z1 = Number.MAX_VALUE,\n        x2 = Number.MIN_VALUE,\n        y2 = Number.MIN_VALUE,\n        z2 = Number.MIN_VALUE;\n\n    while(i--) {\n      // this is O(n), could it be done faster with quadtree?\n      // how about pinned nodes?\n      var body = bodies[i];\n      if (body.isPinned) {\n        body.pos.x = body.prevPos.x;\n        body.pos.y = body.prevPos.y;\n        body.pos.z = body.prevPos.z;\n      } else {\n        body.prevPos.x = body.pos.x;\n        body.prevPos.y = body.pos.y;\n        body.prevPos.z = body.pos.z;\n      }\n      if (body.pos.x < x1) {\n        x1 = body.pos.x;\n      }\n      if (body.pos.x > x2) {\n        x2 = body.pos.x;\n      }\n      if (body.pos.y < y1) {\n        y1 = body.pos.y;\n      }\n      if (body.pos.y > y2) {\n        y2 = body.pos.y;\n      }\n      if (body.pos.z < z1) {\n        z1 = body.pos.z;\n      }\n      if (body.pos.z > z2) {\n        z2 = body.pos.z;\n      }\n    }\n\n    boundingBox.x1 = x1;\n    boundingBox.x2 = x2;\n    boundingBox.y1 = y1;\n    boundingBox.y2 = y2;\n    boundingBox.z1 = z1;\n    boundingBox.z2 = z2;\n  }\n};\n","var physics = require('ngraph.physics.primitives');\n\nmodule.exports = function(pos) {\n  return new physics.Body3d(pos);\n}\n","/**\n * Represents 3d drag force, which reduces force value on each step by given\n * coefficient.\n *\n * @param {Object} options for the drag force\n * @param {Number=} options.dragCoeff drag force coefficient. 0.1 by default\n */\nmodule.exports = function (options) {\n  var merge = require('ngraph.merge'),\n      expose = require('ngraph.expose');\n\n  options = merge(options, {\n    dragCoeff: 0.02\n  });\n\n  var api = {\n    update : function (body) {\n      body.force.x -= options.dragCoeff * body.velocity.x;\n      body.force.y -= options.dragCoeff * body.velocity.y;\n      body.force.z -= options.dragCoeff * body.velocity.z;\n    }\n  };\n\n  // let easy access to dragCoeff:\n  expose(options, api, ['dragCoeff']);\n\n  return api;\n};\n","/**\n * Performs 3d forces integration, using given timestep. Uses Euler method to solve\n * differential equation (http://en.wikipedia.org/wiki/Euler_method ).\n *\n * @returns {Number} squared distance of total position updates.\n */\n\nmodule.exports = integrate;\n\nfunction integrate(bodies, timeStep) {\n  var dx = 0, tx = 0,\n      dy = 0, ty = 0,\n      dz = 0, tz = 0,\n      i,\n      max = bodies.length;\n\n  for (i = 0; i < max; ++i) {\n    var body = bodies[i],\n        coeff = timeStep / body.mass;\n\n    body.velocity.x += coeff * body.force.x;\n    body.velocity.y += coeff * body.force.y;\n    body.velocity.z += coeff * body.force.z;\n\n    var vx = body.velocity.x,\n        vy = body.velocity.y,\n        vz = body.velocity.z,\n        v = Math.sqrt(vx * vx + vy * vy + vz * vz);\n\n    if (v > 1) {\n      body.velocity.x = vx / v;\n      body.velocity.y = vy / v;\n      body.velocity.z = vz / v;\n    }\n\n    dx = timeStep * body.velocity.x;\n    dy = timeStep * body.velocity.y;\n    dz = timeStep * body.velocity.z;\n\n    body.pos.x += dx;\n    body.pos.y += dy;\n    body.pos.z += dz;\n\n    tx += Math.abs(dx); ty += Math.abs(dy); tz += Math.abs(dz);\n  }\n\n  return (tx * tx + ty * ty + tz * tz)/bodies.length;\n}\n","/**\n * Represents 3d spring force, which updates forces acting on two bodies, conntected\n * by a spring.\n *\n * @param {Object} options for the spring force\n * @param {Number=} options.springCoeff spring force coefficient.\n * @param {Number=} options.springLength desired length of a spring at rest.\n */\nmodule.exports = function (options) {\n  var merge = require('ngraph.merge');\n  var random = require('ngraph.random').random(42);\n  var expose = require('ngraph.expose');\n\n  options = merge(options, {\n    springCoeff: 0.0002,\n    springLength: 80\n  });\n\n  var api = {\n    /**\n     * Upsates forces acting on a spring\n     */\n    update : function (spring) {\n      var body1 = spring.from,\n          body2 = spring.to,\n          length = spring.length < 0 ? options.springLength : spring.length,\n          dx = body2.pos.x - body1.pos.x,\n          dy = body2.pos.y - body1.pos.y,\n          dz = body2.pos.z - body1.pos.z,\n          r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n\n      if (r === 0) {\n          dx = (random.nextDouble() - 0.5) / 50;\n          dy = (random.nextDouble() - 0.5) / 50;\n          dz = (random.nextDouble() - 0.5) / 50;\n          r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n      }\n\n      var d = r - length;\n      var coeff = ((!spring.coeff || spring.coeff < 0) ? options.springCoeff : spring.coeff) * d / r * spring.weight;\n\n      body1.force.x += coeff * dx;\n      body1.force.y += coeff * dy;\n      body1.force.z += coeff * dz;\n\n      body2.force.x -= coeff * dx;\n      body2.force.y -= coeff * dy;\n      body2.force.z -= coeff * dz;\n    }\n  };\n\n  expose(options, api, ['springCoeff', 'springLength']);\n  return api;\n}\n","module.exports = createLayout;\nmodule.exports.simulator = require('ngraph.physics.simulator');\n\n/**\n * Creates force based layout for a given graph.\n * @param {ngraph.graph} graph which needs to be laid out\n * @param {object} physicsSettings if you need custom settings\n * for physics simulator you can pass your own settings here. If it's not passed\n * a default one will be created.\n */\nfunction createLayout(graph, physicsSettings) {\n  if (!graph) {\n    throw new Error('Graph structure cannot be undefined');\n  }\n\n  var createSimulator = require('ngraph.physics.simulator');\n  var physicsSimulator = createSimulator(physicsSettings);\n\n  var nodeBodies = typeof Object.create === 'function' ? Object.create(null) : {};\n  var springs = {};\n\n  var springTransform = physicsSimulator.settings.springTransform || noop;\n\n  // Initialize physical objects according to what we have in the graph:\n  initPhysics();\n  listenToGraphEvents();\n\n  var api = {\n    /**\n     * Performs one step of iterative layout algorithm\n     */\n    step: function() {\n      return physicsSimulator.step();\n    },\n\n    /**\n     * For a given `nodeId` returns position\n     */\n    getNodePosition: function (nodeId) {\n      return getInitializedBody(nodeId).pos;\n    },\n\n    /**\n     * Sets position of a node to a given coordinates\n     * @param {string} nodeId node identifier\n     * @param {number} x position of a node\n     * @param {number} y position of a node\n     * @param {number=} z position of node (only if applicable to body)\n     */\n    setNodePosition: function (nodeId) {\n      var body = getInitializedBody(nodeId);\n      body.setPosition.apply(body, Array.prototype.slice.call(arguments, 1));\n    },\n\n    /**\n     * @returns {Object} Link position by link id\n     * @returns {Object.from} {x, y} coordinates of link start\n     * @returns {Object.to} {x, y} coordinates of link end\n     */\n    getLinkPosition: function (linkId) {\n      var spring = springs[linkId];\n      if (spring) {\n        return {\n          from: spring.from.pos,\n          to: spring.to.pos\n        };\n      }\n    },\n\n    /**\n     * @returns {Object} area required to fit in the graph. Object contains\n     * `x1`, `y1` - top left coordinates\n     * `x2`, `y2` - bottom right coordinates\n     */\n    getGraphRect: function () {\n      return physicsSimulator.getBBox();\n    },\n\n    /*\n     * Requests layout algorithm to pin/unpin node to its current position\n     * Pinned nodes should not be affected by layout algorithm and always\n     * remain at their position\n     */\n    pinNode: function (node, isPinned) {\n      var body = getInitializedBody(node.id);\n       body.isPinned = !!isPinned;\n    },\n\n    /**\n     * Checks whether given graph's node is currently pinned\n     */\n    isNodePinned: function (node) {\n      return getInitializedBody(node.id).isPinned;\n    },\n\n    /**\n     * Request to release all resources\n     */\n    dispose: function() {\n      graph.off('changed', onGraphChanged);\n    },\n\n    /**\n     * Gets physical body for a given node id. If node is not found undefined\n     * value is returned.\n     */\n    getBody: getBody,\n\n    /**\n     * Gets spring for a given edge.\n     *\n     * @param {string} linkId link identifer. If two arguments are passed then\n     * this argument is treated as formNodeId\n     * @param {string=} toId when defined this parameter denotes head of the link\n     * and first argument is trated as tail of the link (fromId)\n     */\n    getSpring: getSpring,\n\n    /**\n     * [Read only] Gets current physics simulator\n     */\n    simulator: physicsSimulator\n  };\n\n  return api;\n\n  function getSpring(fromId, toId) {\n    var linkId;\n    if (toId === undefined) {\n      if (typeof fromId === 'string') {\n        // assume fromId as a linkId:\n        linkId = fromId;\n      } else {\n        // assume fromId to be a link object:\n        linkId = fromId.id;\n      }\n    } else {\n      // toId is defined, should grab link:\n      var link = graph.hasLink(fromId, toId);\n      if (!link) return;\n      linkId = link.id;\n    }\n\n    return springs[linkId];\n  }\n\n  function getBody(nodeId) {\n    return nodeBodies[nodeId];\n  }\n\n  function listenToGraphEvents() {\n    graph.on('changed', onGraphChanged);\n  }\n\n  function onGraphChanged(changes) {\n    for (var i = 0; i < changes.length; ++i) {\n      var change = changes[i];\n      if (change.changeType === 'add') {\n        if (change.node) {\n          initBody(change.node.id);\n        }\n        if (change.link) {\n          initLink(change.link);\n        }\n      } else if (change.changeType === 'remove') {\n        if (change.node) {\n          releaseNode(change.node);\n        }\n        if (change.link) {\n          releaseLink(change.link);\n        }\n      }\n    }\n  }\n\n  function initPhysics() {\n    graph.forEachNode(function (node) {\n      initBody(node.id);\n    });\n    graph.forEachLink(initLink);\n  }\n\n  function initBody(nodeId) {\n    var body = nodeBodies[nodeId];\n    if (!body) {\n      var node = graph.getNode(nodeId);\n      if (!node) {\n        throw new Error('initBody() was called with unknown node id');\n      }\n\n      var pos = node.position;\n      if (!pos) {\n        var neighbors = getNeighborBodies(node);\n        pos = physicsSimulator.getBestNewBodyPosition(neighbors);\n      }\n\n      body = physicsSimulator.addBodyAt(pos);\n\n      nodeBodies[nodeId] = body;\n      updateBodyMass(nodeId);\n\n      if (isNodeOriginallyPinned(node)) {\n        body.isPinned = true;\n      }\n    }\n  }\n\n  function releaseNode(node) {\n    var nodeId = node.id;\n    var body = nodeBodies[nodeId];\n    if (body) {\n      nodeBodies[nodeId] = null;\n      delete nodeBodies[nodeId];\n\n      physicsSimulator.removeBody(body);\n    }\n  }\n\n  function initLink(link) {\n    updateBodyMass(link.fromId);\n    updateBodyMass(link.toId);\n\n    var fromBody = nodeBodies[link.fromId],\n        toBody  = nodeBodies[link.toId],\n        spring = physicsSimulator.addSpring(fromBody, toBody, link.length);\n\n    springTransform(link, spring);\n\n    springs[link.id] = spring;\n  }\n\n  function releaseLink(link) {\n    var spring = springs[link.id];\n    if (spring) {\n      var from = graph.getNode(link.fromId),\n          to = graph.getNode(link.toId);\n\n      if (from) updateBodyMass(from.id);\n      if (to) updateBodyMass(to.id);\n\n      delete springs[link.id];\n\n      physicsSimulator.removeSpring(spring);\n    }\n  }\n\n  function getNeighborBodies(node) {\n    // TODO: Could probably be done better on memory\n    var neighbors = [];\n    if (!node.links) {\n      return neighbors;\n    }\n    var maxNeighbors = Math.min(node.links.length, 2);\n    for (var i = 0; i < maxNeighbors; ++i) {\n      var link = node.links[i];\n      var otherBody = link.fromId !== node.id ? nodeBodies[link.fromId] : nodeBodies[link.toId];\n      if (otherBody && otherBody.pos) {\n        neighbors.push(otherBody);\n      }\n    }\n\n    return neighbors;\n  }\n\n  function updateBodyMass(nodeId) {\n    var body = nodeBodies[nodeId];\n    body.mass = nodeMass(nodeId);\n  }\n\n  /**\n   * Checks whether graph node has in its settings pinned attribute,\n   * which means layout algorithm cannot move it. Node can be preconfigured\n   * as pinned, if it has \"isPinned\" attribute, or when node.data has it.\n   *\n   * @param {Object} node a graph node to check\n   * @return {Boolean} true if node should be treated as pinned; false otherwise.\n   */\n  function isNodeOriginallyPinned(node) {\n    return (node && (node.isPinned || (node.data && node.data.isPinned)));\n  }\n\n  function getInitializedBody(nodeId) {\n    var body = nodeBodies[nodeId];\n    if (!body) {\n      initBody(nodeId);\n      body = nodeBodies[nodeId];\n    }\n    return body;\n  }\n\n  /**\n   * Calculates mass of a body, which corresponds to node with given id.\n   *\n   * @param {String|Number} nodeId identifier of a node, for which body mass needs to be calculated\n   * @returns {Number} recommended mass of the body;\n   */\n  function nodeMass(nodeId) {\n    return 1 + graph.getLinks(nodeId).length / 3.0;\n  }\n}\n\nfunction noop() { }\n","/**\n * Manages a simulation of physical forces acting on bodies and springs.\n */\nmodule.exports = physicsSimulator;\n\nfunction physicsSimulator(settings) {\n  var Spring = require('./lib/spring');\n  var expose = require('ngraph.expose');\n  var merge = require('ngraph.merge');\n\n  settings = merge(settings, {\n      /**\n       * Ideal length for links (springs in physical model).\n       */\n      springLength: 30,\n\n      /**\n       * Hook's law coefficient. 1 - solid spring.\n       */\n      springCoeff: 0.0008,\n\n      /**\n       * Coulomb's law coefficient. It's used to repel nodes thus should be negative\n       * if you make it positive nodes start attract each other :).\n       */\n      gravity: -1.2,\n\n      /**\n       * Theta coefficient from Barnes Hut simulation. Ranged between (0, 1).\n       * The closer it's to 1 the more nodes algorithm will have to go through.\n       * Setting it to one makes Barnes Hut simulation no different from\n       * brute-force forces calculation (each node is considered).\n       */\n      theta: 0.8,\n\n      /**\n       * Drag force coefficient. Used to slow down system, thus should be less than 1.\n       * The closer it is to 0 the less tight system will be.\n       */\n      dragCoeff: 0.02,\n\n      /**\n       * Default time step (dt) for forces integration\n       */\n      timeStep : 20,\n\n      /**\n        * Maximum movement of the system which can be considered as stabilized\n        */\n      stableThreshold: 0.009\n  });\n\n  // We allow clients to override basic factory methods:\n  var createQuadTree = settings.createQuadTree || require('ngraph.quadtreebh');\n  var createBounds = settings.createBounds || require('./lib/bounds');\n  var createDragForce = settings.createDragForce || require('./lib/dragForce');\n  var createSpringForce = settings.createSpringForce || require('./lib/springForce');\n  var integrate = settings.integrator || require('./lib/eulerIntegrator');\n  var createBody = settings.createBody || require('./lib/createBody');\n\n  var bodies = [], // Bodies in this simulation.\n      springs = [], // Springs in this simulation.\n      quadTree =  createQuadTree(settings),\n      bounds = createBounds(bodies, settings),\n      springForce = createSpringForce(settings),\n      dragForce = createDragForce(settings);\n\n  var publicApi = {\n    /**\n     * Array of bodies, registered with current simulator\n     *\n     * Note: To add new body, use addBody() method. This property is only\n     * exposed for testing/performance purposes.\n     */\n    bodies: bodies,\n\n    /**\n     * Array of springs, registered with current simulator\n     *\n     * Note: To add new spring, use addSpring() method. This property is only\n     * exposed for testing/performance purposes.\n     */\n    springs: springs,\n\n    /**\n     * Returns settings with which current simulator was initialized\n     */\n    settings: settings,\n\n    /**\n     * Performs one step of force simulation.\n     *\n     * @returns {boolean} true if system is considered stable; False otherwise.\n     */\n    step: function () {\n      accumulateForces();\n      var totalMovement = integrate(bodies, settings.timeStep);\n\n      bounds.update();\n\n      return totalMovement < settings.stableThreshold;\n    },\n\n    /**\n     * Adds body to the system\n     *\n     * @param {ngraph.physics.primitives.Body} body physical body\n     *\n     * @returns {ngraph.physics.primitives.Body} added body\n     */\n    addBody: function (body) {\n      if (!body) {\n        throw new Error('Body is required');\n      }\n      bodies.push(body);\n\n      return body;\n    },\n\n    /**\n     * Adds body to the system at given position\n     *\n     * @param {Object} pos position of a body\n     *\n     * @returns {ngraph.physics.primitives.Body} added body\n     */\n    addBodyAt: function (pos) {\n      if (!pos) {\n        throw new Error('Body position is required');\n      }\n      var body = createBody(pos);\n      bodies.push(body);\n\n      return body;\n    },\n\n    /**\n     * Removes body from the system\n     *\n     * @param {ngraph.physics.primitives.Body} body to remove\n     *\n     * @returns {Boolean} true if body found and removed. falsy otherwise;\n     */\n    removeBody: function (body) {\n      if (!body) { return; }\n\n      var idx = bodies.indexOf(body);\n      if (idx < 0) { return; }\n\n      bodies.splice(idx, 1);\n      if (bodies.length === 0) {\n        bounds.reset();\n      }\n      return true;\n    },\n\n    /**\n     * Adds a spring to this simulation.\n     *\n     * @returns {Object} - a handle for a spring. If you want to later remove\n     * spring pass it to removeSpring() method.\n     */\n    addSpring: function (body1, body2, springLength, springWeight, springCoefficient) {\n      if (!body1 || !body2) {\n        throw new Error('Cannot add null spring to force simulator');\n      }\n\n      if (typeof springLength !== 'number') {\n        springLength = -1; // assume global configuration\n      }\n\n      var spring = new Spring(body1, body2, springLength, springCoefficient >= 0 ? springCoefficient : -1, springWeight);\n      springs.push(spring);\n\n      // TODO: could mark simulator as dirty.\n      return spring;\n    },\n\n    /**\n     * Removes spring from the system\n     *\n     * @param {Object} spring to remove. Spring is an object returned by addSpring\n     *\n     * @returns {Boolean} true if spring found and removed. falsy otherwise;\n     */\n    removeSpring: function (spring) {\n      if (!spring) { return; }\n      var idx = springs.indexOf(spring);\n      if (idx > -1) {\n        springs.splice(idx, 1);\n        return true;\n      }\n    },\n\n    getBestNewBodyPosition: function (neighbors) {\n      return bounds.getBestNewPosition(neighbors);\n    },\n\n    /**\n     * Returns bounding box which covers all bodies\n     */\n    getBBox: function () {\n      return bounds.box;\n    },\n\n    gravity: function (value) {\n      if (value !== undefined) {\n        settings.gravity = value;\n        quadTree.options({gravity: value});\n        return this;\n      } else {\n        return settings.gravity;\n      }\n    },\n\n    theta: function (value) {\n      if (value !== undefined) {\n        settings.theta = value;\n        quadTree.options({theta: value});\n        return this;\n      } else {\n        return settings.theta;\n      }\n    }\n  };\n\n  // allow settings modification via public API:\n  expose(settings, publicApi);\n\n  return publicApi;\n\n  function accumulateForces() {\n    // Accumulate forces acting on bodies.\n    var body,\n        i = bodies.length;\n\n    if (i) {\n      // only add bodies if there the array is not empty:\n      quadTree.insertBodies(bodies); // performance: O(n * log n)\n      while (i--) {\n        body = bodies[i];\n        // If body is pinned there is no point updating its forces - it should\n        // never move:\n        if (!body.isPinned) {\n          body.force.reset();\n\n          quadTree.updateBodyForce(body);\n          dragForce.update(body);\n        }\n      }\n    }\n\n    i = springs.length;\n    while(i--) {\n      springForce.update(springs[i]);\n    }\n  }\n};\n","module.exports = function (bodies, settings) {\n  var random = require('ngraph.random').random(42);\n  var boundingBox =  { x1: 0, y1: 0, x2: 0, y2: 0 };\n\n  return {\n    box: boundingBox,\n\n    update: updateBoundingBox,\n\n    reset : function () {\n      boundingBox.x1 = boundingBox.y1 = 0;\n      boundingBox.x2 = boundingBox.y2 = 0;\n    },\n\n    getBestNewPosition: function (neighbors) {\n      var graphRect = boundingBox;\n\n      var baseX = 0, baseY = 0;\n\n      if (neighbors.length) {\n        for (var i = 0; i < neighbors.length; ++i) {\n          baseX += neighbors[i].pos.x;\n          baseY += neighbors[i].pos.y;\n        }\n\n        baseX /= neighbors.length;\n        baseY /= neighbors.length;\n      } else {\n        baseX = (graphRect.x1 + graphRect.x2) / 2;\n        baseY = (graphRect.y1 + graphRect.y2) / 2;\n      }\n\n      var springLength = settings.springLength;\n      return {\n        x: baseX + random.next(springLength) - springLength / 2,\n        y: baseY + random.next(springLength) - springLength / 2\n      };\n    }\n  };\n\n  function updateBoundingBox() {\n    var i = bodies.length;\n    if (i === 0) { return; } // don't have to wory here.\n\n    var x1 = Number.MAX_VALUE,\n        y1 = Number.MAX_VALUE,\n        x2 = Number.MIN_VALUE,\n        y2 = Number.MIN_VALUE;\n\n    while(i--) {\n      // this is O(n), could it be done faster with quadtree?\n      // how about pinned nodes?\n      var body = bodies[i];\n      if (body.isPinned) {\n        body.pos.x = body.prevPos.x;\n        body.pos.y = body.prevPos.y;\n      } else {\n        body.prevPos.x = body.pos.x;\n        body.prevPos.y = body.pos.y;\n      }\n      if (body.pos.x < x1) {\n        x1 = body.pos.x;\n      }\n      if (body.pos.x > x2) {\n        x2 = body.pos.x;\n      }\n      if (body.pos.y < y1) {\n        y1 = body.pos.y;\n      }\n      if (body.pos.y > y2) {\n        y2 = body.pos.y;\n      }\n    }\n\n    boundingBox.x1 = x1;\n    boundingBox.x2 = x2;\n    boundingBox.y1 = y1;\n    boundingBox.y2 = y2;\n  }\n}\n","var physics = require('ngraph.physics.primitives');\n\nmodule.exports = function(pos) {\n  return new physics.Body(pos);\n}\n","/**\n * Represents drag force, which reduces force value on each step by given\n * coefficient.\n *\n * @param {Object} options for the drag force\n * @param {Number=} options.dragCoeff drag force coefficient. 0.1 by default\n */\nmodule.exports = function (options) {\n  var merge = require('ngraph.merge'),\n      expose = require('ngraph.expose');\n\n  options = merge(options, {\n    dragCoeff: 0.02\n  });\n\n  var api = {\n    update : function (body) {\n      body.force.x -= options.dragCoeff * body.velocity.x;\n      body.force.y -= options.dragCoeff * body.velocity.y;\n    }\n  };\n\n  // let easy access to dragCoeff:\n  expose(options, api, ['dragCoeff']);\n\n  return api;\n};\n","/**\n * Performs forces integration, using given timestep. Uses Euler method to solve\n * differential equation (http://en.wikipedia.org/wiki/Euler_method ).\n *\n * @returns {Number} squared distance of total position updates.\n */\n\nmodule.exports = integrate;\n\nfunction integrate(bodies, timeStep) {\n  var dx = 0, tx = 0,\n      dy = 0, ty = 0,\n      i,\n      max = bodies.length;\n\n  for (i = 0; i < max; ++i) {\n    var body = bodies[i],\n        coeff = timeStep / body.mass;\n\n    body.velocity.x += coeff * body.force.x;\n    body.velocity.y += coeff * body.force.y;\n    var vx = body.velocity.x,\n        vy = body.velocity.y,\n        v = Math.sqrt(vx * vx + vy * vy);\n\n    if (v > 1) {\n      body.velocity.x = vx / v;\n      body.velocity.y = vy / v;\n    }\n\n    dx = timeStep * body.velocity.x;\n    dy = timeStep * body.velocity.y;\n\n    body.pos.x += dx;\n    body.pos.y += dy;\n\n    tx += Math.abs(dx); ty += Math.abs(dy);\n  }\n\n  return (tx * tx + ty * ty)/bodies.length;\n}\n","module.exports = Spring;\n\n/**\n * Represents a physical spring. Spring connects two bodies, has rest length\n * stiffness coefficient and optional weight\n */\nfunction Spring(fromBody, toBody, length, coeff, weight) {\n    this.from = fromBody;\n    this.to = toBody;\n    this.length = length;\n    this.coeff = coeff;\n\n    this.weight = typeof weight === 'number' ? weight : 1;\n};\n","/**\n * Represents spring force, which updates forces acting on two bodies, conntected\n * by a spring.\n *\n * @param {Object} options for the spring force\n * @param {Number=} options.springCoeff spring force coefficient.\n * @param {Number=} options.springLength desired length of a spring at rest.\n */\nmodule.exports = function (options) {\n  var merge = require('ngraph.merge');\n  var random = require('ngraph.random').random(42);\n  var expose = require('ngraph.expose');\n\n  options = merge(options, {\n    springCoeff: 0.0002,\n    springLength: 80\n  });\n\n  var api = {\n    /**\n     * Upsates forces acting on a spring\n     */\n    update : function (spring) {\n      var body1 = spring.from,\n          body2 = spring.to,\n          length = spring.length < 0 ? options.springLength : spring.length,\n          dx = body2.pos.x - body1.pos.x,\n          dy = body2.pos.y - body1.pos.y,\n          r = Math.sqrt(dx * dx + dy * dy);\n\n      if (r === 0) {\n          dx = (random.nextDouble() - 0.5) / 50;\n          dy = (random.nextDouble() - 0.5) / 50;\n          r = Math.sqrt(dx * dx + dy * dy);\n      }\n\n      var d = r - length;\n      var coeff = ((!spring.coeff || spring.coeff < 0) ? options.springCoeff : spring.coeff) * d / r * spring.weight;\n\n      body1.force.x += coeff * dx;\n      body1.force.y += coeff * dy;\n\n      body2.force.x -= coeff * dx;\n      body2.force.y -= coeff * dy;\n    }\n  };\n\n  expose(options, api, ['springCoeff', 'springLength']);\n  return api;\n}\n","module.exports = load;\n\nvar createGraph = require('ngraph.graph');\n\nfunction load(jsonGraph, nodeTransform, linkTransform) {\n  var stored;\n  nodeTransform = nodeTransform || id;\n  linkTransform = linkTransform || id;\n  if (typeof jsonGraph === 'string') {\n    stored = JSON.parse(jsonGraph);\n  } else {\n    stored = jsonGraph;\n  }\n\n  var graph = createGraph(),\n      i;\n\n  if (stored.links === undefined || stored.nodes === undefined) {\n    throw new Error('Cannot load graph without links and nodes');\n  }\n\n  for (i = 0; i < stored.nodes.length; ++i) {\n    var parsedNode = nodeTransform(stored.nodes[i]);\n    if (!parsedNode.hasOwnProperty('id')) {\n      throw new Error('Graph node format is invalid: Node id is missing');\n    }\n\n    graph.addNode(parsedNode.id, parsedNode.data);\n  }\n\n  for (i = 0; i < stored.links.length; ++i) {\n    var link = linkTransform(stored.links[i]);\n    if (!link.hasOwnProperty('fromId') || !link.hasOwnProperty('toId')) {\n      throw new Error('Graph link format is invalid. Both fromId and toId are required');\n    }\n\n    graph.addLink(link.fromId, link.toId, link.data);\n  }\n\n  return graph;\n}\n\nfunction id(x) { return x; }\n","/**\n * @fileOverview Contains definition of the core graph object.\n */\n\n/**\n * @example\n *  var graph = require('ngraph.graph')();\n *  graph.addNode(1);     // graph has one node.\n *  graph.addLink(2, 3);  // now graph contains three nodes and one link.\n *\n */\nmodule.exports = createGraph;\n\nvar eventify = require('ngraph.events');\n\n/**\n * Creates a new graph\n */\nfunction createGraph(options) {\n  // Graph structure is maintained as dictionary of nodes\n  // and array of links. Each node has 'links' property which\n  // hold all links related to that node. And general links\n  // array is used to speed up all links enumeration. This is inefficient\n  // in terms of memory, but simplifies coding.\n  options = options || {};\n  if (options.uniqueLinkId === undefined) {\n    // Request each link id to be unique between same nodes. This negatively\n    // impacts `addLink()` performance (O(n), where n - number of edges of each\n    // vertex), but makes operations with multigraphs more accessible.\n    options.uniqueLinkId = true;\n  }\n\n  var nodes = typeof Object.create === 'function' ? Object.create(null) : {},\n    links = [],\n    // Hash of multi-edges. Used to track ids of edges between same nodes\n    multiEdges = {},\n    nodesCount = 0,\n    suspendEvents = 0,\n\n    forEachNode = createNodeIterator(),\n    createLink = options.uniqueLinkId ? createUniqueLink : createSingleLink,\n\n    // Our graph API provides means to listen to graph changes. Users can subscribe\n    // to be notified about changes in the graph by using `on` method. However\n    // in some cases they don't use it. To avoid unnecessary memory consumption\n    // we will not record graph changes until we have at least one subscriber.\n    // Code below supports this optimization.\n    //\n    // Accumulates all changes made during graph updates.\n    // Each change element contains:\n    //  changeType - one of the strings: 'add', 'remove' or 'update';\n    //  node - if change is related to node this property is set to changed graph's node;\n    //  link - if change is related to link this property is set to changed graph's link;\n    changes = [],\n    recordLinkChange = noop,\n    recordNodeChange = noop,\n    enterModification = noop,\n    exitModification = noop;\n\n  // this is our public API:\n  var graphPart = {\n    /**\n     * Adds node to the graph. If node with given id already exists in the graph\n     * its data is extended with whatever comes in 'data' argument.\n     *\n     * @param nodeId the node's identifier. A string or number is preferred.\n     * @param [data] additional data for the node being added. If node already\n     *   exists its data object is augmented with the new one.\n     *\n     * @return {node} The newly added node or node with given id if it already exists.\n     */\n    addNode: addNode,\n\n    /**\n     * Adds a link to the graph. The function always create a new\n     * link between two nodes. If one of the nodes does not exists\n     * a new node is created.\n     *\n     * @param fromId link start node id;\n     * @param toId link end node id;\n     * @param [data] additional data to be set on the new link;\n     *\n     * @return {link} The newly created link\n     */\n    addLink: addLink,\n\n    /**\n     * Removes link from the graph. If link does not exist does nothing.\n     *\n     * @param link - object returned by addLink() or getLinks() methods.\n     *\n     * @returns true if link was removed; false otherwise.\n     */\n    removeLink: removeLink,\n\n    /**\n     * Removes node with given id from the graph. If node does not exist in the graph\n     * does nothing.\n     *\n     * @param nodeId node's identifier passed to addNode() function.\n     *\n     * @returns true if node was removed; false otherwise.\n     */\n    removeNode: removeNode,\n\n    /**\n     * Gets node with given identifier. If node does not exist undefined value is returned.\n     *\n     * @param nodeId requested node identifier;\n     *\n     * @return {node} in with requested identifier or undefined if no such node exists.\n     */\n    getNode: getNode,\n\n    /**\n     * Gets number of nodes in this graph.\n     *\n     * @return number of nodes in the graph.\n     */\n    getNodesCount: function() {\n      return nodesCount;\n    },\n\n    /**\n     * Gets total number of links in the graph.\n     */\n    getLinksCount: function() {\n      return links.length;\n    },\n\n    /**\n     * Gets all links (inbound and outbound) from the node with given id.\n     * If node with given id is not found null is returned.\n     *\n     * @param nodeId requested node identifier.\n     *\n     * @return Array of links from and to requested node if such node exists;\n     *   otherwise null is returned.\n     */\n    getLinks: getLinks,\n\n    /**\n     * Invokes callback on each node of the graph.\n     *\n     * @param {Function(node)} callback Function to be invoked. The function\n     *   is passed one argument: visited node.\n     */\n    forEachNode: forEachNode,\n\n    /**\n     * Invokes callback on every linked (adjacent) node to the given one.\n     *\n     * @param nodeId Identifier of the requested node.\n     * @param {Function(node, link)} callback Function to be called on all linked nodes.\n     *   The function is passed two parameters: adjacent node and link object itself.\n     * @param oriented if true graph treated as oriented.\n     */\n    forEachLinkedNode: forEachLinkedNode,\n\n    /**\n     * Enumerates all links in the graph\n     *\n     * @param {Function(link)} callback Function to be called on all links in the graph.\n     *   The function is passed one parameter: graph's link object.\n     *\n     * Link object contains at least the following fields:\n     *  fromId - node id where link starts;\n     *  toId - node id where link ends,\n     *  data - additional data passed to graph.addLink() method.\n     */\n    forEachLink: forEachLink,\n\n    /**\n     * Suspend all notifications about graph changes until\n     * endUpdate is called.\n     */\n    beginUpdate: enterModification,\n\n    /**\n     * Resumes all notifications about graph changes and fires\n     * graph 'changed' event in case there are any pending changes.\n     */\n    endUpdate: exitModification,\n\n    /**\n     * Removes all nodes and links from the graph.\n     */\n    clear: clear,\n\n    /**\n     * Detects whether there is a link between two nodes.\n     * Operation complexity is O(n) where n - number of links of a node.\n     * NOTE: this function is synonim for getLink()\n     *\n     * @returns link if there is one. null otherwise.\n     */\n    hasLink: getLink,\n\n    /**\n     * Gets an edge between two nodes.\n     * Operation complexity is O(n) where n - number of links of a node.\n     *\n     * @param {string} fromId link start identifier\n     * @param {string} toId link end identifier\n     *\n     * @returns link if there is one. null otherwise.\n     */\n    getLink: getLink\n  };\n\n  // this will add `on()` and `fire()` methods.\n  eventify(graphPart);\n\n  monitorSubscribers();\n\n  return graphPart;\n\n  function monitorSubscribers() {\n    var realOn = graphPart.on;\n\n    // replace real `on` with our temporary on, which will trigger change\n    // modification monitoring:\n    graphPart.on = on;\n\n    function on() {\n      // now it's time to start tracking stuff:\n      graphPart.beginUpdate = enterModification = enterModificationReal;\n      graphPart.endUpdate = exitModification = exitModificationReal;\n      recordLinkChange = recordLinkChangeReal;\n      recordNodeChange = recordNodeChangeReal;\n\n      // this will replace current `on` method with real pub/sub from `eventify`.\n      graphPart.on = realOn;\n      // delegate to real `on` handler:\n      return realOn.apply(graphPart, arguments);\n    }\n  }\n\n  function recordLinkChangeReal(link, changeType) {\n    changes.push({\n      link: link,\n      changeType: changeType\n    });\n  }\n\n  function recordNodeChangeReal(node, changeType) {\n    changes.push({\n      node: node,\n      changeType: changeType\n    });\n  }\n\n  function addNode(nodeId, data) {\n    if (nodeId === undefined) {\n      throw new Error('Invalid node identifier');\n    }\n\n    enterModification();\n\n    var node = getNode(nodeId);\n    if (!node) {\n      node = new Node(nodeId);\n      nodesCount++;\n      recordNodeChange(node, 'add');\n    } else {\n      recordNodeChange(node, 'update');\n    }\n\n    node.data = data;\n\n    nodes[nodeId] = node;\n\n    exitModification();\n    return node;\n  }\n\n  function getNode(nodeId) {\n    return nodes[nodeId];\n  }\n\n  function removeNode(nodeId) {\n    var node = getNode(nodeId);\n    if (!node) {\n      return false;\n    }\n\n    enterModification();\n\n    if (node.links) {\n      while (node.links.length) {\n        var link = node.links[0];\n        removeLink(link);\n      }\n    }\n\n    delete nodes[nodeId];\n    nodesCount--;\n\n    recordNodeChange(node, 'remove');\n\n    exitModification();\n\n    return true;\n  }\n\n\n  function addLink(fromId, toId, data) {\n    enterModification();\n\n    var fromNode = getNode(fromId) || addNode(fromId);\n    var toNode = getNode(toId) || addNode(toId);\n\n    var link = createLink(fromId, toId, data);\n\n    links.push(link);\n\n    // TODO: this is not cool. On large graphs potentially would consume more memory.\n    addLinkToNode(fromNode, link);\n    if (fromId !== toId) {\n      // make sure we are not duplicating links for self-loops\n      addLinkToNode(toNode, link);\n    }\n\n    recordLinkChange(link, 'add');\n\n    exitModification();\n\n    return link;\n  }\n\n  function createSingleLink(fromId, toId, data) {\n    var linkId = makeLinkId(fromId, toId);\n    return new Link(fromId, toId, data, linkId);\n  }\n\n  function createUniqueLink(fromId, toId, data) {\n    // TODO: Get rid of this method.\n    var linkId = makeLinkId(fromId, toId);\n    var isMultiEdge = multiEdges.hasOwnProperty(linkId);\n    if (isMultiEdge || getLink(fromId, toId)) {\n      if (!isMultiEdge) {\n        multiEdges[linkId] = 0;\n      }\n      var suffix = '@' + (++multiEdges[linkId]);\n      linkId = makeLinkId(fromId + suffix, toId + suffix);\n    }\n\n    return new Link(fromId, toId, data, linkId);\n  }\n\n  function getLinks(nodeId) {\n    var node = getNode(nodeId);\n    return node ? node.links : null;\n  }\n\n  function removeLink(link) {\n    if (!link) {\n      return false;\n    }\n    var idx = indexOfElementInArray(link, links);\n    if (idx < 0) {\n      return false;\n    }\n\n    enterModification();\n\n    links.splice(idx, 1);\n\n    var fromNode = getNode(link.fromId);\n    var toNode = getNode(link.toId);\n\n    if (fromNode) {\n      idx = indexOfElementInArray(link, fromNode.links);\n      if (idx >= 0) {\n        fromNode.links.splice(idx, 1);\n      }\n    }\n\n    if (toNode) {\n      idx = indexOfElementInArray(link, toNode.links);\n      if (idx >= 0) {\n        toNode.links.splice(idx, 1);\n      }\n    }\n\n    recordLinkChange(link, 'remove');\n\n    exitModification();\n\n    return true;\n  }\n\n  function getLink(fromNodeId, toNodeId) {\n    // TODO: Use sorted links to speed this up\n    var node = getNode(fromNodeId),\n      i;\n    if (!node || !node.links) {\n      return null;\n    }\n\n    for (i = 0; i < node.links.length; ++i) {\n      var link = node.links[i];\n      if (link.fromId === fromNodeId && link.toId === toNodeId) {\n        return link;\n      }\n    }\n\n    return null; // no link.\n  }\n\n  function clear() {\n    enterModification();\n    forEachNode(function(node) {\n      removeNode(node.id);\n    });\n    exitModification();\n  }\n\n  function forEachLink(callback) {\n    var i, length;\n    if (typeof callback === 'function') {\n      for (i = 0, length = links.length; i < length; ++i) {\n        callback(links[i]);\n      }\n    }\n  }\n\n  function forEachLinkedNode(nodeId, callback, oriented) {\n    var node = getNode(nodeId);\n\n    if (node && node.links && typeof callback === 'function') {\n      if (oriented) {\n        return forEachOrientedLink(node.links, nodeId, callback);\n      } else {\n        return forEachNonOrientedLink(node.links, nodeId, callback);\n      }\n    }\n  }\n\n  function forEachNonOrientedLink(links, nodeId, callback) {\n    var quitFast;\n    for (var i = 0; i < links.length; ++i) {\n      var link = links[i];\n      var linkedNodeId = link.fromId === nodeId ? link.toId : link.fromId;\n\n      quitFast = callback(nodes[linkedNodeId], link);\n      if (quitFast) {\n        return true; // Client does not need more iterations. Break now.\n      }\n    }\n  }\n\n  function forEachOrientedLink(links, nodeId, callback) {\n    var quitFast;\n    for (var i = 0; i < links.length; ++i) {\n      var link = links[i];\n      if (link.fromId === nodeId) {\n        quitFast = callback(nodes[link.toId], link);\n        if (quitFast) {\n          return true; // Client does not need more iterations. Break now.\n        }\n      }\n    }\n  }\n\n  // we will not fire anything until users of this library explicitly call `on()`\n  // method.\n  function noop() {}\n\n  // Enter, Exit modification allows bulk graph updates without firing events.\n  function enterModificationReal() {\n    suspendEvents += 1;\n  }\n\n  function exitModificationReal() {\n    suspendEvents -= 1;\n    if (suspendEvents === 0 && changes.length > 0) {\n      graphPart.fire('changed', changes);\n      changes.length = 0;\n    }\n  }\n\n  function createNodeIterator() {\n    // Object.keys iterator is 1.3x faster than `for in` loop.\n    // See `https://github.com/anvaka/ngraph.graph/tree/bench-for-in-vs-obj-keys`\n    // branch for perf test\n    return Object.keys ? objectKeysIterator : forInIterator;\n  }\n\n  function objectKeysIterator(callback) {\n    if (typeof callback !== 'function') {\n      return;\n    }\n\n    var keys = Object.keys(nodes);\n    for (var i = 0; i < keys.length; ++i) {\n      if (callback(nodes[keys[i]])) {\n        return true; // client doesn't want to proceed. Return.\n      }\n    }\n  }\n\n  function forInIterator(callback) {\n    if (typeof callback !== 'function') {\n      return;\n    }\n    var node;\n\n    for (node in nodes) {\n      if (callback(nodes[node])) {\n        return true; // client doesn't want to proceed. Return.\n      }\n    }\n  }\n}\n\n// need this for old browsers. Should this be a separate module?\nfunction indexOfElementInArray(element, array) {\n  if (!array) return -1;\n\n  if (array.indexOf) {\n    return array.indexOf(element);\n  }\n\n  var len = array.length,\n    i;\n\n  for (i = 0; i < len; i += 1) {\n    if (array[i] === element) {\n      return i;\n    }\n  }\n\n  return -1;\n}\n\n/**\n * Internal structure to represent node;\n */\nfunction Node(id) {\n  this.id = id;\n  this.links = null;\n  this.data = null;\n}\n\nfunction addLinkToNode(node, link) {\n  if (node.links) {\n    node.links.push(link);\n  } else {\n    node.links = [link];\n  }\n}\n\n/**\n * Internal structure to represent links;\n */\nfunction Link(fromId, toId, data, id) {\n  this.fromId = fromId;\n  this.toId = toId;\n  this.data = data;\n  this.id = id;\n}\n\nfunction hashCode(str) {\n  var hash = 0, i, chr, len;\n  if (str.length == 0) return hash;\n  for (i = 0, len = str.length; i < len; i++) {\n    chr   = str.charCodeAt(i);\n    hash  = ((hash << 5) - hash) + chr;\n    hash |= 0; // Convert to 32bit integer\n  }\n  return hash;\n}\n\nfunction makeLinkId(fromId, toId) {\n  return hashCode(fromId.toString() + '👉 ' + toId.toString());\n}\n","module.exports = merge;\n\n/**\n * Augments `target` with properties in `options`. Does not override\n * target's properties if they are defined and matches expected type in \n * options\n *\n * @returns {Object} merged object\n */\nfunction merge(target, options) {\n  var key;\n  if (!target) { target = {}; }\n  if (options) {\n    for (key in options) {\n      if (options.hasOwnProperty(key)) {\n        var targetHasIt = target.hasOwnProperty(key),\n            optionsValueType = typeof options[key],\n            shouldReplace = !targetHasIt || (typeof target[key] !== optionsValueType);\n\n        if (shouldReplace) {\n          target[key] = options[key];\n        } else if (optionsValueType === 'object') {\n          // go deep, don't care about loops here, we are simple API!:\n          target[key] = merge(target[key], options[key]);\n        }\n      }\n    }\n  }\n\n  return target;\n}\n","module.exports = {\n  Body: Body,\n  Vector2d: Vector2d,\n  Body3d: Body3d,\n  Vector3d: Vector3d\n};\n\nfunction Body(x, y) {\n  this.pos = new Vector2d(x, y);\n  this.prevPos = new Vector2d(x, y);\n  this.force = new Vector2d();\n  this.velocity = new Vector2d();\n  this.mass = 1;\n}\n\nBody.prototype.setPosition = function (x, y) {\n  this.prevPos.x = this.pos.x = x;\n  this.prevPos.y = this.pos.y = y;\n};\n\nfunction Vector2d(x, y) {\n  if (x && typeof x !== 'number') {\n    // could be another vector\n    this.x = typeof x.x === 'number' ? x.x : 0;\n    this.y = typeof x.y === 'number' ? x.y : 0;\n  } else {\n    this.x = typeof x === 'number' ? x : 0;\n    this.y = typeof y === 'number' ? y : 0;\n  }\n}\n\nVector2d.prototype.reset = function () {\n  this.x = this.y = 0;\n};\n\nfunction Body3d(x, y, z) {\n  this.pos = new Vector3d(x, y, z);\n  this.prevPos = new Vector3d(x, y, z);\n  this.force = new Vector3d();\n  this.velocity = new Vector3d();\n  this.mass = 1;\n}\n\nBody3d.prototype.setPosition = function (x, y, z) {\n  this.prevPos.x = this.pos.x = x;\n  this.prevPos.y = this.pos.y = y;\n  this.prevPos.z = this.pos.z = z;\n};\n\nfunction Vector3d(x, y, z) {\n  if (x && typeof x !== 'number') {\n    // could be another vector\n    this.x = typeof x.x === 'number' ? x.x : 0;\n    this.y = typeof x.y === 'number' ? x.y : 0;\n    this.z = typeof x.z === 'number' ? x.z : 0;\n  } else {\n    this.x = typeof x === 'number' ? x : 0;\n    this.y = typeof y === 'number' ? y : 0;\n    this.z = typeof z === 'number' ? z : 0;\n  }\n};\n\nVector3d.prototype.reset = function () {\n  this.x = this.y = this.z = 0;\n};\n","/**\n * This is Barnes Hut simulation algorithm for 3d case. Implementation\n * is highly optimized (avoids recusion and gc pressure)\n *\n * http://www.cs.princeton.edu/courses/archive/fall03/cs126/assignments/barnes-hut.html\n *\n * NOTE: This module duplicates a lot of code from 2d case. Primary reason for\n * this is performance. Every time I tried to abstract away vector operations\n * I had negative impact on performance. So in this case I'm scarifying code\n * reuse in favor of speed\n */\n\nmodule.exports = function(options) {\n  options = options || {};\n  options.gravity = typeof options.gravity === 'number' ? options.gravity : -1;\n  options.theta = typeof options.theta === 'number' ? options.theta : 0.8;\n\n  // we require deterministic randomness here\n  var random = require('ngraph.random').random(1984),\n    Node = require('./node'),\n    InsertStack = require('./insertStack'),\n    isSamePosition = require('./isSamePosition');\n\n  var gravity = options.gravity,\n    updateQueue = [],\n    insertStack = new InsertStack(),\n    theta = options.theta,\n\n    nodesCache = [],\n    currentInCache = 0,\n    newNode = function() {\n      // To avoid pressure on GC we reuse nodes.\n      var node = nodesCache[currentInCache];\n      if (node) {\n        node.quad0 = null;\n        node.quad4 = null;\n        node.quad1 = null;\n        node.quad5 = null;\n        node.quad2 = null;\n        node.quad6 = null;\n        node.quad3 = null;\n        node.quad7 = null;\n        node.body = null;\n        node.mass = node.massX = node.massY = node.massZ = 0;\n        node.left = node.right = node.top = node.bottom = node.front = node.back = 0;\n      } else {\n        node = new Node();\n        nodesCache[currentInCache] = node;\n      }\n\n      ++currentInCache;\n      return node;\n    },\n\n    root = newNode(),\n\n    // Inserts body to the tree\n    insert = function(newBody) {\n      insertStack.reset();\n      insertStack.push(root, newBody);\n\n      while (!insertStack.isEmpty()) {\n        var stackItem = insertStack.pop(),\n          node = stackItem.node,\n          body = stackItem.body;\n\n        if (!node.body) {\n          // This is internal node. Update the total mass of the node and center-of-mass.\n          var x = body.pos.x;\n          var y = body.pos.y;\n          var z = body.pos.z;\n          node.mass += body.mass;\n          node.massX += body.mass * x;\n          node.massY += body.mass * y;\n          node.massZ += body.mass * z;\n\n          // Recursively insert the body in the appropriate quadrant.\n          // But first find the appropriate quadrant.\n          var quadIdx = 0, // Assume we are in the 0's quad.\n            left = node.left,\n            right = (node.right + left) / 2,\n            top = node.top,\n            bottom = (node.bottom + top) / 2,\n            back = node.back,\n            front = (node.front + back) / 2;\n\n          if (x > right) { // somewhere in the eastern part.\n            quadIdx += 1;\n            var oldLeft = left;\n            left = right;\n            right = right + (right - oldLeft);\n          }\n          if (y > bottom) { // and in south.\n            quadIdx += 2;\n            var oldTop = top;\n            top = bottom;\n            bottom = bottom + (bottom - oldTop);\n          }\n          if (z > front) { // and in frontal part\n            quadIdx += 4;\n            var oldBack = back;\n            back = front;\n            front = back + (back - oldBack);\n          }\n\n          var child = getChild(node, quadIdx);\n          if (!child) {\n            // The node is internal but this quadrant is not taken. Add subnode to it.\n            child = newNode();\n            child.left = left;\n            child.top = top;\n            child.right = right;\n            child.bottom = bottom;\n            child.back = back;\n            child.front = front;\n            child.body = body;\n\n            setChild(node, quadIdx, child);\n          } else {\n            // continue searching in this quadrant.\n            insertStack.push(child, body);\n          }\n        } else {\n          // We are trying to add to the leaf node.\n          // We have to convert current leaf into internal node\n          // and continue adding two nodes.\n          var oldBody = node.body;\n          node.body = null; // internal nodes do not carry bodies\n\n          if (isSamePosition(oldBody.pos, body.pos)) {\n            // Prevent infinite subdivision by bumping one node\n            // anywhere in this quadrant\n            var retriesCount = 3;\n            do {\n              var offset = random.nextDouble();\n              var dx = (node.right - node.left) * offset;\n              var dy = (node.bottom - node.top) * offset;\n              var dz = (node.front - node.back) * offset;\n\n              oldBody.pos.x = node.left + dx;\n              oldBody.pos.y = node.top + dy;\n              oldBody.pos.z = node.back + dz;\n              retriesCount -= 1;\n              // Make sure we don't bump it out of the box. If we do, next iteration should fix it\n            } while (retriesCount > 0 && isSamePosition(oldBody.pos, body.pos));\n\n            if (retriesCount === 0 && isSamePosition(oldBody.pos, body.pos)) {\n              // This is very bad, we ran out of precision.\n              // if we do not return from the method we'll get into\n              // infinite loop here. So we sacrifice correctness of layout, and keep the app running\n              // Next layout iteration should get larger bounding box in the first step and fix this\n              return;\n            }\n          }\n          // Next iteration should subdivide node further.\n          insertStack.push(node, oldBody);\n          insertStack.push(node, body);\n        }\n      }\n    },\n\n    update = function(sourceBody) {\n      var queue = updateQueue,\n        v,\n        dx, dy, dz,\n        r, fx = 0,\n        fy = 0,\n        fz = 0,\n        queueLength = 1,\n        shiftIdx = 0,\n        pushIdx = 1;\n\n      queue[0] = root;\n\n      while (queueLength) {\n        var node = queue[shiftIdx],\n          body = node.body;\n\n        queueLength -= 1;\n        shiftIdx += 1;\n        var differentBody = (body !== sourceBody);\n        if (body && differentBody) {\n          // If the current node is a leaf node (and it is not source body),\n          // calculate the force exerted by the current node on body, and add this\n          // amount to body's net force.\n          dx = body.pos.x - sourceBody.pos.x;\n          dy = body.pos.y - sourceBody.pos.y;\n          dz = body.pos.z - sourceBody.pos.z;\n          r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n\n          if (r === 0) {\n            // Poor man's protection against zero distance.\n            dx = (random.nextDouble() - 0.5) / 50;\n            dy = (random.nextDouble() - 0.5) / 50;\n            dz = (random.nextDouble() - 0.5) / 50;\n            r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n          }\n\n          // This is standard gravitation force calculation but we divide\n          // by r^3 to save two operations when normalizing force vector.\n          v = gravity * body.mass * sourceBody.mass / (r * r * r);\n          fx += v * dx;\n          fy += v * dy;\n          fz += v * dz;\n        } else if (differentBody) {\n          // Otherwise, calculate the ratio s / r,  where s is the width of the region\n          // represented by the internal node, and r is the distance between the body\n          // and the node's center-of-mass\n          dx = node.massX / node.mass - sourceBody.pos.x;\n          dy = node.massY / node.mass - sourceBody.pos.y;\n          dz = node.massZ / node.mass - sourceBody.pos.z;\n\n          r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n\n          if (r === 0) {\n            // Sorry about code duplication. I don't want to create many functions\n            // right away. Just want to see performance first.\n            dx = (random.nextDouble() - 0.5) / 50;\n            dy = (random.nextDouble() - 0.5) / 50;\n            dz = (random.nextDouble() - 0.5) / 50;\n            r = Math.sqrt(dx * dx + dy * dy + dz * dz);\n          }\n\n          // If s / r < θ, treat this internal node as a single body, and calculate the\n          // force it exerts on sourceBody, and add this amount to sourceBody's net force.\n          if ((node.right - node.left) / r < theta) {\n            // in the if statement above we consider node's width only\n            // because the region was squarified during tree creation.\n            // Thus there is no difference between using width or height.\n            v = gravity * node.mass * sourceBody.mass / (r * r * r);\n            fx += v * dx;\n            fy += v * dy;\n            fz += v * dz;\n          } else {\n            // Otherwise, run the procedure recursively on each of the current node's children.\n\n            // I intentionally unfolded this loop, to save several CPU cycles.\n            if (node.quad0) {\n              queue[pushIdx] = node.quad0;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad1) {\n              queue[pushIdx] = node.quad1;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad2) {\n              queue[pushIdx] = node.quad2;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad3) {\n              queue[pushIdx] = node.quad3;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad4) {\n              queue[pushIdx] = node.quad4;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad5) {\n              queue[pushIdx] = node.quad5;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad6) {\n              queue[pushIdx] = node.quad6;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad7) {\n              queue[pushIdx] = node.quad7;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n          }\n        }\n      }\n\n      sourceBody.force.x += fx;\n      sourceBody.force.y += fy;\n      sourceBody.force.z += fz;\n    },\n\n    insertBodies = function(bodies) {\n      var x1 = Number.MAX_VALUE,\n        y1 = Number.MAX_VALUE,\n        z1 = Number.MAX_VALUE,\n        x2 = Number.MIN_VALUE,\n        y2 = Number.MIN_VALUE,\n        z2 = Number.MIN_VALUE,\n        i,\n        max = bodies.length;\n\n      // To reduce quad tree depth we are looking for exact bounding box of all particles.\n      i = max;\n      while (i--) {\n        var pos = bodies[i].pos;\n        var x = pos.x;\n        var y = pos.y;\n        var z = pos.z;\n        if (x < x1) {\n          x1 = x;\n        }\n        if (x > x2) {\n          x2 = x;\n        }\n        if (y < y1) {\n          y1 = y;\n        }\n        if (y > y2) {\n          y2 = y;\n        }\n        if (z < z1) {\n          z1 = z;\n        }\n        if (z > z2) {\n          z2 = z;\n        }\n      }\n\n      // Squarify the bounds.\n      var maxSide = Math.max(x2 - x1, Math.max(y2 - y1, z2 - z1));\n\n      x2 = x1 + maxSide;\n      y2 = y1 + maxSide;\n      z2 = z1 + maxSide;\n\n      currentInCache = 0;\n      root = newNode();\n      root.left = x1;\n      root.right = x2;\n      root.top = y1;\n      root.bottom = y2;\n      root.back = z1;\n      root.front = z2;\n\n      i = max - 1;\n      if (i > 0) {\n        root.body = bodies[i];\n      }\n      while (i--) {\n        insert(bodies[i], root);\n      }\n    };\n\n  return {\n    insertBodies: insertBodies,\n    updateBodyForce: update,\n    options: function(newOptions) {\n      if (newOptions) {\n        if (typeof newOptions.gravity === 'number') {\n          gravity = newOptions.gravity;\n        }\n        if (typeof newOptions.theta === 'number') {\n          theta = newOptions.theta;\n        }\n\n        return this;\n      }\n\n      return {\n        gravity: gravity,\n        theta: theta\n      };\n    }\n  };\n};\n\nfunction getChild(node, idx) {\n  if (idx === 0) return node.quad0;\n  if (idx === 1) return node.quad1;\n  if (idx === 2) return node.quad2;\n  if (idx === 3) return node.quad3;\n  if (idx === 4) return node.quad4;\n  if (idx === 5) return node.quad5;\n  if (idx === 6) return node.quad6;\n  if (idx === 7) return node.quad7;\n  return null;\n}\n\nfunction setChild(node, idx, child) {\n  if (idx === 0) node.quad0 = child;\n  else if (idx === 1) node.quad1 = child;\n  else if (idx === 2) node.quad2 = child;\n  else if (idx === 3) node.quad3 = child;\n  else if (idx === 4) node.quad4 = child;\n  else if (idx === 5) node.quad5 = child;\n  else if (idx === 6) node.quad6 = child;\n  else if (idx === 7) node.quad7 = child;\n}\n","module.exports = InsertStack;\n\n/**\n * Our implementation of QuadTree is non-recursive to avoid GC hit\n * This data structure represent stack of elements\n * which we are trying to insert into quad tree.\n */\nfunction InsertStack () {\n    this.stack = [];\n    this.popIdx = 0;\n}\n\nInsertStack.prototype = {\n    isEmpty: function() {\n        return this.popIdx === 0;\n    },\n    push: function (node, body) {\n        var item = this.stack[this.popIdx];\n        if (!item) {\n            // we are trying to avoid memory pressure: create new element\n            // only when absolutely necessary\n            this.stack[this.popIdx] = new InsertStackElement(node, body);\n        } else {\n            item.node = node;\n            item.body = body;\n        }\n        ++this.popIdx;\n    },\n    pop: function () {\n        if (this.popIdx > 0) {\n            return this.stack[--this.popIdx];\n        }\n    },\n    reset: function () {\n        this.popIdx = 0;\n    }\n};\n\nfunction InsertStackElement(node, body) {\n    this.node = node; // QuadTree node\n    this.body = body; // physical body which needs to be inserted to node\n}\n","module.exports = function isSamePosition(point1, point2) {\n    var dx = Math.abs(point1.x - point2.x);\n    var dy = Math.abs(point1.y - point2.y);\n    var dz = Math.abs(point1.z - point2.z);\n\n    return (dx < 1e-8 && dy < 1e-8 && dz < 1e-8);\n};\n","/**\n * Internal data structure to represent 3D QuadTree node\n */\nmodule.exports = function Node() {\n  // body stored inside this node. In quad tree only leaf nodes (by construction)\n  // contain boides:\n  this.body = null;\n\n  // Child nodes are stored in quads. Each quad is presented by number:\n  // Behind Z median:\n  // 0 | 1\n  // -----\n  // 2 | 3\n  // In front of Z median:\n  // 4 | 5\n  // -----\n  // 6 | 7\n  this.quad0 = null;\n  this.quad1 = null;\n  this.quad2 = null;\n  this.quad3 = null;\n  this.quad4 = null;\n  this.quad5 = null;\n  this.quad6 = null;\n  this.quad7 = null;\n\n  // Total mass of current node\n  this.mass = 0;\n\n  // Center of mass coordinates\n  this.massX = 0;\n  this.massY = 0;\n  this.massZ = 0;\n\n  // bounding box coordinates\n  this.left = 0;\n  this.top = 0;\n  this.bottom = 0;\n  this.right = 0;\n  this.front = 0;\n  this.back = 0;\n};\n","/**\n * This is Barnes Hut simulation algorithm for 2d case. Implementation\n * is highly optimized (avoids recusion and gc pressure)\n *\n * http://www.cs.princeton.edu/courses/archive/fall03/cs126/assignments/barnes-hut.html\n */\n\nmodule.exports = function(options) {\n  options = options || {};\n  options.gravity = typeof options.gravity === 'number' ? options.gravity : -1;\n  options.theta = typeof options.theta === 'number' ? options.theta : 0.8;\n\n  // we require deterministic randomness here\n  var random = require('ngraph.random').random(1984),\n    Node = require('./node'),\n    InsertStack = require('./insertStack'),\n    isSamePosition = require('./isSamePosition');\n\n  var gravity = options.gravity,\n    updateQueue = [],\n    insertStack = new InsertStack(),\n    theta = options.theta,\n\n    nodesCache = [],\n    currentInCache = 0,\n    newNode = function() {\n      // To avoid pressure on GC we reuse nodes.\n      var node = nodesCache[currentInCache];\n      if (node) {\n        node.quad0 = null;\n        node.quad1 = null;\n        node.quad2 = null;\n        node.quad3 = null;\n        node.body = null;\n        node.mass = node.massX = node.massY = 0;\n        node.left = node.right = node.top = node.bottom = 0;\n      } else {\n        node = new Node();\n        nodesCache[currentInCache] = node;\n      }\n\n      ++currentInCache;\n      return node;\n    },\n\n    root = newNode(),\n\n    // Inserts body to the tree\n    insert = function(newBody) {\n      insertStack.reset();\n      insertStack.push(root, newBody);\n\n      while (!insertStack.isEmpty()) {\n        var stackItem = insertStack.pop(),\n          node = stackItem.node,\n          body = stackItem.body;\n\n        if (!node.body) {\n          // This is internal node. Update the total mass of the node and center-of-mass.\n          var x = body.pos.x;\n          var y = body.pos.y;\n          node.mass = node.mass + body.mass;\n          node.massX = node.massX + body.mass * x;\n          node.massY = node.massY + body.mass * y;\n\n          // Recursively insert the body in the appropriate quadrant.\n          // But first find the appropriate quadrant.\n          var quadIdx = 0, // Assume we are in the 0's quad.\n            left = node.left,\n            right = (node.right + left) / 2,\n            top = node.top,\n            bottom = (node.bottom + top) / 2;\n\n          if (x > right) { // somewhere in the eastern part.\n            quadIdx = quadIdx + 1;\n            var oldLeft = left;\n            left = right;\n            right = right + (right - oldLeft);\n          }\n          if (y > bottom) { // and in south.\n            quadIdx = quadIdx + 2;\n            var oldTop = top;\n            top = bottom;\n            bottom = bottom + (bottom - oldTop);\n          }\n\n          var child = getChild(node, quadIdx);\n          if (!child) {\n            // The node is internal but this quadrant is not taken. Add\n            // subnode to it.\n            child = newNode();\n            child.left = left;\n            child.top = top;\n            child.right = right;\n            child.bottom = bottom;\n            child.body = body;\n\n            setChild(node, quadIdx, child);\n          } else {\n            // continue searching in this quadrant.\n            insertStack.push(child, body);\n          }\n        } else {\n          // We are trying to add to the leaf node.\n          // We have to convert current leaf into internal node\n          // and continue adding two nodes.\n          var oldBody = node.body;\n          node.body = null; // internal nodes do not cary bodies\n\n          if (isSamePosition(oldBody.pos, body.pos)) {\n            // Prevent infinite subdivision by bumping one node\n            // anywhere in this quadrant\n            var retriesCount = 3;\n            do {\n              var offset = random.nextDouble();\n              var dx = (node.right - node.left) * offset;\n              var dy = (node.bottom - node.top) * offset;\n\n              oldBody.pos.x = node.left + dx;\n              oldBody.pos.y = node.top + dy;\n              retriesCount -= 1;\n              // Make sure we don't bump it out of the box. If we do, next iteration should fix it\n            } while (retriesCount > 0 && isSamePosition(oldBody.pos, body.pos));\n\n            if (retriesCount === 0 && isSamePosition(oldBody.pos, body.pos)) {\n              // This is very bad, we ran out of precision.\n              // if we do not return from the method we'll get into\n              // infinite loop here. So we sacrifice correctness of layout, and keep the app running\n              // Next layout iteration should get larger bounding box in the first step and fix this\n              return;\n            }\n          }\n          // Next iteration should subdivide node further.\n          insertStack.push(node, oldBody);\n          insertStack.push(node, body);\n        }\n      }\n    },\n\n    update = function(sourceBody) {\n      var queue = updateQueue,\n        v,\n        dx,\n        dy,\n        r, fx = 0,\n        fy = 0,\n        queueLength = 1,\n        shiftIdx = 0,\n        pushIdx = 1;\n\n      queue[0] = root;\n\n      while (queueLength) {\n        var node = queue[shiftIdx],\n          body = node.body;\n\n        queueLength -= 1;\n        shiftIdx += 1;\n        var differentBody = (body !== sourceBody);\n        if (body && differentBody) {\n          // If the current node is a leaf node (and it is not source body),\n          // calculate the force exerted by the current node on body, and add this\n          // amount to body's net force.\n          dx = body.pos.x - sourceBody.pos.x;\n          dy = body.pos.y - sourceBody.pos.y;\n          r = Math.sqrt(dx * dx + dy * dy);\n\n          if (r === 0) {\n            // Poor man's protection against zero distance.\n            dx = (random.nextDouble() - 0.5) / 50;\n            dy = (random.nextDouble() - 0.5) / 50;\n            r = Math.sqrt(dx * dx + dy * dy);\n          }\n\n          // This is standard gravition force calculation but we divide\n          // by r^3 to save two operations when normalizing force vector.\n          v = gravity * body.mass * sourceBody.mass / (r * r * r);\n          fx += v * dx;\n          fy += v * dy;\n        } else if (differentBody) {\n          // Otherwise, calculate the ratio s / r,  where s is the width of the region\n          // represented by the internal node, and r is the distance between the body\n          // and the node's center-of-mass\n          dx = node.massX / node.mass - sourceBody.pos.x;\n          dy = node.massY / node.mass - sourceBody.pos.y;\n          r = Math.sqrt(dx * dx + dy * dy);\n\n          if (r === 0) {\n            // Sorry about code duplucation. I don't want to create many functions\n            // right away. Just want to see performance first.\n            dx = (random.nextDouble() - 0.5) / 50;\n            dy = (random.nextDouble() - 0.5) / 50;\n            r = Math.sqrt(dx * dx + dy * dy);\n          }\n          // If s / r < θ, treat this internal node as a single body, and calculate the\n          // force it exerts on sourceBody, and add this amount to sourceBody's net force.\n          if ((node.right - node.left) / r < theta) {\n            // in the if statement above we consider node's width only\n            // because the region was squarified during tree creation.\n            // Thus there is no difference between using width or height.\n            v = gravity * node.mass * sourceBody.mass / (r * r * r);\n            fx += v * dx;\n            fy += v * dy;\n          } else {\n            // Otherwise, run the procedure recursively on each of the current node's children.\n\n            // I intentionally unfolded this loop, to save several CPU cycles.\n            if (node.quad0) {\n              queue[pushIdx] = node.quad0;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad1) {\n              queue[pushIdx] = node.quad1;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad2) {\n              queue[pushIdx] = node.quad2;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n            if (node.quad3) {\n              queue[pushIdx] = node.quad3;\n              queueLength += 1;\n              pushIdx += 1;\n            }\n          }\n        }\n      }\n\n      sourceBody.force.x += fx;\n      sourceBody.force.y += fy;\n    },\n\n    insertBodies = function(bodies) {\n      var x1 = Number.MAX_VALUE,\n        y1 = Number.MAX_VALUE,\n        x2 = Number.MIN_VALUE,\n        y2 = Number.MIN_VALUE,\n        i,\n        max = bodies.length;\n\n      // To reduce quad tree depth we are looking for exact bounding box of all particles.\n      i = max;\n      while (i--) {\n        var x = bodies[i].pos.x;\n        var y = bodies[i].pos.y;\n        if (x < x1) {\n          x1 = x;\n        }\n        if (x > x2) {\n          x2 = x;\n        }\n        if (y < y1) {\n          y1 = y;\n        }\n        if (y > y2) {\n          y2 = y;\n        }\n      }\n\n      // Squarify the bounds.\n      var dx = x2 - x1,\n        dy = y2 - y1;\n      if (dx > dy) {\n        y2 = y1 + dx;\n      } else {\n        x2 = x1 + dy;\n      }\n\n      currentInCache = 0;\n      root = newNode();\n      root.left = x1;\n      root.right = x2;\n      root.top = y1;\n      root.bottom = y2;\n\n      i = max - 1;\n      if (i > 0) {\n        root.body = bodies[i];\n      }\n      while (i--) {\n        insert(bodies[i], root);\n      }\n    };\n\n  return {\n    insertBodies: insertBodies,\n    updateBodyForce: update,\n    options: function(newOptions) {\n      if (newOptions) {\n        if (typeof newOptions.gravity === 'number') {\n          gravity = newOptions.gravity;\n        }\n        if (typeof newOptions.theta === 'number') {\n          theta = newOptions.theta;\n        }\n\n        return this;\n      }\n\n      return {\n        gravity: gravity,\n        theta: theta\n      };\n    }\n  };\n};\n\nfunction getChild(node, idx) {\n  if (idx === 0) return node.quad0;\n  if (idx === 1) return node.quad1;\n  if (idx === 2) return node.quad2;\n  if (idx === 3) return node.quad3;\n  return null;\n}\n\nfunction setChild(node, idx, child) {\n  if (idx === 0) node.quad0 = child;\n  else if (idx === 1) node.quad1 = child;\n  else if (idx === 2) node.quad2 = child;\n  else if (idx === 3) node.quad3 = child;\n}\n","module.exports = InsertStack;\n\n/**\n * Our implmentation of QuadTree is non-recursive to avoid GC hit\n * This data structure represent stack of elements\n * which we are trying to insert into quad tree.\n */\nfunction InsertStack () {\n    this.stack = [];\n    this.popIdx = 0;\n}\n\nInsertStack.prototype = {\n    isEmpty: function() {\n        return this.popIdx === 0;\n    },\n    push: function (node, body) {\n        var item = this.stack[this.popIdx];\n        if (!item) {\n            // we are trying to avoid memory pressue: create new element\n            // only when absolutely necessary\n            this.stack[this.popIdx] = new InsertStackElement(node, body);\n        } else {\n            item.node = node;\n            item.body = body;\n        }\n        ++this.popIdx;\n    },\n    pop: function () {\n        if (this.popIdx > 0) {\n            return this.stack[--this.popIdx];\n        }\n    },\n    reset: function () {\n        this.popIdx = 0;\n    }\n};\n\nfunction InsertStackElement(node, body) {\n    this.node = node; // QuadTree node\n    this.body = body; // physical body which needs to be inserted to node\n}\n","module.exports = function isSamePosition(point1, point2) {\n    var dx = Math.abs(point1.x - point2.x);\n    var dy = Math.abs(point1.y - point2.y);\n\n    return (dx < 1e-8 && dy < 1e-8);\n};\n","/**\n * Internal data structure to represent 2D QuadTree node\n */\nmodule.exports = function Node() {\n  // body stored inside this node. In quad tree only leaf nodes (by construction)\n  // contain boides:\n  this.body = null;\n\n  // Child nodes are stored in quads. Each quad is presented by number:\n  // 0 | 1\n  // -----\n  // 2 | 3\n  this.quad0 = null;\n  this.quad1 = null;\n  this.quad2 = null;\n  this.quad3 = null;\n\n  // Total mass of current node\n  this.mass = 0;\n\n  // Center of mass coordinates\n  this.massX = 0;\n  this.massY = 0;\n\n  // bounding box coordinates\n  this.left = 0;\n  this.top = 0;\n  this.bottom = 0;\n  this.right = 0;\n};\n","module.exports = {\n  random: random,\n  randomIterator: randomIterator\n};\n\n/**\n * Creates seeded PRNG with two methods:\n *   next() and nextDouble()\n */\nfunction random(inputSeed) {\n  var seed = typeof inputSeed === 'number' ? inputSeed : (+ new Date());\n  var randomFunc = function() {\n      // Robert Jenkins' 32 bit integer hash function.\n      seed = ((seed + 0x7ed55d16) + (seed << 12))  & 0xffffffff;\n      seed = ((seed ^ 0xc761c23c) ^ (seed >>> 19)) & 0xffffffff;\n      seed = ((seed + 0x165667b1) + (seed << 5))   & 0xffffffff;\n      seed = ((seed + 0xd3a2646c) ^ (seed << 9))   & 0xffffffff;\n      seed = ((seed + 0xfd7046c5) + (seed << 3))   & 0xffffffff;\n      seed = ((seed ^ 0xb55a4f09) ^ (seed >>> 16)) & 0xffffffff;\n      return (seed & 0xfffffff) / 0x10000000;\n  };\n\n  return {\n      /**\n       * Generates random integer number in the range from 0 (inclusive) to maxValue (exclusive)\n       *\n       * @param maxValue Number REQUIRED. Ommitting this number will result in NaN values from PRNG.\n       */\n      next : function (maxValue) {\n          return Math.floor(randomFunc() * maxValue);\n      },\n\n      /**\n       * Generates random double number in the range from 0 (inclusive) to 1 (exclusive)\n       * This function is the same as Math.random() (except that it could be seeded)\n       */\n      nextDouble : function () {\n          return randomFunc();\n      }\n  };\n}\n\n/*\n * Creates iterator over array, which returns items of array in random order\n * Time complexity is guaranteed to be O(n);\n */\nfunction randomIterator(array, customRandom) {\n    var localRandom = customRandom || random();\n    if (typeof localRandom.next !== 'function') {\n      throw new Error('customRandom does not match expected API: next() function is missing');\n    }\n\n    return {\n        forEach : function (callback) {\n            var i, j, t;\n            for (i = array.length - 1; i > 0; --i) {\n                j = localRandom.next(i + 1); // i inclusive\n                t = array[j];\n                array[j] = array[i];\n                array[i] = t;\n\n                callback(t);\n            }\n\n            if (array.length) {\n                callback(array[0]);\n            }\n        },\n\n        /**\n         * Shuffles array randomly, in place.\n         */\n        shuffle : function () {\n            var i, j, t;\n            for (i = array.length - 1; i > 0; --i) {\n                j = localRandom.next(i + 1); // i inclusive\n                t = array[j];\n                array[j] = array[i];\n                array[i] = t;\n            }\n\n            return array;\n        }\n    };\n}\n","module.exports = save;\n\nfunction save(graph, customNodeTransform, customLinkTransform) {\n  // Object contains `nodes` and `links` arrays.\n  var result = {\n    nodes: [],\n    links: []\n  };\n\n  var nodeTransform = customNodeTransform || defaultTransformForNode;\n  var linkTransform = customLinkTransform || defaultTransformForLink;\n\n  graph.forEachNode(saveNode);\n  graph.forEachLink(saveLink);\n\n  return JSON.stringify(result);\n\n  function saveNode(node) {\n    // Each node of the graph is processed to take only required fields\n    // `id` and `data`\n    result.nodes.push(nodeTransform(node));\n  }\n\n  function saveLink(link) {\n    // Each link of the graph is also processed to take `fromId`, `toId` and\n    // `data`\n    result.links.push(linkTransform(link));\n  }\n\n  function defaultTransformForNode(node) {\n    var result = {\n      id: node.id\n    };\n    // We don't want to store undefined fields when it's not necessary:\n    if (node.data !== undefined) {\n      result.data = node.data;\n    }\n\n    return result;\n  }\n\n  function defaultTransformForLink(link) {\n    var result = {\n      fromId: link.fromId,\n      toId: link.toId,\n    };\n\n    if (link.data !== undefined) {\n      result.data = link.data;\n    }\n\n    return result;\n  }\n}\n","// shim for using process in browser\n\nvar process = module.exports = {};\nvar queue = [];\nvar draining = false;\nvar currentQueue;\nvar queueIndex = -1;\n\nfunction cleanUpNextTick() {\n    draining = false;\n    if (currentQueue.length) {\n        queue = currentQueue.concat(queue);\n    } else {\n        queueIndex = -1;\n    }\n    if (queue.length) {\n        drainQueue();\n    }\n}\n\nfunction drainQueue() {\n    if (draining) {\n        return;\n    }\n    var timeout = setTimeout(cleanUpNextTick);\n    draining = true;\n\n    var len = queue.length;\n    while(len) {\n        currentQueue = queue;\n        queue = [];\n        while (++queueIndex < len) {\n            if (currentQueue) {\n                currentQueue[queueIndex].run();\n            }\n        }\n        queueIndex = -1;\n        len = queue.length;\n    }\n    currentQueue = null;\n    draining = false;\n    clearTimeout(timeout);\n}\n\nprocess.nextTick = function (fun) {\n    var args = new Array(arguments.length - 1);\n    if (arguments.length > 1) {\n        for (var i = 1; i < arguments.length; i++) {\n            args[i - 1] = arguments[i];\n        }\n    }\n    queue.push(new Item(fun, args));\n    if (queue.length === 1 && !draining) {\n        setTimeout(drainQueue, 0);\n    }\n};\n\n// v8 likes predictible objects\nfunction Item(fun, array) {\n    this.fun = fun;\n    this.array = array;\n}\nItem.prototype.run = function () {\n    this.fun.apply(null, this.array);\n};\nprocess.title = 'browser';\nprocess.browser = true;\nprocess.env = {};\nprocess.argv = [];\nprocess.version = ''; // empty string to avoid regexp issues\nprocess.versions = {};\n\nfunction noop() {}\n\nprocess.on = noop;\nprocess.addListener = noop;\nprocess.once = noop;\nprocess.off = noop;\nprocess.removeListener = noop;\nprocess.removeAllListeners = noop;\nprocess.emit = noop;\n\nprocess.binding = function (name) {\n    throw new Error('process.binding is not supported');\n};\n\nprocess.cwd = function () { return '/' };\nprocess.chdir = function (dir) {\n    throw new Error('process.chdir is not supported');\n};\nprocess.umask = function() { return 0; };\n","//     Underscore.js 1.8.3\n//     http://underscorejs.org\n//     (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors\n//     Underscore may be freely distributed under the MIT license.\n\n(function() {\n\n  // Baseline setup\n  // --------------\n\n  // Establish the root object, `window` in the browser, or `exports` on the server.\n  var root = this;\n\n  // Save the previous value of the `_` variable.\n  var previousUnderscore = root._;\n\n  // Save bytes in the minified (but not gzipped) version:\n  var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;\n\n  // Create quick reference variables for speed access to core prototypes.\n  var\n    push             = ArrayProto.push,\n    slice            = ArrayProto.slice,\n    toString         = ObjProto.toString,\n    hasOwnProperty   = ObjProto.hasOwnProperty;\n\n  // All **ECMAScript 5** native function implementations that we hope to use\n  // are declared here.\n  var\n    nativeIsArray      = Array.isArray,\n    nativeKeys         = Object.keys,\n    nativeBind         = FuncProto.bind,\n    nativeCreate       = Object.create;\n\n  // Naked function reference for surrogate-prototype-swapping.\n  var Ctor = function(){};\n\n  // Create a safe reference to the Underscore object for use below.\n  var _ = function(obj) {\n    if (obj instanceof _) return obj;\n    if (!(this instanceof _)) return new _(obj);\n    this._wrapped = obj;\n  };\n\n  // Export the Underscore object for **Node.js**, with\n  // backwards-compatibility for the old `require()` API. If we're in\n  // the browser, add `_` as a global object.\n  if (typeof exports !== 'undefined') {\n    if (typeof module !== 'undefined' && module.exports) {\n      exports = module.exports = _;\n    }\n    exports._ = _;\n  } else {\n    root._ = _;\n  }\n\n  // Current version.\n  _.VERSION = '1.8.3';\n\n  // Internal function that returns an efficient (for current engines) version\n  // of the passed-in callback, to be repeatedly applied in other Underscore\n  // functions.\n  var optimizeCb = function(func, context, argCount) {\n    if (context === void 0) return func;\n    switch (argCount == null ? 3 : argCount) {\n      case 1: return function(value) {\n        return func.call(context, value);\n      };\n      case 2: return function(value, other) {\n        return func.call(context, value, other);\n      };\n      case 3: return function(value, index, collection) {\n        return func.call(context, value, index, collection);\n      };\n      case 4: return function(accumulator, value, index, collection) {\n        return func.call(context, accumulator, value, index, collection);\n      };\n    }\n    return function() {\n      return func.apply(context, arguments);\n    };\n  };\n\n  // A mostly-internal function to generate callbacks that can be applied\n  // to each element in a collection, returning the desired result — either\n  // identity, an arbitrary callback, a property matcher, or a property accessor.\n  var cb = function(value, context, argCount) {\n    if (value == null) return _.identity;\n    if (_.isFunction(value)) return optimizeCb(value, context, argCount);\n    if (_.isObject(value)) return _.matcher(value);\n    return _.property(value);\n  };\n  _.iteratee = function(value, context) {\n    return cb(value, context, Infinity);\n  };\n\n  // An internal function for creating assigner functions.\n  var createAssigner = function(keysFunc, undefinedOnly) {\n    return function(obj) {\n      var length = arguments.length;\n      if (length < 2 || obj == null) return obj;\n      for (var index = 1; index < length; index++) {\n        var source = arguments[index],\n            keys = keysFunc(source),\n            l = keys.length;\n        for (var i = 0; i < l; i++) {\n          var key = keys[i];\n          if (!undefinedOnly || obj[key] === void 0) obj[key] = source[key];\n        }\n      }\n      return obj;\n    };\n  };\n\n  // An internal function for creating a new object that inherits from another.\n  var baseCreate = function(prototype) {\n    if (!_.isObject(prototype)) return {};\n    if (nativeCreate) return nativeCreate(prototype);\n    Ctor.prototype = prototype;\n    var result = new Ctor;\n    Ctor.prototype = null;\n    return result;\n  };\n\n  var property = function(key) {\n    return function(obj) {\n      return obj == null ? void 0 : obj[key];\n    };\n  };\n\n  // Helper for collection methods to determine whether a collection\n  // should be iterated as an array or as an object\n  // Related: http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength\n  // Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094\n  var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;\n  var getLength = property('length');\n  var isArrayLike = function(collection) {\n    var length = getLength(collection);\n    return typeof length == 'number' && length >= 0 && length <= MAX_ARRAY_INDEX;\n  };\n\n  // Collection Functions\n  // --------------------\n\n  // The cornerstone, an `each` implementation, aka `forEach`.\n  // Handles raw objects in addition to array-likes. Treats all\n  // sparse array-likes as if they were dense.\n  _.each = _.forEach = function(obj, iteratee, context) {\n    iteratee = optimizeCb(iteratee, context);\n    var i, length;\n    if (isArrayLike(obj)) {\n      for (i = 0, length = obj.length; i < length; i++) {\n        iteratee(obj[i], i, obj);\n      }\n    } else {\n      var keys = _.keys(obj);\n      for (i = 0, length = keys.length; i < length; i++) {\n        iteratee(obj[keys[i]], keys[i], obj);\n      }\n    }\n    return obj;\n  };\n\n  // Return the results of applying the iteratee to each element.\n  _.map = _.collect = function(obj, iteratee, context) {\n    iteratee = cb(iteratee, context);\n    var keys = !isArrayLike(obj) && _.keys(obj),\n        length = (keys || obj).length,\n        results = Array(length);\n    for (var index = 0; index < length; index++) {\n      var currentKey = keys ? keys[index] : index;\n      results[index] = iteratee(obj[currentKey], currentKey, obj);\n    }\n    return results;\n  };\n\n  // Create a reducing function iterating left or right.\n  function createReduce(dir) {\n    // Optimized iterator function as using arguments.length\n    // in the main function will deoptimize the, see #1991.\n    function iterator(obj, iteratee, memo, keys, index, length) {\n      for (; index >= 0 && index < length; index += dir) {\n        var currentKey = keys ? keys[index] : index;\n        memo = iteratee(memo, obj[currentKey], currentKey, obj);\n      }\n      return memo;\n    }\n\n    return function(obj, iteratee, memo, context) {\n      iteratee = optimizeCb(iteratee, context, 4);\n      var keys = !isArrayLike(obj) && _.keys(obj),\n          length = (keys || obj).length,\n          index = dir > 0 ? 0 : length - 1;\n      // Determine the initial value if none is provided.\n      if (arguments.length < 3) {\n        memo = obj[keys ? keys[index] : index];\n        index += dir;\n      }\n      return iterator(obj, iteratee, memo, keys, index, length);\n    };\n  }\n\n  // **Reduce** builds up a single result from a list of values, aka `inject`,\n  // or `foldl`.\n  _.reduce = _.foldl = _.inject = createReduce(1);\n\n  // The right-associative version of reduce, also known as `foldr`.\n  _.reduceRight = _.foldr = createReduce(-1);\n\n  // Return the first value which passes a truth test. Aliased as `detect`.\n  _.find = _.detect = function(obj, predicate, context) {\n    var key;\n    if (isArrayLike(obj)) {\n      key = _.findIndex(obj, predicate, context);\n    } else {\n      key = _.findKey(obj, predicate, context);\n    }\n    if (key !== void 0 && key !== -1) return obj[key];\n  };\n\n  // Return all the elements that pass a truth test.\n  // Aliased as `select`.\n  _.filter = _.select = function(obj, predicate, context) {\n    var results = [];\n    predicate = cb(predicate, context);\n    _.each(obj, function(value, index, list) {\n      if (predicate(value, index, list)) results.push(value);\n    });\n    return results;\n  };\n\n  // Return all the elements for which a truth test fails.\n  _.reject = function(obj, predicate, context) {\n    return _.filter(obj, _.negate(cb(predicate)), context);\n  };\n\n  // Determine whether all of the elements match a truth test.\n  // Aliased as `all`.\n  _.every = _.all = function(obj, predicate, context) {\n    predicate = cb(predicate, context);\n    var keys = !isArrayLike(obj) && _.keys(obj),\n        length = (keys || obj).length;\n    for (var index = 0; index < length; index++) {\n      var currentKey = keys ? keys[index] : index;\n      if (!predicate(obj[currentKey], currentKey, obj)) return false;\n    }\n    return true;\n  };\n\n  // Determine if at least one element in the object matches a truth test.\n  // Aliased as `any`.\n  _.some = _.any = function(obj, predicate, context) {\n    predicate = cb(predicate, context);\n    var keys = !isArrayLike(obj) && _.keys(obj),\n        length = (keys || obj).length;\n    for (var index = 0; index < length; index++) {\n      var currentKey = keys ? keys[index] : index;\n      if (predicate(obj[currentKey], currentKey, obj)) return true;\n    }\n    return false;\n  };\n\n  // Determine if the array or object contains a given item (using `===`).\n  // Aliased as `includes` and `include`.\n  _.contains = _.includes = _.include = function(obj, item, fromIndex, guard) {\n    if (!isArrayLike(obj)) obj = _.values(obj);\n    if (typeof fromIndex != 'number' || guard) fromIndex = 0;\n    return _.indexOf(obj, item, fromIndex) >= 0;\n  };\n\n  // Invoke a method (with arguments) on every item in a collection.\n  _.invoke = function(obj, method) {\n    var args = slice.call(arguments, 2);\n    var isFunc = _.isFunction(method);\n    return _.map(obj, function(value) {\n      var func = isFunc ? method : value[method];\n      return func == null ? func : func.apply(value, args);\n    });\n  };\n\n  // Convenience version of a common use case of `map`: fetching a property.\n  _.pluck = function(obj, key) {\n    return _.map(obj, _.property(key));\n  };\n\n  // Convenience version of a common use case of `filter`: selecting only objects\n  // containing specific `key:value` pairs.\n  _.where = function(obj, attrs) {\n    return _.filter(obj, _.matcher(attrs));\n  };\n\n  // Convenience version of a common use case of `find`: getting the first object\n  // containing specific `key:value` pairs.\n  _.findWhere = function(obj, attrs) {\n    return _.find(obj, _.matcher(attrs));\n  };\n\n  // Return the maximum element (or element-based computation).\n  _.max = function(obj, iteratee, context) {\n    var result = -Infinity, lastComputed = -Infinity,\n        value, computed;\n    if (iteratee == null && obj != null) {\n      obj = isArrayLike(obj) ? obj : _.values(obj);\n      for (var i = 0, length = obj.length; i < length; i++) {\n        value = obj[i];\n        if (value > result) {\n          result = value;\n        }\n      }\n    } else {\n      iteratee = cb(iteratee, context);\n      _.each(obj, function(value, index, list) {\n        computed = iteratee(value, index, list);\n        if (computed > lastComputed || computed === -Infinity && result === -Infinity) {\n          result = value;\n          lastComputed = computed;\n        }\n      });\n    }\n    return result;\n  };\n\n  // Return the minimum element (or element-based computation).\n  _.min = function(obj, iteratee, context) {\n    var result = Infinity, lastComputed = Infinity,\n        value, computed;\n    if (iteratee == null && obj != null) {\n      obj = isArrayLike(obj) ? obj : _.values(obj);\n      for (var i = 0, length = obj.length; i < length; i++) {\n        value = obj[i];\n        if (value < result) {\n          result = value;\n        }\n      }\n    } else {\n      iteratee = cb(iteratee, context);\n      _.each(obj, function(value, index, list) {\n        computed = iteratee(value, index, list);\n        if (computed < lastComputed || computed === Infinity && result === Infinity) {\n          result = value;\n          lastComputed = computed;\n        }\n      });\n    }\n    return result;\n  };\n\n  // Shuffle a collection, using the modern version of the\n  // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).\n  _.shuffle = function(obj) {\n    var set = isArrayLike(obj) ? obj : _.values(obj);\n    var length = set.length;\n    var shuffled = Array(length);\n    for (var index = 0, rand; index < length; index++) {\n      rand = _.random(0, index);\n      if (rand !== index) shuffled[index] = shuffled[rand];\n      shuffled[rand] = set[index];\n    }\n    return shuffled;\n  };\n\n  // Sample **n** random values from a collection.\n  // If **n** is not specified, returns a single random element.\n  // The internal `guard` argument allows it to work with `map`.\n  _.sample = function(obj, n, guard) {\n    if (n == null || guard) {\n      if (!isArrayLike(obj)) obj = _.values(obj);\n      return obj[_.random(obj.length - 1)];\n    }\n    return _.shuffle(obj).slice(0, Math.max(0, n));\n  };\n\n  // Sort the object's values by a criterion produced by an iteratee.\n  _.sortBy = function(obj, iteratee, context) {\n    iteratee = cb(iteratee, context);\n    return _.pluck(_.map(obj, function(value, index, list) {\n      return {\n        value: value,\n        index: index,\n        criteria: iteratee(value, index, list)\n      };\n    }).sort(function(left, right) {\n      var a = left.criteria;\n      var b = right.criteria;\n      if (a !== b) {\n        if (a > b || a === void 0) return 1;\n        if (a < b || b === void 0) return -1;\n      }\n      return left.index - right.index;\n    }), 'value');\n  };\n\n  // An internal function used for aggregate \"group by\" operations.\n  var group = function(behavior) {\n    return function(obj, iteratee, context) {\n      var result = {};\n      iteratee = cb(iteratee, context);\n      _.each(obj, function(value, index) {\n        var key = iteratee(value, index, obj);\n        behavior(result, value, key);\n      });\n      return result;\n    };\n  };\n\n  // Groups the object's values by a criterion. Pass either a string attribute\n  // to group by, or a function that returns the criterion.\n  _.groupBy = group(function(result, value, key) {\n    if (_.has(result, key)) result[key].push(value); else result[key] = [value];\n  });\n\n  // Indexes the object's values by a criterion, similar to `groupBy`, but for\n  // when you know that your index values will be unique.\n  _.indexBy = group(function(result, value, key) {\n    result[key] = value;\n  });\n\n  // Counts instances of an object that group by a certain criterion. Pass\n  // either a string attribute to count by, or a function that returns the\n  // criterion.\n  _.countBy = group(function(result, value, key) {\n    if (_.has(result, key)) result[key]++; else result[key] = 1;\n  });\n\n  // Safely create a real, live array from anything iterable.\n  _.toArray = function(obj) {\n    if (!obj) return [];\n    if (_.isArray(obj)) return slice.call(obj);\n    if (isArrayLike(obj)) return _.map(obj, _.identity);\n    return _.values(obj);\n  };\n\n  // Return the number of elements in an object.\n  _.size = function(obj) {\n    if (obj == null) return 0;\n    return isArrayLike(obj) ? obj.length : _.keys(obj).length;\n  };\n\n  // Split a collection into two arrays: one whose elements all satisfy the given\n  // predicate, and one whose elements all do not satisfy the predicate.\n  _.partition = function(obj, predicate, context) {\n    predicate = cb(predicate, context);\n    var pass = [], fail = [];\n    _.each(obj, function(value, key, obj) {\n      (predicate(value, key, obj) ? pass : fail).push(value);\n    });\n    return [pass, fail];\n  };\n\n  // Array Functions\n  // ---------------\n\n  // Get the first element of an array. Passing **n** will return the first N\n  // values in the array. Aliased as `head` and `take`. The **guard** check\n  // allows it to work with `_.map`.\n  _.first = _.head = _.take = function(array, n, guard) {\n    if (array == null) return void 0;\n    if (n == null || guard) return array[0];\n    return _.initial(array, array.length - n);\n  };\n\n  // Returns everything but the last entry of the array. Especially useful on\n  // the arguments object. Passing **n** will return all the values in\n  // the array, excluding the last N.\n  _.initial = function(array, n, guard) {\n    return slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));\n  };\n\n  // Get the last element of an array. Passing **n** will return the last N\n  // values in the array.\n  _.last = function(array, n, guard) {\n    if (array == null) return void 0;\n    if (n == null || guard) return array[array.length - 1];\n    return _.rest(array, Math.max(0, array.length - n));\n  };\n\n  // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.\n  // Especially useful on the arguments object. Passing an **n** will return\n  // the rest N values in the array.\n  _.rest = _.tail = _.drop = function(array, n, guard) {\n    return slice.call(array, n == null || guard ? 1 : n);\n  };\n\n  // Trim out all falsy values from an array.\n  _.compact = function(array) {\n    return _.filter(array, _.identity);\n  };\n\n  // Internal implementation of a recursive `flatten` function.\n  var flatten = function(input, shallow, strict, startIndex) {\n    var output = [], idx = 0;\n    for (var i = startIndex || 0, length = getLength(input); i < length; i++) {\n      var value = input[i];\n      if (isArrayLike(value) && (_.isArray(value) || _.isArguments(value))) {\n        //flatten current level of array or arguments object\n        if (!shallow) value = flatten(value, shallow, strict);\n        var j = 0, len = value.length;\n        output.length += len;\n        while (j < len) {\n          output[idx++] = value[j++];\n        }\n      } else if (!strict) {\n        output[idx++] = value;\n      }\n    }\n    return output;\n  };\n\n  // Flatten out an array, either recursively (by default), or just one level.\n  _.flatten = function(array, shallow) {\n    return flatten(array, shallow, false);\n  };\n\n  // Return a version of the array that does not contain the specified value(s).\n  _.without = function(array) {\n    return _.difference(array, slice.call(arguments, 1));\n  };\n\n  // Produce a duplicate-free version of the array. If the array has already\n  // been sorted, you have the option of using a faster algorithm.\n  // Aliased as `unique`.\n  _.uniq = _.unique = function(array, isSorted, iteratee, context) {\n    if (!_.isBoolean(isSorted)) {\n      context = iteratee;\n      iteratee = isSorted;\n      isSorted = false;\n    }\n    if (iteratee != null) iteratee = cb(iteratee, context);\n    var result = [];\n    var seen = [];\n    for (var i = 0, length = getLength(array); i < length; i++) {\n      var value = array[i],\n          computed = iteratee ? iteratee(value, i, array) : value;\n      if (isSorted) {\n        if (!i || seen !== computed) result.push(value);\n        seen = computed;\n      } else if (iteratee) {\n        if (!_.contains(seen, computed)) {\n          seen.push(computed);\n          result.push(value);\n        }\n      } else if (!_.contains(result, value)) {\n        result.push(value);\n      }\n    }\n    return result;\n  };\n\n  // Produce an array that contains the union: each distinct element from all of\n  // the passed-in arrays.\n  _.union = function() {\n    return _.uniq(flatten(arguments, true, true));\n  };\n\n  // Produce an array that contains every item shared between all the\n  // passed-in arrays.\n  _.intersection = function(array) {\n    var result = [];\n    var argsLength = arguments.length;\n    for (var i = 0, length = getLength(array); i < length; i++) {\n      var item = array[i];\n      if (_.contains(result, item)) continue;\n      for (var j = 1; j < argsLength; j++) {\n        if (!_.contains(arguments[j], item)) break;\n      }\n      if (j === argsLength) result.push(item);\n    }\n    return result;\n  };\n\n  // Take the difference between one array and a number of other arrays.\n  // Only the elements present in just the first array will remain.\n  _.difference = function(array) {\n    var rest = flatten(arguments, true, true, 1);\n    return _.filter(array, function(value){\n      return !_.contains(rest, value);\n    });\n  };\n\n  // Zip together multiple lists into a single array -- elements that share\n  // an index go together.\n  _.zip = function() {\n    return _.unzip(arguments);\n  };\n\n  // Complement of _.zip. Unzip accepts an array of arrays and groups\n  // each array's elements on shared indices\n  _.unzip = function(array) {\n    var length = array && _.max(array, getLength).length || 0;\n    var result = Array(length);\n\n    for (var index = 0; index < length; index++) {\n      result[index] = _.pluck(array, index);\n    }\n    return result;\n  };\n\n  // Converts lists into objects. Pass either a single array of `[key, value]`\n  // pairs, or two parallel arrays of the same length -- one of keys, and one of\n  // the corresponding values.\n  _.object = function(list, values) {\n    var result = {};\n    for (var i = 0, length = getLength(list); i < length; i++) {\n      if (values) {\n        result[list[i]] = values[i];\n      } else {\n        result[list[i][0]] = list[i][1];\n      }\n    }\n    return result;\n  };\n\n  // Generator function to create the findIndex and findLastIndex functions\n  function createPredicateIndexFinder(dir) {\n    return function(array, predicate, context) {\n      predicate = cb(predicate, context);\n      var length = getLength(array);\n      var index = dir > 0 ? 0 : length - 1;\n      for (; index >= 0 && index < length; index += dir) {\n        if (predicate(array[index], index, array)) return index;\n      }\n      return -1;\n    };\n  }\n\n  // Returns the first index on an array-like that passes a predicate test\n  _.findIndex = createPredicateIndexFinder(1);\n  _.findLastIndex = createPredicateIndexFinder(-1);\n\n  // Use a comparator function to figure out the smallest index at which\n  // an object should be inserted so as to maintain order. Uses binary search.\n  _.sortedIndex = function(array, obj, iteratee, context) {\n    iteratee = cb(iteratee, context, 1);\n    var value = iteratee(obj);\n    var low = 0, high = getLength(array);\n    while (low < high) {\n      var mid = Math.floor((low + high) / 2);\n      if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;\n    }\n    return low;\n  };\n\n  // Generator function to create the indexOf and lastIndexOf functions\n  function createIndexFinder(dir, predicateFind, sortedIndex) {\n    return function(array, item, idx) {\n      var i = 0, length = getLength(array);\n      if (typeof idx == 'number') {\n        if (dir > 0) {\n            i = idx >= 0 ? idx : Math.max(idx + length, i);\n        } else {\n            length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;\n        }\n      } else if (sortedIndex && idx && length) {\n        idx = sortedIndex(array, item);\n        return array[idx] === item ? idx : -1;\n      }\n      if (item !== item) {\n        idx = predicateFind(slice.call(array, i, length), _.isNaN);\n        return idx >= 0 ? idx + i : -1;\n      }\n      for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {\n        if (array[idx] === item) return idx;\n      }\n      return -1;\n    };\n  }\n\n  // Return the position of the first occurrence of an item in an array,\n  // or -1 if the item is not included in the array.\n  // If the array is large and already in sort order, pass `true`\n  // for **isSorted** to use binary search.\n  _.indexOf = createIndexFinder(1, _.findIndex, _.sortedIndex);\n  _.lastIndexOf = createIndexFinder(-1, _.findLastIndex);\n\n  // Generate an integer Array containing an arithmetic progression. A port of\n  // the native Python `range()` function. See\n  // [the Python documentation](http://docs.python.org/library/functions.html#range).\n  _.range = function(start, stop, step) {\n    if (stop == null) {\n      stop = start || 0;\n      start = 0;\n    }\n    step = step || 1;\n\n    var length = Math.max(Math.ceil((stop - start) / step), 0);\n    var range = Array(length);\n\n    for (var idx = 0; idx < length; idx++, start += step) {\n      range[idx] = start;\n    }\n\n    return range;\n  };\n\n  // Function (ahem) Functions\n  // ------------------\n\n  // Determines whether to execute a function as a constructor\n  // or a normal function with the provided arguments\n  var executeBound = function(sourceFunc, boundFunc, context, callingContext, args) {\n    if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);\n    var self = baseCreate(sourceFunc.prototype);\n    var result = sourceFunc.apply(self, args);\n    if (_.isObject(result)) return result;\n    return self;\n  };\n\n  // Create a function bound to a given object (assigning `this`, and arguments,\n  // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if\n  // available.\n  _.bind = function(func, context) {\n    if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));\n    if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function');\n    var args = slice.call(arguments, 2);\n    var bound = function() {\n      return executeBound(func, bound, context, this, args.concat(slice.call(arguments)));\n    };\n    return bound;\n  };\n\n  // Partially apply a function by creating a version that has had some of its\n  // arguments pre-filled, without changing its dynamic `this` context. _ acts\n  // as a placeholder, allowing any combination of arguments to be pre-filled.\n  _.partial = function(func) {\n    var boundArgs = slice.call(arguments, 1);\n    var bound = function() {\n      var position = 0, length = boundArgs.length;\n      var args = Array(length);\n      for (var i = 0; i < length; i++) {\n        args[i] = boundArgs[i] === _ ? arguments[position++] : boundArgs[i];\n      }\n      while (position < arguments.length) args.push(arguments[position++]);\n      return executeBound(func, bound, this, this, args);\n    };\n    return bound;\n  };\n\n  // Bind a number of an object's methods to that object. Remaining arguments\n  // are the method names to be bound. Useful for ensuring that all callbacks\n  // defined on an object belong to it.\n  _.bindAll = function(obj) {\n    var i, length = arguments.length, key;\n    if (length <= 1) throw new Error('bindAll must be passed function names');\n    for (i = 1; i < length; i++) {\n      key = arguments[i];\n      obj[key] = _.bind(obj[key], obj);\n    }\n    return obj;\n  };\n\n  // Memoize an expensive function by storing its results.\n  _.memoize = function(func, hasher) {\n    var memoize = function(key) {\n      var cache = memoize.cache;\n      var address = '' + (hasher ? hasher.apply(this, arguments) : key);\n      if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);\n      return cache[address];\n    };\n    memoize.cache = {};\n    return memoize;\n  };\n\n  // Delays a function for the given number of milliseconds, and then calls\n  // it with the arguments supplied.\n  _.delay = function(func, wait) {\n    var args = slice.call(arguments, 2);\n    return setTimeout(function(){\n      return func.apply(null, args);\n    }, wait);\n  };\n\n  // Defers a function, scheduling it to run after the current call stack has\n  // cleared.\n  _.defer = _.partial(_.delay, _, 1);\n\n  // Returns a function, that, when invoked, will only be triggered at most once\n  // during a given window of time. Normally, the throttled function will run\n  // as much as it can, without ever going more than once per `wait` duration;\n  // but if you'd like to disable the execution on the leading edge, pass\n  // `{leading: false}`. To disable execution on the trailing edge, ditto.\n  _.throttle = function(func, wait, options) {\n    var context, args, result;\n    var timeout = null;\n    var previous = 0;\n    if (!options) options = {};\n    var later = function() {\n      previous = options.leading === false ? 0 : _.now();\n      timeout = null;\n      result = func.apply(context, args);\n      if (!timeout) context = args = null;\n    };\n    return function() {\n      var now = _.now();\n      if (!previous && options.leading === false) previous = now;\n      var remaining = wait - (now - previous);\n      context = this;\n      args = arguments;\n      if (remaining <= 0 || remaining > wait) {\n        if (timeout) {\n          clearTimeout(timeout);\n          timeout = null;\n        }\n        previous = now;\n        result = func.apply(context, args);\n        if (!timeout) context = args = null;\n      } else if (!timeout && options.trailing !== false) {\n        timeout = setTimeout(later, remaining);\n      }\n      return result;\n    };\n  };\n\n  // Returns a function, that, as long as it continues to be invoked, will not\n  // be triggered. The function will be called after it stops being called for\n  // N milliseconds. If `immediate` is passed, trigger the function on the\n  // leading edge, instead of the trailing.\n  _.debounce = function(func, wait, immediate) {\n    var timeout, args, context, timestamp, result;\n\n    var later = function() {\n      var last = _.now() - timestamp;\n\n      if (last < wait && last >= 0) {\n        timeout = setTimeout(later, wait - last);\n      } else {\n        timeout = null;\n        if (!immediate) {\n          result = func.apply(context, args);\n          if (!timeout) context = args = null;\n        }\n      }\n    };\n\n    return function() {\n      context = this;\n      args = arguments;\n      timestamp = _.now();\n      var callNow = immediate && !timeout;\n      if (!timeout) timeout = setTimeout(later, wait);\n      if (callNow) {\n        result = func.apply(context, args);\n        context = args = null;\n      }\n\n      return result;\n    };\n  };\n\n  // Returns the first function passed as an argument to the second,\n  // allowing you to adjust arguments, run code before and after, and\n  // conditionally execute the original function.\n  _.wrap = function(func, wrapper) {\n    return _.partial(wrapper, func);\n  };\n\n  // Returns a negated version of the passed-in predicate.\n  _.negate = function(predicate) {\n    return function() {\n      return !predicate.apply(this, arguments);\n    };\n  };\n\n  // Returns a function that is the composition of a list of functions, each\n  // consuming the return value of the function that follows.\n  _.compose = function() {\n    var args = arguments;\n    var start = args.length - 1;\n    return function() {\n      var i = start;\n      var result = args[start].apply(this, arguments);\n      while (i--) result = args[i].call(this, result);\n      return result;\n    };\n  };\n\n  // Returns a function that will only be executed on and after the Nth call.\n  _.after = function(times, func) {\n    return function() {\n      if (--times < 1) {\n        return func.apply(this, arguments);\n      }\n    };\n  };\n\n  // Returns a function that will only be executed up to (but not including) the Nth call.\n  _.before = function(times, func) {\n    var memo;\n    return function() {\n      if (--times > 0) {\n        memo = func.apply(this, arguments);\n      }\n      if (times <= 1) func = null;\n      return memo;\n    };\n  };\n\n  // Returns a function that will be executed at most one time, no matter how\n  // often you call it. Useful for lazy initialization.\n  _.once = _.partial(_.before, 2);\n\n  // Object Functions\n  // ----------------\n\n  // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.\n  var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');\n  var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',\n                      'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];\n\n  function collectNonEnumProps(obj, keys) {\n    var nonEnumIdx = nonEnumerableProps.length;\n    var constructor = obj.constructor;\n    var proto = (_.isFunction(constructor) && constructor.prototype) || ObjProto;\n\n    // Constructor is a special case.\n    var prop = 'constructor';\n    if (_.has(obj, prop) && !_.contains(keys, prop)) keys.push(prop);\n\n    while (nonEnumIdx--) {\n      prop = nonEnumerableProps[nonEnumIdx];\n      if (prop in obj && obj[prop] !== proto[prop] && !_.contains(keys, prop)) {\n        keys.push(prop);\n      }\n    }\n  }\n\n  // Retrieve the names of an object's own properties.\n  // Delegates to **ECMAScript 5**'s native `Object.keys`\n  _.keys = function(obj) {\n    if (!_.isObject(obj)) return [];\n    if (nativeKeys) return nativeKeys(obj);\n    var keys = [];\n    for (var key in obj) if (_.has(obj, key)) keys.push(key);\n    // Ahem, IE < 9.\n    if (hasEnumBug) collectNonEnumProps(obj, keys);\n    return keys;\n  };\n\n  // Retrieve all the property names of an object.\n  _.allKeys = function(obj) {\n    if (!_.isObject(obj)) return [];\n    var keys = [];\n    for (var key in obj) keys.push(key);\n    // Ahem, IE < 9.\n    if (hasEnumBug) collectNonEnumProps(obj, keys);\n    return keys;\n  };\n\n  // Retrieve the values of an object's properties.\n  _.values = function(obj) {\n    var keys = _.keys(obj);\n    var length = keys.length;\n    var values = Array(length);\n    for (var i = 0; i < length; i++) {\n      values[i] = obj[keys[i]];\n    }\n    return values;\n  };\n\n  // Returns the results of applying the iteratee to each element of the object\n  // In contrast to _.map it returns an object\n  _.mapObject = function(obj, iteratee, context) {\n    iteratee = cb(iteratee, context);\n    var keys =  _.keys(obj),\n          length = keys.length,\n          results = {},\n          currentKey;\n      for (var index = 0; index < length; index++) {\n        currentKey = keys[index];\n        results[currentKey] = iteratee(obj[currentKey], currentKey, obj);\n      }\n      return results;\n  };\n\n  // Convert an object into a list of `[key, value]` pairs.\n  _.pairs = function(obj) {\n    var keys = _.keys(obj);\n    var length = keys.length;\n    var pairs = Array(length);\n    for (var i = 0; i < length; i++) {\n      pairs[i] = [keys[i], obj[keys[i]]];\n    }\n    return pairs;\n  };\n\n  // Invert the keys and values of an object. The values must be serializable.\n  _.invert = function(obj) {\n    var result = {};\n    var keys = _.keys(obj);\n    for (var i = 0, length = keys.length; i < length; i++) {\n      result[obj[keys[i]]] = keys[i];\n    }\n    return result;\n  };\n\n  // Return a sorted list of the function names available on the object.\n  // Aliased as `methods`\n  _.functions = _.methods = function(obj) {\n    var names = [];\n    for (var key in obj) {\n      if (_.isFunction(obj[key])) names.push(key);\n    }\n    return names.sort();\n  };\n\n  // Extend a given object with all the properties in passed-in object(s).\n  _.extend = createAssigner(_.allKeys);\n\n  // Assigns a given object with all the own properties in the passed-in object(s)\n  // (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)\n  _.extendOwn = _.assign = createAssigner(_.keys);\n\n  // Returns the first key on an object that passes a predicate test\n  _.findKey = function(obj, predicate, context) {\n    predicate = cb(predicate, context);\n    var keys = _.keys(obj), key;\n    for (var i = 0, length = keys.length; i < length; i++) {\n      key = keys[i];\n      if (predicate(obj[key], key, obj)) return key;\n    }\n  };\n\n  // Return a copy of the object only containing the whitelisted properties.\n  _.pick = function(object, oiteratee, context) {\n    var result = {}, obj = object, iteratee, keys;\n    if (obj == null) return result;\n    if (_.isFunction(oiteratee)) {\n      keys = _.allKeys(obj);\n      iteratee = optimizeCb(oiteratee, context);\n    } else {\n      keys = flatten(arguments, false, false, 1);\n      iteratee = function(value, key, obj) { return key in obj; };\n      obj = Object(obj);\n    }\n    for (var i = 0, length = keys.length; i < length; i++) {\n      var key = keys[i];\n      var value = obj[key];\n      if (iteratee(value, key, obj)) result[key] = value;\n    }\n    return result;\n  };\n\n   // Return a copy of the object without the blacklisted properties.\n  _.omit = function(obj, iteratee, context) {\n    if (_.isFunction(iteratee)) {\n      iteratee = _.negate(iteratee);\n    } else {\n      var keys = _.map(flatten(arguments, false, false, 1), String);\n      iteratee = function(value, key) {\n        return !_.contains(keys, key);\n      };\n    }\n    return _.pick(obj, iteratee, context);\n  };\n\n  // Fill in a given object with default properties.\n  _.defaults = createAssigner(_.allKeys, true);\n\n  // Creates an object that inherits from the given prototype object.\n  // If additional properties are provided then they will be added to the\n  // created object.\n  _.create = function(prototype, props) {\n    var result = baseCreate(prototype);\n    if (props) _.extendOwn(result, props);\n    return result;\n  };\n\n  // Create a (shallow-cloned) duplicate of an object.\n  _.clone = function(obj) {\n    if (!_.isObject(obj)) return obj;\n    return _.isArray(obj) ? obj.slice() : _.extend({}, obj);\n  };\n\n  // Invokes interceptor with the obj, and then returns obj.\n  // The primary purpose of this method is to \"tap into\" a method chain, in\n  // order to perform operations on intermediate results within the chain.\n  _.tap = function(obj, interceptor) {\n    interceptor(obj);\n    return obj;\n  };\n\n  // Returns whether an object has a given set of `key:value` pairs.\n  _.isMatch = function(object, attrs) {\n    var keys = _.keys(attrs), length = keys.length;\n    if (object == null) return !length;\n    var obj = Object(object);\n    for (var i = 0; i < length; i++) {\n      var key = keys[i];\n      if (attrs[key] !== obj[key] || !(key in obj)) return false;\n    }\n    return true;\n  };\n\n\n  // Internal recursive comparison function for `isEqual`.\n  var eq = function(a, b, aStack, bStack) {\n    // Identical objects are equal. `0 === -0`, but they aren't identical.\n    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).\n    if (a === b) return a !== 0 || 1 / a === 1 / b;\n    // A strict comparison is necessary because `null == undefined`.\n    if (a == null || b == null) return a === b;\n    // Unwrap any wrapped objects.\n    if (a instanceof _) a = a._wrapped;\n    if (b instanceof _) b = b._wrapped;\n    // Compare `[[Class]]` names.\n    var className = toString.call(a);\n    if (className !== toString.call(b)) return false;\n    switch (className) {\n      // Strings, numbers, regular expressions, dates, and booleans are compared by value.\n      case '[object RegExp]':\n      // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')\n      case '[object String]':\n        // Primitives and their corresponding object wrappers are equivalent; thus, `\"5\"` is\n        // equivalent to `new String(\"5\")`.\n        return '' + a === '' + b;\n      case '[object Number]':\n        // `NaN`s are equivalent, but non-reflexive.\n        // Object(NaN) is equivalent to NaN\n        if (+a !== +a) return +b !== +b;\n        // An `egal` comparison is performed for other numeric values.\n        return +a === 0 ? 1 / +a === 1 / b : +a === +b;\n      case '[object Date]':\n      case '[object Boolean]':\n        // Coerce dates and booleans to numeric primitive values. Dates are compared by their\n        // millisecond representations. Note that invalid dates with millisecond representations\n        // of `NaN` are not equivalent.\n        return +a === +b;\n    }\n\n    var areArrays = className === '[object Array]';\n    if (!areArrays) {\n      if (typeof a != 'object' || typeof b != 'object') return false;\n\n      // Objects with different constructors are not equivalent, but `Object`s or `Array`s\n      // from different frames are.\n      var aCtor = a.constructor, bCtor = b.constructor;\n      if (aCtor !== bCtor && !(_.isFunction(aCtor) && aCtor instanceof aCtor &&\n                               _.isFunction(bCtor) && bCtor instanceof bCtor)\n                          && ('constructor' in a && 'constructor' in b)) {\n        return false;\n      }\n    }\n    // Assume equality for cyclic structures. The algorithm for detecting cyclic\n    // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.\n\n    // Initializing stack of traversed objects.\n    // It's done here since we only need them for objects and arrays comparison.\n    aStack = aStack || [];\n    bStack = bStack || [];\n    var length = aStack.length;\n    while (length--) {\n      // Linear search. Performance is inversely proportional to the number of\n      // unique nested structures.\n      if (aStack[length] === a) return bStack[length] === b;\n    }\n\n    // Add the first object to the stack of traversed objects.\n    aStack.push(a);\n    bStack.push(b);\n\n    // Recursively compare objects and arrays.\n    if (areArrays) {\n      // Compare array lengths to determine if a deep comparison is necessary.\n      length = a.length;\n      if (length !== b.length) return false;\n      // Deep compare the contents, ignoring non-numeric properties.\n      while (length--) {\n        if (!eq(a[length], b[length], aStack, bStack)) return false;\n      }\n    } else {\n      // Deep compare objects.\n      var keys = _.keys(a), key;\n      length = keys.length;\n      // Ensure that both objects contain the same number of properties before comparing deep equality.\n      if (_.keys(b).length !== length) return false;\n      while (length--) {\n        // Deep compare each member\n        key = keys[length];\n        if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;\n      }\n    }\n    // Remove the first object from the stack of traversed objects.\n    aStack.pop();\n    bStack.pop();\n    return true;\n  };\n\n  // Perform a deep comparison to check if two objects are equal.\n  _.isEqual = function(a, b) {\n    return eq(a, b);\n  };\n\n  // Is a given array, string, or object empty?\n  // An \"empty\" object has no enumerable own-properties.\n  _.isEmpty = function(obj) {\n    if (obj == null) return true;\n    if (isArrayLike(obj) && (_.isArray(obj) || _.isString(obj) || _.isArguments(obj))) return obj.length === 0;\n    return _.keys(obj).length === 0;\n  };\n\n  // Is a given value a DOM element?\n  _.isElement = function(obj) {\n    return !!(obj && obj.nodeType === 1);\n  };\n\n  // Is a given value an array?\n  // Delegates to ECMA5's native Array.isArray\n  _.isArray = nativeIsArray || function(obj) {\n    return toString.call(obj) === '[object Array]';\n  };\n\n  // Is a given variable an object?\n  _.isObject = function(obj) {\n    var type = typeof obj;\n    return type === 'function' || type === 'object' && !!obj;\n  };\n\n  // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.\n  _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error'], function(name) {\n    _['is' + name] = function(obj) {\n      return toString.call(obj) === '[object ' + name + ']';\n    };\n  });\n\n  // Define a fallback version of the method in browsers (ahem, IE < 9), where\n  // there isn't any inspectable \"Arguments\" type.\n  if (!_.isArguments(arguments)) {\n    _.isArguments = function(obj) {\n      return _.has(obj, 'callee');\n    };\n  }\n\n  // Optimize `isFunction` if appropriate. Work around some typeof bugs in old v8,\n  // IE 11 (#1621), and in Safari 8 (#1929).\n  if (typeof /./ != 'function' && typeof Int8Array != 'object') {\n    _.isFunction = function(obj) {\n      return typeof obj == 'function' || false;\n    };\n  }\n\n  // Is a given object a finite number?\n  _.isFinite = function(obj) {\n    return isFinite(obj) && !isNaN(parseFloat(obj));\n  };\n\n  // Is the given value `NaN`? (NaN is the only number which does not equal itself).\n  _.isNaN = function(obj) {\n    return _.isNumber(obj) && obj !== +obj;\n  };\n\n  // Is a given value a boolean?\n  _.isBoolean = function(obj) {\n    return obj === true || obj === false || toString.call(obj) === '[object Boolean]';\n  };\n\n  // Is a given value equal to null?\n  _.isNull = function(obj) {\n    return obj === null;\n  };\n\n  // Is a given variable undefined?\n  _.isUndefined = function(obj) {\n    return obj === void 0;\n  };\n\n  // Shortcut function for checking if an object has a given property directly\n  // on itself (in other words, not on a prototype).\n  _.has = function(obj, key) {\n    return obj != null && hasOwnProperty.call(obj, key);\n  };\n\n  // Utility Functions\n  // -----------------\n\n  // Run Underscore.js in *noConflict* mode, returning the `_` variable to its\n  // previous owner. Returns a reference to the Underscore object.\n  _.noConflict = function() {\n    root._ = previousUnderscore;\n    return this;\n  };\n\n  // Keep the identity function around for default iteratees.\n  _.identity = function(value) {\n    return value;\n  };\n\n  // Predicate-generating functions. Often useful outside of Underscore.\n  _.constant = function(value) {\n    return function() {\n      return value;\n    };\n  };\n\n  _.noop = function(){};\n\n  _.property = property;\n\n  // Generates a function for a given object that returns a given property.\n  _.propertyOf = function(obj) {\n    return obj == null ? function(){} : function(key) {\n      return obj[key];\n    };\n  };\n\n  // Returns a predicate for checking whether an object has a given set of\n  // `key:value` pairs.\n  _.matcher = _.matches = function(attrs) {\n    attrs = _.extendOwn({}, attrs);\n    return function(obj) {\n      return _.isMatch(obj, attrs);\n    };\n  };\n\n  // Run a function **n** times.\n  _.times = function(n, iteratee, context) {\n    var accum = Array(Math.max(0, n));\n    iteratee = optimizeCb(iteratee, context, 1);\n    for (var i = 0; i < n; i++) accum[i] = iteratee(i);\n    return accum;\n  };\n\n  // Return a random integer between min and max (inclusive).\n  _.random = function(min, max) {\n    if (max == null) {\n      max = min;\n      min = 0;\n    }\n    return min + Math.floor(Math.random() * (max - min + 1));\n  };\n\n  // A (possibly faster) way to get the current timestamp as an integer.\n  _.now = Date.now || function() {\n    return new Date().getTime();\n  };\n\n   // List of HTML entities for escaping.\n  var escapeMap = {\n    '&': '&amp;',\n    '<': '&lt;',\n    '>': '&gt;',\n    '\"': '&quot;',\n    \"'\": '&#x27;',\n    '`': '&#x60;'\n  };\n  var unescapeMap = _.invert(escapeMap);\n\n  // Functions for escaping and unescaping strings to/from HTML interpolation.\n  var createEscaper = function(map) {\n    var escaper = function(match) {\n      return map[match];\n    };\n    // Regexes for identifying a key that needs to be escaped\n    var source = '(?:' + _.keys(map).join('|') + ')';\n    var testRegexp = RegExp(source);\n    var replaceRegexp = RegExp(source, 'g');\n    return function(string) {\n      string = string == null ? '' : '' + string;\n      return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;\n    };\n  };\n  _.escape = createEscaper(escapeMap);\n  _.unescape = createEscaper(unescapeMap);\n\n  // If the value of the named `property` is a function then invoke it with the\n  // `object` as context; otherwise, return it.\n  _.result = function(object, property, fallback) {\n    var value = object == null ? void 0 : object[property];\n    if (value === void 0) {\n      value = fallback;\n    }\n    return _.isFunction(value) ? value.call(object) : value;\n  };\n\n  // Generate a unique integer id (unique within the entire client session).\n  // Useful for temporary DOM ids.\n  var idCounter = 0;\n  _.uniqueId = function(prefix) {\n    var id = ++idCounter + '';\n    return prefix ? prefix + id : id;\n  };\n\n  // By default, Underscore uses ERB-style template delimiters, change the\n  // following template settings to use alternative delimiters.\n  _.templateSettings = {\n    evaluate    : /<%([\\s\\S]+?)%>/g,\n    interpolate : /<%=([\\s\\S]+?)%>/g,\n    escape      : /<%-([\\s\\S]+?)%>/g\n  };\n\n  // When customizing `templateSettings`, if you don't want to define an\n  // interpolation, evaluation or escaping regex, we need one that is\n  // guaranteed not to match.\n  var noMatch = /(.)^/;\n\n  // Certain characters need to be escaped so that they can be put into a\n  // string literal.\n  var escapes = {\n    \"'\":      \"'\",\n    '\\\\':     '\\\\',\n    '\\r':     'r',\n    '\\n':     'n',\n    '\\u2028': 'u2028',\n    '\\u2029': 'u2029'\n  };\n\n  var escaper = /\\\\|'|\\r|\\n|\\u2028|\\u2029/g;\n\n  var escapeChar = function(match) {\n    return '\\\\' + escapes[match];\n  };\n\n  // JavaScript micro-templating, similar to John Resig's implementation.\n  // Underscore templating handles arbitrary delimiters, preserves whitespace,\n  // and correctly escapes quotes within interpolated code.\n  // NB: `oldSettings` only exists for backwards compatibility.\n  _.template = function(text, settings, oldSettings) {\n    if (!settings && oldSettings) settings = oldSettings;\n    settings = _.defaults({}, settings, _.templateSettings);\n\n    // Combine delimiters into one regular expression via alternation.\n    var matcher = RegExp([\n      (settings.escape || noMatch).source,\n      (settings.interpolate || noMatch).source,\n      (settings.evaluate || noMatch).source\n    ].join('|') + '|$', 'g');\n\n    // Compile the template source, escaping string literals appropriately.\n    var index = 0;\n    var source = \"__p+='\";\n    text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {\n      source += text.slice(index, offset).replace(escaper, escapeChar);\n      index = offset + match.length;\n\n      if (escape) {\n        source += \"'+\\n((__t=(\" + escape + \"))==null?'':_.escape(__t))+\\n'\";\n      } else if (interpolate) {\n        source += \"'+\\n((__t=(\" + interpolate + \"))==null?'':__t)+\\n'\";\n      } else if (evaluate) {\n        source += \"';\\n\" + evaluate + \"\\n__p+='\";\n      }\n\n      // Adobe VMs need the match returned to produce the correct offest.\n      return match;\n    });\n    source += \"';\\n\";\n\n    // If a variable is not specified, place data values in local scope.\n    if (!settings.variable) source = 'with(obj||{}){\\n' + source + '}\\n';\n\n    source = \"var __t,__p='',__j=Array.prototype.join,\" +\n      \"print=function(){__p+=__j.call(arguments,'');};\\n\" +\n      source + 'return __p;\\n';\n\n    try {\n      var render = new Function(settings.variable || 'obj', '_', source);\n    } catch (e) {\n      e.source = source;\n      throw e;\n    }\n\n    var template = function(data) {\n      return render.call(this, data, _);\n    };\n\n    // Provide the compiled source as a convenience for precompilation.\n    var argument = settings.variable || 'obj';\n    template.source = 'function(' + argument + '){\\n' + source + '}';\n\n    return template;\n  };\n\n  // Add a \"chain\" function. Start chaining a wrapped Underscore object.\n  _.chain = function(obj) {\n    var instance = _(obj);\n    instance._chain = true;\n    return instance;\n  };\n\n  // OOP\n  // ---------------\n  // If Underscore is called as a function, it returns a wrapped object that\n  // can be used OO-style. This wrapper holds altered versions of all the\n  // underscore functions. Wrapped objects may be chained.\n\n  // Helper function to continue chaining intermediate results.\n  var result = function(instance, obj) {\n    return instance._chain ? _(obj).chain() : obj;\n  };\n\n  // Add your own custom functions to the Underscore object.\n  _.mixin = function(obj) {\n    _.each(_.functions(obj), function(name) {\n      var func = _[name] = obj[name];\n      _.prototype[name] = function() {\n        var args = [this._wrapped];\n        push.apply(args, arguments);\n        return result(this, func.apply(_, args));\n      };\n    });\n  };\n\n  // Add all of the Underscore functions to the wrapper object.\n  _.mixin(_);\n\n  // Add all mutator Array functions to the wrapper.\n  _.each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {\n    var method = ArrayProto[name];\n    _.prototype[name] = function() {\n      var obj = this._wrapped;\n      method.apply(obj, arguments);\n      if ((name === 'shift' || name === 'splice') && obj.length === 0) delete obj[0];\n      return result(this, obj);\n    };\n  });\n\n  // Add all accessor Array functions to the wrapper.\n  _.each(['concat', 'join', 'slice'], function(name) {\n    var method = ArrayProto[name];\n    _.prototype[name] = function() {\n      return result(this, method.apply(this._wrapped, arguments));\n    };\n  });\n\n  // Extracts the result from a wrapped and chained object.\n  _.prototype.value = function() {\n    return this._wrapped;\n  };\n\n  // Provide unwrapping proxy for some methods used in engine operations\n  // such as arithmetic and JSON stringification.\n  _.prototype.valueOf = _.prototype.toJSON = _.prototype.value;\n\n  _.prototype.toString = function() {\n    return '' + this._wrapped;\n  };\n\n  // AMD registration happens at the end for compatibility with AMD loaders\n  // that may not enforce next-turn semantics on modules. Even though general\n  // practice for AMD registration is to be anonymous, underscore registers\n  // as a named module because, like jQuery, it is a base library that is\n  // popular enough to be bundled in a third party lib, but not be part of\n  // an AMD load request. Those cases could generate an error when an\n  // anonymous define() is called outside of a loader request.\n  if (typeof define === 'function' && define.amd) {\n    define('underscore', [], function() {\n      return _;\n    });\n  }\n}.call(this));\n","var bundleFn = arguments[3];\nvar sources = arguments[4];\nvar cache = arguments[5];\n\nvar stringify = JSON.stringify;\n\nmodule.exports = function (fn) {\n    var keys = [];\n    var wkey;\n    var cacheKeys = Object.keys(cache);\n\n    for (var i = 0, l = cacheKeys.length; i < l; i++) {\n        var key = cacheKeys[i];\n        var exp = cache[key].exports;\n        // Using babel as a transpiler to use esmodule, the export will always\n        // be an object with the default export as a property of it. To ensure\n        // the existing api and babel esmodule exports are both supported we\n        // check for both\n        if (exp === fn || exp.default === fn) {\n            wkey = key;\n            break;\n        }\n    }\n\n    if (!wkey) {\n        wkey = Math.floor(Math.pow(16, 8) * Math.random()).toString(16);\n        var wcache = {};\n        for (var i = 0, l = cacheKeys.length; i < l; i++) {\n            var key = cacheKeys[i];\n            wcache[key] = key;\n        }\n        sources[wkey] = [\n            Function(['require','module','exports'], '(' + fn + ')(self)'),\n            wcache\n        ];\n    }\n    var skey = Math.floor(Math.pow(16, 8) * Math.random()).toString(16);\n\n    var scache = {}; scache[wkey] = wkey;\n    sources[skey] = [\n        Function(['require'], (\n            // try to call default if defined to also support babel esmodule\n            // exports\n            'var f = require(' + stringify(wkey) + ');' +\n            '(f.default ? f.default : f)(self);'\n        )),\n        scache\n    ];\n\n    var src = '(' + bundleFn + ')({'\n        + Object.keys(sources).map(function (key) {\n            return stringify(key) + ':['\n                + sources[key][0]\n                + ',' + stringify(sources[key][1]) + ']'\n            ;\n        }).join(',')\n        + '},{},[' + stringify(skey) + '])'\n    ;\n\n    var URL = window.URL || window.webkitURL || window.mozURL || window.msURL;\n\n    return new Worker(URL.createObjectURL(\n        new Blob([src], { type: 'text/javascript' })\n    ));\n};\n","'use strict';\r\n\r\nvar Graph = require('ngraph.graph');\r\nvar _ = require('underscore');\r\nvar Q = require('Q');\r\nvar Nlayout = require('ngraph.asyncforce');\r\n// registers the extension on a cytoscape lib ref\r\n\r\nvar ngraph = function (cytoscape) {\r\n\r\n    if (!cytoscape) {\r\n        return;\r\n    } // can't register if cytoscape unspecified\r\n\r\n    var defaults = {\r\n        async: {\r\n            // tell layout that we want to compute all at once:\r\n            maxIterations: 1000,\r\n            stepsPerCycle: 30,\r\n\r\n            // Run it till the end:\r\n            waitForStep: false\r\n        },\r\n        physics: {\r\n            /**\r\n             * Ideal length for links (springs in physical model).\r\n             */\r\n            springLength: 100,\r\n\r\n            /**\r\n             * Hook's law coefficient. 1 - solid spring.\r\n             */\r\n            springCoeff: 0.0008,\r\n\r\n            /**\r\n             * Coulomb's law coefficient. It's used to repel nodes thus should be negative\r\n             * if you make it positive nodes start attract each other :).\r\n             */\r\n            gravity: -1.2,\r\n\r\n            /**\r\n             * Theta coefficient from Barnes Hut simulation. Ranged between (0, 1).\r\n             * The closer it's to 1 the more nodes algorithm will have to go through.\r\n             * Setting it to one makes Barnes Hut simulation no different from\r\n             * brute-force forces calculation (each node is considered).\r\n             */\r\n            theta: 0.8,\r\n\r\n            /**\r\n             * Drag force coefficient. Used to slow down system, thus should be less than 1.\r\n             * The closer it is to 0 the less tight system will be.\r\n             */\r\n            dragCoeff: 0.02,\r\n\r\n            /**\r\n             * Default time step (dt) for forces integration\r\n             */\r\n            timeStep: 20,\r\n            iterations: 10000,\r\n            fit: true,\r\n\r\n            /**\r\n             * Maximum movement of the system which can be considered as stabilized\r\n             */\r\n            stableThreshold: 0.000009\r\n        },\r\n        iterations: 10000,\r\n        refreshInterval: 16, // in ms\r\n        refreshIterations: 10, // iterations until thread sends an update\r\n        stableThreshold: 2,\r\n        animate: true,\r\n        fit: true\r\n    };\r\n\r\n    var extend = Object.assign || function (tgt) {\r\n        for (var i = 1; i < arguments.length; i++) {\r\n            var obj = arguments[i];\r\n\r\n            for (var k in obj) {\r\n                tgt[k] = obj[k];\r\n            }\r\n        }\r\n        return tgt;\r\n    };\r\n\r\n    function Layout(options) {\r\n        this.options = extend({}, defaults, options);\r\n        this.layoutOptions = extend({}, defaults, options);\r\n        delete this.layoutOptions.cy;\r\n        delete this.layoutOptions.eles;\r\n    }\r\n\r\n    Layout.prototype.l = Nlayout;\r\n    Layout.prototype.g = Graph;\r\n\r\n    Layout.prototype.run = function () {\r\n        var layout = this;\r\n        layout.trigger({ type: 'layoutstart', layout: layout });\r\n        var options = this.options;\r\n        var layoutOptions = this.layoutOptions;\r\n        var that = this;\r\n        var graph = that.g();\r\n        var cy = options.cy;\r\n        var eles = options.eles;\r\n        var nodes = eles.nodes();\r\n        var parents = nodes.parents();\r\n\r\n        // FILTER\r\n\r\n        nodes = nodes.difference(parents);\r\n\r\n        nodes = nodes.filterFn(function (ele) {\r\n            return ele.connectedEdges().length > 0\r\n        });\r\n\r\n        var edges = eles.edges();\r\n        var edgesHash = {};\r\n        var L;\r\n\r\n\r\n        var firstUpdate = true;\r\n\r\n        /*        if (eles.length > 3000) {\r\n         options.iterations = options.iterations - Math.abs(options.iterations / 3); // reduce iterations for big graph\r\n         }*/\r\n\r\n        var update = function (nodesJson) {\r\n            /* cy.batch(function () {\r\n             nodesJson.forEach(function(e,k){\r\n             nodes.$('#'+ e.data.id).position(e.position);\r\n             })\r\n\r\n             });*/\r\n            nodes.positions(function (i, node) {\r\n                if (typeof i != 'number') {\r\n                    node = i;\r\n                }\r\n                if (!node.data('dragging'))\r\n                    return L.getNodePosition(node.id())\r\n            });\r\n\r\n            // if (layoutOptions.async) {\r\n            //     setTimeout(function () {\r\n            //         layout.trigger({ type: 'layoutstop', layout: layout });\r\n            //         layout.trigger({ type: 'layoutready', layout: layout });\r\n            //     }, 500);\r\n            // }\r\n\r\n            /* nodes.forEach(function (node) {\r\n             L.getNodePosition(node.id())\r\n             });*/\r\n\r\n            // maybe we fit each iteration\r\n            if (layoutOptions.fit) {\r\n                cy.fit(layoutOptions.padding);\r\n            }\r\n\r\n            if (firstUpdate) {\r\n                // indicate the initial positions have been set\r\n                layout.trigger('layoutready');\r\n                firstUpdate = false;\r\n            }\r\n\r\n        };\r\n\r\n        graph.on('changed', function (e) {\r\n            //  console.dir(e);\r\n        });\r\n\r\n        _.each(nodes, function (e, k) {\r\n            e.on('tapstart', function (e) {\r\n                e.target.data('dragging', true)\r\n            });\r\n            e.on('tapend', function (e) {\r\n                e.target.removeData('dragging');\r\n            });\r\n            e.on('position', 'node[dragging]', function (e) {\r\n                if (L.setNodePosition && e.target.data('dragging')) {\r\n                    L.setNodePosition(e.target.data().id);\r\n                }\r\n            });\r\n            graph.addNode(e.data().id);\r\n        });\r\n\r\n        _.each(edges, function (e, k) {\r\n            if (!edgesHash[e.data().source + ':' + e.data().target] && !edgesHash[e.data().target + ':' + e.data().source]) {\r\n                edgesHash[e.data().source + ':' + e.data().target] = e;\r\n                graph.addLink(e.data().source, e.data().target);\r\n            }\r\n        });\r\n\r\n        L = that.l(graph, layoutOptions);\r\n\r\n        _.each(nodes, function (e, k) {\r\n            var data = e.data();\r\n            //var pos = e.position();\r\n            if (data.pin) {\r\n                L.pinNode(data.id, true);\r\n                e.removeData('pin');\r\n                e.data('unpin', true);\r\n            } else if (data.unpin) {\r\n                L.pinNode(data.id, false);\r\n                e.removeData('unpin');\r\n            }\r\n            //if (pos.x && pos.y) {\r\n            //  L.setNodePosition(data.id, pos);\r\n            //}\r\n        });\r\n\r\n        var left = layoutOptions.iterations;\r\n        if (layoutOptions.async && layoutOptions.async.maxIterations) {\r\n            left = (layoutOptions.async.maxIterations / layoutOptions.async.stepsPerCycle).toFixed(0);\r\n        }\r\n\r\n        this.on('layoutstop', function () {\r\n            layoutOptions.iterations = 0;\r\n        });\r\n\r\n        L.on('stable', function () {\r\n            console.log('got Stable event');\r\n            left = 0;\r\n        });\r\n\r\n        if (!layoutOptions.async) {\r\n            layoutOptions.refreshInterval = 0;\r\n        }\r\n        var updateTimeout;\r\n        L.on('cycle', function (i, stop) {\r\n            if (layoutOptions.animate) {\r\n                update();\r\n            }\r\n            if (stop) {\r\n                update();\r\n                layout.trigger({ type: 'layoutstop', layout: layout });\r\n                layout.trigger({ type: 'layoutready', layout: layout });\r\n                return;\r\n            }\r\n            step(stop);\r\n        });\r\n\r\n        // if (layoutOptions.async) {\r\n        //     return this;\r\n        // }\r\n\r\n        var step = function (stop) {\r\n            if (left != 0 || !stop  /*condition for stopping layout*/) {\r\n                if (!updateTimeout || left == 0) {\r\n                    //   updateTimeout = setTimeout(function () {\r\n                    left--;\r\n                    //update();\r\n                    updateTimeout = null;\r\n                    var stop = L.step();\r\n                    stop ? left = 0 : false;\r\n                    if (!left) {\r\n                        step();\r\n                    }\r\n                    //   }, layoutOptions.refreshInterval);\r\n                }\r\n            } else {\r\n                update();\r\n                layout.trigger({ type: 'layoutstop', layout: layout });\r\n                layout.trigger({ type: 'layoutready', layout: layout });\r\n            }\r\n        };\r\n        step();\r\n        return this;\r\n    };\r\n\r\n    Layout.prototype.stop = function () {\r\n        // TODO: thread actions\r\n        // continuous/asynchronous layout may want to set a flag etc to let\r\n        // run() know to stop\r\n\r\n\r\n        if (this.thread) {\r\n            this.thread.stop();\r\n        }\r\n\r\n        this.trigger('layoutstop');\r\n\r\n        return this; // chaining\r\n    };\r\n\r\n    Layout.prototype.destroy = function () {\r\n        // clean up here if you create threads etc\r\n        // TODO: thread actions\r\n\r\n        if (this.thread) {\r\n            this.thread.stop();\r\n        }\r\n\r\n        return this; // chaining\r\n    };\r\n\r\n    return Layout;\r\n\r\n};\r\n\r\nmodule.exports = function get(cytoscape) {\r\n    return ngraph(cytoscape);\r\n};\r\n","'use strict';\r\n\r\n(function(){\r\n\r\n    // registers the extension on a cytoscape lib ref\r\n    var getLayout = require('./impl.js');\r\n    var register = function( cytoscape ){\r\n        var Layout = getLayout( cytoscape );\r\n        cytoscape('layout', 'cytoscape-ngraph.forcelayout', Layout);\r\n    };\r\n\r\n    if( typeof module !== 'undefined' && module.exports ){ // expose as a commonjs module\r\n        module.exports = register;\r\n    }\r\n\r\n    if( typeof define !== 'undefined' && define.amd ){ // expose as an amd/requirejs module\r\n        define('cytoscape-ngraph.forcelayout', function(){\r\n            return register;\r\n        });\r\n    }\r\n\r\n    if( typeof cytoscape !== 'undefined' ){ // expose to global cytoscape (i.e. window.cytoscape)\r\n        register( cytoscape );\r\n    }\r\n\r\n})();"]}