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<!DOCTYPE html>
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<title>JSDoc: Source: camera/Cameras.js</title>
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<h1 class="page-title">Source: camera/Cameras.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>//------------------------------------------------------------------------------
// Constructor scope
//------------------------------------------------------------------------------
/**
* Creates a new Cameras instance.
*
* @constructor
*
* @param {rune.display.Stage} input What the camera system should render.
*
* @class
* @classdesc
*
* The Cameras class represents a camera system with the ability to create,
* delete and manage camera objects.
*/
rune.camera.Cameras = function(input) {
//--------------------------------------------------------------------------
// Private properties
//--------------------------------------------------------------------------
/**
* Contains the camera objects used by the camera system.
*
* @type {Array.<rune.camera.Camera>}
* @private
*/
this.m_cameras = [];
/**
* Camera system input, ie. what is to be rendered by one or more cameras.
*
* @type {rune.display.Stage}
* @private
*/
this.m_input = input || null;
}
//------------------------------------------------------------------------------
// Public prototype getter and setter methods
//------------------------------------------------------------------------------
/**
* Returns the number of available cameras.
*
* @member {number} length
* @memberof rune.camera.Cameras
* @instance
* @readonly
*/
Object.defineProperty(rune.camera.Cameras.prototype, "length", {
/**
* @this rune.camera.Cameras
* @ignore
*/
get : function() {
return (this.m_cameras) ? this.m_cameras.length : 0;
}
});
//------------------------------------------------------------------------------
// Public prototype methods (API)
//------------------------------------------------------------------------------
/**
* Adds a Camera instance to this Cameras instance.
*
* @param {rune.camera.Camera} camera The camera to add.
*
* @throws {TypeError} If no valid camera object.
*
* @returns {rune.camera.Camera}
*/
rune.camera.Cameras.prototype.addCamera = function(camera) {
if (camera instanceof rune.camera.Camera) {
if (this.m_cameras.indexOf(camera) === -1) {
this.m_cameras.push(camera);
camera.input = this.m_input;
camera.init();
}
} else throw new TypeError();
return camera;
};
/**
* Creates a new Camera instance.
*
* @param {number} [x=0] Camera position in x coordinates.
* @param {number} [y=0] Camera position in y coordinates.
* @param {number} [width=384] Camera size in width.
* @param {number} [height=216] Camera size in height.
*
* @returns {rune.camera.Camera} The new camera object.
*/
rune.camera.Cameras.prototype.createCamera = function(x, y, width, height) {
var camera = new rune.camera.Camera(
x || 0,
y || 0,
width || rune.system.Application['instance']['screen']['width'],
height || rune.system.Application['instance']['screen']['height']
);
return camera;
};
/**
* Returns the camera object instance that exists at the specified index.
*
* @param {number} index The index position of the camera object.
*
* @throws {RangeError} Throws if the index does not exist in the camera list.
*
* @return {rune.camera.Camera}
*/
rune.camera.Cameras.prototype.getCameraAt = function(index) {
if (index > -1 && index < this.m_cameras.length) {
return this.m_cameras[index];
} else throw new RangeError();
};
/**
* Returns all Camera instances. Note that this method is primarily intended
* for internal use.
*
* @return {Array.<rune.camera.Camera>}
*/
rune.camera.Cameras.prototype.getCameras = function() {
return this.m_cameras;
};
/**
* Removes a specific Camera instance.
*
* @param {rune.camera.Camera} camera Camera to remove.
* @param {boolean} [dispose=false] If the Camera instance is to be completely removed from memory.
*
* @throws {TypeError} If invalid camera object.
*
* @returns {rune.camera.Camera}
*/
rune.camera.Cameras.prototype.removeCamera = function(camera, dispose) {
if (camera instanceof rune.camera.Camera) {
var i = this.m_cameras.indexOf(camera);
if (i > -1) {
this.m_cameras.splice(i, 1);
if (dispose === true) {
camera.dispose();
camera = null;
}
}
} else throw new TypeError();
return (dispose) ? null : camera;
};
/**
* Removes all Camera instances.
*
* @param {boolean} [dispose=false] If the Camera instances are to be completely removed from memory.
*
* @returns {undefined}
*/
rune.camera.Cameras.prototype.removeCameras = function(dispose) {
while (this.m_cameras.length > 0) {
this.removeCamera(this.getCameraAt(0), dispose);
}
};
//------------------------------------------------------------------------------
// Public prototype methods (ENGINE)
//------------------------------------------------------------------------------
/**
* Updates the camera system. This method is called automatically once per tick.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @ignore
*/
rune.camera.Cameras.prototype.update = function(step) {
this.m_updateCameras(step);
};
/**
* Removes the camera system and thus all cameras. The camera system becomes
* unusable after this method is called.
*
* @returns {undefined}
* @ignore
*/
rune.camera.Cameras.prototype.dispose = function() {
this.m_disposeCameras();
};
//------------------------------------------------------------------------------
// Private prototype methods
//------------------------------------------------------------------------------
/**
* Updates all cameras.
*
* @param {number} step Current time step.
*
* @returns {undefined}
* @private
*/
rune.camera.Cameras.prototype.m_updateCameras = function(step) {
var cameras = this.m_cameras;
for (var i = 0, l = cameras.length; i < l; i++) {
this.m_updateCamera(cameras[i], step);
}
};
/**
* Updates a specific camera.
*
* @param {rune.camera.Camera} camera Camera to be updated.
* @param {number} step Current time step.
*
* @returns {undefined}
* @private
*/
rune.camera.Cameras.prototype.m_updateCamera = function(camera, step) {
if (camera['active'] == true) {
camera.update(step);
}
};
/**
* Removes all cameras.
*
* @returns {undefined}
* @ignore
*/
rune.camera.Cameras.prototype.m_disposeCameras = function() {
this.removeCameras(true);
this.m_cameras = null;
this.m_input = null;
};</code></pre>
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