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add navigation, zoom to treemap (#396)
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* add navigation, zoom to treemap

* don't use stale form data
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@andrewhn @mistercrunch
andrewhn authored and mistercrunch committed Apr 26, 2016
1 parent c0fb9ee commit a2f2ad8
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Showing 4 changed files with 283 additions and 68 deletions.
56 changes: 42 additions & 14 deletions caravel/assets/visualizations/treemap.css
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Original file line number Diff line number Diff line change
@@ -1,15 +1,43 @@
.node {
border: solid 1px white;
font: 10px sans-serif;
line-height: 12px;
overflow: hidden;
position: absolute;
text-indent: 2px;
padding: 0px; /* form div giving top 1px */
box-sizing: content-box; /* otherwise inheriting border-box */
}

.treemap-container {
position: relative;
margin: auto;
text {
pointer-events: none;
}

.grandparent text {
font-weight: bold;
}

rect {
fill: none;
stroke: #fff;
}

rect.parent,
.grandparent rect {
stroke-width: 2px;
}

rect.parent {
pointer-events: none;
}

.grandparent rect {
fill: #eee;
}

.grandparent:hover rect {
fill: #aaa;
}

.children rect.parent,
.grandparent rect {
cursor: pointer;
}

.children rect.parent {
fill: #bbb;
fill-opacity: .5;
}

.children:hover rect.child {
fill: #bbb;
}
259 changes: 206 additions & 53 deletions caravel/assets/visualizations/treemap.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,68 +5,222 @@ var px = window.px || require('../javascripts/modules/caravel.js');
// CSS
require('./treemap.css');

/* Modified from https://bl.ocks.org/mbostock/4063582 */
/* Modified from http://bl.ocks.org/ganeshv/6a8e9ada3ab7f2d88022 */
function treemap(slice) {

var div = d3.select(slice.selector);

var _draw = function (data, eltWidth, eltHeight, includeTitle) {
var _draw = function (data, eltWidth, eltHeight, formData) {

var margin = { top: 0, right: 0, bottom: 0, left: 0 },
headerHeight = includeTitle ? 30 : 0,
navBarHeight = 36,
navBarTitleSize = navBarHeight / 3,
navBarBuffer = 10,
width = eltWidth - margin.left - margin.right,
height = eltHeight - headerHeight - margin.top - margin.bottom;
height = eltHeight - navBarHeight - navBarBuffer -
margin.top - margin.bottom,
transitioning,
formatNumber = d3.format(formData.number_format);

var x = d3.scale.linear()
.domain([0, width])
.range([0, width]);

var y = d3.scale.linear()
.domain([0, height])
.range([0, height]);

var treemap = d3.layout.treemap()
.size([width, height])
.value(function (d) { return d.value; });

var root = div.append("div")
.classed("treemap-container", true);

var header = root.append("div")
.style("width", (width + margin.left + margin.right) + "px")
.style("height", headerHeight + "px");

var container = root.append("div")
.style("position", "relative")
.style("width", (width + margin.left + margin.right) + "px")
.style("height", (height + margin.top + margin.bottom) + "px")
.style("left", margin.left + "px")
.style("top", margin.top + "px");

var position = function (selection) {
selection.style("left", function (d) { return d.x + "px"; })
.style("top", function (d) { return d.y + "px"; })
.style("width", function (d) { return Math.max(0, d.dx - 1) + "px"; })
.style("height", function (d) { return Math.max(0, d.dy - 1) + "px"; });
.children(function (d, depth) { return depth ? null : d._children; })
.sort(function (a, b) { return a.value - b.value; })
.ratio(formData.treemap_ratio)
.mode("squarify")
.round(false);

var svg = div.append("svg")
.attr("width", eltWidth)
.attr("height", eltHeight);

var chartContainer = svg.append("g")
.attr("transform", "translate(" + margin.left + "," +
(margin.top + navBarHeight + navBarBuffer) + ")")
.style("shape-rendering", "crispEdges");

var grandparent = svg.append("g")
.attr("class", "grandparent")
.attr("transform", "translate(0," + (margin.top + navBarBuffer / 2) + ")");

grandparent.append("rect")
.attr("width", width)
.attr("height", navBarHeight);

grandparent.append("text")
.attr("x", width / 2)
.attr("y", navBarHeight / 2 + navBarTitleSize / 2)
.style("font-size", navBarTitleSize + "px")
.style("text-anchor", "middle");

var initialize = function (root) {
root.x = root.y = 0;
root.dx = width;
root.dy = height;
root.depth = 0;
};

// Aggregate the values for internal nodes. This is normally done by the
// treemap layout, but not here because of our custom implementation.
// We also take a snapshot of the original children (_children) to avoid
// the children being overwritten when when layout is computed.
var accumulate = function (d) {
return (d._children = d.children)
? d.value = d.children.reduce(function (p, v) { return p + accumulate(v); }, 0)
: d.value;
};

// Compute the treemap layout recursively such that each group of siblings
// uses the same size (1x1) rather than the dimensions of the parent cell.
// This optimizes the layout for the current zoom state. Note that a wrapper
// object is created for the parent node for each group of siblings so that
// the parents dimensions are not discarded as we recurse. Since each group
// of sibling was laid out in 1x1, we must rescale to fit using absolute
// coordinates. This lets us use a viewport to zoom.
var layout = function (d) {
if (d._children) {
treemap.nodes({ _children: d._children });
d._children.forEach(function (c) {
c.x = d.x + c.x * d.dx;
c.y = d.y + c.y * d.dy;
c.dx *= d.dx;
c.dy *= d.dy;
c.parent = d;
layout(c);
});
}
};

var display = function (d) {

var transition = function (d) {
if (transitioning || !d) { return; }
transitioning = true;

var g2 = display(d),
t1 = g1.transition().duration(750),
t2 = g2.transition().duration(750);

// Update the domain only after entering new elements.
x.domain([d.x, d.x + d.dx]);
y.domain([d.y, d.y + d.dy]);

// Enable anti-aliasing during the transition.
chartContainer.style("shape-rendering", null);

// Draw child nodes on top of parent nodes.
chartContainer.selectAll(".depth").sort(function (a, b) { return a.depth - b.depth; });

// Fade-in entering text.
g2.selectAll("text").style("fill-opacity", 0);

// Transition to the new view.
t1.selectAll(".ptext").call(text).style("fill-opacity", 0);
t1.selectAll(".ctext").call(text2).style("fill-opacity", 0);
t2.selectAll(".ptext").call(text).style("fill-opacity", 1);
t2.selectAll(".ctext").call(text2).style("fill-opacity", 1);
t1.selectAll("rect").call(rect);
t2.selectAll("rect").call(rect);

// Remove the old node when the transition is finished.
t1.remove().each("end", function () {
chartContainer.style("shape-rendering", "crispEdges");
transitioning = false;
});
};

grandparent
.datum(d.parent)
.on("click", transition)
.select("text")
.text(name(d));

var g1 = chartContainer.append("g")
.datum(d)
.attr("class", "depth");

var g = g1.selectAll("g")
.data(d._children)
.enter().append("g");

g.filter(function (d) { return d._children; })
.classed("children", true)
.on("click", transition);

var children = g.selectAll(".child")
.data(function (d) { return d._children || [d]; })
.enter().append("g");

children.append("rect")
.attr("class", "child")
.call(rect)
.append("title")
.text(function (d) { return d.name + " (" + formatNumber(d.value) + ")"; });

children.append("text")
.attr("class", "ctext")
.text(function (d) { return d.name; })
.call(text2);

g.append("rect")
.attr("class", "parent")
.call(rect);

var t = g.append("text")
.attr("class", "ptext")
.attr("dy", ".75em");

t.append("tspan")
.text(function (d) { return d.name; });
t.append("tspan")
.attr("dy", "1.0em")
.text(function (d) { return formatNumber(d.value); });
t.call(text);

g.selectAll("rect")
.style("fill", function (d) { return px.color.category21(d.name); });

return g;
};

var text = function (selection) {
selection.selectAll("tspan")
.attr("x", function (d) { return x(d.x) + 6; });
selection.attr("x", function (d) { return x(d.x) + 6; })
.attr("y", function (d) { return y(d.y) + 6; })
.style("opacity", function (d) { return this.getComputedTextLength() < x(d.x + d.dx) - x(d.x) ? 1 : 0; });
};

var text2 = function (selection) {
selection.attr("x", function (d) { return x(d.x + d.dx) - this.getComputedTextLength() - 6; })
.attr("y", function (d) { return y(d.y + d.dy) - 6; })
.style("opacity", function (d) { return this.getComputedTextLength() < x(d.x + d.dx) - x(d.x) ? 1 : 0; });
};

var rect = function (selection) {
selection.attr("x", function (d) { return x(d.x); })
.attr("y", function (d) { return y(d.y); })
.attr("width", function (d) { return x(d.x + d.dx) - x(d.x); })
.attr("height", function (d) { return y(d.y + d.dy) - y(d.y); });
};

var name = function (d) {
return d.parent
? name(d.parent) + " / " + d.name + " (" + formatNumber(d.value) + ")"
: d.name + " (" + formatNumber(d.value) + ")";
};

container.datum(data).selectAll(".node")
.data(treemap.nodes)
.enter().append("div")
.attr("class", "node")
.call(position)
.style("background", function (d) {
return d.children ? px.color.category21(d.name) : null;
})
.style("color", function (d) {
// detect if our background is dark and we need a
// light text color or vice-versa
var bg = d.parent ? px.color.category21(d.parent.name) : null;
if (bg) {
return d3.hsl(bg).l < 0.35 ? '#d3d3d3' : '#111111';
}
})
.text(function (d) { return d.children ? null : d.name; });

if (includeTitle) {
// title to help with multiple metrics (if any)
header.append("span")
.style("font-size", "18px")
.style("font-weight", "bold")
.text(data.name);
}
initialize(data);
accumulate(data);
layout(data);
display(data);

};

Expand All @@ -83,9 +237,8 @@ function treemap(slice) {
var width = slice.width();
// facet muliple metrics (no sense in combining)
var height = slice.height() / json.data.length;
var includeTitles = json.data.length > 1;
for (var i = 0, l = json.data.length; i < l; i ++) {
_draw(json.data[i], width, height, includeTitles);
_draw(json.data[i], width, height, json.form_data);
}

slice.done(json);
Expand Down
23 changes: 22 additions & 1 deletion caravel/forms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,10 +6,11 @@

from collections import OrderedDict
from copy import copy
import math

from wtforms import (
Form, SelectMultipleField, SelectField, TextField, TextAreaField,
BooleanField, IntegerField, HiddenField)
BooleanField, IntegerField, HiddenField, DecimalField)
from wtforms import validators, widgets

from caravel import app
Expand Down Expand Up @@ -336,6 +337,26 @@ def __init__(self, viz):
'9/91 percentiles',
])
),
'treemap_ratio': DecimalField(
'Ratio',
default=0.5 * (1 + math.sqrt(5)), # d3 default, golden ratio
description='Target aspect ratio for treemap tiles.',
),
'number_format': FreeFormSelectField(
'Number format',
default='.3s',
choices=[
('.3s', '".3s" | 12.3k'),
('.3%', '".3%" | 1234543.210%'),
('.4r', '".4r" | 12350'),
('.3f', '".3f" | 12345.432'),
('+,', '"+," | +12,345.4321'),
('$,.2f', '"$,.2f" | $12,345.43'),
],
description="D3 format syntax for numbers "
"https://github.com/mbostock/\n"
"d3/wiki/Formatting"),

'row_limit':
FreeFormSelectField(
'Row limit',
Expand Down
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