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PMeinshausen/course.json

Created August 15, 2013 16:54
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course.json
{
"name": "Gov 2001",
"children": [
{
"name": "The Basics",
"children": [
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Course Overview",
"size": 104,
"value": 15.6443908991413725
},
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Introductory Statistics",
"size": 3250,
"value": 15.086410275323782
}
]
},{
"name": "Theories of Inference",
"children": [
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Problems of Inference",
"size": 1279,
"value": 7.153833801578843
},
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Likelihood",
"size": 2582,
"value": 7.856319571406588
},
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Other Theories",
"size": 5164,
"value": 8.549466751966532
}
]
},{
"name": "Maximum Likelihood Estimation",
"children": [
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Problem Sets",
"size": 59,
"value": 10.07753744390572
},
{
"url": "http://projects.iq.harvard.edu/gov2001",
"name": "Lectures",
"size": 317,
"value": 10.75890177387728
}
]
}
]
}
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>Gov 2001 Course Map</title>
<style>
#chart {
width: 820px;
height: 700px;
background: #bbb;
margin: 1px auto;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
text {
pointer-events: none;
}
.grandparent text { /* header text */
font-weight: bold;
font-size: large;
font-family: "Open Sans", Helvetica, Arial, sans-serif;
}
rect {
fill: none;
stroke: #fff;
}
rect.parent,
.grandparent rect {
stroke-width: 2px;
}
.grandparent rect {
fill: #fff;
}
.children rect.parent,
.grandparent rect {
cursor: pointer;
}
rect.parent {
pointer-events: all;
}
.children:hover rect.child,
.grandparent:hover rect {
fill: #aaa;
}
.textdiv { /* text in the boxes */
font-size: large;
padding: 5px;
font-family: "Open Sans", Helvetica, Arial, sans-serif;
}
</style>
<p id="chart">
<script src="http://d3js.org/d3.v2.js"></script>
<script src="http://code.jquery.com/jquery-1.7.1.js"></script>
<script>
/*
* If running inside bl.ocks.org we want to resize the iframe to fit both graphs
* This bit of code was shared originally at https://gist.github.com/benjchristensen/2657838
*/
if(parent.document.getElementsByTagName("iframe")[0]) {
parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 700px !important');
}
var margin = {top: 20, right: 0, bottom: 0, left: 0},
width = 820,
height = 700 - margin.top - margin.bottom,
formatNumber = d3.format(",d"),
transitioning;
/* create x and y scales */
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()
.children(function(d, depth) { return depth ? null : d.children; })
.sort(function(a, b) { return a.value - b.value; })
.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
.round(false);
/* create svg */
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.bottom + margin.top)
.style("margin-left", -margin.left + "px")
.style("margin.right", -margin.right + "px")
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.style("shape-rendering", "crispEdges");
var color = d3.scale.category20c();
var grandparent = svg.append("g")
.attr("class", "grandparent");
grandparent.append("rect")
.attr("y", -margin.top)
.attr("width", width)
.attr("height", margin.top);
grandparent.append("text")
.attr("x", 6)
.attr("y", 6 - margin.top)
.attr("dy", ".75em");
/* load in data, display root */
d3.json("course.json", function(root) {
initialize(root);
accumulate(root);
layout(root);
display(root);
function initialize(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 the custom implementation.
function accumulate(d) {
return 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 (1×1) 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 parent’s dimensions are not discarded as we recurse. Since each group
// of sibling was laid out in 1×1, we must rescale to fit using absolute
// coordinates. This lets us use a viewport to zoom.
function layout(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);
});
}
}
/* display shows the treemap and writes the embedded transition function */
function display(d) {
/* create grandparent bar at top */
grandparent
.datum(d.parent)
.on("click", transition)
.select("text")
.text(name(d));
var g1 = svg.insert("g", ".grandparent")
.datum(d)
.attr("class", "depth");
/* add in data */
var g = g1.selectAll("g")
.data(d.children)
.enter().append("g");
/* transition on child click */
g.filter(function(d) { return d.children; })
.classed("children", true)
.on("click", transition);
/* write children rectangles */
g.selectAll(".child")
.data(function(d) { return d.children || [d]; })
.enter().append("rect")
.attr("class", "child")
.call(rect)
.append("title")
.text(function(d) { return d.name + " " + formatNumber(d.size); });
/* write parent rectangle */
g.append("rect")
.attr("class", "parent")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Chrome displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.append("title")
.text(function(d) { return d.name + " " + formatNumber(d.size); }); /*should be d.value*/
/* Adding a foreign object instead of a text object, allows for text wrapping */
g.append("foreignObject")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Firefox displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.attr("class","foreignobj")
.append("xhtml:div")
.attr("dy", ".75em")
.html(function(d) { return d.name;
})
.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS
/* create transition function for transitions */
function transition(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.
svg.style("shape-rendering", null);
// Draw child nodes on top of parent nodes.
svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
// Fade-in entering text.
g2.selectAll("text").style("fill-opacity", 0);
g2.selectAll("foreignObject div").style("display", "none"); /*added*/
// Transition to the new view.
t1.selectAll("text").call(text).style("fill-opacity", 0);
t2.selectAll("text").call(text).style("fill-opacity", 1);
t1.selectAll("rect").call(rect);
t2.selectAll("rect").call(rect);
t1.selectAll(".textdiv").style("display", "none"); /* added */
t1.selectAll(".foreignobj").call(foreign); /* added */
t2.selectAll(".textdiv").style("display", "block"); /* added */
t2.selectAll(".foreignobj").call(foreign); /* added */
// Remove the old node when the transition is finished.
t1.remove().each("end", function() {
svg.style("shape-rendering", "crispEdges");
transitioning = false;
});
}//endfunc transition
return g;
}//endfunc display
function text(text) {
text.attr("x", function(d) { return x(d.x) + 6; })
.attr("y", function(d) { return y(d.y) + 6; });
}
function rect(rect) {
rect.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); })
.style("background", function(d) { return d.parent ? color(d.name) : null; });
}
function foreign(foreign){ /* added */
foreign.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); });
}
function name(d) {
return d.parent
? name(d.parent) + "." + d.name
: d.name;
}
});
</script>
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