var w = 960,

h = 500,

fill = d3.scale.ordinal().range(colorbrewer.Greys[9].slice(1, 4)),

stroke = d3.scale.linear().domain([0, 1e4]).range(["brown", "steelblue"]);

var treemap = d3.layout.treemap()

.size([w, h])

.value(function(d) { return d.size; });

var bundle = d3.layout.bundle();

var div = d3.select("#chart").append("div")

.style("position", "relative")

.style("width", w + "px")

.style("height", h + "px");

var line = d3.svg.line()

.interpolate("bundle")

.tension(.85)

.x(function(d) { return d.x + d.dx / 2; })

.y(function(d) { return d.y + d.dy / 2; });

d3.json("../data/flare-imports.json", function(classes) {

var nodes = treemap.nodes(packages.root(classes)),

links = packages.imports(nodes);

div.selectAll("div")

.data(nodes)

.enter().append("div")

.attr("class", "cell")

.style("background", function(d) { return d.children ? fill(d.key) : null; })

.call(cell)

.text(function(d) { return d.children ? null : d.key; });

div.append("svg:svg")

.attr("width", w)

.attr("height", h)

.style("position", "absolute")

.selectAll("path.link")

.data(bundle(links))

.enter().append("svg:path")

.style("stroke", function(d) { return stroke(d[0].value); })

.attr("class", "link")

.attr("d", line);

});

function cell() {

this

.style("left", function(d) { return d.x + "px"; })

.style("top", function(d) { return d.y + "px"; })

.style("width", function(d) { return d.dx - 1 + "px"; })

.style("height", function(d) { return d.dy - 1 + "px"; });

}