<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Chord Diagram</title>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.layout.js"></script>
<style type="text/css">
body {
font: 10px sans-serif;
}
path.chord {
fill-opacity: .67;
}
</style>
</head>
<body>
<script type="text/javascript">
var r1 = 960 / 2,
r0 = r1 - 120;
var fill = d3.scale.category20c();
var chord = d3.layout.chord()
.padding(.04)
.sortSubgroups(d3.descending)
.sortChords(d3.descending);
var arc = d3.svg.arc()
.innerRadius(r0)
.outerRadius(r0 + 20);
var svg = d3.select("body").append("svg:svg")
.attr("width", r1 * 2)
.attr("height", r1 * 2)
.append("svg:g")
.attr("transform", "translate(" + r1 + "," + r1 + ")");
d3.json("../data/flare-imports.json", function(imports) {
var indexByName = {},
nameByIndex = {},
matrix = [],
n = 0;
// Returns the Flare package name for the given class name.
function name(name) {
return name.substring(0, name.lastIndexOf(".")).substring(6);
}
// Compute a unique index for each package name.
imports.forEach(function(d) {
d = name(d.name);
if (!(d in indexByName)) {
nameByIndex[n] = d;
indexByName[d] = n++;
}
});
// Construct a square matrix counting package imports.
imports.forEach(function(d) {
var source = indexByName[name(d.name)],
row = matrix[source];
if (!row) {
row = matrix[source] = [];
for (var i = -1; ++i < n;) row[i] = 0;
}
d.imports.forEach(function(d) { row[indexByName[name(d)]]++; });
});
chord.matrix(matrix);
var g = svg.selectAll("g.group")
.data(chord.groups)
.enter().append("svg:g")
.attr("class", "group");
g.append("svg:path")
.style("fill", function(d) { return fill(d.index); })
.style("stroke", function(d) { return fill(d.index); })
.attr("d", arc);
g.append("svg:text")
.each(function(d) { d.angle = (d.startAngle + d.endAngle) / 2; })
.attr("dy", ".35em")
.attr("text-anchor", function(d) { return d.angle > Math.PI ? "end" : null; })
.attr("transform", function(d) {
return "rotate(" + (d.angle * 180 / Math.PI - 90) + ")"
+ "translate(" + (r0 + 26) + ")"
+ (d.angle > Math.PI ? "rotate(180)" : "");
})
.text(function(d) { return nameByIndex[d.index]; });
svg.selectAll("path.chord")
.data(chord.chords)
.enter().append("svg:path")
.attr("class", "chord")
.style("stroke", function(d) { return d3.rgb(fill(d.source.index)).darker(); })
.style("fill", function(d) { return fill(d.source.index); })
.attr("d", d3.svg.chord().radius(r0));
});
</script>
</body>
</html>