D3 Examples - Sunburst Partition

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}
​
form {
  position: absolute;
  right: 10px;
  top: 10px;
}
​
</style>
<form>
  <label><input type="radio" name="mode" value="size"> Size</label>
  <label><input type="radio" name="mode" value="count" checked> Count</label>
</form>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
​
var width = 960,
    height = 700,
    radius = Math.min(width, height) / 2,
    color = d3.scale.category20c();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height * .52 + ")");
​
var partition = d3.layout.partition()
    .sort(null)
    .size([2 * Math.PI, radius * radius])
    .value(function(d) { return 1; });
​
var arc = d3.svg.arc()
    .startAngle(function(d) { return d.x; })
    .endAngle(function(d) { return d.x + d.dx; })
    .innerRadius(function(d) { return Math.sqrt(d.y); })
    .outerRadius(function(d) { return Math.sqrt(d.y + d.dy); });
​
d3.json("flare.json", function(error, root) {
  if (error) throw error;
​
  var path = svg.datum(root).selectAll("path")
      .data(partition.nodes)
    .enter().append("path")
      .attr("display", function(d) { return d.depth ? null : "none"; }) // hide inner ring
      .attr("d", arc)
      .style("stroke", "#fff")
      .style("fill", function(d) { return color((d.children ? d : d.parent).name); })
      .style("fill-rule", "evenodd")
      .each(stash);
​
  d3.selectAll("input").on("change", function change() {
    var value = this.value === "count"
        ? function() { return 1; }
        : function(d) { return d.size; };
​
    path
        .data(partition.value(value).nodes)
      .transition()
        .duration(1500)
        .attrTween("d", arcTween);
  });
});
​
// Stash the old values for transition.
function stash(d) {
  d.x0 = d.x;
  d.dx0 = d.dx;
}
​
// Interpolate the arcs in data space.
function arcTween(a) {
  var i = d3.interpolate({x: a.x0, dx: a.dx0}, a);
  return function(t) {
    var b = i(t);
    a.x0 = b.x;
    a.dx0 = b.dx;
    return arc(b);
  };
}
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
​
    