diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/examples/partition/partition-sunburst.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/examples/partition/partition-sunburst.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,72 @@
+var w = 960,
+    h = 700,
+    r = Math.min(w, h) / 2,
+    color = d3.scale.category20c();
+
+var vis = d3.select("#chart").append("svg:svg")
+    .attr("width", w)
+    .attr("height", h)
+  .append("svg:g")
+    .attr("transform", "translate(" + w / 2 + "," + h / 2 + ")");
+
+var partition = d3.layout.partition()
+    .sort(null)
+    .size([2 * Math.PI, r * r])
+    .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("../data/flare.json", function(json) {
+  var path = vis.data([json]).selectAll("path")
+      .data(partition.nodes)
+    .enter().append("svg:path")
+      .attr("display", function(d) { return d.depth ? null : "none"; }) // hide inner ring
+      .attr("d", arc)
+      .attr("fill-rule", "evenodd")
+      .style("stroke", "#fff")
+      .style("fill", function(d) { return color((d.children ? d : d.parent).name); })
+      .each(stash);
+
+  d3.select("#size").on("click", function() {
+    path
+        .data(partition.value(function(d) { return d.size; }))
+      .transition()
+        .duration(1500)
+        .attrTween("d", arcTween);
+
+    d3.select("#size").classed("active", true);
+    d3.select("#count").classed("active", false);
+  });
+
+  d3.select("#count").on("click", function() {
+    path
+        .data(partition.value(function(d) { return 1; }))
+      .transition()
+        .duration(1500)
+        .attrTween("d", arcTween);
+
+    d3.select("#size").classed("active", false);
+    d3.select("#count").classed("active", true);
+  });
+});
+
+// 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);
+  };
+}