source: Dev/trunk/d3/examples/bundle/bundle-radial.js @ 76

var r = 960 / 2,
    splines = [];

var cluster = d3.layout.cluster()
    .size([360, r - 120])
    .sort(null)
    .value(function(d) { return d.size; });

var bundle = d3.layout.bundle();

var line = d3.svg.line.radial()
    .interpolate("bundle")
    .tension(.85)
    .radius(function(d) { return d.y; })
    .angle(function(d) { return d.x / 180 * Math.PI; });

var vis = d3.select("#chart").append("svg:svg")
    .attr("width", r * 2)
    .attr("height", r * 2)
  .append("svg:g")
    .attr("transform", "translate(" + r + "," + r + ")");

d3.json("../data/flare-imports.json", function(classes) {
  var nodes = cluster.nodes(packages.root(classes)),
      links = packages.imports(nodes);

  vis.selectAll("path.link")
      .data(splines = bundle(links))
    .enter().append("svg:path")
      .attr("class", "link")
      .attr("d", line);

  vis.selectAll("g.node")
      .data(nodes.filter(function(n) { return !n.children; }))
    .enter().append("svg:g")
      .attr("class", "node")
      .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; })
    .append("svg:text")
      .attr("dx", function(d) { return d.x < 180 ? 8 : -8; })
      .attr("dy", ".31em")
      .attr("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
      .attr("transform", function(d) { return d.x < 180 ? null : "rotate(180)"; })
      .text(function(d) { return d.key; });
});

d3.select(window).on("mousemove", function() {
  vis.selectAll("path.link")
      .data(splines)
      .attr("d", line.tension(Math.min(1, d3.event.clientX / 960)));
});