experiments/book_circle.html at master · elos/experiments · GitHub

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<!DOCTYPE html>
<meta charset="UTF-8" />
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = window.innerWidth,
    height = window.innerHeight;

var nodes = d3.range(8).map(function() { return { radius: 10 } }),
    root = nodes[0];

root.radius = 0;
root.fixed = true;
root.px = width / 2.0;
root.py = height / 2.0;

// use this as the equation for charge
// until we come up with something better
// seems to work ok up until nodes.length == 12
var charge = 1000 * nodes.length - 18500;

var force = d3.layout.force()
    .gravity(0.15)
    .charge(function(d, i) { return i ? -2055 : charge; })
    .nodes(nodes)
    .size([width, height]);

force.start();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll("circle")
    .data(nodes.slice(1))
  .enter().append("circle")
    .attr("r", function(d) { return d.radius; })
    .style("fill", "white")
    .style("stroke", "lime")
    .style("stroke-width", "3")
    .call(force.drag);

force.on("tick", function(e) {
  var q = d3.geom.quadtree(nodes),
      i = 0,
      n = nodes.length;

  svg.selectAll("circle")
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
});

</script>
</body>