D3 Examples - Force-Directed Web Worker

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<!DOCTYPE html>
<meta charset="utf-8">
<div id="progress"></div>
<canvas width="960" height="960"></canvas>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script>
​
var nodes = d3.range(1000).map(function(i) {
  return {
    index: i
  };
});
​
var links = d3.range(nodes.length - 1).map(function(i) {
  return {
    source: Math.floor(Math.sqrt(i)),
    target: i + 1
  };
});
​
var meter = document.querySelector("#progress"),
    canvas = document.querySelector("canvas"),
    context = canvas.getContext("2d"),
    width = canvas.width,
    height = canvas.height;
​
var worker = new Worker("worker.js");
​
worker.postMessage({
  nodes: nodes,
  links: links
});
​
worker.onmessage = function(event) {
  switch (event.data.type) {
    case "tick": return ticked(event.data);
    case "end": return ended(event.data);
  }
};
​
function ticked(data) {
  var progress = data.progress;
​
  meter.style.width = 100 * progress + "%";
}
​
function ended(data) {
  var nodes = data.nodes,
      links = data.links;
​
  meter.style.display = "none";
​
  context.clearRect(0, 0, width, height);
  context.save();
  context.translate(width / 2, height / 2);
​
  context.beginPath();
  links.forEach(drawLink);
  context.strokeStyle = "#aaa";
  context.stroke();
​
  context.beginPath();
  nodes.forEach(drawNode);
  context.fill();
  context.strokeStyle = "#fff";
  context.stroke();
​
  context.restore();
}
​
function drawLink(d) {
  context.moveTo(d.source.x, d.source.y);
  context.lineTo(d.target.x, d.target.y);
}
​
function drawNode(d) {
  context.moveTo(d.x + 3, d.y);
  context.arc(d.x, d.y, 3, 0, 2 * Math.PI);
}
​
</script>
<style>
​
#progress {
  position: fixed;
  top: 0;
  left: -6px;
  width: 0%;
  height: 2px;
  background: red;
}
​
#progress:before,
#progress:after {
  content: "";
  position: absolute;
  height: 2px;
  opacity: 0.6;
  box-shadow: red 1px 0 6px 1px;
  border-radius: 100%;
}
​
#progress:before {
  width: 20px;
  right: 0;
  clip: rect(-6px, 22px, 14px, 10px);
}
​
#progress:after {
  width: 180px;
  right: -80px;
  clip: rect(-6px, 90px, 14px, -6px);
}
​
</style>
​
    