D3 Examples - Force Layout & Matrix Market Format

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  margin: 0;
}
​
.node {
  fill: steelblue;
}
​
.link {
  stroke: #ccc;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
​
var width = 960,
    height = 500;
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var force = d3.layout.force()
    .size([width, height]);
​
d3.text("can_161.mtx", function(error, text) {
  if (error) throw error;
​
  var graph = parseMtx(text);
​
  var link = svg.selectAll(".link")
      .data(graph.links)
    .enter().append("line")
      .attr("class", "link");
​
  var node = svg.selectAll(".node")
      .data(graph.nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 4.5)
      .call(force.drag);
​
  force
      .nodes(graph.nodes)
      .links(graph.links)
      .on("tick", tick)
      .start();
​
  function tick() {
    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });
​
    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  }
});
​
function parseMtx(text) {
  var nodes = [];
​
  var links = text
      .split(/\n/g) // split lines
      .filter(function(d) { return d.charAt(0) != "%"; }) // skip comments
      .slice(1, -1) // skip header line, last line
      .map(function(d) {
        d = d.split(/\s+/g);
        var source = d[0] - 1, target = d[1] - 1;
        return {
          source: nodes[source] || (nodes[source] = {index: source}),
          target: nodes[target] || (nodes[target] = {index: target})
        };
      });
​
  return {
    nodes: nodes,
    links: links
  };
}
​
</script>
​
    