test.xhtml

<html xmlns="http://www.w3.org/1999/xhtml">
  <meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
  <head>
    <style>
      .link {
      fill: none;
      stroke: #666;
      stroke-width: 1.5px;
      }
    </style>
    <script src="//d3js.org/d3.v3.min.js"></script>
  </head>
  <body>
    <div class="external-data">
    </div>

    <script>

      // http://blog.thomsonreuters.com/index.php/mobile-patent-suits-graphic-of-the-day/
      var links = [
      {source: "file1", target: "file2", type: "suit", shape: "rect"},
      {source: "file1", target: "file3", type: "suit", shape: "rect"}
      ];

      var nodes = {};

      // Compute the distinct nodes from the links.
      links.forEach(function(link) {
      link.source = nodes[link.source] || (nodes[link.source] = {name: link.source, shape: link.shape});
      link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, shape: link.shape});
      });

      var width = 960,
      height = 250;

      var force = d3.layout.force()
      .nodes(d3.values(nodes))
      .links(links)
      .size([width, height])
      .linkDistance(150)
      .charge(-300)
      .on("tick", tick)
      .start();

      var svg = d3.select(".external-data").append("svg")
      .attr("width", width)
      .attr("height", height);

      // Per-type markers, as they don't inherit styles.
      svg.append("defs").selectAll("marker")
      .data(["suit"])
      .enter().append("marker")
      .attr("id", function(d) { return d; })
      .attr("viewBox", "0 -5 10 10")
      .attr("refX", 15)
      .attr("refY", -1.5)
      .attr("markerWidth", 6)
      .attr("markerHeight", 6)
      .attr("orient", "auto")
      .append("path")
      .attr("d", "M0,-5L10,0L0,5");

      var path = svg.append("g").selectAll("path")
      .data(force.links())
      .enter().append("path")
      .attr("class", function(d) { return "link " + d.type; })
      .attr("marker-end", function(d) { return "url(#" + d.type + ")"; });

      var circlesOrRects = svg.append("g").selectAll(".foo")
      .data(force.nodes())
      .enter()
      .append("path")
      .attr("d", d3.svg.symbol().size(200)
      .type(function(d) { return d.shape == "rect" ? "circle" : "square"; }))
      .attr("fill", function(d){return d.shape == "rect" ? "blue" : "red"})
      .call(force.drag);

      var text = svg.append("g").selectAll("text")
      .data(force.nodes())
      .enter().append("text")
      .attr("x", 8)
      .attr("y", ".31em")
      .text(function(d) { return d.name; });

      // Use elliptical arc path segments to doubly-encode directionality.
      function tick() {
      path.attr("d", linkArc);
      circlesOrRects.attr("transform", transform)
      text.attr("transform", transform);
      }

      function linkArc(d) {
      var dx = d.target.x - d.source.x,
      dy = d.target.y - d.source.y,
      dr = 0;
      return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y;
      }

      function transform(d) {
      return "translate(" + d.x + "," + d.y + ")";
      }
    </script>

  </body>
</html>