D3 Examples - Force Layout from Adjacency List

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
line {
  stroke: #ccc;
  stroke-width: 1.5px;
}
​
</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.json("graph.json", function(error, graph) {
  if (error) throw error;
​
  var nodes = d3.values(graph),
      links = d3.merge(nodes.map(function(source) {
        return source.map(function(target) {
          return {source: source, target: graph[target]};
        });
      }));
​
  force
      .nodes(nodes)
      .links(links)
      .start();
​
  var link = svg.selectAll(".link")
      .data(links)
    .enter().append("line");
​
  var node = svg.selectAll(".node")
      .data(nodes)
    .enter().append("circle")
      .attr("r", 5)
      .call(force.drag);
​
  force.on("tick", function() {
    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; });
  });
});
​
</script>
​
    