D3 Examples - Labeled Force Layout 2

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.link {
  stroke: #ccc;
}
​
.node text {
  pointer-events: none;
  font: 10px sans-serif;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var link,
    node,
    width = 960,
    height = 700,
    maxDist = 300,
    minDist = 20,
        svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height),
        force = d3.layout.force()
      .gravity(0.05)
      .charge(-500)
      .size([width, height]);
​
d3.json("graph.json", function(error, json) {
  if (error) throw error;
​
  force
      .nodes(json.nodes)
      .links(json.links)
        .distance(function(d){ 
            //console.log(d.source.index);
            return Math.random() * maxDist + minDist; 
        })
      .start();
​
  link = svg.selectAll(".link")
      .data(json.links)
      .enter().append("line")
      .attr("class", "link");
​
  // Create a 'g' node for each data entry
  node = svg.selectAll(".node")
      .data(json.nodes)
      .enter().append("g")
      .attr("class", "node");
      //.call(force.drag);
​
  // Insert image element
  node.append("image")
      .attr("xlink:href", "https://github.com/favicon.ico")
      .attr("x", -8)
      .attr("y", -8)
      .attr("width", 16)
      .attr("height", 16);
  
  // Insert rect element with no width yet
  node.append("rect")
      .attr("x", 6)
      .attr("y", -10)
        .attr("rx", 8)
        .attr("ry", 8)
      .attr("height", 24)
      .style("fill", "#FFE6F0");
​
  // Add title name
  node.append("text")
      .attr("dx", 12)
      .attr("dy", ".35em")
        .attr("class", "text")
        .attr("data-weight", function(d) { return d.weight; })
      .text(function(d) { return d.name });
​
  // Now, set the rect width based on title length 
  node.selectAll("rect")
      .attr("width", function(d) {
            var txtWidth = this.parentNode.children[2].getComputedTextLength();
        return Math.floor(txtWidth + 15);
            });
  
  node.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("transform", function(d) { 
      if (d.index == 0) {
        d.x = 500;
        d.y = 500;
      }
      return "translate(" + d.x + "," + d.y + ")";
    });
    
  });
});
​
</script>
​
    