D3 Examples - Force-Directed Edge Severing

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
.node, .link {
  stroke: #bbb;
  stroke-width: 1.5px;
  stroke-opacity: 0.6;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
var severs = [
  ["Fantine", 700],
  ["Tholomyes", 1400],
  ["Valjean", 2100],
  ["Javert", 3000],
  ["Gavroche", 4200],
  ["Marius", 4200],
  ["Mabeuf", 4800],
  ["Courfeyrac", 5000],
  ["Enjolras", 5200],
  ["Mme.Thenardier", 6500],
  ["Cosette", 7300],
  ["Pontmercy", 8600],
];
​
var nodes,
    links;
​
var width = 960,
    height = 500;
​
var color = d3.scale.category20();
​
var force = d3.layout.force()
    .charge(-40)
    .gravity(0.2)
    .linkDistance(20)
    .size([width, height]);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("miserables.json", function(error, graph) {
  nodes = graph.nodes;
  links = graph.links;
​
  force
      .nodes(nodes)
      .links(links)
      .start();
​
  var link = svg.selectAll(".link")
      .data(links)
    .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });
​
  var node = svg.selectAll(".node")
      .data(nodes)
    .enter().append("circle")
      .attr("class", "node")
      .attr("r", 5)
      .style("fill", function(d) { return color(d.group); })
      .call(force.drag);
​
  node.append("title")
      .text(function(d) { return d.name; });
​
  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; });
  });
​
  function update() {
    force
      .nodes(nodes)
      .links(links);
    node.data(nodes)
     .exit().remove();
    link.data(links)
      .exit().remove();
  };
​
  severs.forEach(function(sever) {
    var name = sever[0];
    var time = sever[1];
      
    setTimeout(function() {
      links = links.filter(function(d) {
        return d.target.name !== name
            && d.source.name !== name;
      });
​
      update();
      force.start();
    }, time);
  });
});
​
</script>
​
    