D3 Examples - D3v4 Force Layout with Covex Hull

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}
​
.nodes circle {
  stroke: #fff;
  stroke-width: 1.5px;
}
​
.hull {
  fill: lightgreen;
  stroke: steelblue;
  stroke-width: 2px;
  stroke-linejoin: round;
}
​
</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
​
var color = d3.scaleOrdinal(d3.schemeCategory20);
​
var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));
    
var convexHull = svg.append("path")
  .attr("class",'hull');
​
d3.json("miserables.json", function(error, graph) {
  if (error) throw error;
​
  var link = svg.append("g")
      .attr("class", "links")
    .selectAll("line")
    .data(graph.links)
    .enter().append("line")
      .attr("stroke-width", function(d) { return Math.sqrt(d.value); });
​
  var node = svg.append("g")
      .attr("class", "nodes")
    .selectAll("circle")
    .data(graph.nodes)
    .enter().append("circle")
      .attr("r", 5)
      .attr("fill", function(d) { return color(d.group); });
​
  node.append("title")
      .text(function(d) { return d.id; });
​
  simulation
      .nodes(graph.nodes)
      .on("tick", ticked);
​
  simulation.force("link")
      .links(graph.links);
      
      
  function ticked() {
    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; });
        
    var hull = d3.polygonHull(node.data().map(function(d) { return [d.x,d.y]; }) ); 
    
    convexHull.datum(hull).attr("d", function(d) { return "M" + d.join("L") + "Z"; });
        
        
  }
});
​
​
​
</script>
​
    