D3 Examples - Force layout

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
var margin = {top:20, bottom:20, left:20, right:20};
var width = 600 - margin.left - margin.right;
var height = 400 - margin.top - margin.bottom;
var radius =  25;
var colors = d3.scaleOrdinal(d3.schemeCategory10);  
    
var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
​
d3.json('miserables.json', function(err,data){
  data.nodes.forEach(function(node){
    var perRow = 4
    node.focusX = width/2;
    node.focusY = height/2;
  });
//   console.log(data.links)
​
        
  
  var simulation = d3.forceSimulation(data.nodes)
        .force('center', d3.forceCenter(width/2, height/2)) 
        .force('collide', d3.forceCollide(radius+45))
    .force('y', d3.forceY(height/2))
  .force('links', d3.forceLink(data.links).id(function(d){return d.id}))
  .on('tick', ticked);
​
 var links = svg.selectAll("line")
        .data(data.links)
        .enter().append('line')
        .attr('stroke','#ccc');
 var circles = svg.selectAll("circle")
    .data(data.nodes, function(d){return d.id})
    .enter().append("circle")
    .attr("r", radius*2.5)
​
  function ticked(){
    circles.attr('cx', function(d) {return d.x})
            .attr('cy', function (d) {return d.y})
    links.attr('x1', function(d){return d.source.x})
            .attr('x2', function(d) {return d.target.x})
            .attr('y1', function(d) {return d.source.y})
            .attr('y2', function(d) {return d.target.y})
    
  }
});
​
  </script>
</body>
​
    