D3 Examples - Metis Class 7, #1

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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>
    var width = 960;
    var height = 500;
    var radius = 5;
    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){
      //position each node with group
      var preRow = 4;
      data.nodes.forEach(function(node){
        node.focusX = (node.group % preRow) *100;
        node.focusY = 0;
      });
      console.log(data.nodes)
      
      var simulation = d3.forceSimulation(data.nodes)
        .force('center', d3.forceCenter(width/2, height/2))
        .force('attraction', d3.forceManyBody().strength(-5))
        //.force('collide', d3.forceCollide(radius + .5))
        .force('x', d3.forceX().x(function(d) {
         return d.focusX 
        }))
       .force('y', d3.forceY().y(function(d) {
         return d.focusY 
        }))
        .force('links',
              d3.forceLink(data.links).id(function(d)  {return d.id}))
        .on('tick', ticked);
      var links = svg.selectAll('line')
        .data(data.links, function(d) {return d.source.id + ',', d.target.id})
        .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)
        .attr('fill', function(d) {return colors(d.group)});
      
      
      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.source.y});
        
      }
      
    });
​
  </script>
</body>
​
    