visfest block visualization

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    svg { width: 100%; height: 100%; }
  </style>
</head>

<body>
  <script>
    var margin = {top: 20, right: 10, bottom: 20, left: 10};
    var width = 960 - margin.left - margin.right;
    var height = 500 - margin.top - margin.bottom;
    var svg = d3.select("body").append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.json('data.json', function(data) {
      var api = _.chain(data)
      	.pluck('api')
      	.map(function(api) {return _.pairs(api)})
      	.flatten().compact()
      	.filter(function(api) {return !_.contains(ignoreApi, api[0])})
      	.reduce(function(memo, api) {
          if (!memo[api[0]]) {
            memo[api[0]] = 0;
          }
          memo[api[0]] += api[1];
          return memo;
        }, {})
      	.value();
      var colors = d3.scale.category20();
      var sizeScale = d3.scale.linear()
      	.domain([_.min(api), _.max(api)])
      	.range([7.5, 20]);
     	var apiNodes = _.map(api, function(count, name) {
        api[name] = {
          name,
          size: sizeScale(count),
          fill: colors(name),
          type: 'api'
        };
        return api[name];
      });
      var blockNodes = _.map(data, function(block) {
        var node = {
          id: block.id,
          title: block.description,
          user: block.userId,
          image: block.thumbnail,
          size: 10,
          stroke: '#999'
        };
        _.each(block.api, function(count, apiName) {
          if (_.contains(ignoreApi, apiName)) return;
          links.push({
            source: node,
            target: api[apiName],
            size: count
          });
        });

return node;
      });
      
      nodes = _.union(apiNodes, blockNodes);
      force.nodes(nodes).links(links)
      	.start();
      console.log(data, apiNodes, links);
      
      enter();
    });
  </script>
</body>

https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.1/lodash.min.js

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js