D3 Examples

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Without modifying the information in genes.json, use D3 to construct a pie chart that shows the relative fraction of genes in the forward and reverse directions. Your code must dynamically generate the pie chart from the data. In other words, if I modify the genes.json data file, the pie chart must update automatically. (15 points)

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Step 1 - A Basic Pie Chart</title>
    <link rel="stylesheet" href="normalize.css">
  </head>
  <body>
    <div id="chart"></div>
    <script src="d3.v3.min.js"></script>
    <script>
      (function(d3) {
        'use strict';
​
        var dataset = [
          { label: 'Abulia', count: 10 }, 
          { label: 'Betelgeuse', count: 20 },
          { label: 'Cantaloupe', count: 30 },
          { label: 'Dijkstra', count: 40 }
        ];
​
        var width = 360;
        var height = 360;
        var radius = Math.min(width, height) / 2;
​
        var color = d3.scale.category20b();
​
        var svg = d3.select('#chart')
          .append('svg')
          .attr('width', width)
          .attr('height', height)
          .append('g')
          .attr('transform', 'translate(' + (width / 2) + 
            ',' + (height / 2) + ')');
​
        var arc = d3.svg.arc()
          .outerRadius(radius);
​
        var pie = d3.layout.pie()
          .value(function(d) { return d.direction; })
          .sort(null);
​
        var path = svg.selectAll('path')
          .data(pie(genes))
          .enter()
          .append('path')
          .attr('d', arc)
          .attr('fill', function(d, i) { 
            return color(d.data.label);
          });
​
      })(window.d3);
    </script>
  </body>
</html>
​
    