D3 Examples - Pie Chart

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
 #chart {                                                          
        height: 360px;
        position: fixed;
        width: 360px;
      }    
  
body {
  font: 10px sans-serif;
}
​
.arc path {
  stroke: #fff;
  stroke-width: 10;
}
         
</style>
<body>
  <div id="chart"></div>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var width = 960,
    height = 500,
    radius = Math.min(width, height) / 2;
​
var color = d3.scale.ordinal()
    .range(["#275785", "#356393", "#4677a8", "#6193c0", "#70a3cb", "#7eb0d7",   "#9ac7e5", "#a3ceea", "b8ddf2"]);
​
        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 - 30)
/*This line determines wether it is a pie or a donut */
        .innerRadius(radius-100); /*.innerRadius(radius - x) for donut */
​
var pie = d3.layout.pie()
    .sort(null)
    .value(function(d) { return d.Count; });
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
​
d3.csv("data.csv", function(error, data) {
​
  data.forEach(function(d) {
    d.Count = +d.Count;
  });
​
  var g = svg.selectAll(".arc")
      .data(pie(data))
    .enter().append("g")
      .attr("class", "arc");
 
  var path = svg.selectAll('path')
  g.append("path")
      .attr("d", arc)
      .style("fill", function(d) { return color(d.data.Size); });
  
  g.append("text")
      .attr("transform", function(d) { 
        return "translate(" + ( (radius - 12) * Math.sin( ((d.endAngle - d.startAngle) / 2) + d.startAngle ) ) + "," + ( -1 * (radius - 12) * Math.cos( ((d.endAngle - d.startAngle) / 2) + d.startAngle ) ) + ")"; })
      .attr("dy", ".em")
      .style("text-anchor", function(d) {
        var rads = ((d.endAngle - d.startAngle) / 2) + d.startAngle;
        if ( (rads > 7 * Math.PI / 4 && rads < Math.PI / 4) || (rads > 3 * Math.PI / 4 && rads < 5 * Math.PI / 4) ) {
          return "middle";
        } else if (rads >= Math.PI / 4 && rads <= 3 * Math.PI / 4) {
          return "start";
        } else if (rads >= 5 * Math.PI / 4 && rads <= 7 * Math.PI / 4) {
          return "end";
        } else {
          return "middle";
        }
      })
      .text(function(d) { 
        return d.data.Size});
​
      g.append("text")
      .attr("transform", function(d) { 
        return "translate(" + ( (radius - 12) * Math.sin( ((d.endAngle - d.startAngle) / 2) + d.startAngle ) ) + "," + ( -1 * (radius - 12) * Math.cos( ((d.endAngle - d.startAngle) / 2) + d.startAngle ) ) + ")"; })
      .attr("dy", "1.5em")
      .style("text-anchor", function(d) {
        var rads = ((d.endAngle - d.startAngle) / 2) + d.startAngle;
        if ( (rads > 7 * Math.PI / 4 && rads < Math.PI / 4) || (rads > 3 * Math.PI / 4 && rads < 5 * Math.PI / 4) ) {
          return "middle";
        } else if (rads >= Math.PI / 4 && rads <= 3 * Math.PI / 4) {
          return "start";
        } else if (rads >= 5 * Math.PI / 4 && rads <= 7 * Math.PI / 4) {
          return "end";
        } else {
          return "middle";
        }
      })
      .text(function(d) { 
        return d.data.Count});
​
});
​
</script>
    