D3 Examples - Learning the ropes

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<!DOCTYPE html>
  <meta charset="utf-8">
  <svg width="960" height="960" font-family="helvetica neue" font-size="10"</svg> 
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="d3-scale-radial.js"></script>
<style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
</style>
​
<script>
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    innerRadius = 180,
    outerRadius = Math.min(width, height) / 2,
    g = svg.append("g").attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
​
var x = d3.scaleBand()
    .range([0, 2 * Math.PI])
    .align(0);
​
var y = d3.scaleRadial()
    .range([innerRadius, outerRadius]);
​
var z = d3.scaleOrdinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
​
d3.csv("FauxData.csv", function(d, i, columns) {
  for (i = 1, t = 0; i < columns.length; ++i) t += d[columns[i]] = +d[columns[i]];
  d.total = t;
  return d;
    },function(error, data) {
  if (error) throw error;
​
  x.domain(data.map(function(d) { return d.State; }));
  y.domain([0, d3.max(data, function(d) { return d.total; })]);
  z.domain(data.columns.slice(1));
​
  g.append("g")
    .selectAll("g")
    .data(d3.stack().keys(data.columns.slice(1))(data))
    .enter().append("g")
      .attr("fill", function(d) { return z(d.key); })
    .selectAll("path")
    .data(function(d) { return d; })
    .enter().append("path")
      .attr("d", d3.arc()
          .innerRadius(function(d) { return y(d[0]); })
          .outerRadius(function(d) { return y(d[1]); })
          .startAngle(function(d) { return x(d.data.State); })
          .endAngle(function(d) { return x(d.data.State) + x.bandwidth(); })
          .padAngle(0.01)
          .padRadius(innerRadius));  
    </script>
​
    