D3 Examples - Concentric rings with pie layout

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
  <style>
 
    svg { width: 100%; height: 100%; }
  
    body {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin: auto;
  position: relative;
  width: 960px;
}
​
text {
  font: 10px sans-serif;
}
​
form {
  position: absolute;
  right: 10px;
  top: 10px;
}
  
  </style>
</head>
​
<body>
  <script>
  
  // could make array of event data with each event a length of one and intervals the length of intervals?
  var dataset = {
  apples: [10, 6, 8, 6, 4, 1],
  oranges: [10, 6, 8, 6, 4 ,1],
  lemons: [10, 6, 8, 6, 4, 1],
  pears: [10, 6, 8, 6, 4,1],
  pineapples: [10, 6, 8, 6,4,1],
};
​
var width = 460,
    height = 300,
    cwidth = 25;
​
var color = d3.scale.category20();
​
var pie = d3.layout.pie()
    .sort(null);
​
var arc = d3.svg.arc();
 
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
​
var gs = svg.selectAll("g").data(d3.values(dataset)).enter().append("g");
var path = gs.selectAll("path")
    .data(function(d) { return pie(d); })
    .enter().append("path")
    .attr("fill", function(d, i) { return color(i); })
    .attr("d", function(d, i, j) { return arc.innerRadius(10+cwidth*j).outerRadius(cwidth*(j+1))(d); })
;
​
  
  
  </script>
</body>
​
    