Banded Arcs by mbostock

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>

path {
  fill: lightsteelblue;
  stroke: steelblue;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var data = d3.range(20);

var angle = d3.scale.ordinal()
    .domain(data)
    .rangeBands([0, 2 * Math.PI]);

d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
  .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
  .selectAll("path")
    .data(data)
  .enter().append("path")
    .attr("d", d3.svg.arc()
        .innerRadius(height / 2 - 20)
        .outerRadius(height / 2 - 10)
        .startAngle(function(d) { return angle(d); })
        .endAngle(function(d) { return angle(d) + angle.rangeBand() / 2; }));

</script>