A Donut chart with a 3D look using gradients

Here we have a donut chart (which is itself a Pie chart with the variant option set to donut) which has had the colors manipulated (to a gradient) in order to give a 3D appearance to the donut. It also has a slight shadow to give it an extra bit of depth. And it uses the roundRobin animation effect along with segment separation (the exploded option).

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.pie.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="475" height="350">
    [No canvas support]
This is the code that generates the chart:
    new RGraph.Pie({
        id: 'cvs',
        data: [41,37,16,3,3],
        options: {
            colors: [
            variant: 'donut',
            linewidth: 5,
            exploded: 5,
            strokestyle: 'rgba(0,0,0,0)',
            align: 'left',
            shadow: true,
            shadowOffsetx: 2,
            shadowOffsety: 2,
            shadowBlur: 30,
            centerx: 185