A Bar chart with a rotating background

This is the single canvas version of this demo that only uses a single canvas. The background rotates and the Bar chart is drawn on top. Because of the constant updating it's not conducive to interactive features - for that you'll want the two canvas version .

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.bar.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="750" height="250">[No canvas support]</canvas>
This is the code that generates the chart: