Here is a simple Rose chart that uses the new easy gradient syntax for colors:
Gradient(white:red)
<script src="RGraph.common.core.js"></script> <script src="RGraph.rose.js"></script>Put this where you want the chart to show up:
<canvas id="cvs" width="500" height="500">
[No canvas support]
</canvas>
This is the code that generates the chart: