An example of a Radial Scatter chart with an interactive key

The interactive key has been reimplemented as of June 2013 and added to more chart types.

[No canvas support]

This goes in the documents header:
<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.common.key.js"></script>
<script src="RGraph.drawing.rect.js"></script>
<script src="RGraph.bar.js"></script>
Put this where you want the chart to show up:
<canvas id="cvs" width="500" height="450">
    [No canvas support]
</canvas>
This is the code that generates the chart:
<script>
    data1 = [[45,51,'green'],[45,46,'green'],[45,35,'green']],
    data2 = [[225,32,'red'],[225,25,'red'],[225,12,'red']],
    data3 = [[315,13,'pink'],[315,26,'pink'],[315,36,'pink']]

    new RGraph.RScatter({
        id: 'cvs',
        data: [data1, data2, data3],
        options: {
            key: ['Richard','Dave','Charles'],
            keyInteractive: true,
            keyColors: ['green','red','pink'],
            keyMargin: 5,
            keyLabelsAxes: 'n'
        }
    }).draw();
</script>