A basic Pie chart

[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.tooltips.js"></script>
<script src="RGraph.pie.js"></script>
Put this where you want the chart to show up: 
<canvas id="cvs" width="350" height="250">
    [No canvas support]
</canvas>
This is the code that generates the chart: 
<script>
    var labels = ['Monday', 'Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday'];

    new RGraph.Pie({
        id: 'cvs',
        data: [20,1,1,1,1,1,1],
        options: {
            tooltips: labels,
            labels: labels,
            labelsSticksList: true,
            shadow: false,
            strokestyle: 'rgba(0,0,0,0)',
            exploded: 0
        }
    }).roundRobin();
</script>