A Bar chart that also uses the drawing API

This Bar chart shows a regular bar chart that also makes use of the drawing API to draw a label on the chart.

This goes in the documents header:

<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamics.js"></script>
<script src="RGraph.common.tooltips.js"></script>
<script src="RGraph.drawing.marker1.js"></script>
<script src="RGraph.bar.js"></script>

Put this where you want the chart to show up:

<canvas id="cvs" width="600" height="250">
    [No canvas support]
</canvas>

This is the code that generates the chart:

<script>
    window.onload = function ()
    {
        var bar = new RGraph.Bar({
            id: 'cvs',
            data: [4,8,5,3,2],
            options: {
                labels: ['Fred','John','James','Louis','Pete'],
                strokestyle: 'rgba(0,0,0,0)',
                textAccessible: true
            }
        }).draw();
        
        // Get the X/Y coordinates from the bar chart
        var idx = 2;
        var x   = bar.coords[idx][0] + (bar.coords[idx][2] / 2);
        var y   = bar.coords[idx][1];
        var r   = 15;

        marker = new RGraph.Drawing.Marker1({
            id: 'cvs',
            x: x,
            y: y,
            radius: r,
            text: 'A',
            options: {
                tooltips: ['James was the winner by a country mile.'],
                highlightFill: 'rgba(255,0,0,0.2)',
                textAccessible: true
            }
        }).draw();
    };
</script>