A basic example of the drawing API marker3 object

[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.drawing.marker2.js"></script>
<script src="RGraph.line.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>
    var line = new RGraph.Line({
        id: 'cvs',
        data: [5,8,6,4,3,5,2],
        options: {
            hmargin: 5,
            xaxisLabels: ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']
        }
    }).draw()   
    
    var coords = line.coords[2];
    
    var marker2 = new RGraph.Drawing.Marker2({
        id: 'cvs',
        x: line.coords[4][0],
        y: line.coords[4][1],
        text: 'Friday dip in activity',
        options: {
            tooltips: ['Lou'],
            align: 'left',
            textAccessiblePointerevents: false
        }
    }).draw();
</script>