Highlighting the Line chart

By using two lines - the second with a smaller linewidth than the first, but using the same values as the first - the second is drawn on top of the first.

This goes in the documents header:

<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.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>
    window.onload = function ()
    {
        var line = new RGraph.Line({
            id: 'cvs',
            data: [
                [4,5,3,8,null,9,6,5,3],
                [4,5,3,8,null,9,6,5,3]
            ],
            options: {
                labels: ['Mal', 'Barry', 'Gary', 'Neil', 'Kim', 'Pete', 'Lou', 'Fred', 'Jobe'],
                colors: ['black', 'white'],
                linewidth: [5,2],
                hmargin: 5,
                shadowOffsetx: 0,
                shadowOffsety: 0,
                shadowBlur: 15,
                tickmarks: null,
                textAccessible: true
            }
        }).draw();
    };
</script>