An adjustable (black) Meter chart

This goes in the documents header:

<script src="RGraph.common.core.js"></script>
<script src="RGraph.common.dynamic.js"></script>
<script src="RGraph.meter.js"></script>

Put this where you want the chart to show up:

<canvas id="cvs" width="600" height="500" style="background-color: black; border-radius: 15px; box-shadow:3px 3px 3px gray">
    [No canvas support]
</canvas>

This is the code that generates the chart:

<script>
    window.onload = function ()
    {
        var meter = new RGraph.Meter({
            id: 'cvs',
            min: 0,
            max: 100,
            value: 75,
            options: {
                backgroundColor: 'black',
                anglesStart: RGraph.PI - 0.55,
                anglesEnd: RGraph.TWOPI + 0.5,
                centery: 300,
                textSize: 22,
                textColor: 'white',
                textValign: 'bottom',
                greenColor: '#0a0',
                segmentRadiusStart: 175,
                border: 0,
                tickmarksSmallNum: 0,
                tickmarksBigNum: 0,
                needleRadius: 250,
                needleColor: '#ddd',
                centerpinStroke: 'black',
                centerpinFill: '#ddd',
                textAccessible: false
            }
        }).on('beforedraw', function (obj)
        {
            RGraph.clear(obj.canvas, 'black');
        }).draw()

        meter.canvas.onclick = function (e)
        {
            var newvalue = meter.getValue(e);
            
            meter.value = newvalue;
            meter.grow();
        }
    };
</script>

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