A circular Meter chart

This is a customised Meter chart. The canvas is still the usual rectangle but it has ben placed inside a DIV which has a large border-radius CSS property giving the circular appearance.

Temperature (°C)

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="450" height="350">
    [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: 56,
            options: {
                border: false,
                tickmarksSmallNum: 0,
                tickmarksBigNum: 0,
                anglesStart: RGraph.HALFPI + (RGraph.HALFPI / 1.5),
                anglesEnd: RGraph.TWOPI + RGraph.HALFPI - (RGraph.HALFPI / 1.5),
                segmentRadiusStart: 140,
                textSize: 16,
                colorsRanges: [
                    [0,40,'Gradient(#0c0:#cfc:#0c0)'],
                    [40,80,'Gradient(yellow:#ffc:yellow)'],
                    [80,100,'Gradient(red:#fcc:red)']
                ],
                needlesRadius: 110,
                gutterBottom: 135
            }
        }).draw()
        
        meter.canvas.onclick = function (e)
        {
            var obj   = e.target.__object__;
            var value = obj.getValue(e);

            if (typeof value === 'number') {
                obj.value = value;
                obj.grow();
            }
        }
    };
</script>

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