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.net Powerful JavaScript charts
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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 16 years old) and has a wealth of features making it an ideal choice to use for showing charts on your website.

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Get the latest version of RGraph (version 6.20, 1st December 2024) from the download page. You can read the changelog here. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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License
RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£129) commercial license available.

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HOWTO: Create a bank of Gauge charts

Now that RGraph supports multiple charts on a single canvas creating a bank of Gauge charts or other meters is a simple matter and allows you to create powerful responsive control panels.

This example uses the Gauge chart though the principle is the same for all types of RGraph meter.

The original Gauge charts

These are the original Gauge charts before they have been made adjustable.

[No canvas support] 
<script>
    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:67,
        options: {
            centerx: 100,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()

    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:45,
        options: {
            centerx: 300
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()

    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:13,
        options: {
            centerx: 500
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()
</script>

The Gauge charts now that they're adjustable

These are the Gauge charts now that they have been made adjustable.

[No canvas support] 
<script>
    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:67,
        options: {
            centerx: 100,
            adjustable: true,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()

    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:45,
        options: {
            centerx: 300,
            adjustable: true,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()


    new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:13,
        options: {
            centerx: 500,
            adjustable: true,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()
</script>

Making the Gauge charts animated

By default, the Gauge charts aren't animated when they're adjustable, however, this is a simple addition and involves handling the adjusting yourself.

[No canvas support] 
<script>
    myGauge1 = new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:67,
        options: {
            centerx: 100,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw();

    myGauge2 = new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:45,
        options: {
            centerx: 300,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw();

    myGauge3 = new RGraph.Gauge({
        id: 'cvs',
        min: 0,
        max: 100,
        value:13,
        options: {
            centerx: 500,
            marginLeft: 15,
            marginRight: 15,
            marginTop: 15,
            marginBottom: 15
        }
    }).draw()

    
    // You only need to add the custom event listener once
    myGauge1.canvas.onmousedown = function (e)
    {
        var obj = RGraph.ObjectRegistry.getFirstObjectByXY(e);
        
        if (obj) {
            obj.value = obj.getValue(e);
            obj.grow();
        }
    }
</script>