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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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Get the latest version of RGraph (version 6.16) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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The lineDashOffset property

The lineDashOffset option is an array property, that is used to set the pattern of the lineDash when drawing lines. For example, you can use this setting to make a dotted line or a spaced-out dash pattern. By increasing this property over time, you can also create an animation effect.


An example

<script>
    window.onload = function ()
    {
        var canvas  = document.getElementById("cvs");
        var context = canvas.getContext('2d');

        context.lineDashOffset = 3;
        context.setLineDash([3,6]);
        context.beginPath();
        context.arc(125,125,50,0,2 * Math.PI, false);
        context.stroke();
    }
</script>

See also