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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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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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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The setLineDash function

The setLineDash function is used to set the current lineDash setting. The argument that you give to the function should be an array that contains numbers that indicate the desired dash setting, starting with a dash.

Arguments to the function

An example

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

        // context.setLineDash([1,0]); // A solid line
        // context.setLineDash([3,6]); // A wide gap
        // context.setLineDash([15,5,5,3]); // A pattern starting with a wide dash
        context.arc(125,125,50,0,2 * Math.PI, false);

See also