.net Powerful JavaScript charts
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 use for showing charts on your website.

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Get the latest version of RGraph (version 6.18, 1st June 2024) from the download page. You can read the changelog here. There's also older versions available, minified files and links to 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 (£129) 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