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 translate function

The translate function adjusts the coordinate system of the canvas. Normally the [0, 0] coordinates are in the top left corner, but by using the translate function you can move them to wherever you wish. To move things back and up the numbers can be negative. Translating is affected by the use of the save and restore functions so if necessary you can save, translate, restore - and the state of the canvas will be as it was before you saved.

Arguments to the function

An example

You can use the function like this:

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

        // After the translate the [0,0] coordinates will actually be 50 pixels down and 50
        // pixels to the right of where they would be normally
        context.translate(50, 50);
        context.moveTo(100, 100);
        context.lineTo(200, 200);