About
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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Download
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 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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The putImageData function

The putImageData function allows you to add an ImageData object that you have been manipulating back onto the canvas. You pass the function the ImageData object and the X/Y coordinates of where you want it placed. Optionally you can specify which portion of the ImageData object to use.

Arguments to the function

An example

<script>
    window.onload = function ()
    {
        var canvas = document.getElementById('cvs');
        var context = canvas.getContext('2d');
        
        // Copies an ImageData object onto the canvas
        context.putImageData(imgData);
    }
</script>

See also