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 shadowBlur property

This sets the amount of blurring that the shadow has. In conjunction with the clip function and setting the offset X/Y values to zero you can achieve inner shadows:


An example

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

        var x       = 50;
        var y       = 50;
        var width   = 100;
        var height  = 100;
    
        context.shadowColor = '#ccc';
        context.shadowOffsetX = 3;
        context.shadowOffsetY = 3;
        context.shadowBlur = 25;
    
        context.fillStyle = 'red';    
        context.fillRect(x, y, width, height);
    }
</script>