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 show charts on your website.

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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 (£99) commercial license available.

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Get the latest version of RGraph (version 6.16) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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The fillStyle property

The fillStyle option is a property, usually a string, that is used to set the color used to do filling on the canvas. For example the fillRect and fill functions both use this setting to determine the color that they use.

As well as a string it can be a canvas linear or radial gradient. More about these at the links below.


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.fillStyle = 'red';
        context.fillRect(x, y, width, height);
</script>

See also