.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 bezierCurveTo function

View example on CodePen
The bezierCurveTo function

Like the quadraticCurveTo function, the bezierCurveTo function can be used to add curves to your chart. It uses the existing pen position as the start point and then the first two coordinates as the first control point, the second two coordinates as the second control point and the last two coordinates that you give it as the endpoint. The curve that is drawn will not necessarily pass through the control points.

Arguments to the function

P0 is not specified on the bezierCurveTo function - this is done by a moveTo call before the bezierCurveTo call. As shown below.

An example

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

        // This is where the curve begins (P0)
        context.moveTo(10, 225);