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 (£129) commercial license available.

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The lineTo function

The lineTo function is used whilst drawing paths to the canvas to move the 'pen' to a new set of coordinates and drawing a line to the new coordinates. Nothing is actually drawn to the canvas until you call the stroke or fill functions. The color of the line is controlled by setting the strokeStyle property and the width of the line by the lineWidth property.

Note that only the destination X/Y coordinates are given to this function - the start X/Y coordinates are the endpoint of the last drawing operation (eg a moveTo or bezierCurveTo operation).

Arguments to the function

An example

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

        context.moveTo(100, 100);
        context.lineTo(200, 200);