Copyright 2006 Google Inc.
Firefox, Safari and Opera 9 support the canvas tag to allow 2D command-based drawing operations. ExplorerCanvas brings the same functionality to Internet Explorer 8 and older; web developers only need to include a single script tag in their existing canvas webpages to enable this support.
Place the ExplorerCanvas source file excanvas.js in the same directory as your HTML files.
The excanvas.js file must be included in the page before any occurrences of canvas elements in the markup. This is due to limitations in IE and we need to do our magic before IE sees any instance of <canvas> in the markup. It is recommended to put it in the head. More on "Can I use the HTML5 canvas element?".
<head>
<!--[if lte IE 8]><script src="excanvas.js"></script><![endif]-->
</head>
If you have created your canvas element dynamically it will not have the getContext method added to the element. To get it working you need to call initElement on the G_vmlCanvasManager object.
var el = document.createElement('canvas');
G_vmlCanvasManager.initElement(el);
var ctx = el.getContext('2d');
Thats it. Now you can use the HTML5 spec for Canvas as your reference.
If you run into trouble, please look at the included example code to see how to best implement this.
In the case you found a bug or have a enhancement proposal, please create an issue, or if you need help about using the library, please go and read the mailing list.
Before we can accept a patch from you, you must sign a Contributor License Agreement (CLA). The CLA protects you and us.
- If you are an individual writing original source code that you wish to contribute to ExplorerCanvas and you are sure you own the intellectual property, then you'll need to sign an individual CLA.
- If you work for a company that wants to allow you to contribute your work to ExplorerCanvas, then you will need to sign a corporate CLA.
Follow either of the two links above to access the appropriate CLA and instructions for how to sign and return it.
Copyright 2008 Google Inc. This work is licensed under a Apache License 2.0