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    <p>Firefox's Canvas 2D contexts have (non-standard) mozCurrentTransform and mozCurrentTransformInverse properties.</p> <p>The WhatWG have now defined currentTransform and currentTransformInverse properties (the former even being writable). Here's the relevant part of the spec:</p> <p><a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#transformations" rel="nofollow">http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#transformations</a></p> <p>However these probably won't be universally implemented in browsers for some time yet, so if you want portability you will have to fall back to tracking the matrix manually as @Dave and @James say.</p> <p>Every man and his dog seems to have written such a Canvas-transform-matrix-tracker. I just had a look at @Dave Lawrence's one; I think mine is better in a few ways, even though I'm sure it's also inferior in other ways.</p> <ul> <li>Mine doesn't require any changes to user JS code - it modifies the Canvas and context prototypes, so you just add a script tag and you're good to go.</li> <li>It intercepts setting of the currentTransform property.</li> <li>It tries hard only to do what it needs to do.</li> </ul> <p>It works in latest Chrome and Firefox, but I haven't tested it in IE yet.</p> <p>I put mine in a jsfiddle, with a simple demonstration: <a href="http://jsfiddle.net/XmYqL/1/" rel="nofollow">http://jsfiddle.net/XmYqL/1/</a></p> <p>Here is a code block to placate stackoverflow so it lets me link to jsfiddle (??):</p> <pre><code>code, code, wonderful code </code></pre> <p>I finally got around to uploading my polyfill to GitHub:</p> <p><a href="https://github.com/supermattydomain/canvas.currentTransform.js" rel="nofollow">https://github.com/supermattydomain/canvas.currentTransform.js</a></p> <p>I know it's not perfect, but I'd really like to see us all work together on implementing One True Solution to this problem. I don't care if it's mine or someone else's. This corner of JavaScript/HTML5/Canvas is too much like the Balkans: a sea of partial solutions. Please, everybody, fork mine, add your changes and send me pull requests, or send me your URL so I can merge your code in, or replace mine wholesale with yours, or whatever. This is a stupid problem that I just want to nail. If we work together we can do it.</p>
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