Here’s some sample code provided by Erica Sadun via Apple on the iphone-sdk list that was worked up to do the job of updating gesture-driven transformations on the fly. If you’ve struggled with doing this kind of thing so as to make the consequences work out intuitively — and if you haven’t, it’s not quite as straightforward as you think! — there’s probably some good tips for you to be found picking through this. Enjoy!
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