Complex gestures on the iPhone

Is there a high level library that handles complex gestures l ike detecting开发者_如何学C triangles / loops / circles? Is it even possible to build such a library with what Apple already has?

Thanks,

Teja

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You can use a "Dollar Recognizer"... its pretty accurate and very easy to use from a single training template. There is even an effort started for an iPhone implementation, although its not been released yet. An implementation is being used by AlphaCount.