Is there any existing Javascript APIs manipulate canvas / images more advance?

Sorry if this sounds childish. I have been trying to manipulate a canvas element (of HTML5) (eg. a long rectangle) by folding the edge, like you are folding a paper.

Is there an existing javascript APIs for this?开发者_如何学C Or any recommendation where to begin?

Thanks.

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I hope this helps:

https://github.com/mrdoob/three.js/

A Javascript 3d engine

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I'm unaware of any specific framework or general purpose library for this sort of thing, but you might want to look at this: http://jpageflipper.codeplex.com/.