graphics - How to offset a cubic bezier curve?

Question

I'm trying to create a "parrallel" bezier curve. In my attempts I've gotten close but no cigar. I'm trying to keep a solid 1px offset between the 2 curves (red,blue).

My main goal is use a edge offseting algorythm to expand/shrink a svg path.

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Solution

For anyone else who is looking for a solution, I've create a AS3 version.

http://seant23.wordpress.com/2010/11/12/offset-bezier-curves/

Answer 1

I hope you found my math paper useful

Quadratic bezier offsetting with selective subdivision https://microbians.com/mathcode