I'm looking for an algorithm to find bounding box (max/min points) of a closed quadratic bezier curve in Cartesian axis:

input: C (a closed bezier curve)
output: A B C D points

Image http://www.imagechicken.com/uploads/1270586513022388700.jpg

Note: above image shows a smooth curve. it could be not smooth. (have corners)

algorithm bezier
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