Convex Hull reading XY co-ords in Python [closed]

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I need to come up with a convex hull algorithm t开发者_C百科o read through a bunch of X , Y co-ordinates and outline the image.. i'm coding in python Any ideas?

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Are there any more details or constraints to your question? After searching wikipedia for "Convex hull algorithms", it gave me a list of algorithms, of which I clicked "Monotone Chain" http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain