Find the direction of a polygon!

Hi all,
Thanx all for ur time advance.
I am looking for an algorithm to find out the direction of a polygon having 'n' vertices-- Means is it clock-wise of anti clock-wise!
And I would like to get some explanation on that rather than just a code..
Anyone has any idea... please..
Thanx again in advance
Anvar.

You can use the cross product to determine which way a given angle p0p1p2 turns. You simply check wether directed segment p0p2 is clockwise or counterclockwise relative to directed segment p0p1. To do this you compute the cross product (p2-p0)x(p1-p0). If the sign of this product is negative, then p0p2 is counterclockwise with respect to p0p1, and therefore we make a left turn at p1. A positive cross product indicates a clockwise orientation and a right turn. A cross product of zero means that point p0, p1 and p2 are collinear.

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