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MathGroup Archive 2001

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Re: Point order

  • To: mathgroup at smc.vnet.net
  • Subject: [mg30383] Re: [mg30347] Point order
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Tue, 14 Aug 2001 03:45:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

>Hello all,
>If I draw a polygone of n sides, how do I know if the points are drawn
>in clockwise order or not?
>Thanks
>Rafael

Rafael,

the function CCWOrientedQ[{v1,v2,...}] in
http://www.mathsource.com/Content/Enhancements/Geometry/0211-497
takes a simple polygon with vertices {v1,v2,...} and returns True
iff the list {v1,v2,...} is counterclockwise oriented.

Adriano Pascoletti


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