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Re: Polygon with holes

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  • Subject: [mg97406] Re: Polygon with holes
  • From: Harrie Kraai <hakraai at>
  • Date: Thu, 12 Mar 2009 05:42:50 -0500 (EST)
  • References: <> <gp7vr4$1bn$>

Thanks Frank, I was not aware of this library.
Now I know how to compute the polygons. But how do I render them in 


Frank Scherbaum wrote:
> HK
> Am 10.03.2009 um 11:34 schrieb Harrie Kraai:
>> Hi group,
>> Does anyone know of a facility for Polygons (graphics) with holes  
>> inside?
>> I guess there is no such thing as an oriented polygon in Mathematica?
>> Or a polygon consisting of disjoint lines (inner and outer contours,
>> clockwise and counterclockwise)?
>> I can see that it is possible to connect outer and inner contours  
>> using
>> a dummy line, but that is not so easy to program in a generic way.
>> Solutions such as creating an artificial hole by another Polygon in  
>> the
>> background colour are not really acceptable.
>> Polygon's with holes would be very useful for maps etc.
>> Sincerely
>> HK
>> general
> you may find the general polygon clipping library of interest for your  
> purpose. It can deal with polygons with holes.
> Cheers,
> Frank

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