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Re: Polygon with holes

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97387] Re: Polygon with holes
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Thu, 12 Mar 2009 02:19:34 -0500 (EST)
  • References: <gp5fn9$9mc$1@smc.vnet.net>

In the documentation of Polygon:

Polygons in 2D and 3D can be non-convex, and can intersect themselves.
Self-intersecting polygons are filled according to an even-odd rule
that alternates between filling and not at each crossing.

Cheers -- Sjoerd

On Mar 10, 12:34 pm, Harrie Kraai <hakr... at xs4all.nl> wrote:
> 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



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