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Re: [cgal-discuss] Minowski sum for non-polygons?


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  • From: Efi Fogel <>
  • To:
  • Subject: Re: [cgal-discuss] Minowski sum for non-polygons?
  • Date: Thu, 22 Dec 2016 09:51:08 +0200
  • Authentication-results: mail3-smtp-sop.national.inria.fr; spf=None ; spf=Pass ; spf=None
  • Ironport-phdr: 9a23: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
You need to provide a degenerate polygon of zero area, so you you start with the polyline itself, and then provide it again in reverse order without the first and last.

   ____  _        ____             _
  /_____/_) o    /__________  __  //
 (____ (   (    (    (_/ (_/-(-'_(/
                         _/



On Wed, Dec 21, 2016 at 9:59 PM, KHartmann <> wrote:
Thanks Efi.

I tried using CGAL::approximated_offset_2().

But I can't figure out how to pass it a polyline instead of a polygon.

I create my polygon_2 by push_back()ing vertices.  But cgal always assumes
that
the polygon boundary is closed.  I don't know how to tell cgal that the
polygon_2 boundary isn't closed.





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