CGAL users discussion list

[Kien Kieu <>]

By the complement, I mean the region of the plane outside the polygon.

As noticed by Andreas, you can use directly inset_polygon_2.

Asher Kamiraze 
<>
 a écrit :

> Thanks for all your answers. Since I need a coarse approximation of the
> erosion, your propositions seem great.
> A few questions:
>
> 1) Fernando, you point the Straight Skeleton and Polygon Offseting package.
> It seems to fit my needs. Is it equivalent to an erosion with a circular
> structuring element?
> 2) Eric, you suggest to compute an inset. Is it also equivalent to an
> erosion with a circular structuring element?
> 3) Kiên, could you explain what is the complement of a polygon?
>
> Best,
>
> Asher
>
> 2010/2/5 Kien Kieu 
> <>
>
> > I have never practiced dilatation or erosion with CGAL. But here is a
> > suggestion: you could first compute the complement of your polygon and then
> > dilate the complement.
> >
> > Asher Kamiraze 
> > <>
> >  a écrit :
> >
> >  Dear list,
> > > I want to erode a polygon with a polygonal structuring element. I had a
> > > look
> > > at the 2D Minkowski sums package, but it seems to only provide dilatation.
> > > Is there a way to erode a polygon with CGAL ?
> > >
> > > Best,
> > >
> > > Asher
> > >
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--
Kiên Kiêu                    tel  : + 33 (0)1 34 65 28 16
Unité MIA, INRA              fax  : + 33 (0)1 34 65 22 17
Domaine de Vilvert           email: 

F-78352 Jouy-en-Josas Cedex  url  : http://www.jouy.inra.fr/mia