CGAL users discussion list

[Asher Kamiraze <>]

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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