CGAL users discussion list

[Andreas Fabri <>]

Hello,

Note that the 2D Minkowski Sum package offers offset AND inset.
For the latter here is the reference manual page
http://www.cgal.org/Manual/last/doc_html/cgal_manual/Minkowski_sum_2_ref/Function_inset_polygon_2.html#Cross_link_anchor_1035

Best regards,

andreas

On 05/02/2010 20:07, Asher Kamiraze wrote:
> 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 
> <
>  
> <mailto:>>
>
>     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 
> <
>     
> <mailto:>>
>  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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