CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Right, I had a issue with my path.
I checked again and the polygon is valid.
However, I could call create_interior_straight_skeleton and
create_exterior_straight_skeleton_2 with no error.

I looked at the sfcgal code to use the exact same calls they were doing
and I had no issue.

You can try it yourself:

https://gist.github.com/sloriot/29b613a7180f43ec01827fe70d095dca

Sebastien.


On 08/30/2016 08:07 PM, Marcos Dione wrote:
> On Tue, Aug 30, 2016 at 05:28:20PM +0200, Sebastien Loriot (GeometryFactory) 
> wrote:
> > Expr: aPoly.is_simple() || !"The input polygon is not simple."
> > File: include/CGAL/create_straight_skeleton_2.h
>
>      python-shapely[1], which is built on top of GEOS, just like PostGIS[3],
> disagrees:
>
> In [1]: import shapely.wkt
>
> In [2]: s= open('121897178.wkt').read()
>
> In [3]: sh= shapely.wkt.loads(s)
>
> In [4]: sh.is_simple
> Out[4]: True
>
>      A visual inspection of the feature does not reveal any crossing of
> its (only) polygon, but the lines are really close. i see that CGAL does
> not use any external lib for its internal representation, maybe the bug
> is around there? Or, most probably, I'm making a mistake at some point.
>
>      Cheers,
>
>         -- Marcos.
>
> --
> [1] http://toblerity.org/shapely/manual.html
>
> [2] https://trac.osgeo.org/geos/
>
> [3] 
> http://postgis.net/docs/manual-2.2/postgis_installation.html#install_requirements