CGAL users discussion list

[Evan S Behar <>]

Can you clarify what you mean by special cases? Are you referring to 
degenerate cases of the arrangement itself, or to functions such as 
insert_in_face_interior and insert_from_left_vertex, meaning that using 
CGAL::insert is safe and correct to use?

----- Original Message -----
From: Efi Fogel 
<>
Date: Sunday, January 6, 2013 2:39 am
Subject: Re: [cgal-discuss] Spherical Arrangement_on_surface_2

> Arrangement on the sphere is not formally supported. The code that 
> handlesthe general case has been generalized, but code that handles 
> special cases
> is still missing.
> In general the same guidelines that apply to arrangement in the 
> plane also
> applies to arrangement on the sphere.
> You can extend the curve either with *
> CGAL::Arr_curve_data_traits_2<Tr,XData,Mrg,CData,Cnv><http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2_ref/Class_Arr_curve_data_traits_2.html#Cross_link_anchor_1262>or
> with
> *
> *CGAL::Arr_consolidated_curve_data_traits_2<Traits,Data><http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2_ref/Class_Arr_consolidated_curve_data_traits_2.html#Cross_link_anchor_1263>
> *. You can extend an edge (more precisely, a halfedge)
> using*CGAL::Arr_extended_dcel<Traits,VData,HData,FData,V,H,F><http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2_ref/Class_Arr_extended_dcel.html#Cross_link_anchor_1216>
> *or the general technique described in Section
> Extending the 
> Dcel<http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Arrangement_on_surface_2/Chapter_main.html#Section_32.8>.There
>  are examples to do either.
> 
> 
> On Sat, Jan 5, 2013 at 11:16 PM, Evan S Behar 
> <>
>  wrote:
> 
> > Hello,
> >
> > I'm wondering if there's a straightforward way to modify the 
> arrangement> structure on a sphere such that the vertices/edges in 
> the arrangement have
> > additional information from the curves that are used to create them.
> > Essentially I am looking to add annotations to the arrangement.
> >
> > I would like to replace Curve_2 with a structure that has an 
> annotation> (e.g., a label) and have vertices/edges in the 
> arrangement keep a list of
> > the labels of the curves that pass through them, but I don't know 
> if there
> > is already a clear way to do this.
> >
> > Thanks,
> > Evan
> >
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