CGAL users discussion list

[Mariette Yvinec <>]

push_back should be private too.
If you use push_back,
 the triangulation will be updated but not the alpha_shapes...

I don't see any problem in what you propose.

Le 19/05/11 12:46, Asher Kamiraze a écrit :
> Hi all,
>
> Is there a way to build an alpha_shape_2 with info? Something similar 
> to a triangulation with info.
> I have also noticed that insert() is private in alpha_shape_2, but, 
> push_back is not. Isn't it a problem?
>
> Here is what I am trying to do:
>
>
>     typedef CGAL::Exact_predicates_exact_constructions_kernel         
>               K;
>
>     struct vertex_info { Point point3d; };
>     struct face_info {};
>
>     typedef CGAL::Triangulation_vertex_base_with_info_2<vertex_info,K> 
>              Vb_2;
>     typedef 
> CGAL::Constrained_triangulation_face_base_with_info_2<face_info,K>     
>  Fb_2;
>
>     typedef CGAL::Alpha_shape_vertex_base_2<K, Vb_2> Vb;
>     typedef CGAL::Alpha_shape_face_base_2<K, Fb_2>  Fb;
>
>     typedef CGAL::Triangulation_data_structure_2<Vb,Fb>               
>           TDS_2;
>     typedef CGAL::Delaunay_triangulation_2<K  , TDS_2>                 
>              DT_2;
>
>     typedef CGAL::Alpha_shape_2<DT_2> Alpha_shape_2;
>
>
>             Alpha_shape_2 alpha_shape(0.5);
>             // How to insert points in alpha_shape with attached info?
>
> Hope you could help
>
> Best regards
>
> Asher

--
Mariette Yvinec
Geometrica project team
INRIA  Sophia-Antipolis