CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

All vertices of a 2D CGAL triangulation are model of the concept
TriangulationVertexBase_2 described here:

http://www.cgal.org/Manual/last/doc_html/cgal_manual/Triangulation_2_ref/Concept_TriangulationVertexBase_2.html#Cross_link_anchor_1290

You will find documentation of methods point() and set_point(Point_2 p).

S.



Youssef ALJ wrote:
> Hi all,
>
> I'd like to know if there's any possibility for a given triangulation to 
> access to vertices' coordinates once this triangulation is constructed.
>
> Suppose we have the following code (from Geomview demo):
>
> #include <CGAL/Cartesian 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Kernel_23_ref/Class_Cartesian.html#Cross_link_anchor_1>.h>
> #include <CGAL/Triangulation_euclidean_traits_xy_3 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Triangulation_2_ref/Class_Triangulation_euclidean_traits_xy_3.html#Cross_link_anchor_947>.h>
> #include <CGAL/Delaunay_triangulation_2 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Triangulation_2_ref/Class_Delaunay_triangulation_2.html#Cross_link_anchor_930>.h>
> #include <fstream>
> #include <iostream>
>
>
> typedef CGAL::Cartesian 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Kernel_23_ref/Class_Cartesian.html#Cross_link_anchor_1><double
>  
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/NumberTypeSupport_ref/Class_double.html#Cross_link_anchor_582>>
>   K;
> typedef CGAL::Triangulation_euclidean_traits_xy_3<K> 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Triangulation_2_ref/Class_Triangulation_euclidean_traits_xy_3.html#Cross_link_anchor_947>
>  Gt3;
> typedef Gt3::Point Point3;
> typedef CGAL::Delaunay_triangulation_2 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/Triangulation_2_ref/Class_Delaunay_triangulation_2.html#Cross_link_anchor_930><Gt3>
>  Terrain;
>
>   
>
> int 
> <http://www.cgal.org/Manual/3.3/doc_html/cgal_manual/NumberTypeSupport_ref/Class_int.html#Cross_link_anchor_577>
>  main()
> {
>
>
> Terrain T;
>
>   std::ifstream iFile("data/points3", std::ios::in);
>   Point3 p;
>   while ( iFile >> p )
>   {   
>       T.insert( p );
>   }
>
> return 0;
>
> }
>
> Then i'd like to access to vertices' coordinates. The purpose is to 
> change the geometry of this triangulation (3D coordinates) without 
> changing its connectivity (how faces rely on each other). I didn't find 
> in Delaunay_triangulation_2 class any accessor to vertices. Could any 
> body tell me how to do it?
> Any suggestion is helpful.
>
> Regards,
> Youssef ALJ
>
>
>
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