CGAL users discussion list

[Tom Kazimiers <>]

Hi,

I played around with the "Adding handles" example which was very useful
to me, but one question could not be answered by myself:
In the mentioned example there is a custom Vertex class "My_vertex_base":

               template < class Gt, class Vb =
CGAL::Triangulation_vertex_base_2<Gt> >
               class My_vertex_base
                 : public  Vb
               ...

which is used in a triangulation as following:

               struct K :
CGAL::Exact_predicates_inexact_constructions_kernel {};

               typedef My_vertex_base<K> Vb;
               typedef CGAL::Triangulation_data_structure_2<Vb> Tds;
               typedef CGAL::Triangulation_2<K,Tds> Triangulation;

               typedef Triangulation::Vertex_handle Vertex_handle;

Well, besided that the rebinding is not clear to me in its full extent I
get this to work.
In the example there are some points added and one gets back a
"Vertex_handle".
Now, is it possible to "transform" this Vertex_handle in a
"My_vertex_base" ? I see that Vertex_handle has the added methods in
My_vertex_base, but still has another type. The thing is I want to get
back "My_vertex_base" instances from the triangulation, can this be done?

Thanks in advance and for your patience :)
Tom


Tom Kazimiers schrieb:
> Daniel,
>
> thanks for your reply. Your link is what I am looking for :)
> I realized that I indeed need a delaunay triangulation and not its dual,
> the voronoi diagram, so the manual helps alot.
>
> Thanks,
> Tom
>
> 
>  schrieb:
>   
>>> Ideally I would like to get back a type of mine (which should extend
>>> Vertex_handle I guess) in which I could attach some information to a 
>>> vertex in
>>> the diagram. Is there a way to achive this? It would be really nice if 
>>> you 
>>> could point me in the right direction.
>>>     
>>>       
>> This section of the manual was very helpful in my case:
>>
>> 29.11   Flexibility: Using Customized Vertices and Faces
>>
>> http://www.cgal.org/Manual/3.4/doc_html/cgal_manual/Triangulation_2/Chapter_main.html#Section_29.11
>>
>> See the example "Adding colors".
>>
>> Best,
>>
>> Daniel
>>
>>
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>
>