CGAL users discussion list

[Andreas Fabri <>]

On 09/05/2012 14:35, Sebastien Loriot (GeometryFactory) wrote:
> On 05/09/2012 02:21 PM, horstmann wrote:
> > Hi Sebastien,
> >
> > thanks for your fast and accurate answer.
> >
> > I'm still a bit confused whit the second parameter.
> >
> > > > - for each tetrahedron, the position of its four vertices (in ascending
> > > > order).
> > >
> > > Triangulation::Cell_handle cell=....
> > > cell->vertex(i).point(); //for i=0; i<4
> > > cf [2,3]
> >
> > When you say "Triangulation::Cell_handle cell=.... " What should I
> > assign to
> > 'cell'?
> >
> > I guess I need an iterator over finite_cells, don't I ?
> >
> > At this moment I'm doing this:
> >
> > typedef CGAL::Exact_predicates_inexact_constructions_kernel
> > K;
> > typedef CGAL::Triangulation_vertex_base_with_info_3<unsigned, K>
> > Vb;
> > typedef CGAL::Triangulation_data_structure_3<Vb>
> > Tds;
> > typedef CGAL::Triangulation_3<K, Tds>::Cell_handle Cell_handle;
> >
> > ................
> > ................
> > ................
> >
> > Cell_handle cell = ... ?? ;
> >
> > Delaunay::Finite_cells_iterator fit;
> >
> > for(fit = dt.finite_cells_begin() ; fit != dt.finite_cells_end() ; fit++,
> > i++)
> > for(i=0;i<4;i++)
> > cell->vertex(i).point();
> fit->vertex(i).point() will work.

Note that it is often helpful to look at the manual page of the
base class. As a Delaunay_triangulation_3 is a Triangulation_3
you find the types here:

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Triangulation_3_ref/Class_Triangulation_3.html#Cross_link_anchor_1363

together with the following sentence:

Iterators and circulators are convertible to the corresponding handles, 
thus the user can pass them directly as arguments to the functions.

andreas

> Sebastien.
>
> > Is all of that correct? What am I missing?
> > Thank you again so much !!
> > EDU.
> >
> >
> >
> > --
> > View this message in context:
> > http://cgal-discuss.949826.n4.nabble.com/How-to-get-some-info-from-a-Delaunay-Triangulation-tp4617393p4620270.html
> >
> > Sent from the cgal-discuss mailing list archive at Nabble.com.


--
Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project

phone: +33.492.954.912    skype: andreas.fabri