CGAL users discussion list

[Andreas Fabri <>]

Hi Rahul,

Remove the * befor fit.

The manual
http://www.cgal.org/Manual/beta/doc_html/cgal_manual/Triangulation_2_ref/Class_Triangulation_2.html#Cross_link_anchor_1235

says:

Triangle          t.triangle ( Face_handle f)    Returns the triangle formed 
by the three vertices of f.
                                                 Precondition:  The face is 
finite.

and all the face iterators and circulators are convertible to Face_handle.

best regards,

andreas


Rahul Kavalapara wrote:
> Hi,
>
> I am trying to output the vertices of triangles in a Triangulation.  I 
> tried to iterate over the faces using the faces iterator, output the 
> triangles vertices to std output.
>
> ************************************************************************************
>
> #include <fstream>
> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
> #include <CGAL/Triangulation_2.h>
> #include <CGAL/Triangle_2.h>
>
> struct K : CGAL::Exact_predicates_inexact_constructions_kernel {};
>
> typedef CGAL::Triangulation_2<K>         Triangulation;
> typedef Triangulation::Vertex_circulator Vertex_circulator;
> typedef Triangulation::Point             Point;
> typedef Triangulation::Finite_faces_iterator Finite_faces_iterator;
>
> int main()
> {
>   std::ifstream in("triangulation_prog1.cin");
>   std::istream_iterator<Point> begin(in);
>   std::istream_iterator<Point> end;
>
>   Triangulation t;
>   t.insert(begin, end);
>
>   Finite_faces_iterator fit;
>   for(fit = t.finite_faces_begin(); fit != t.finite_faces_end(); ++fit)
>   {
>       K::Triangle_2 tri_2 = t.triangle(*fit);  <<-- Error
>       std::cout << tri_2 << "\n";
>   }
>   return 0;
> }
>
>
> Error:
> triangulation_prog1.cpp: In function ‘int main()’:
> triangulation_prog1.cpp:39: error: no matching function for call to 
> ‘CGAL::Triangulation_2<K, CGAL::Tds2<CGAL::Tvb<K, CGAL::Tdsvb<void> >, 
> CGAL::Tfb<K, CGAL::Tdsfb<void> > > >::triangle(CGAL::Tfb<K, 
> CGAL::Tdsfb<CGAL::Tds2<CGAL::Tvb<K, CGAL::Tdsvb<void> >, CGAL::Tfb<K, 
> CGAL::Tdsfb<void> > > > >&)’
> /usr/include/CGAL/Triangulation_2.h:798: note: candidates are: typename 
> CGAL::Triangulation_2<Gt, Tds>::Triangle CGAL::Triangulation_2<Gt, 
> Tds>::triangle(typename Tds::Face_handle) const [with Gt = K, Tds = 
> CGAL::Tds2<CGAL::Tvb<K, CGAL::Tdsvb<void> >, CGAL::Tfb<K, 
> CGAL::Tdsfb<void> > >]
>
>
> Am I missing something for the above code.
>
>
>
> --
> Rahul