CGAL users discussion list

[Matthew Denno <>]

I am sort of new to this myself so take this for what it is worth, but...

Inside your loop do try something like this:

std::cout << fit->vertex(0)->point(); // the first vertex
std::cout << fit->vertex(1)->point(); //the second
std::cout << fit->vertex(2)->point(); //the third

or if you want a triangle try something like:

Point t1p1 = fit1->vertex(0)->point();
Point t1p2 = fit1->vertex(1)->point();
Point t1p3 = fit1->vertex(2)->point();

Triangle t1 = Triangle(t1p1,t1p2,t1p3);

If you want to do this second option you will have to typedef Point and Triangle.

On Thu, Sep 10, 2009 at 2:26 PM, 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