mirror of https://github.com/CGAL/cgal
74 lines
1.9 KiB
C++
74 lines
1.9 KiB
C++
// Copyright (c) 2014 INRIA Sophia-Antipolis (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Clement Jamin
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#ifndef CGAL_TRIANGULATION_OFF_OSTREAM_2_H
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#define CGAL_TRIANGULATION_OFF_OSTREAM_2_H
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#include <CGAL/license/Triangulation_2.h>
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#include <CGAL/Triangulation_2.h>
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#include <sstream>
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#include <iostream>
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namespace CGAL {
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template < class GT, class TDS >
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std::ostream &
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export_triangulation_2_to_off(std::ostream & os,
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const Triangulation_2<GT,TDS> & tr)
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{
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typedef Triangulation_2<GT,TDS> Tr;
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typedef typename Tr::Vertex_handle Vertex_handle;
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typedef typename Tr::Vertex_iterator Vertex_iterator;
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typedef typename Tr::Finite_vertices_iterator Finite_vertex_iterator;
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typedef typename Tr::Finite_faces_iterator Finite_faces_iterator;
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size_t n = tr.number_of_vertices();
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std::stringstream output;
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// write the vertices
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std::map<Vertex_handle, int> index_of_vertex;
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int i = 0;
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for(Finite_vertex_iterator it = tr.finite_vertices_begin();
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it != tr.finite_vertices_end(); ++it, ++i)
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{
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output << it->point().x() << " " << it->point().y() << " 0" << std::endl;
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index_of_vertex[it.base()] = i;
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}
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CGAL_assertion( i == n );
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size_t number_of_triangles = 0;
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for (Finite_faces_iterator fit = tr.finite_faces_begin() ;
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fit != tr.finite_faces_end() ; ++fit)
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{
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output << "3 "
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<< index_of_vertex[fit->vertex(0)] << " "
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<< index_of_vertex[fit->vertex(1)] << " "
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<< index_of_vertex[fit->vertex(2)]
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<< std::endl;
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++number_of_triangles;
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}
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os << "OFF \n"
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<< n << " "
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<< number_of_triangles << " 0\n"
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<< output.str();
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return os;
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}
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} //namespace CGAL
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#endif // CGAL_TRIANGULATION_OFF_OSTREAM_2_H
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