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// Copyright (c) 2010-2011 CNRS and LIRIS' Establishments (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
//
#ifndef CGAL_COMBINATORIAL_MAP_CONSTRUCTORS_H
#define CGAL_COMBINATORIAL_MAP_CONSTRUCTORS_H 1
namespace CGAL {
/** @file Combinatorial_map_constructors.h
* Basic creation operations for a combinatorial map.
* Create edge, triangle, quadrilateral, tetrahedron, hexahedron.
*/
/** Create an edge.
* @param amap the used combinatorial map.
* @return a dart of the new edge.
*/
template < class Map >
typename Map::Dart_handle make_edge(Map& amap)
{
typename Map::Dart_handle d1 = amap.create_dart();
typename Map::Dart_handle d2 = amap.create_dart();
amap.template basic_link_beta<2>(d1, d2);
return d1;
}
/** Create a combinatorial polygon of length alg
* (a cycle of alg darts beta1 links together).
* @param amap the used combinatorial map.
* @return a new dart.
*/
template < class Map >
typename Map::Dart_handle make_combinatorial_polygon(Map& amap,
unsigned int alg)
{
CGAL_assertion(alg>0);
typename Map::Dart_handle start = amap.create_dart();
typename Map::Dart_handle prev = start;
for ( unsigned int nb=1; nb<alg; ++nb )
{
typename Map::Dart_handle cur = amap.create_dart();
amap.template basic_link_beta<1>(prev, cur);
prev=cur;
}
amap.template basic_link_beta<1>(prev, start);
return start;
}
/** Create a combinatorial tetrahedron from 4 triangles.
* @param amap the used combinatorial map.
* @param d1 a dart onto a first triangle.
* @param d2 a dart onto a second triangle.
* @param d3 a dart onto a third triangle.
* @param d4 a dart onto a fourth triangle.
* @return a new dart.
*/
template < class Map >
typename Map::Dart_handle
make_combinatorial_tetrahedron(Map& amap,
typename Map::Dart_handle d1,
typename Map::Dart_handle d2,
typename Map::Dart_handle d3,
typename Map::Dart_handle d4)
{
amap.basic_link_beta(d1, d2, 2);
amap.basic_link_beta(d3, d2->beta(0), 2);
amap.basic_link_beta(d1->beta(1), d3->beta(0), 2);
amap.basic_link_beta(d4, d2->beta(1), 2);
amap.basic_link_beta(d4->beta(0), d3->beta(1), 2);
amap.basic_link_beta(d4->beta(1), d1->beta(0), 2);
return d1;
}
/** Create a new combinatorial tetrahedron.
* @param amap the used combinatorial map.
* @return a new dart.
*/
template < class Map >
typename Map::Dart_handle make_combinatorial_tetrahedron(Map& amap)
{
typename Map::Dart_handle d1 = make_combinatorial_polygon(amap,3);
typename Map::Dart_handle d2 = make_combinatorial_polygon(amap,3);
typename Map::Dart_handle d3 = make_combinatorial_polygon(amap,3);
typename Map::Dart_handle d4 = make_combinatorial_polygon(amap,3);
return make_combinatorial_tetrahedron(amap, d1, d2, d3, d4);
}
/** Create a combinatorial hexahedron from 6 quadrilaterals.
* @param amap the used combinatorial map.
* @param d1 a dart onto a first quadrilateral.
* @param d2 a dart onto a second quadrilateral.
* @param d3 a dart onto a third quadrilateral.
* @param d4 a dart onto a fourth quadrilateral.
* @param d5 a dart onto a fifth quadrilateral.
* @param d6 a dart onto a sixth quadrilateral.
* @return a dart of the new cuboidal_cell.
*/
template < class Map >
typename Map::Dart_handle
make_combinatorial_hexahedron(Map& amap,
typename Map::Dart_handle d1,
typename Map::Dart_handle d2,
typename Map::Dart_handle d3,
typename Map::Dart_handle d4,
typename Map::Dart_handle d5,
typename Map::Dart_handle d6)
{
amap.basic_link_beta(d1, d4->beta(1)->beta(1), 2);
amap.basic_link_beta(d1->beta(1), d6->beta(0) , 2);
amap.basic_link_beta(d1->beta(1)->beta(1), d2 , 2);
amap.basic_link_beta(d1->beta(0), d5 , 2);
amap.basic_link_beta(d3, d2->beta(1)->beta(1), 2);
amap.basic_link_beta(d3->beta(1), d6->beta(1) , 2);
amap.basic_link_beta(d3->beta(1)->beta(1), d4 , 2);
amap.basic_link_beta(d3->beta(0), d5->beta(1)->beta(1), 2);
amap.basic_link_beta(d6, d4->beta(1) , 2);
amap.basic_link_beta(d6->beta(1)->beta(1), d2->beta(1) , 2);
amap.basic_link_beta(d5->beta(0), d4->beta(0) , 2);
amap.basic_link_beta(d5->beta(1), d2->beta(0) , 2);
return d1;
}
/** Create a new combinatorial hexahedron.
* @param amap the used combinatorial map.
* @return a new dart.
*/
template < class Map >
typename Map::Dart_handle make_combinatorial_hexahedron(Map& amap)
{
typename Map::Dart_handle d1 = make_combinatorial_polygon(amap,4);
typename Map::Dart_handle d2 = make_combinatorial_polygon(amap,4);
typename Map::Dart_handle d3 = make_combinatorial_polygon(amap,4);
typename Map::Dart_handle d4 = make_combinatorial_polygon(amap,4);
typename Map::Dart_handle d5 = make_combinatorial_polygon(amap,4);
typename Map::Dart_handle d6 = make_combinatorial_polygon(amap,4);
return make_combinatorial_hexahedron(amap, d1, d2, d3, d4, d5, d6);
}
} // namespace CGAL
#endif // CGAL_COMBINATORIAL_MAP_CONSTRUCTORS_H //
// EOF //
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