143 lines
5.2 KiB
C++
Executable File
143 lines
5.2 KiB
C++
Executable File
// Copyright (c) 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.
|
|
//
|
|
// $URL$
|
|
// $Id$
|
|
// SPDX-License-Identifier: LGPL-3.0+
|
|
//
|
|
// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
|
|
//
|
|
|
|
#ifndef CGAL_TRIANGULATION_3_TO_LCC_H
|
|
#define CGAL_TRIANGULATION_3_TO_LCC_H
|
|
|
|
#include <CGAL/assertions.h>
|
|
#include <map>
|
|
|
|
namespace CGAL {
|
|
|
|
/** Convert a given Triangulation_3 into a 3D linear cell complex.
|
|
* @param alcc the used linear cell complex.
|
|
* @param atr the Triangulation_3.
|
|
* @param avol_to_dart a pointer to a std::map associating to each
|
|
* tetrahedron of atr a corresponding dart in alcc. Not used if NULL.
|
|
* @return A dart incident to the infinite vertex.
|
|
*/
|
|
template < class LCC, class Triangulation >
|
|
typename LCC::Dart_handle import_from_triangulation_3
|
|
(LCC& alcc, const Triangulation &atr,
|
|
std::map<typename Triangulation::Cell_handle,
|
|
typename LCC::Dart_handle >* avol_to_dart=NULL)
|
|
{
|
|
CGAL_static_assertion( LCC::dimension>=3 && LCC::ambient_dimension==3 );
|
|
|
|
// Case of empty triangulations.
|
|
if (atr.number_of_vertices() == 0) return LCC::null_handle;
|
|
|
|
// Check the dimension.
|
|
if (atr.dimension() != 3) return LCC::null_handle;
|
|
CGAL_assertion(atr.is_valid());
|
|
|
|
typedef typename Triangulation::Vertex_handle TVertex_handle;
|
|
typedef typename Triangulation::Vertex_iterator TVertex_iterator;
|
|
typedef typename Triangulation::Cell_iterator TCell_iterator;
|
|
typedef typename std::map
|
|
< TCell_iterator, typename LCC::Dart_handle >::iterator itmap_tcell;
|
|
|
|
// Create vertices in the map and associate in a map
|
|
// TVertex_handle and vertices in the map.
|
|
std::map< TVertex_handle, typename LCC::Vertex_attribute_handle > TV;
|
|
for (TVertex_iterator itv = atr.vertices_begin();
|
|
itv != atr.vertices_end(); ++itv)
|
|
{
|
|
TV[itv] = alcc.create_vertex_attribute(itv->point());
|
|
}
|
|
|
|
// Create the tetrahedron and create a map to link Cell_iterator
|
|
// and tetrahedron.
|
|
TCell_iterator it;
|
|
|
|
std::map<typename Triangulation::Cell_handle, typename LCC::Dart_handle> TC;
|
|
std::map<typename Triangulation::Cell_handle, typename LCC::Dart_handle>*
|
|
mytc = (avol_to_dart==NULL?&TC:avol_to_dart);
|
|
|
|
itmap_tcell maptcell_it;
|
|
|
|
typename LCC::Dart_handle res=LCC::null_handle, dart=LCC::null_handle;
|
|
typename LCC::Dart_handle cur=LCC::null_handle, neighbor=LCC::null_handle;
|
|
|
|
for (it = atr.cells_begin(); it != atr.cells_end(); ++it)
|
|
{
|
|
/* if (it->vertex(0) != atr.infinite_vertex() &&
|
|
it->vertex(1) != atr.infinite_vertex() &&
|
|
it->vertex(2) != atr.infinite_vertex() &&
|
|
it->vertex(3) != atr.infinite_vertex())
|
|
*/
|
|
{
|
|
res = alcc.make_tetrahedron(TV[it->vertex(0)],
|
|
TV[it->vertex(1)],
|
|
TV[it->vertex(2)],
|
|
TV[it->vertex(3)]);
|
|
|
|
if ( dart==LCC::null_handle )
|
|
{
|
|
if ( it->vertex(0) == atr.infinite_vertex() )
|
|
dart = res;
|
|
else if ( it->vertex(1) == atr.infinite_vertex() )
|
|
dart = alcc.next(res);
|
|
else if ( it->vertex(2) == atr.infinite_vertex() )
|
|
dart = alcc.previous(res);
|
|
else if ( it->vertex(3) == atr.infinite_vertex() )
|
|
dart = alcc.previous(alcc.template opposite<2>(res));
|
|
}
|
|
|
|
for (unsigned int i = 0; i < 4; ++i)
|
|
{
|
|
switch (i)
|
|
{
|
|
case 0: cur = alcc.template opposite<2>(alcc.next(res)); break;
|
|
case 1: cur = alcc.template opposite<2>(alcc.previous(res)); break;
|
|
case 2: cur = alcc.template opposite<2>(res); break;
|
|
case 3: cur = res; break;
|
|
}
|
|
|
|
maptcell_it = mytc->find(it->neighbor(i));
|
|
if (maptcell_it != mytc->end())
|
|
{
|
|
switch (atr.mirror_index(it,i) )
|
|
{
|
|
case 0: neighbor = alcc.template opposite<2>(alcc.next(maptcell_it->second));
|
|
break;
|
|
case 1: neighbor = alcc.template opposite<2>(alcc.previous(maptcell_it->second));
|
|
break;
|
|
case 2: neighbor = alcc.template opposite<2>(maptcell_it->second); break;
|
|
case 3: neighbor = maptcell_it->second; break;
|
|
}
|
|
while (alcc.vertex_attribute(neighbor) !=
|
|
alcc.vertex_attribute(alcc.other_extremity(cur)) )
|
|
neighbor = alcc.next(neighbor);
|
|
alcc.template topo_sew<3>(cur, alcc.other_orientation(neighbor));
|
|
}
|
|
}
|
|
(*mytc)[it] = res;
|
|
}
|
|
}
|
|
CGAL_assertion(dart!=LCC::null_handle);
|
|
return dart;
|
|
}
|
|
|
|
} // namespace CGAL
|
|
|
|
#endif // CGAL_TRIANGULATION_3_TO_LCC_H
|