131 lines
4.0 KiB
C
131 lines
4.0 KiB
C
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// Copyright (c) 2016 CNRS and LIRIS' Establishments (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); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 3 of the License,
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// or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0+
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//
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// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
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//
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#ifndef CGAL_GENERALIZED_MAP_SEWABLE_H
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#define CGAL_GENERALIZED_MAP_SEWABLE_H
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#include <CGAL/GMap_dart_const_iterators.h>
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#include <CGAL/Unique_hash_map.h>
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/* Definition of functor used to test if two darts are i-sewable
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* (we use functors as there are different specializations).
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* @todo Specializations ?
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*/
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namespace CGAL
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{
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namespace internal
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{
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// Generic case (and for the moment the only one).
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template<typename GMap, unsigned int i, unsigned int dim=GMap::dimension>
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struct GMap_is_sewable_functor
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{
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static bool run( const GMap& amap,
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typename GMap::Dart_const_handle adart1,
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typename GMap::Dart_const_handle adart2 )
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{
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CGAL_assertion( i<=GMap::dimension );
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if ( !amap.template is_free<i>(adart1) ||
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!amap.template is_free<i>(adart2) )
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return false;
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if ( adart1==adart2 )
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{
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if ( i==1 ) return true;
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return false;
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}
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// hash map to build the isomorphism between the two i-cells.
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CGAL::Unique_hash_map<typename GMap::Dart_const_handle,
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typename GMap::Dart_const_handle,
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typename GMap::Hash_function> bijection;
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typename GMap::size_type m1 = amap.get_new_mark();
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typename GMap::size_type m2 = amap.get_new_mark();
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CGAL::GMap_dart_const_iterator_basic_of_involution<GMap,i>
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I1(amap, adart1, m1);
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CGAL::GMap_dart_const_iterator_basic_of_involution<GMap,i>
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I2(amap, adart2, m2);
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bool res = true;
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typename GMap::size_type mbijection = amap.get_new_mark();
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while ( res && I1.cont() && I2.cont() )
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{
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amap.mark(I1, mbijection);
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bijection[I1]=I2;
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CGAL_assertion( amap.template is_free<i>(I1) );
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CGAL_assertion( amap.template is_free<i>(I2) );
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// We can remove this constraint which is not required for
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// generalized map definition, but which is quite "normal"
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// Indeed in this case we try to i-sew an i-cell with itself (case
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// of folded cells).
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if ( I1==adart2 || I2==adart1 ) res=false;
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for ( unsigned int j=0; res && j<=GMap::dimension; ++j )
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{
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if ( j+1!=i && j!=i && j!=i+1 )
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{
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if ( amap.is_free(I1,j) )
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{
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if ( !amap.is_free(I2,j) ) res=false;
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}
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else
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{
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if ( amap.is_free(I2,j) ) res=false;
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else if ( amap.is_marked(amap.alpha(I1,j), mbijection) )
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{
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if ( bijection[amap.alpha(I1,j)]!=amap.alpha(I2,j) ) res=false;
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}
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}
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}
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}
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++I1; ++I2;
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}
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if ( I1.cont()!=I2.cont() )
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res = false;
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amap.negate_mark(m1);
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amap.negate_mark(m2);
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I1.rewind(); I2.rewind();
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while ( amap.number_of_marked_darts(mbijection)>0 )
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{
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amap.unmark(I1, mbijection);
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++I1; ++I2;
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}
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CGAL_assertion( amap.is_whole_map_marked(m1) );
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CGAL_assertion( amap.is_whole_map_marked(m2) );
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CGAL_assertion( amap.is_whole_map_unmarked(mbijection) );
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amap.free_mark(m1);
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amap.free_mark(m2);
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amap.free_mark(mbijection);
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return res;
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}
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};
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} //namespace internal
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} //namespace CGAL
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#endif // CGAL_COMBINATORIAL_MAP_SEWABLE_H
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//******************************************************************************
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