122 lines
3.6 KiB
C++
122 lines
3.6 KiB
C++
// Copyright (c) 2016 CNRS and LIRIS' Establishments (France).
|
|
// All rights reserved.
|
|
//
|
|
// This file is part of CGAL (www.cgal.org)
|
|
//
|
|
// $URL: https://github.com/CGAL/cgal/blob/v5.1/Generalized_map/include/CGAL/internal/Generalized_map_sewable.h $
|
|
// $Id: Generalized_map_sewable.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
|
|
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
|
|
//
|
|
// Author(s) : Guillaume Damiand <guillaume.damiand@liris.cnrs.fr>
|
|
//
|
|
#ifndef CGAL_GENERALIZED_MAP_SEWABLE_H
|
|
#define CGAL_GENERALIZED_MAP_SEWABLE_H
|
|
|
|
#include <CGAL/GMap_dart_const_iterators.h>
|
|
#include <CGAL/Unique_hash_map.h>
|
|
|
|
/* Definition of functor used to test if two darts are i-sewable
|
|
* (we use functors as there are different specializations).
|
|
* @todo Specializations ?
|
|
*/
|
|
namespace CGAL
|
|
{
|
|
namespace internal
|
|
{
|
|
// Generic case (and for the moment the only one).
|
|
template<typename GMap, unsigned int i, unsigned int dim=GMap::dimension>
|
|
struct GMap_is_sewable_functor
|
|
{
|
|
static bool run( const GMap& amap,
|
|
typename GMap::Dart_const_handle adart1,
|
|
typename GMap::Dart_const_handle adart2 )
|
|
{
|
|
CGAL_assertion( i<=GMap::dimension );
|
|
if ( !amap.template is_free<i>(adart1) ||
|
|
!amap.template is_free<i>(adart2) )
|
|
return false;
|
|
|
|
if ( adart1==adart2 )
|
|
{
|
|
if ( i==1 ) return true;
|
|
return false;
|
|
}
|
|
|
|
// hash map to build the isomorphism between the two i-cells.
|
|
CGAL::Unique_hash_map<typename GMap::Dart_const_handle,
|
|
typename GMap::Dart_const_handle,
|
|
typename GMap::Hash_function> bijection;
|
|
|
|
typename GMap::size_type m1 = amap.get_new_mark();
|
|
typename GMap::size_type m2 = amap.get_new_mark();
|
|
CGAL::GMap_dart_const_iterator_basic_of_involution<GMap,i>
|
|
I1(amap, adart1, m1);
|
|
CGAL::GMap_dart_const_iterator_basic_of_involution<GMap,i>
|
|
I2(amap, adart2, m2);
|
|
bool res = true;
|
|
typename GMap::size_type mbijection = amap.get_new_mark();
|
|
|
|
while ( res && I1.cont() && I2.cont() )
|
|
{
|
|
amap.mark(I1, mbijection);
|
|
bijection[I1]=I2;
|
|
|
|
CGAL_assertion( amap.template is_free<i>(I1) );
|
|
CGAL_assertion( amap.template is_free<i>(I2) );
|
|
|
|
// We can remove this constraint which is not required for
|
|
// generalized map definition, but which is quite "normal"
|
|
// Indeed in this case we try to i-sew an i-cell with itself (case
|
|
// of folded cells).
|
|
if ( I1==adart2 || I2==adart1 ) res=false;
|
|
|
|
for ( unsigned int j=0; res && j<=GMap::dimension; ++j )
|
|
{
|
|
if ( j+1!=i && j!=i && j!=i+1 )
|
|
{
|
|
if ( amap.is_free(I1,j) )
|
|
{
|
|
if ( !amap.is_free(I2,j) ) res=false;
|
|
}
|
|
else
|
|
{
|
|
if ( amap.is_free(I2,j) ) res=false;
|
|
else if ( amap.is_marked(amap.alpha(I1,j), mbijection) )
|
|
{
|
|
if ( bijection[amap.alpha(I1,j)]!=amap.alpha(I2,j) ) res=false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
++I1; ++I2;
|
|
}
|
|
if ( I1.cont()!=I2.cont() )
|
|
res = false;
|
|
|
|
amap.negate_mark(m1);
|
|
amap.negate_mark(m2);
|
|
I1.rewind(); I2.rewind();
|
|
while ( amap.number_of_marked_darts(mbijection)>0 )
|
|
{
|
|
amap.unmark(I1, mbijection);
|
|
++I1; ++I2;
|
|
}
|
|
|
|
CGAL_assertion( amap.is_whole_map_marked(m1) );
|
|
CGAL_assertion( amap.is_whole_map_marked(m2) );
|
|
CGAL_assertion( amap.is_whole_map_unmarked(mbijection) );
|
|
amap.free_mark(m1);
|
|
amap.free_mark(m2);
|
|
amap.free_mark(mbijection);
|
|
|
|
return res;
|
|
}
|
|
};
|
|
|
|
} //namespace internal
|
|
|
|
} //namespace CGAL
|
|
|
|
#endif // CGAL_COMBINATORIAL_MAP_SEWABLE_H
|
|
//******************************************************************************
|