814 lines
29 KiB
C++
814 lines
29 KiB
C++
// Copyright (c) 2010-2011 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Combinatorial_map/include/CGAL/Combinatorial_map_operations.h $
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// $Id: Combinatorial_map_operations.h 52164b1 2019-10-19T15:34:59+02:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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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_COMBINATORIAL_MAP_OPERATIONS_H
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#define CGAL_COMBINATORIAL_MAP_OPERATIONS_H 1
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#include <CGAL/Dart_const_iterators.h>
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#include <CGAL/internal/Combinatorial_map_group_functors.h>
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#include <deque>
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#define CGAL_BETAINV(i) (i>1?i:(i==1?0:1))
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namespace CGAL
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{
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/** @file Combinatorial_map_operations.h
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* Some operations to modify a combinatorial map.
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*/
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/** Test if an i-cell can be removed.
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* An i-cell can be removed if i==CMap::dimension or i==CMap::dimension-1,
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* or if there are at most two (i+1)-cell incident to it.
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* @param adart a dart of the i-cell.
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* @return true iff the i-cell can be removed.
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*/
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template <class CMap, unsigned int i, unsigned int nmi=CMap::dimension-i>
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struct Is_removable_functor
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{
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static bool run(const CMap& amap, typename CMap::Dart_const_handle adart)
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{
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// TODO? Optimisation for dim-2, and to not test all the darts of the cell?
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bool res = true;
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for ( CGAL::CMap_dart_const_iterator_of_cell<CMap,i> it(amap, adart);
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res && it.cont(); ++it )
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{
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if ( amap.template beta<i+2,i+1>(it)!=
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amap.template beta<CGAL_BETAINV(i+1),i+2>(it) )
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res = false;
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}
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return res;
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}
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};
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// Specialization for i=CMap::dimension
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template <class CMap, unsigned int i>
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struct Is_removable_functor<CMap, i, 0>
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{
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static bool run(const CMap&, typename CMap::Dart_const_handle)
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{ return true; }
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};
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// Specialization for i=CMap::dimension-1
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template <class CMap, unsigned int i>
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struct Is_removable_functor<CMap, i, 1>
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{
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static bool run(const CMap&, typename CMap::Dart_const_handle)
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{ return true; }
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};
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/** Test if an i-cell can be removed.
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* An i-cell can be removed if i==CMap::dimension or i==CMap::dimension-1,
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* or if there are at most two (i+1)-cell incident to it.
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* @param adart a dart of the i-cell.
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* @return true iff the i-cell can be removed.
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*/
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#ifndef CGAL_NO_DEPRECATED_CODE
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template < class CMap, unsigned int i >
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CGAL_DEPRECATED bool is_removable(const CMap& amap,
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typename CMap::Dart_const_handle adart)
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{ return CGAL::Is_removable_functor<CMap, i>::run(amap,adart); }
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#endif // CGAL_NO_DEPRECATED_CODE
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/** Remove an i-cell, 0<i<dimension, and merge eventually both incident
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* (i+1)-cells.
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* @param amap the used combinatorial map.
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* @param adart a dart of the i-cell to remove.
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* @param update_attributes a boolean to update the enabled attributes
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* (deprecated, now we use are_attributes_automatically_managed())
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* @return the number of deleted darts.
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*/
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template<class CMap, unsigned int i, unsigned int nmi>
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struct Remove_cell_functor
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{
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static size_t run(CMap& amap, typename CMap::Dart_handle adart,
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bool update_attributes)
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{
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CGAL_static_assertion ( 1<=i && i<CMap::dimension );
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CGAL_assertion( (amap.template is_removable<i>(adart)) );
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size_t res = 0;
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typename CMap::Dart_handle d1, d2;
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typename CMap::Dart_handle dg1=amap.null_handle, dg2=amap.null_handle;
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typename CMap::size_type mark = amap.get_new_mark();
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typename CMap::size_type mark_modified_darts = amap.get_new_mark();
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std::deque<typename CMap::Dart_handle> to_erase;
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const int iinv = CGAL_BETAINV(i);
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// First we store and mark all the darts of the i-cell to remove.
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for ( CGAL::CMap_dart_iterator_basic_of_cell<CMap,i> it(amap,adart,mark);
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it.cont(); ++it )
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{
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to_erase.push_back(it);
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if ( !amap.template is_free<i+1>(it) && dg1==amap.null_handle )
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{ dg1=it; dg2=amap.template beta<i+1>(it); }
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amap.mark(it, mark);
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++res;
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}
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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// We group the two (i+1)-cells incident if they exist.
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if ( dg1!=amap.null_handle )
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CGAL::internal::Group_attribute_functor_run<CMap, i+1>::
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run(amap, dg1, dg2);
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}
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// During the operation, we store in modified_darts the darts modified
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// to test after the loop the non void attributes that are split.
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std::deque<typename CMap::Dart_handle> modified_darts;
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// If i==1, we modify beta1, thus in modified_darts we store all
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// the darts having beta0 modified, and in modified_darts2 all the
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// darts having beta1 modified. For i>1 all the modified darts are
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// stored in modified_darts.
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std::deque<typename CMap::Dart_handle> modified_darts2;
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std::deque<typename CMap::Dart_handle> &first_modified_darts=
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(i==1?modified_darts2:modified_darts);
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// For each dart of the i-cell, we modify i-links of neighbors.
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typename std::deque<typename CMap::Dart_handle>::iterator it =
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to_erase.begin();
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for ( ; it!=to_erase.end(); ++it )
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{
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if (i!=1 || amap.template beta<1>(*it)!=*it) // for 1-removal of a dart loop, nothing to do
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{
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d1=amap.template beta<iinv>(*it);
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while (d1!=amap.null_dart_handle && amap.is_marked(d1, mark))
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{
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d1=amap.template beta<i+1, iinv>(d1);
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if (d1==amap. template beta<iinv>(*it))
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{ d1=amap.null_dart_handle; }
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}
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d2=amap.template beta<i+1,i>(*it);
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while ( d2!=amap.null_dart_handle && amap.is_marked(d2, mark) )
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{
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d2=amap.template beta<i+1,i>(d2);
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if ( d2==amap.template beta<i+1,i>(*it) )
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{ d2=amap.null_dart_handle; }
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}
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if ( d1!=amap.null_dart_handle )
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{
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if ( d2!=amap.null_dart_handle && d1!=d2 )
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{
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amap.template basic_link_beta<i>(d1, d2);
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amap.mark(d1, mark_modified_darts);
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amap.mark(d2, mark_modified_darts);
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first_modified_darts.push_back(d1);
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modified_darts.push_back(d2);
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}
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else
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{
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if (d1==d2)
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{
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amap.template basic_link_beta<i>(d1, d1);
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amap.mark(d1, mark_modified_darts);
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first_modified_darts.push_back(d1);
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}
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else if ( !amap.template is_free<i>(d1) )
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{
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amap.template unlink_beta<i>(d1);
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amap.mark(d1, mark_modified_darts);
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first_modified_darts.push_back(d1);
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}
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}
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}
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else if ( d2!=amap.null_dart_handle )
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{
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if ( !amap.template is_free<iinv>(d2) )
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{
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amap.template unlink_beta<iinv>(d2);
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amap.mark(d2, mark_modified_darts);
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modified_darts.push_back(d2);
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}
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}
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}
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if ( amap.template is_free<i+1>(*it) &&
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!amap.template is_free<i>(*it) )
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{
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d1 = amap.template beta<i>(*it);
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if ( !amap.template is_free<iinv>(d1) )
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{
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amap.template unlink_beta<iinv>(d1);
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amap.mark(d1, mark_modified_darts);
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modified_darts.push_back(d1);
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}
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}
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}
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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// We test the split of all the incident cells for all the non
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// void attributes.
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if ( i==1 )
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CMap::Helper::template Foreach_enabled_attributes_except
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<CGAL::internal::Test_split_attribute_functor<CMap,i>, i>::
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run(amap, modified_darts, modified_darts2,
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mark_modified_darts);
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else
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CMap::Helper::template Foreach_enabled_attributes_except
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<CGAL::internal::Test_split_attribute_functor<CMap,i>, i>::
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run(amap, modified_darts, mark_modified_darts);
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}
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// We remove all the darts of the i-cell.
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for ( it=to_erase.begin(); it!=to_erase.end(); ++it )
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{ amap.erase_dart(*it); }
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CGAL_assertion( amap.is_whole_map_unmarked(mark) );
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amap.free_mark(mark);
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// If no attribute is enabled (or if only i-attributes are enabled),
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// the darts are not unmark by Foreach_enabled_attributes_except.
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// Thus we unmark them now.
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if ( !amap.is_whole_map_unmarked(mark_modified_darts) )
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{
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for ( typename std::deque<typename CMap::Dart_handle>::
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iterator it=modified_darts.begin();
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it!=modified_darts.end(); ++it )
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amap.unmark(*it, mark_modified_darts);
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if ( i==1 )
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{
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for ( typename std::deque<typename CMap::Dart_handle>::
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iterator it=modified_darts2.begin();
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it!=modified_darts2.end(); ++it )
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amap.unmark(*it, mark_modified_darts);
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}
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}
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CGAL_assertion ( amap.is_whole_map_unmarked(mark_modified_darts) );
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amap.free_mark(mark_modified_darts);
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#ifdef CGAL_CMAP_TEST_VALID_REMOVALS
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CGAL_assertion( amap.is_valid() );
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#endif
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return res;
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}
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};
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/** Remove a d-cell, in a d-map (special case).
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* @param amap the used combinatorial map.
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* @param adart a dart of the d-cell to remove.
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* @param update_attributes a boolean to update the enabled attributes
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* (deprecated, now we use are_attributes_automatically_managed())
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* @return the number of deleted darts.
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*/
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template<class CMap,unsigned int i>
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struct Remove_cell_functor<CMap,i,0>
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{
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static size_t run(CMap& amap, typename CMap::Dart_handle adart,
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bool update_attributes)
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{
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typename CMap::size_type mark = amap.get_new_mark();
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std::deque<typename CMap::Dart_handle> to_erase;
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size_t res = 0;
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std::deque<typename CMap::Dart_handle> modified_darts;
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// We mark all the darts of the d-cell.
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for ( CGAL::CMap_dart_iterator_basic_of_cell<CMap,CMap::dimension>
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it(amap,adart,mark); it.cont(); ++it )
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{
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to_erase.push_back(it);
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amap.mark(it,mark);
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++res;
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}
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// We unlink all the darts of the d-cell for beta-d.
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typename std::deque<typename CMap::Dart_handle>::iterator
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it = to_erase.begin();
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for ( it = to_erase.begin(); it != to_erase.end(); ++it )
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{
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if ( !amap.template is_free<CMap::dimension>(*it) &&
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!amap.is_marked(amap.template beta<CMap::dimension>(*it), mark) )
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{
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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modified_darts.push_back(amap.template beta<CMap::dimension>(*it));
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}
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amap.template unlink_beta_for_involution<CMap::dimension>(*it);
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}
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}
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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// We test the split of all the incident cells for all the non
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// void attributes.
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CMap::Helper::template Foreach_enabled_attributes_except
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<CGAL::internal::Test_split_attribute_functor<CMap,i>,
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CMap::dimension>::run(amap, modified_darts);
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}
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// We remove all the darts of the d-cell.
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for ( it = to_erase.begin(); it != to_erase.end(); ++it )
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{ amap.erase_dart(*it); }
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CGAL_assertion( amap.is_whole_map_unmarked(mark) );
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amap.free_mark(mark);
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#ifdef CGAL_CMAP_TEST_VALID_REMOVALS
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CGAL_assertion( amap.is_valid() );
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#endif
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return res;
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}
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};
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/** Remove a vertex, and merge eventually both incident edges.
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* @param amap the used combinatorial map.
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* @param adart a dart of the vertex to remove.
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* @param update_attributes a boolean to update the enabled attributes
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* (deprecated, now we use are_attributes_automatically_managed())
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* @return the number of deleted darts.
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*/
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template<class CMap,unsigned int nmi>
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struct Remove_cell_functor<CMap,0,nmi>
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{
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static size_t run(CMap& amap, typename CMap::Dart_handle adart,
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bool update_attributes)
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{
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CGAL_assertion( (amap.template is_removable<0>(adart)) );
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size_t res = 0;
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typename CMap::Dart_handle d1, d2;
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typename CMap::Dart_handle dg1=amap.null_handle, dg2=amap.null_handle;
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typename CMap::size_type mark = amap.get_new_mark();
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// First we store and mark all the darts of the 0-cell to remove.
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std::deque<typename CMap::Dart_handle> to_erase;
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for ( CGAL::CMap_dart_iterator_basic_of_cell<CMap,0> it(amap,adart,mark);
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it.cont(); ++it )
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{
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to_erase.push_back(it);
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if ( !amap.template is_free<0>(it) && dg1==amap.null_handle )
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{ dg1=it; dg2=amap.template beta<0>(it); }
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amap.mark(it, mark);
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++res;
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}
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if (amap.are_attributes_automatically_managed() && update_attributes )
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{
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// We group the two edges incident if they exist.
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if ( dg1!=amap.null_handle )
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CGAL::internal::Group_attribute_functor_run<CMap, 1>::
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run(amap, dg1, dg2);
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}
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// During the operation, we store in modified_darts the darts modified
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// by beta0 to test after the loop non void attributes that are split.
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std::deque<typename CMap::Dart_handle> modified_darts;
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// And we store in modified_darts2 all the darts having beta1 modified.
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std::deque<typename CMap::Dart_handle> modified_darts2;
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// For each dart of the vertex, we modify 0 and 1-links of neighbors.
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typename std::deque<typename CMap::Dart_handle>::iterator it =
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to_erase.begin();
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for ( ; it != to_erase.end(); ++it)
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{
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if ( !amap.template is_free<0>(*it) )
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{
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if ( !amap.template is_free<1>(*it) &&
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amap.template beta<0>(*it)!=(*it) )
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{
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amap.basic_link_beta_1(amap.template beta<0>(*it),
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amap.template beta<1>(*it));
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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modified_darts.push_back(amap.template beta<0>(*it));
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modified_darts2.push_back(amap.template beta<1>(*it));
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// TODO push only one out of two dart ?
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}
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}
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else
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{
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amap.template dart_unlink_beta<1>(amap.template beta<0>(*it));
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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modified_darts.push_back(amap.template beta<0>(*it));
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}
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}
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for ( unsigned int j=2; j<=CMap::dimension; ++j )
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{
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if ( !amap.is_free(*it,j) )
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{
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amap.basic_link_beta(amap.template beta<0>(*it),
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amap.beta(*it,j), j);
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//((*it)->beta(0))->basic_link_beta((*it)->beta(j),j);
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}
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}
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}
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else
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{
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if ( !amap.template is_free<1>(*it) )
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{
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amap.template dart_unlink_beta<0>(amap.template beta<1>(*it));
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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modified_darts2.push_back(amap.template beta<1>(*it));
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}
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}
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for ( unsigned int j=2; j<=CMap::dimension; ++j )
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{
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if ( !amap.is_free(*it,j) )
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{ amap.unlink_beta(*it, j); }
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}
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}
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}
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if (amap.are_attributes_automatically_managed() && update_attributes)
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{
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// We test the split of all the incident cells for all the non
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// void attributes.
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CMap::Helper::template Foreach_enabled_attributes_except
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<CGAL::internal::Test_split_attribute_functor<CMap,0>, 1>::
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run(amap, modified_darts, modified_darts2);
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}
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// We remove all the darts of the 0-cell.
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for ( it=to_erase.begin(); it!=to_erase.end(); ++it )
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{ amap.erase_dart(*it); }
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CGAL_assertion( amap.is_whole_map_unmarked(mark) );
|
|
amap.free_mark(mark);
|
|
|
|
#ifdef CGAL_CMAP_TEST_VALID_REMOVALS
|
|
CGAL_assertion( amap.is_valid() );
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
};
|
|
|
|
/** Remove an i-cell, 0<=i<=dimension.
|
|
* @param amap the used combinatorial map.
|
|
* @param adart a dart of the i-cell to remove.
|
|
* @param update_attributes a boolean to update the enabled attributes
|
|
* @return the number of deleted darts.
|
|
*/
|
|
#ifndef CGAL_NO_DEPRECATED_CODE
|
|
template < class CMap, unsigned int i >
|
|
CGAL_DEPRECATED size_t remove_cell(CMap& amap, typename CMap::Dart_handle adart,
|
|
bool update_attributes = true)
|
|
{
|
|
return CGAL::Remove_cell_functor<CMap,i,CMap::dimension-i>::
|
|
run(amap,adart,update_attributes);
|
|
}
|
|
#endif // CGAL_NO_DEPRECATED_CODE
|
|
|
|
/** Test if an i-cell can be contracted.
|
|
* An i-cell can be contracted if i==1
|
|
* or if there are at most two (i-1)-cell incident to it.
|
|
* @param adart a dart of the i-cell.
|
|
* @return true iff the i-cell can be contracted.
|
|
*/
|
|
template <class CMap, unsigned int i>
|
|
struct Is_contractible_functor
|
|
{
|
|
static bool run(const CMap& amap, typename CMap::Dart_const_handle adart)
|
|
{
|
|
// TODO ? Optimisation possible to not test all the darts of the cell ?
|
|
bool res = true;
|
|
for ( CGAL::CMap_dart_const_iterator_of_cell<CMap,i> it(amap, adart);
|
|
res && it.cont(); ++it )
|
|
{
|
|
if ( amap.template beta<i-2,i-1>(it)!=
|
|
amap.template beta<i-1,CGAL_BETAINV(i-2)>(it) )
|
|
res = false;
|
|
}
|
|
return res;
|
|
}
|
|
};
|
|
// Specialization for i=0
|
|
template <class CMap>
|
|
struct Is_contractible_functor<CMap, 0>
|
|
{
|
|
static bool run(const CMap&, typename CMap::Dart_const_handle)
|
|
{ return false; }
|
|
};
|
|
// Specialization for i=1
|
|
template <class CMap>
|
|
struct Is_contractible_functor<CMap, 1>
|
|
{
|
|
static bool run(const CMap&, typename CMap::Dart_const_handle)
|
|
{ return true; }
|
|
};
|
|
/** Test if an i-cell can be contracted.
|
|
* An i-cell can be contracted if i==1
|
|
* or if there are at most two (i-1)-cell incident to it.
|
|
* @param adart a dart of the i-cell.
|
|
* @return true iff the i-cell can be contracted.
|
|
*/
|
|
#ifndef CGAL_NO_DEPRECATED_CODE
|
|
template < class CMap, unsigned int i >
|
|
CGAL_DEPRECATED bool is_contractible(const CMap& amap, typename CMap::Dart_const_handle adart)
|
|
{ return CGAL::Is_contractible_functor<CMap, i>::run(amap,adart); }
|
|
#endif // CGAL_NO_DEPRECATED_CODE
|
|
|
|
/** Contract an i-cell, 1<i<=dimension, and merge eventually both incident
|
|
* (i-1)-cells.
|
|
* @param amap the used combinatorial map.
|
|
* @param adart a dart of the i-cell to contract.
|
|
* @return the number of deleted darts.
|
|
*/
|
|
template<class CMap, unsigned int i>
|
|
struct Contract_cell_functor
|
|
{
|
|
static size_t run(CMap& amap, typename CMap::Dart_handle adart,
|
|
bool update_attributes)
|
|
{
|
|
CGAL_static_assertion ( 2<=i && i<=CMap::dimension );
|
|
CGAL_assertion( (amap.template is_contractible<i>(adart)) );
|
|
|
|
size_t res = 0;
|
|
|
|
typename CMap::Dart_handle d1, d2;
|
|
typename CMap::Dart_handle dg1=amap.null_handle, dg2=amap.null_handle;
|
|
|
|
typename CMap::size_type mark = amap.get_new_mark();
|
|
typename CMap::size_type mark_modified_darts = amap.get_new_mark();
|
|
|
|
const int imuinv = CGAL_BETAINV(i-1);
|
|
|
|
// First we store and mark all the darts of the i-cell to contract.
|
|
std::deque<typename CMap::Dart_handle> to_erase;
|
|
for ( CGAL::CMap_dart_iterator_basic_of_cell<CMap,i> it(amap,adart,mark);
|
|
it.cont(); ++it )
|
|
{
|
|
to_erase.push_back(it);
|
|
if ( !amap.template is_free<i-1>(it) && dg1==amap.null_handle )
|
|
{ dg1=it; dg2=amap.template beta<i-1>(it); }
|
|
amap.mark(it, mark);
|
|
++res;
|
|
}
|
|
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
// We group the two (i-1)-cells incident if they exist.
|
|
if ( dg1!=amap.null_handle )
|
|
CGAL::internal::Group_attribute_functor_run<CMap,i-1>::
|
|
run(amap, dg1, dg2);
|
|
}
|
|
|
|
// During the operation, we store in modified_darts the darts modified
|
|
// to test after the loop the non void attributes that are split.
|
|
std::deque<typename CMap::Dart_handle> modified_darts;
|
|
|
|
// For each dart of the i-cell, we modify i-links of neighbors.
|
|
typename std::deque<typename CMap::Dart_handle>::iterator it =
|
|
to_erase.begin();
|
|
for ( ; it!=to_erase.end(); ++it )
|
|
{
|
|
d1 = amap.template beta<i>(*it);
|
|
while ( d1!=amap.null_dart_handle && amap.is_marked(d1, mark) )
|
|
{
|
|
d1 = amap.template beta<imuinv,i>(d1);
|
|
if (d1 == amap.template beta<i>(*it)) d1 = amap.null_dart_handle;
|
|
}
|
|
|
|
if ( !amap.is_marked(d1, mark_modified_darts) )
|
|
{
|
|
d2 = amap.template beta<i-1,i>(*it);
|
|
while ( d2!=amap.null_dart_handle && amap.is_marked(d2, mark) )
|
|
{
|
|
d2 = amap.template beta<i-1,i>(d2);
|
|
if ( d2==amap.template beta<i-1,i>(*it) )
|
|
d2=amap.null_dart_handle;
|
|
}
|
|
|
|
if ( !amap.is_marked(d2, mark_modified_darts) )
|
|
{
|
|
if (d1 != amap.null_dart_handle)
|
|
{
|
|
if (d2 != amap.null_dart_handle && d1!=d2 )
|
|
{
|
|
amap.template basic_link_beta_for_involution<i>(d1, d2);
|
|
amap.mark(d1, mark_modified_darts);
|
|
amap.mark(d2, mark_modified_darts);
|
|
modified_darts.push_back(d1);
|
|
modified_darts.push_back(d2);
|
|
// TODO push only one out of two dart ?
|
|
}
|
|
else
|
|
{
|
|
if ( !amap.template is_free<i>(d1) )
|
|
{
|
|
amap.template unlink_beta<i>(d1);
|
|
CGAL_assertion( !amap.is_marked(d1, mark_modified_darts) );
|
|
amap.mark(d1, mark_modified_darts);
|
|
modified_darts.push_back(d1);
|
|
}
|
|
}
|
|
}
|
|
else if (d2 != amap.null_dart_handle)
|
|
{
|
|
if ( !amap.is_free(d2,i) )
|
|
{
|
|
amap.template unlink_beta<i>(d2);
|
|
CGAL_assertion( !amap.is_marked(d2, mark_modified_darts) );
|
|
amap.mark(d2, mark_modified_darts);
|
|
modified_darts.push_back(d2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (amap.is_free(*it,i-1) && !amap.is_free(*it,i))
|
|
{
|
|
d1 = amap.beta(*it,i);
|
|
if ( !amap.is_free(d1,i) )
|
|
{
|
|
amap.template unlink_beta<i>(d1);
|
|
CGAL_assertion( !amap.is_marked(d1, mark_modified_darts) );
|
|
amap.mark(d1, mark_modified_darts);
|
|
modified_darts.push_back(d1);
|
|
}
|
|
}
|
|
}
|
|
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
// We test the split of all the incident cells for all the non
|
|
// void attributes.
|
|
CMap::Helper::template Foreach_enabled_attributes_except
|
|
<CGAL::internal::Test_split_attribute_functor<CMap,i>, i>::
|
|
run(amap, modified_darts, mark_modified_darts);
|
|
}
|
|
|
|
// We remove all the darts of the i-cell.
|
|
for ( it=to_erase.begin(); it!=to_erase.end(); ++it )
|
|
{ amap.erase_dart(*it); }
|
|
|
|
CGAL_assertion( amap.is_whole_map_unmarked(mark) );
|
|
amap.free_mark(mark);
|
|
|
|
// If no attribute is enabled (or if only i-attributes are enabled),
|
|
// the darts are not unmark by Foreach_enabled_attributes_except.
|
|
// Thus we unmark them now.
|
|
if ( !amap.is_whole_map_unmarked(mark_modified_darts) )
|
|
{
|
|
for ( typename std::deque<typename CMap::Dart_handle>::
|
|
iterator it=modified_darts.begin();
|
|
it!=modified_darts.end(); ++it )
|
|
amap.unmark(*it, mark_modified_darts);
|
|
}
|
|
|
|
CGAL_assertion ( amap.is_whole_map_unmarked(mark_modified_darts) );
|
|
amap.free_mark(mark_modified_darts);
|
|
|
|
#ifdef CGAL_CMAP_TEST_VALID_CONTRACTIONS
|
|
CGAL_assertion( amap.is_valid() );
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
};
|
|
|
|
/** Contract an edge, and merge eventually both incident vertices.
|
|
* @param amap the used combinatorial map.
|
|
* @param adart a dart of the edge to contract.
|
|
* @return the number of deleted darts.
|
|
*/
|
|
template<class CMap>
|
|
struct Contract_cell_functor<CMap,1>
|
|
{
|
|
static size_t run(CMap& amap, typename CMap::Dart_handle adart,
|
|
bool update_attributes)
|
|
{
|
|
CGAL_assertion( (amap.template is_contractible<1>(adart)) );
|
|
|
|
size_t res = 0;
|
|
|
|
typename CMap::Dart_handle d1, d2;
|
|
typename CMap::Dart_handle dg1=amap.null_handle, dg2=amap.null_handle;
|
|
|
|
typename CMap::size_type amark = amap.get_new_mark();
|
|
|
|
// First we store and mark all the darts of the 1-cell to contract.
|
|
std::deque<typename CMap::Dart_handle> to_erase;
|
|
for ( CGAL::CMap_dart_iterator_basic_of_cell<CMap,1> it(amap,adart,amark);
|
|
it.cont(); ++it )
|
|
{
|
|
to_erase.push_back(it);
|
|
if ( dg1==amap.null_handle && !amap.template is_free<0>(it) &&
|
|
!amap.template is_free<1>(it) )
|
|
{ dg1=amap.template beta<0>(it); dg2=amap.template beta<1>(it); }
|
|
amap.mark(it, amark);
|
|
++res;
|
|
}
|
|
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
// We group the two vertices incident if they exist.
|
|
if ( dg1!=amap.null_handle )
|
|
CGAL::internal::Group_attribute_functor_run<CMap, 0, 1>::
|
|
run(amap, dg1, dg2);
|
|
}
|
|
|
|
// During the operation, we store in modified_darts the darts modified
|
|
// by beta0 to test after the loop non void attributes that are split.
|
|
std::deque<typename CMap::Dart_handle> modified_darts;
|
|
// And we store in modified_darts2 all the darts having beta1 modified.
|
|
std::deque<typename CMap::Dart_handle> modified_darts2;
|
|
|
|
// For each dart of the cell, we modify link of neighbors.
|
|
typename std::deque<typename CMap::Dart_handle>::iterator it =
|
|
to_erase.begin();
|
|
for ( ; it!=to_erase.end(); ++it )
|
|
{
|
|
if ( !amap.template is_free<0>(*it) )
|
|
{
|
|
if ( !amap.template is_free<1>(*it) )
|
|
{
|
|
if ( amap.template beta<1>(*it)!=*it )
|
|
{
|
|
/*modified_darts2.push_back((*it)->template beta<0>());
|
|
if ( (*it)->beta(0)!=(*it)->beta(1) )*/
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
if (!amap.is_marked(amap.template beta<1>(*it), amark))
|
|
{ modified_darts.push_back(amap.template beta<1>(*it)); }
|
|
}
|
|
amap.basic_link_beta_1(amap.template beta<0>(*it),
|
|
amap.template beta<1>(*it));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
if (!amap.is_marked(amap.template beta<0>(*it), amark))
|
|
{ modified_darts2.push_back(amap.template beta<0>(*it)); }
|
|
}
|
|
amap.template dart_unlink_beta<1>(amap.template beta<0>(*it));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ( !amap.template is_free<1>(*it) )
|
|
{
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
if (!amap.is_marked(amap.template beta<1>(*it), amark))
|
|
{ modified_darts.push_back(amap.template beta<1>(*it)); }
|
|
}
|
|
amap.template dart_unlink_beta<0>(amap.template beta<1>(*it));
|
|
}
|
|
}
|
|
}
|
|
|
|
// We remove all the darts of the cell.
|
|
for ( it=to_erase.begin(); it!=to_erase.end(); ++it )
|
|
{ amap.erase_dart(*it); }
|
|
|
|
CGAL_assertion( amap.is_whole_map_unmarked(amark) );
|
|
amap.free_mark(amark);
|
|
|
|
if ( amap.are_attributes_automatically_managed() && update_attributes )
|
|
{
|
|
// We test the split of all the incident cells for all the non
|
|
// void attributes.
|
|
CMap::Helper::template Foreach_enabled_attributes_except
|
|
<CGAL::internal::Test_split_attribute_functor<CMap,1>, 1>::
|
|
run(amap, modified_darts, modified_darts2);
|
|
}
|
|
|
|
#ifdef CGAL_CMAP_TEST_VALID_CONTRACTIONS
|
|
CGAL_assertion( amap.is_valid() );
|
|
#endif
|
|
|
|
return res;
|
|
}
|
|
};
|
|
|
|
/** Contract an i-cell, 1<=i<=dimension.
|
|
* @param amap the used combinatorial map.
|
|
* @param adart a dart of the i-cell to remove.
|
|
* @return the number of deleted darts.
|
|
*/
|
|
#ifndef CGAL_NO_DEPRECATED_CODE
|
|
template < class CMap, unsigned int i >
|
|
CGAL_DEPRECATED size_t contract_cell(CMap& amap, typename CMap::Dart_handle adart,
|
|
bool update_attributes)
|
|
{ return CGAL::Contract_cell_functor<CMap,i>::run(amap,adart, update_attributes); }
|
|
#endif // CGAL_NO_DEPRECATED_CODE
|
|
|
|
} // namespace CGAL
|
|
|
|
#endif // CGAL_COMBINATORIAL_MAP_OPERATIONS_H //
|
|
// EOF //
|