add Algo/Topo/basic.h

include/Algo/Topo/basic.h

+/*******************************************************************************
+* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
+* version 0.1                                                                  *
+* Copyright (C) 2009-2012, IGG Team, LSIIT, University of Strasbourg           *
+*                                                                              *
+* This library is free software; 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 2.1 of the License, or (at your     *
+* option) any later version.                                                   *
+*                                                                              *
+* This library is distributed in the hope that it will be useful, but WITHOUT  *
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *
+* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License  *
+* for more details.                                                            *
+*                                                                              *
+* You should have received a copy of the GNU Lesser General Public License     *
+* along with this library; if not, write to the Free Software Foundation,      *
+* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
+*                                                                              *
+* Web site: http://cgogn.unistra.fr/                                           *
+* Contact information: cgogn@unistra.fr                                        *
+*                                                                              *
+*******************************************************************************/
+
+#ifndef __ALGO_TOPO_BASIC__
+#define __ALGO_TOPO_BASIC__
+
+#include "Topology/generic/attributeHandler.h"
+#include "Topology/generic/traversor/traversorCell.h"
+
+namespace CGoGN
+{
+
+namespace Algo
+{
+
+namespace Topo
+{
+
+template <unsigned int ORBIT, typename MAP>
+bool foreach_orbit(const MAP& map, FunctorType& fonct, unsigned int thread = 0)
+{
+	TraversorCell<MAP, ORBIT> trav(map, true, thread);
+	bool found = false;
+
+	for (Dart d = trav.begin(); !found && d != trav.end(); d = trav.next())
+	{
+		if ((fonct)(d))
+			found = true;
+	}
+	return found;
+}
+
+template <unsigned int ORBIT, typename MAP>
+unsigned int getNbOrbits(const MAP& map)
+{
+	unsigned int cpt = 0;
+	TraversorCell<MAP, ORBIT> trav(map, true);
+	for (Dart d = trav.begin(); d != trav.end(); d = trav.next())
+		++cpt;
+	return cpt;
+}
+
+template <typename MAP>
+unsigned int getNbOrbits(const MAP& map, unsigned int orbit)
+{
+	switch(orbit)
+	{
+		case DART:		return getNbOrbits<DART, MAP>(map);
+		case VERTEX: 	return getNbOrbits<VERTEX, MAP>(map);
+		case EDGE: 		return getNbOrbits<EDGE, MAP>(map);
+		case FACE: 		return getNbOrbits<FACE, MAP>(map);
+		case VOLUME: 	return getNbOrbits<VOLUME, MAP>(map);
+		case VERTEX1: 	return getNbOrbits<VERTEX1, MAP>(map);
+		case EDGE1: 	return getNbOrbits<EDGE1, MAP>(map);
+		case VERTEX2: 	return getNbOrbits<VERTEX2, MAP>(map);
+		case EDGE2:		return getNbOrbits<EDGE2, MAP>(map);
+		case FACE2:		return getNbOrbits<FACE2, MAP>(map);
+		default: 		assert(!"Cells of this dimension are not handled"); break;
+	}
+	return 0;
+}
+
+/**
+ * Traverse the map and embed all orbits of the given dimension with a new cell
+ * @param realloc if true -> all the orbits are embedded on new cells, if false -> already embedded orbits are not impacted
+ */
+template <unsigned int ORBIT, typename MAP>
+void initAllOrbitsEmbedding(MAP& map, bool realloc = false)
+{
+	if(!map.template isOrbitEmbedded<ORBIT>())
+		map.template addEmbedding<ORBIT>() ;
+
+	TraversorCell<MAP, ORBIT> trav(map, true);
+	for(Dart d = trav.begin(); d != trav.end(); d = trav.next())
+	{
+		if(realloc || map.template getEmbedding<ORBIT>(d) == EMBNULL)
+			map.template setOrbitEmbeddingOnNewCell<ORBIT>(d) ;
+	}
+}
+
+/**
+ * use the given attribute to store the indices of the cells of the corresponding orbit
+ * @return the number of cells of the orbit
+ */
+template <unsigned int ORBIT, typename MAP>
+unsigned int computeIndexCells(MAP& map, AttributeHandler<unsigned int, ORBIT, typename MAP::IMPL>& idx)
+{
+	AttributeContainer& cont = map.template getAttributeContainer<ORBIT>();
+	unsigned int cpt = 0 ;
+	for (unsigned int i = cont.begin(); i != cont.end(); cont.next(i))
+		idx[i] = cpt++ ;
+	return cpt ;
+}
+
+/**
+ * ensure that each embedding is pointed by only one orbit
+ */
+template <unsigned int ORBIT, typename MAP>
+void bijectiveOrbitEmbedding(MAP& map)
+{
+	if(!map.template isOrbitEmbedded<ORBIT>())
+		map.template addEmbedding<ORBIT>() ;
+
+	AttributeHandler<int, ORBIT, typename MAP::IMPL> counter = map.template addAttribute<int, ORBIT>("tmpCounter") ;
+	counter.setAllValues(int(0)) ;
+
+	TraversorCell<MAP, ORBIT> trav(map, true);
+	for(Dart d = trav.begin(); d != trav.end(); d = trav.next())
+	{
+		unsigned int emb = map.template getEmbedding<ORBIT>(d) ;
+		if (emb != EMBNULL)
+		{
+			if (counter[d] > 0)
+			{
+				unsigned int newEmb = map.template setOrbitEmbeddingOnNewCell<ORBIT>(d) ;
+				map.template copyCell<ORBIT>(newEmb, emb) ;
+			}
+			counter[d]++ ;
+		}
+	}
+
+	map.removeAttribute(counter) ;
+}
+
+} // namespace Topo
+
+} // namespace Algo
+
+} // namespace CGoGN
+
+#endif