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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): David Salinas
*
* Copyright (C) 2014 INRIA Sophia Antipolis-Mediterranee (France)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TOP_FACES_H_
#define TOP_FACES_H_
#include <list>
#include <vector>
#include <set>
template<typename SimplexHandle>
std::list<SimplexHandle> subfaces(SimplexHandle top_face){
std::list<SimplexHandle> res;
if(top_face.dimension()==-1) return res;
if(top_face.dimension()==0) {
res.push_back(top_face);
return res;
}
else{
auto first_vertex = top_face.first_vertex();
top_face.remove_vertex(first_vertex);
res = subfaces(top_face);
std::list<SimplexHandle> copy = res;
for(auto& simplex : copy){
simplex.add_vertex(first_vertex);
}
res.push_back(SimplexHandle(first_vertex));
res.splice(res.end(),copy);
return res;
}
}
/**
* add all faces of top_face in simplices_per_dimension
*/
template<typename SimplexHandle>
void register_faces(
std::vector< std::set<SimplexHandle> >& simplices_per_dimension,
const SimplexHandle& top_face){
std::list<SimplexHandle> subfaces_list = subfaces(top_face);
for(auto& simplex : subfaces_list ){
simplices_per_dimension[simplex.dimension()].insert(simplex);
}
}
#endif /* TOP_FACES_H_ */
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