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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
*
* 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 CONTRACTION_POLICIES_EDGE_LENGTH_COST_H_
#define CONTRACTION_POLICIES_EDGE_LENGTH_COST_H_
#include <gudhi/Contraction/policies/Cost_policy.h>
namespace Gudhi {
namespace contraction {
/**
* @brief return a cost corresponding to the squared length of the edge
*/
template< typename EdgeProfile>
class Edge_length_cost : public Cost_policy<EdgeProfile> {
public:
typedef typename Cost_policy<EdgeProfile>::Cost_type Cost_type;
typedef typename EdgeProfile::Point Point;
Cost_type operator()(const EdgeProfile& profile, const boost::optional<Point>& placement) const override {
double res = 0;
auto p0_coord = profile.p0().begin();
auto p1_coord = profile.p1().begin();
for (; p0_coord != profile.p0().end(); p0_coord++, p1_coord++) {
res += (*p0_coord - *p1_coord) * (*p0_coord - *p1_coord);
}
return res;
}
};
} // namespace contraction
} // namespace Gudhi
#endif // CONTRACTION_POLICIES_EDGE_LENGTH_COST_H_
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