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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): Vincent Rouvreau
*
* Copyright (C) 2016 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 ALPHA_COMPLEX_INTERFACE_H
#define ALPHA_COMPLEX_INTERFACE_H
#include <gudhi/Alpha_complex.h>
#include <CGAL/Epick_d.h>
#include <vector>
#include <utility> // std::pair
#include <iostream>
namespace Gudhi {
namespace alpha_complex {
class Alpha_complex_interface : public Alpha_complex< CGAL::Epick_d< CGAL::Dynamic_dimension_tag > > {
using Alpha_complex = Alpha_complex< CGAL::Epick_d< CGAL::Dynamic_dimension_tag > > ;
typedef typename Alpha_complex::Simplex_handle Simplex_handle;
typedef typename std::pair<Simplex_handle, bool> Insertion_result;
using Simplex = std::vector<Vertex_handle>;
using Filtered_complex = std::pair<Simplex, Filtration_value>;
using Complex_tree = std::vector<Filtered_complex>;
using Point_d = Alpha_complex::Point_d;
public:
Alpha_complex_interface(std::vector<std::vector<double>>&points, double max_alpha_square)
: Alpha_complex(points, max_alpha_square) {
}
// bool from_file is a workaround fro cython to find the correct signature
Alpha_complex_interface(const std::string& off_file, double max_alpha_square, bool from_file)
: Alpha_complex(off_file, max_alpha_square) {
}
bool find_simplex(const Simplex& vh) {
return (Alpha_complex::find(vh) != Alpha_complex::null_simplex());
}
bool insert_simplex_and_subfaces(const Simplex& complex, Filtration_value filtration = 0) {
Insertion_result result = Alpha_complex::insert_simplex_and_subfaces(complex, filtration);
return (result.second);
}
Filtration_value simplex_filtration(const Simplex& complex) {
return Alpha_complex::filtration(Alpha_complex::find(complex));
}
void remove_maximal_simplex(const Simplex& complex) {
return Alpha_complex::remove_maximal_simplex(Alpha_complex::find(complex));
}
Complex_tree get_filtered_tree() {
Complex_tree filtered_tree;
for (auto f_simplex : Alpha_complex::filtration_simplex_range()) {
Simplex simplex;
for (auto vertex : Alpha_complex::simplex_vertex_range(f_simplex)) {
simplex.insert(simplex.begin(), vertex);
}
filtered_tree.push_back(std::make_pair(simplex, Alpha_complex::filtration(f_simplex)));
}
return filtered_tree;
}
Complex_tree get_skeleton_tree(int dimension) {
Complex_tree skeleton_tree;
for (auto f_simplex : Alpha_complex::skeleton_simplex_range(dimension)) {
Simplex simplex;
for (auto vertex : Alpha_complex::simplex_vertex_range(f_simplex)) {
simplex.insert(simplex.begin(), vertex);
}
skeleton_tree.push_back(std::make_pair(simplex, Alpha_complex::filtration(f_simplex)));
}
return skeleton_tree;
}
Complex_tree get_star_tree(const Simplex& complex) {
Complex_tree star_tree;
for (auto f_simplex : Alpha_complex::star_simplex_range(Alpha_complex::find(complex))) {
Simplex simplex;
for (auto vertex : Alpha_complex::simplex_vertex_range(f_simplex)) {
simplex.insert(simplex.begin(), vertex);
}
star_tree.push_back(std::make_pair(simplex, Alpha_complex::filtration(f_simplex)));
}
return star_tree;
}
Complex_tree get_coface_tree(const Simplex& complex, int dimension) {
Complex_tree coface_tree;
for (auto f_simplex : Alpha_complex::cofaces_simplex_range(Alpha_complex::find(complex), dimension)) {
Simplex simplex;
for (auto vertex : Alpha_complex::simplex_vertex_range(f_simplex)) {
simplex.insert(simplex.begin(), vertex);
}
coface_tree.push_back(std::make_pair(simplex, Alpha_complex::filtration(f_simplex)));
}
return coface_tree;
}
std::vector<double> get_point(int vh) {
std::vector<double> vd;
try {
Point_d ph = Alpha_complex::get_point(vh);
for (auto coord = ph.cartesian_begin(); coord < ph.cartesian_end(); coord++)
vd.push_back(*coord);
} catch (std::out_of_range outofrange) {
// std::out_of_range is thrown in case not found. Other exceptions must be re-thrown
}
return vd;
}
};
} // namespace alpha_complex
} // namespace Gudhi
#endif // ALPHA_COMPLEX_INTERFACE_H
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