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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
+