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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 INCLUDE_SUBSAMPLING_INTERFACE_H_
+#define INCLUDE_SUBSAMPLING_INTERFACE_H_
+
+#include <gudhi/choose_n_farthest_points.h>
+#include <gudhi/pick_n_random_points.h>
+#include <gudhi/sparsify_point_set.h>
+#include <gudhi/Points_off_io.h>
+#include <CGAL/Epick_d.h>
+
+#include <iostream>
+#include <vector>
+#include <string>
+
+namespace Gudhi {
+
+namespace subsampling {
+
+using Subsampling_dynamic_kernel = CGAL::Epick_d< CGAL::Dynamic_dimension_tag >;
+using Subsampling_point_d = Subsampling_dynamic_kernel::Point_d;
+using Subsampling_ft = Subsampling_dynamic_kernel::FT;
+
+// ------ choose_n_farthest_points ------
+std::vector<std::vector<double>> subsampling_n_farthest_points(const std::vector<std::vector<double>>& points,
+ unsigned nb_points) {
+ std::vector<std::vector<double>> landmarks;
+ Subsampling_dynamic_kernel k;
+ choose_n_farthest_points(k, points, nb_points, random_starting_point, std::back_inserter(landmarks));
+
+ return landmarks;
+}
+
+std::vector<std::vector<double>> subsampling_n_farthest_points(const std::vector<std::vector<double>>& points,
+ unsigned nb_points, unsigned starting_point) {
+ std::vector<std::vector<double>> landmarks;
+ Subsampling_dynamic_kernel k;
+ choose_n_farthest_points(k, points, nb_points, starting_point, std::back_inserter(landmarks));
+
+ return landmarks;
+}
+
+std::vector<std::vector<double>> subsampling_n_farthest_points_from_file(const std::string& off_file,
+ unsigned nb_points) {
+ Gudhi::Points_off_reader<std::vector<double>> off_reader(off_file);
+ std::vector<std::vector<double>> points = off_reader.get_point_cloud();
+ return subsampling_n_farthest_points(points, nb_points);
+}
+
+std::vector<std::vector<double>> subsampling_n_farthest_points_from_file(const std::string& off_file,
+ unsigned nb_points, unsigned starting_point) {
+ Gudhi::Points_off_reader<std::vector<double>> off_reader(off_file);
+ std::vector<std::vector<double>> points = off_reader.get_point_cloud();
+ return subsampling_n_farthest_points(points, nb_points, starting_point);
+}
+
+// ------ pick_n_random_points ------
+std::vector<std::vector<double>> subsampling_n_random_points(const std::vector<std::vector<double>>& points,
+ unsigned nb_points) {
+ std::vector<std::vector<double>> landmarks;
+ pick_n_random_points(points, nb_points, std::back_inserter(landmarks));
+
+ return landmarks;
+}
+
+std::vector<std::vector<double>> subsampling_n_random_points_from_file(const std::string& off_file,
+ unsigned nb_points) {
+ Gudhi::Points_off_reader<std::vector<double>> off_reader(off_file);
+ std::vector<std::vector<double>> points = off_reader.get_point_cloud();
+ return subsampling_n_random_points(points, nb_points);
+}
+
+// ------ sparsify_point_set ------
+std::vector<std::vector<double>> subsampling_sparsify_points(const std::vector<std::vector<double>>& points,
+ double min_squared_dist) {
+ std::vector<Subsampling_point_d> input, output;
+ for (auto point : points)
+ input.push_back(Subsampling_point_d(point.size(), point.begin(), point.end()));
+ Subsampling_dynamic_kernel k;
+ sparsify_point_set(k, input, min_squared_dist, std::back_inserter(output));
+
+ std::vector<std::vector<double>> landmarks;
+ for (auto point : output)
+ landmarks.push_back(std::vector<double>(point.cartesian_begin(), point.cartesian_end()));
+ return landmarks;
+}
+
+std::vector<std::vector<double>> subsampling_sparsify_points_from_file(const std::string& off_file,
+ double min_squared_dist) {
+ Gudhi::Points_off_reader<std::vector<double>> off_reader(off_file);
+ std::vector<std::vector<double>> points = off_reader.get_point_cloud();
+ return subsampling_sparsify_points(points, min_squared_dist);
+}
+
+} // namespace subsampling
+
+} // namespace Gudhi
+
+#endif // INCLUDE_SUBSAMPLING_INTERFACE_H_