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Diffstat (limited to 'src/Alpha_shapes/example/Simplex_tree_from_delaunay_triangulation.cpp')
-rw-r--r-- | src/Alpha_shapes/example/Simplex_tree_from_delaunay_triangulation.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/Alpha_shapes/example/Simplex_tree_from_delaunay_triangulation.cpp b/src/Alpha_shapes/example/Simplex_tree_from_delaunay_triangulation.cpp new file mode 100644 index 00000000..3a17b519 --- /dev/null +++ b/src/Alpha_shapes/example/Simplex_tree_from_delaunay_triangulation.cpp @@ -0,0 +1,103 @@ +/* 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) 2014 INRIA Saclay (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/>. + */ + +// to construct a Delaunay_triangulation from a OFF file +#include "gudhi/Alpha_shapes/Delaunay_triangulation_off_io.h" +#include "gudhi/Alpha_shapes.h" + +// to construct a simplex_tree from Delaunay_triangulation +#include "gudhi/graph_simplicial_complex.h" +#include "gudhi/Simplex_tree.h" + +#include <CGAL/Delaunay_triangulation.h> +#include <CGAL/Epick_d.h> +#include <CGAL/point_generators_d.h> +#include <CGAL/algorithm.h> +#include <CGAL/assertions.h> + +#include <iostream> +#include <iterator> + +#include <stdio.h> +#include <stdlib.h> +#include <string> + +// Use dynamic_dimension_tag for the user to be able to set dimension +typedef CGAL::Epick_d< CGAL::Dynamic_dimension_tag > K; +typedef CGAL::Delaunay_triangulation<K> T; +// The triangulation uses the default instanciation of the +// TriangulationDataStructure template parameter + +void usage(char * const progName) { + std::cerr << "Usage: " << progName << " filename.off dimension" << std::endl; + exit(-1); // ----- >> +} + +int main(int argc, char **argv) { + if (argc != 3) { + std::cerr << "Error: Number of arguments (" << argc << ") is not correct" << std::endl; + usage(argv[0]); + } + + int dimension = 0; + int returnedScanValue = sscanf(argv[2], "%d", &dimension); + if ((returnedScanValue == EOF) || (dimension <= 0)) { + std::cerr << "Error: " << argv[2] << " is not correct" << std::endl; + usage(argv[0]); + } + + // ---------------------------------------------------------------------------- + // + // Init of an alpha-shape from a Delaunay triangulation + // + // ---------------------------------------------------------------------------- + T dt(dimension); + std::string off_file_name(argv[1]); + + Gudhi::alphashapes::Delaunay_triangulation_off_reader<T> off_reader(off_file_name, dt, false, false); + if (!off_reader.is_valid()) { + std::cerr << "Unable to read file " << off_file_name << std::endl; + exit(-1); // ----- >> + } + + std::cout << "number of vertices=" << dt.number_of_vertices() << std::endl; + std::cout << "number of full cells=" << dt.number_of_full_cells() << std::endl; + std::cout << "number of finite full cells=" << dt.number_of_finite_full_cells() << std::endl; + + Gudhi::alphashapes::Alpha_shapes alpha_shapes_from_dt(dt); + //std::cout << alpha_shapes_from_dt << std::endl; + + // ---------------------------------------------------------------------------- + // + // Init of an alpha-shape from a OFF file + // + // ---------------------------------------------------------------------------- + Gudhi::alphashapes::Alpha_shapes alpha_shapes_from_file(off_file_name, dimension); + //std::cout << alpha_shapes_from_file << std::endl; + + std::cout << "alpha_shapes_from_file.dimension()=" << alpha_shapes_from_file.dimension() << std::endl; + std::cout << "alpha_shapes_from_file.filtration()=" << alpha_shapes_from_file.filtration() << std::endl; + std::cout << "alpha_shapes_from_file.num_simplices()=" << alpha_shapes_from_file.num_simplices() << std::endl; + std::cout << "alpha_shapes_from_file.num_vertices()=" << alpha_shapes_from_file.num_vertices() << std::endl; + + return 0; +}
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