diff options
Diffstat (limited to 'src/Alpha_complex/example/Alpha_complex_from_off.cpp')
-rw-r--r-- | src/Alpha_complex/example/Alpha_complex_from_off.cpp | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/Alpha_complex/example/Alpha_complex_from_off.cpp b/src/Alpha_complex/example/Alpha_complex_from_off.cpp new file mode 100644 index 00000000..963ef5ca --- /dev/null +++ b/src/Alpha_complex/example/Alpha_complex_from_off.cpp @@ -0,0 +1,56 @@ +#include <gudhi/Alpha_complex.h> +#include <CGAL/Epick_d.h> + +#include <iostream> +#include <string> + +void usage(int nbArgs, char * const progName) { + std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n"; + std::cerr << "Usage: " << progName << " filename.off alpha_square_max_value [ouput_file.txt]\n"; + std::cerr << " i.e.: " << progName << " ../../data/points/alphacomplexdoc.off 60.0\n"; + exit(-1); // ----- >> +} + +int main(int argc, char **argv) { + if ((argc != 3) && (argc != 4)) usage(argc, (argv[0] - 1)); + + std::string off_file_name(argv[1]); + double alpha_square_max_value = atof(argv[2]); + + // ---------------------------------------------------------------------------- + // Init of an alpha complex from an OFF file + // ---------------------------------------------------------------------------- + typedef CGAL::Epick_d< CGAL::Dynamic_dimension_tag > Kernel; + Gudhi::alphacomplex::Alpha_complex<Kernel> alpha_complex_from_file(off_file_name, alpha_square_max_value); + + std::streambuf* streambufffer; + std::ofstream ouput_file_stream; + + if (argc == 4) { + ouput_file_stream.open(std::string(argv[3])); + streambufffer = ouput_file_stream.rdbuf(); + } else { + streambufffer = std::cout.rdbuf(); + } + + std::ostream output_stream(streambufffer); + + // ---------------------------------------------------------------------------- + // Display information about the alpha complex + // ---------------------------------------------------------------------------- + output_stream << "Alpha complex is of dimension " << alpha_complex_from_file.dimension() << + " - " << alpha_complex_from_file.num_simplices() << " simplices - " << + alpha_complex_from_file.num_vertices() << " vertices." << std::endl; + + output_stream << "Iterator on alpha complex simplices in the filtration order, with [filtration value]:" << std::endl; + for (auto f_simplex : alpha_complex_from_file.filtration_simplex_range()) { + output_stream << " ( "; + for (auto vertex : alpha_complex_from_file.simplex_vertex_range(f_simplex)) { + output_stream << vertex << " "; + } + output_stream << ") -> " << "[" << alpha_complex_from_file.filtration(f_simplex) << "] "; + output_stream << std::endl; + } + ouput_file_stream.close(); + return 0; +} |