Alpha_complex/Alpha_complex_from_off.cpp
#include <gudhi/Alpha_complex.h>
// to construct a simplex_tree from alpha complex
#include <gudhi/Simplex_tree.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
// ----------------------------------------------------------------------------
using Kernel = CGAL::Epick_d< CGAL::Dynamic_dimension_tag >;
Gudhi::alpha_complex::Alpha_complex<Kernel> alpha_complex_from_file(off_file_name);
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();
}
if (alpha_complex_from_file.create_complex(simplex, alpha_square_max_value)) {
std::ostream output_stream(streambufffer);
// ----------------------------------------------------------------------------
// Display information about the alpha complex
// ----------------------------------------------------------------------------
output_stream << "Alpha complex is of dimension " << simplex.dimension() <<
" - " << simplex.num_simplices() << " simplices - " <<
simplex.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 : simplex.filtration_simplex_range()) {
output_stream << " ( ";
for (auto vertex : simplex.simplex_vertex_range(f_simplex)) {
output_stream << vertex << " ";
}
output_stream << ") -> " << "[" << simplex.filtration(f_simplex) << "] ";
output_stream << std::endl;
}
}
ouput_file_stream.close();
return 0;
}
GUDHI  Version 2.0.0  - C++ library for Topological Data Analysis (TDA) and Higher Dimensional Geometry Understanding. Generated on Wed Apr 19 2017 22:26:16 for GUDHI by doxygen 1.8.11