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#include <iostream>
#include <string>
#include <QtGui/QApplication>
// to construct a Delaunay_triangulation from a OFF file
#include <gudhi/Delaunay_triangulation_off_io.h>
#include <gudhi/Alpha_complex.h>
#include <gudhi/Persistent_cohomology.h>
#include "utils/Bar_code_persistence.h"
void usage(char * const progName) {
std::cerr << "Usage: " << progName << " filename.off " << // alpha_square_max_value[double] " <<
"coeff_field_characteristic[integer > 0] min_persistence[double >= -1.0]" << std::endl;
std::cerr << " i.e.: " << progName << " ../../data/points/alphacomplexdoc.off 60.0 2 0.02" << std::endl;
exit(-1); // ----- >>
}
int main(int argc, char **argv) {
if (argc != 4) {
std::cerr << "Error: Number of arguments (" << argc << ") is not correct" << std::endl;
usage(argv[0]);
}
QApplication qtapp(argc, argv);
std::string off_file_name(argv[1]);
// double alpha_square_max_value = atof(argv[2]);
double alpha_square_max_value = 1e20;
int coeff_field_characteristic = atoi(argv[2]); // argv[3]
double min_persistence = atof(argv[3]); // argv[4]
// ----------------------------------------------------------------------------
// 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);
// ----------------------------------------------------------------------------
// Display information about the alpha complex
// ----------------------------------------------------------------------------
std::cout << "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;
// Sort the simplices in the order of the filtration
alpha_complex_from_file.initialize_filtration();
std::cout << "Simplex_tree dim: " << alpha_complex_from_file.dimension() << std::endl;
// Compute the persistence diagram of the complex
Gudhi::persistent_cohomology::Persistent_cohomology< Gudhi::alphacomplex::Alpha_complex<Kernel>,
Gudhi::persistent_cohomology::Field_Zp > pcoh(alpha_complex_from_file);
std::cout << "coeff_field_characteristic " << coeff_field_characteristic <<
" - min_persistence " << min_persistence << std::endl;
// initializes the coefficient field for homology
pcoh.init_coefficients(coeff_field_characteristic);
pcoh.compute_persistent_cohomology(min_persistence);
pcoh.output_diagram();
std::vector<std::pair<double, double>> persistence_vector;
pcoh.get_persistence(persistence_vector);
Bar_code_persistence bc_persistence;
for (auto persistence : persistence_vector) {
bc_persistence.insert(persistence.first, persistence.second);
}
bc_persistence.show();
return qtapp.exec();
}
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