FuncGIC.cpp

Tangential_complex

/*    This file is part of the Gudhi Library - https://gudhi.inria.fr/ - which is released under MIT.
 *    See file LICENSE or go to https://gudhi.inria.fr/licensing/ for full license details.
 *    Author(s):       Mathieu Carrière
 *
 *    Copyright (C) 2017 Inria
 *
 *    Modification(s):
 *      - YYYY/MM Author: Description of the modification
 */
 
#include <gudhi/GIC.h>
 
#include <string>
#include <vector>
 
void usage(int nbArgs, char *const progName) {
  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
  std::cerr << "Usage: " << progName << " filename.off function [-v] \n";
  std::cerr << "       i.e.: " << progName << " ../../data/points/COIL_database/lucky_cat.off "
                                              "../../data/points/COIL_database/lucky_cat_PCA1 -v \n";
  exit(-1);  // ----- >>
}
 
int main(int argc, char **argv) {
  if ((argc != 3) && (argc != 4)) usage(argc, argv[0]);
 
  using Point = std::vector<float>;
 
  std::string off_file_name(argv[1]);
  std::string func_file_name = argv[2];
  bool verb = 0;
  if (argc == 4) verb = 1;
 
  // -----------------------------------------
  // Init of a functional GIC from an OFF file
  // -----------------------------------------
 
  Gudhi::cover_complex::Cover_complex<Point> GIC;
  GIC.set_verbose(verb);
 
  bool check = GIC.read_point_cloud(off_file_name);
 
  if (!check) {
    std::clog << "Incorrect OFF file." << std::endl;
  } else {
    GIC.set_type("GIC");
 
    GIC.set_color_from_file(func_file_name);
    GIC.set_function_from_file(func_file_name);
 
    GIC.set_graph_from_automatic_rips(Gudhi::Euclidean_distance());
    GIC.set_automatic_resolution();
    GIC.set_gain();
    GIC.set_cover_from_function();
 
    GIC.find_simplices();
 
    GIC.plot_DOT();
 
    Gudhi::Simplex_tree<> stree;
    GIC.create_complex(stree);
 
    // --------------------------------------------
    // Display information about the functional GIC
    // --------------------------------------------
 
    if (verb) {
      std::clog << "Functional GIC is of dimension " << stree.dimension() << " - " << stree.num_simplices()
                << " simplices - " << stree.num_vertices() << " vertices." << std::endl;
 
      std::clog << "Iterator on functional GIC simplices" << std::endl;
      for (auto f_simplex : stree.filtration_simplex_range()) {
        for (auto vertex : stree.simplex_vertex_range(f_simplex)) {
          std::clog << vertex << " ";
        }
        std::clog << std::endl;
      }
    }
  }
 
  return 0;
}