example_vector_double_points_off_reader.cpp

#include <gudhi/Points_off_io.h>
 
#include <iostream>
#include <string>
#include <vector>
 
using Point_d = std::vector<double>;
 
void usage(char * const progName) {
  std::cerr << "Usage: " << progName << " inputFile.off" << std::endl;
  exit(-1);
}
 
int main(int argc, char **argv) {
  if (argc != 2) {
    std::cerr << "Error: Number of arguments (" << argc << ") is not correct" << std::endl;
    usage(argv[0]);
  }
 
  std::string off_input_file(argv[1]);
  // Read the OFF file (input file name given as parameter) and triangulate points
  Gudhi::Points_off_reader<Point_d> off_reader(off_input_file);
  // Check the read operation was correct
  if (!off_reader.is_valid()) {
    std::cerr << "Unable to read file " << off_input_file << std::endl;
    usage(argv[0]);
  }
 
  // Retrieve the triangulation
  std::vector<Point_d> point_cloud = off_reader.get_point_cloud();
 
  std::ofstream output_file(off_input_file + ".txt");
  int n {0};
  for (auto point : point_cloud) {
    output_file << "Point[" << n << "] = ";
    for (std::size_t i {0}; i < point.size(); i++)
      output_file << point[i] << " ";
    output_file << "\n";
    ++n;
  }
  output_file.close();
  return 0;
}