template<typename Point_3>
class Gudhi::Points_3D_off_reader< Point_3 >
@brief OFF file reader implementation in order to read dimension 3 points from an OFF file.
This class is using the Points_3D_off_visitor_reader to visit the OFF file according to Off_reader.
Point_3 must have a constructor with the following form:
template<class InputIterator > Point_3::Point_3(double x, double y, double z)
Example
This example loads points from an OFF file and builds a vector of CGAL points in dimension 3. Then, it is asked to display the points.
#include <gudhi/Points_3D_off_io.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <iostream>
#include <string>
#include <vector>
using Kernel = CGAL::Exact_predicates_inexact_constructions_kernel;
using Point_3 = Kernel::Point_3;
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]);
if (!off_reader.is_valid()) {
std::cerr << "Unable to read file " << off_input_file << std::endl;
usage(argv[0]);
}
std::vector<Point_3> point_cloud = off_reader.get_point_cloud();
int n {};
for (auto point : point_cloud) {
++n;
std::cout << "Point[" << n << "] = (" << point[0] << ", " << point[1] << ", " << point[2] << ")\n";
}
return 0;
}
When launching:
$> ./cgal3Doffreader ../../data/points/tore3D_300.off
the program output is:
Point[1] = (0.959535, -0.418347, 0.302237)
Point[2] = (2.16795, 1.85348, -0.52312)
Point[3] = (-2.38753, -1.50911, -0.565889)
Point[4] = (-2.70428, -1.25688, 0.188394)
Point[5] = (-1.22932, -1.64337, -0.998632)
...
Point[300] = (-0.56244, 2.6018, -0.749591)
- Examples:
- Alpha_complex/alpha_complex_3d_persistence.cpp, common/example_CGAL_3D_points_off_reader.cpp, and Simplex_tree/example_alpha_shapes_3_simplex_tree_from_off_file.cpp.
