4.4/Property_map/Point_set_processing_3_2read_write_xyz_point_set_example_8cpp-example.html

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

#include <CGAL/property_map.h>

#include <CGAL/IO/read_xyz_points.h>

#include <CGAL/IO/write_xyz_points.h>


#include <utility> // defines std::pair

#include <vector>

#include <fstream>


// types

typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;

typedef Kernel::Point_3 Point;

typedef Kernel::Vector_3 Vector;


// Point with normal vector stored as a std::pair.

typedef std::pair<Point, Vector> Pwn;


int main(void)

{

    // Reads a .xyz point set file in points[].

    // Note: read_xyz_points_and_normals() requires an output iterator

    // over points and as well as property maps to access each

    // point position and normal.

    std::vector<Pwn> points;

    std::ifstream in("data/oni.xyz");

    if (!in ||

        !CGAL::read_xyz_points_and_normals(

            in,std::back_inserter(points),

            CGAL::First_of_pair_property_map<Pwn>(),

            CGAL::Second_of_pair_property_map<Pwn>()))

    {

      std::cerr << "Error: cannot read file data/oni.xyz" << std::endl;

      return EXIT_FAILURE;

    }


    // Saves point set.

    // Note: write_xyz_points_and_normals() requires an output iterator

    // over points as well as property maps to access each

    // point position and normal.

    std::ofstream out("oni_copy.xyz");

    if (!out ||

        !CGAL::write_xyz_points_and_normals(

            out, points.begin(), points.end(),

            CGAL::First_of_pair_property_map<Pwn>(),

            CGAL::Second_of_pair_property_map<Pwn>()))

    {

      return EXIT_FAILURE;

    }


    return EXIT_SUCCESS;

}