\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.8 - 2D Arrangements

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Arrangement_on_surface_2/io.cpp
// Using the arrangement I/O operators.
#include <CGAL/Cartesian.h>
#include <CGAL/Exact_rational.h>
#include <CGAL/Arr_segment_traits_2.h>
#include <CGAL/Arrangement_2.h>
#include <CGAL/IO/Arr_iostream.h>
#include <fstream>
#include "point_location_utils.h"
typedef CGAL::Cartesian<CGAL::Exact_rational> Kernel;
typedef CGAL::Arr_segment_traits_2<Kernel> Traits_2;
typedef CGAL::Arrangement_2<Traits_2> Arrangement_2;
int main ()
{
// Construct the arrangement.
Arrangement_2 arr;
construct_segments_arr (arr);
std::cout << "Writing an arrangement of size:" << std::endl
<< " V = " << arr.number_of_vertices()
<< ", E = " << arr.number_of_edges()
<< ", F = " << arr.number_of_faces() << std::endl;
// Write the arrangement to a file.
std::ofstream out_file ("arr_ex_io.dat");
out_file << arr;
out_file.close();
// Read the arrangement from the file.
Arrangement_2 arr2;
std::ifstream in_file ("arr_ex_io.dat");
in_file >> arr2;
in_file.close();
std::cout << "Read an arrangement of size:" << std::endl
<< " V = " << arr2.number_of_vertices()
<< ", E = " << arr2.number_of_edges()
<< ", F = " << arr2.number_of_faces() << std::endl;
return (0);
}