Arrangement_on_surface_2/Bezier_curves.cpp

// Constructing an arrangement of Bezier curves.

#include <CGAL/config.h>

#ifndef CGAL_USE_CORE
#include <iostream>
int main ()
{
  std::cout << "Sorry, this example needs CORE ..." << std::endl; 
  return 0;
}
#else

#include <CGAL/Cartesian.h>
#include <CGAL/CORE_algebraic_number_traits.h>
#include <CGAL/Arr_Bezier_curve_traits_2.h>
#include <CGAL/Arrangement_2.h>

typedef CGAL::CORE_algebraic_number_traits              Nt_traits;
typedef Nt_traits::Rational                             NT;
typedef Nt_traits::Rational                             Rational;
typedef Nt_traits::Algebraic                            Algebraic;
typedef CGAL::Cartesian<Rational>                       Rat_kernel;
typedef CGAL::Cartesian<Algebraic>                      Alg_kernel;
typedef Rat_kernel::Point_2                             Rat_point_2;
typedef CGAL::Arr_Bezier_curve_traits_2<Rat_kernel, Alg_kernel, Nt_traits>
                                                        Traits_2;
typedef Traits_2::Curve_2                               Bezier_curve_2;
typedef CGAL::Arrangement_2<Traits_2>                   Arrangement_2;

int main (int argc, char *argv[])
{
  // Get the name of the input file from the command line, or use the default
  // Bezier.dat file if no command-line parameters are given.
  const char   *filename = (argc > 1) ? argv[1] : "Bezier.dat";

  // Open the input file.
  std::ifstream   in_file (filename);

  if (! in_file.is_open()) {
    std::cerr << "Failed to open " << filename << std::endl;
    return 1;
  }

  // Read the curves from the input file.
  unsigned int               n_curves;
  std::list<Bezier_curve_2>  curves;
  Bezier_curve_2             B;
  unsigned int               k;
  
  in_file >> n_curves;
  for (k = 0; k < n_curves; k++) {
    // Read the current curve (specified by its control points).
    in_file >> B;
    curves.push_back (B);

    std::cout << "B = {" << B << "}" << std::endl;
  }

  // Construct the arrangement.
  Arrangement_2                     arr;
  insert (arr, curves.begin(), curves.end());

  // Print the arrangement size.
  std::cout << "The arrangement size:" << std::endl
            << "   V = " << arr.number_of_vertices()
            << ",  E = " << arr.number_of_edges() 
            << ",  F = " << arr.number_of_faces() << std::endl;

  return 0;
}

#endif