Arrangement_on_surface_2/ellipses.cpp

 
// Constructing an arrangement of various conic arcs.
 
#include <CGAL/config.h>
 
#ifdef CGAL_USE_CORE
 
#include <CGAL/draw_arrangement_2.h>
 
#include "arr_conics.h"
#include "arr_print.h"
 
int main() {
  Traits traits;
  Arrangement arr(&traits);
 
  auto ctr_cv = traits.construct_curve_2_object();
 
  // Insert a full x-major ellipse
  CGAL::insert(arr, ctr_cv(1, 4, 0, 0, 0, -16, CGAL::COUNTERCLOCKWISE, Point(4, 0), Point(0, 2)));
  CGAL::insert(arr, ctr_cv(1, 4, 0, 0, 0, -16, CGAL::COUNTERCLOCKWISE, Point(0, 2), Point(-4, 0)));
  CGAL::insert(arr, ctr_cv(1, 4, 0, 0, 0, -16, CGAL::COUNTERCLOCKWISE, Point(-4, 0), Point(0, -2)));
  CGAL::insert(arr, ctr_cv(1, 4, 0, 0, 0, -16, CGAL::COUNTERCLOCKWISE, Point(0, -2), Point(4, 0)));
 
  // Insert a full y-major ellipse
  CGAL::insert(arr, ctr_cv(4, 1, 0, 0, 0, -16));
 
  // Insert the full ellipse (x/4)^2 + (y/2)^2 = 1 clockwise rotated by
  // phi = 36.87 degrees (such that sin(phi) = 0.6, cos(phi) = 0.8),
  CGAL::insert(arr, ctr_cv(52, 73, 72, 0, 0, -400));
 
  // Insert the full ellipse (x/4)^2 + (y/2)^2 = 1 counter clockwise rotated by
  // phi = 36.87 degrees (such that sin(phi) = 0.6, cos(phi) = 0.8),
  CGAL::insert(arr, ctr_cv(52, 73, -72, 0, 0, -400));
 
  print_arrangement_size(arr);
 
  CGAL::draw(arr, "ellipses");
 
  return 0;
}
 
#else
 
#include <iostream>
 
int main() {
  std::cout << "Sorry, this example needs GMP and CORE\n";
  return 0;
}
 
#endif