CGAL 4.7 - 2D Regularized Boolean Set-Operations
Boolean_set_operations_2/sequence.cpp
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/Polygon_set_2.h>
#include <list>
typedef Kernel::Point_2 Point_2;
typedef CGAL::Polygon_2<Kernel> Polygon_2;
typedef CGAL::Polygon_with_holes_2<Kernel> Polygon_with_holes_2;
typedef CGAL::Polygon_set_2<Kernel> Polygon_set_2;
#include "print_utils.h"
int main ()
{
// Construct the two initial polygons and the clipping rectangle.
Polygon_2 P;
P.push_back (Point_2 (0, 1));
P.push_back (Point_2 (2, 0));
P.push_back (Point_2 (1, 1));
P.push_back (Point_2 (2, 2));
Polygon_2 Q;
Q.push_back (Point_2 (3, 1));
Q.push_back (Point_2 (1, 2));
Q.push_back (Point_2 (2, 1));
Q.push_back (Point_2 (1, 0));
Polygon_2 rect;
rect.push_back (Point_2 (0, 0));
rect.push_back (Point_2 (3, 0));
rect.push_back (Point_2 (3, 2));
rect.push_back (Point_2 (0, 2));
// Perform a sequence of operations.
Polygon_set_2 S;
S.insert (P);
S.join (Q); // Compute the union of P and Q.
S.complement(); // Compute the complement.
S.intersection (rect); // Intersect with the clipping rectangle.
// Print the result.
std::list<Polygon_with_holes_2> res;
std::list<Polygon_with_holes_2>::const_iterator it;
std::cout << "The result contains " << S.number_of_polygons_with_holes()
<< " components:" << std::endl;
S.polygons_with_holes (std::back_inserter (res));
for (it = res.begin(); it != res.end(); ++it) {
std::cout << "--> ";
print_polygon_with_holes (*it);
}
return 0;
}