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/*! \file simple_join_intersect.cpp
* Computing the union and the intersection of two simple polygons.
*/
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Boolean_set_operations_2.h>
#include <list>
typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
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 std::list<Polygon_with_holes_2> Pwh_list_2;
#include "print_utils.h"
int main ()
{
// Construct the two input polygons.
Polygon_2 P;
P.push_back (Point_2 (0, 0));
P.push_back (Point_2 (5, 0));
P.push_back (Point_2 (3.5, 1.5));
P.push_back (Point_2 (2.5, 0.5));
P.push_back (Point_2 (1.5, 1.5));
std::cout << "P = "; print_polygon (P);
Polygon_2 Q;
Q.push_back (Point_2 (0, 2));
Q.push_back (Point_2 (1.5, 0.5));
Q.push_back (Point_2 (2.5, 1.5));
Q.push_back (Point_2 (3.5, 0.5));
Q.push_back (Point_2 (5, 2));
std::cout << "Q = "; print_polygon (Q);
// Compute the union of P and Q.
Polygon_with_holes_2 unionR;
if (CGAL::join (P, Q, unionR)) {
std::cout << "The union: ";
print_polygon_with_holes (unionR);
} else
std::cout << "P and Q are disjoint and their union is trivial."
<< std::endl;
std::cout << std::endl;
// Compute the intersection of P and Q.
Pwh_list_2 intR;
Pwh_list_2::const_iterator it;
CGAL::intersection (P, Q, std::back_inserter(intR));
std::cout << "The intersection:" << std::endl;
for (it = intR.begin(); it != intR.end(); ++it) {
std::cout << "--> ";
print_polygon_with_holes (*it);
}
return 0;
}
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