CGAL 5.6.1 - Geometric Object Generators
Generator/random_polygon.cpp
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/point_generators_2.h>
#include <CGAL/random_polygon_2.h>
#include <CGAL/Random.h>
#include <CGAL/algorithm.h>
#ifdef CGAL_USE_GMP
#include <CGAL/Gmpz.h>
typedef CGAL::Gmpz RT;
#else
// NOTE: the choice of double here for a number type may cause problems
// for degenerate point sets
#include <CGAL/double.h>
typedef double RT;
#endif
#include <fstream>
#include <list>
typedef K::Point_2 Point_2;
typedef std::list<Point_2> Container;
typedef CGAL::Polygon_2<K, Container> Polygon_2;
const int MAX_POLY_SIZE = 100;
int main()
{
Polygon_2 polygon;
std::list<Point_2> point_set;
std::cerr << "Seed = " << rand.get_seed() << std::endl;
int size = rand.get_int(4, MAX_POLY_SIZE);
// copy size points from the generator, eliminating duplicates, so the
// polygon will have <= size vertices
std::back_inserter(point_set));
std::ostream_iterator< Point_2 > out( std::cout, " " );
std::cout << "From the following " << point_set.size() << " points "
<< std::endl;
std::copy(point_set.begin(), point_set.end(), out);
std::cout << std::endl;
CGAL::random_polygon_2(point_set.size(), std::back_inserter(polygon),
point_set.begin());
std::cout << "The following simple polygon was made: " << std::endl;
std::cout << polygon << std::endl;
return 0;
}