CGAL 6.1 - Geometric Object Generators

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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 CGAL::Simple_cartesian<RT> K;
typedef K::Point_2 Point_2;
typedef std::list<Point_2> Container;
typedef CGAL::Polygon_2<K, Container> Polygon_2;
typedef CGAL::Creator_uniform_2<int, Point_2> Creator;
typedef CGAL::Random_points_in_square_2<Point_2, Creator> Point_generator;
const double RADIUS = 100;
const int MAX_POLY_SIZE = 100;
int main()
{
Polygon_2 polygon;
std::list<Point_2> point_set;
CGAL::Random rand;
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
CGAL::copy_n_unique(Point_generator(RADIUS), size,
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;
}
CGAL::Creator_uniform_2
CGAL::Random_points_in_square_2
The class Random_points_in_square_2 is an input iterator creating points uniformly distributed in a h...
Definition: point_generators_2.h:218
CGAL::Random
The class Random is a random numbers generator.
Definition: Random.h:33
CGAL::Random::get_seed
unsigned int get_seed() const
returns the seed used for initialization.
CGAL::Random::get_int
int get_int(int lower, int upper)
returns a random int from the interval [lower,upper).
Container
CGAL::random_polygon_2
OutputIterator random_polygon_2(std::size_t n, OutputIterator result, const PointGenerator &pg, Traits t=Default_traits)
computes a random simple polygon by writing its vertices (oriented counterclockwise) to result.
CGAL::Simple_cartesian