CGAL 4.7 - Geometric Object Generators: Generator/random_polygon.cpp

\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.7 - 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;
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;
}