Partition_2/optimal_convex_partition_2.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Partition_traits_2.h>
#include <CGAL/Partition_is_valid_traits_2.h>
#include <CGAL/polygon_function_objects.h>
#include <CGAL/partition_2.h>
#include <CGAL/point_generators_2.h>
#include <CGAL/random_polygon_2.h>
#include <cassert>
#include <list>


typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Partition_traits_2<K>                         Traits;
typedef CGAL::Is_convex_2<Traits>                           Is_convex_2;
typedef Traits::Polygon_2                                   Polygon_2;
typedef Traits::Point_2                                     Point_2;
typedef Polygon_2::Vertex_const_iterator                    Vertex_iterator;
typedef std::list<Polygon_2>                                Polygon_list;
typedef CGAL::Partition_is_valid_traits_2<Traits, Is_convex_2>
                                                            Validity_traits;
typedef CGAL::Creator_uniform_2<int, Point_2>               Creator;
typedef CGAL::Random_points_in_square_2<Point_2, Creator>   Point_generator;

void make_polygon(Polygon_2& polygon)
{
   polygon.push_back(Point_2(391, 374));
   polygon.push_back(Point_2(240, 431));
   polygon.push_back(Point_2(252, 340));
   polygon.push_back(Point_2(374, 320));
   polygon.push_back(Point_2(289, 214));
   polygon.push_back(Point_2(134, 390));
   polygon.push_back(Point_2( 68, 186));
   polygon.push_back(Point_2(154, 259));
   polygon.push_back(Point_2(161, 107));
   polygon.push_back(Point_2(435, 108));
   polygon.push_back(Point_2(208, 148));
   polygon.push_back(Point_2(295, 160));
   polygon.push_back(Point_2(421, 212));
   polygon.push_back(Point_2(441, 303));
}

int main()
{
   Polygon_2             polygon;
   Polygon_list          partition_polys;
   Traits                partition_traits;
   Validity_traits       validity_traits;

/*
   CGAL::random_polygon_2(50, std::back_inserter(polygon),
                          Point_generator(100));
*/
   make_polygon(polygon);
   CGAL::optimal_convex_partition_2(polygon.vertices_begin(),
                                    polygon.vertices_end(),
                                    std::back_inserter(partition_polys),
                                    partition_traits);
   assert(CGAL::partition_is_valid_2(polygon.vertices_begin(),
                                     polygon.vertices_end(),
                                     partition_polys.begin(),
                                     partition_polys.end(),
                                     validity_traits));
   return 0;
}