#include <vector>

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/create_offset_polygons_2.h>
#include <CGAL/Timer.h>

typedef CGAL::Exact_predicates_inexact_constructions_kernel K ;

typedef K::Point_2                   Point ;
typedef CGAL::Polygon_2<K>           Polygon_2 ;
typedef CGAL::Straight_skeleton_2<K> Ss ;

typedef std::shared_ptr<Polygon_2> PolygonPtr ;
typedef std::shared_ptr<Ss> SsPtr ;

typedef std::vector<PolygonPtr> PolygonPtrVector ;

int main()
{
  Polygon_2 poly ;

  poly.push_back( Point(-1,-1) ) ;
  poly.push_back( Point(0,-12) ) ;
  poly.push_back( Point(1,-1) ) ;
  poly.push_back( Point(12,0) ) ;
  poly.push_back( Point(1,1) ) ;
  poly.push_back( Point(0,12) ) ;
  poly.push_back( Point(-1,1) ) ;
  poly.push_back( Point(-12,0) ) ;

  SsPtr ss = CGAL::create_interior_straight_skeleton_2(poly);

  double offset = 1 ;

  {
    CGAL::Timer time; time.start();
    PolygonPtrVector outer_polygons =
    CGAL::create_exterior_skeleton_and_offset_polygons_2(offset, poly);
    time.stop();
    std:: cout << outer_polygons.size() << " built in " << time.time() << "\n";
  }

  {
    CGAL::Timer time; time.start();
    PolygonPtrVector outer_polygons =
    CGAL::create_offset_polygons_2<Polygon_2>(offset,
    *CGAL::create_exterior_straight_skeleton_2( offset, poly));
    time.stop();
    std:: cout << outer_polygons.size() << " built in " << time.time() << "\n";
  }

  return 0;
}


