Straight_skeleton_2/Create_saop_from_polygon_with_holes_2.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/create_offset_polygons_from_polygon_with_holes_2.h>
#include <CGAL/Straight_skeleton_2/IO/print.h>
 
#include <memory>
 
#include <cassert>
#include <vector>
 
typedef CGAL::Exact_predicates_inexact_constructions_kernel K ;
 
typedef K::Point_2                    Point ;
typedef CGAL::Polygon_2<K>            Polygon_2 ;
typedef CGAL::Polygon_with_holes_2<K> Polygon_with_holes ;
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 outer ;
  outer.push_back( Point(-1,-1) ) ;
  outer.push_back( Point(0,-12) ) ;
  outer.push_back( Point(1,-1) ) ;
  outer.push_back( Point(12,0) ) ;
  outer.push_back( Point(1,1) ) ;
  outer.push_back( Point(0,12) ) ;
  outer.push_back( Point(-1,1) ) ;
  outer.push_back( Point(-12,0) ) ;
 
  Polygon_2 hole ;
  hole.push_back( Point(-1,0) ) ;
  hole.push_back( Point(0,1 ) ) ;
  hole.push_back( Point(1,0 ) ) ;
  hole.push_back( Point(0,-1) ) ;
 
  assert(outer.is_counterclockwise_oriented());
  assert(hole.is_clockwise_oriented());
 
  Polygon_with_holes poly( outer ) ;
  poly.add_hole( hole ) ;
 
  double lOffset = 0.2 ;
  PolygonPtrVector offset_polygons = CGAL::create_interior_skeleton_and_offset_polygons_2(lOffset,poly);
 
  CGAL::Straight_skeletons_2::IO::print_polygons(offset_polygons);
 
  return EXIT_SUCCESS;
}