CGAL 5.5.2 - 2D Straight Skeleton and Polygon Offsetting
Straight_skeleton_2/Create_skeleton_and_offset_polygons_2.cpp
#include<CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/create_offset_polygons_2.h>
#include "print.h"
#include <boost/shared_ptr.hpp>
#include <cassert>
#include <vector>
typedef K::FT FT ;
typedef K::Point_2 Point ;
typedef CGAL::Polygon_2<K> Polygon_2 ;
typedef boost::shared_ptr<Polygon_2> PolygonPtr ;
typedef boost::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) ) ;
assert(poly.is_counterclockwise_oriented());
FT lOffset = 1 ;
PolygonPtrVector inner_offset_polygons = CGAL::create_interior_skeleton_and_offset_polygons_2(lOffset,poly);
PolygonPtrVector outer_offset_polygons = CGAL::create_exterior_skeleton_and_offset_polygons_2(lOffset,poly);
print_polygons(inner_offset_polygons);
print_polygons(outer_offset_polygons);
return 0;
}