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

CGAL 4.8 - 2D Straight Skeleton and Polygon Offsetting

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Straight_skeleton_2/Create_skeleton_and_offset_polygons_with_holes_2.cpp
#include<vector>
#include<boost/shared_ptr.hpp>
#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 "print.h"
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> PolygonWithHoles ;
typedef boost::shared_ptr<PolygonWithHoles> PolygonWithHolesPtr ;
typedef std::vector<PolygonWithHolesPtr> PolygonWithHolesPtrVector;
int main()
{
Polygon_2 outer ;
outer.push_back( Point( 0.0, 0.0) ) ;
outer.push_back( Point(10.0, 0.0) ) ;
outer.push_back( Point(10.0, 4.5) ) ;
outer.push_back( Point(12.0, 4.5) ) ;
outer.push_back( Point(12.0, 2.0) ) ;
outer.push_back( Point(16.0, 2.0) ) ;
outer.push_back( Point(16.0, 8.0) ) ;
outer.push_back( Point(12.0, 8.0) ) ;
outer.push_back( Point(12.0, 5.5) ) ;
outer.push_back( Point(10.0, 5.5) ) ;
outer.push_back( Point(10.0,10.0) ) ;
outer.push_back( Point( 0.0,10.0) ) ;
Polygon_2 hole ;
hole.push_back( Point(3.0,3.0) ) ;
hole.push_back( Point(3.0,7.0) ) ;
hole.push_back( Point(7.0,7.0) ) ;
hole.push_back( Point(7.0,3.0) ) ;
PolygonWithHoles poly( outer ) ;
poly.add_hole( hole ) ;
double lOffset = 1 ;
PolygonWithHolesPtrVector offset_poly_with_holes = CGAL::create_interior_skeleton_and_offset_polygons_with_holes_2(lOffset,poly);
print_polygons_with_holes(offset_poly_with_holes);
return 0;
}