CGAL 6.2 - 2D Straight Skeleton and Polygon Offsetting

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Straight_skeleton_2/Show_straight_skeleton.cpp
#include <vector>
#include <iterator>
#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>
#include <cassert>
#include <CGAL/draw_straight_skeleton_2.h>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/create_straight_skeleton_from_polygon_with_holes_2.h>
#include "dump_to_eps.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> Polygon_with_holes ;
typedef CGAL::Straight_skeleton_2<K> Straight_skeleton ;
typedef std::shared_ptr<Straight_skeleton> Straight_skeleton_ptr ;
int main( int argc, char* argv[] )
{
Polygon_with_holes input ;
if ( argc > 1 )
{
std::string name = argv[1] ;
std::cout << "Input file: " << name << std::endl ;
std::ifstream is(name.c_str()) ;
if ( is )
{
is >> input ;
assert(input.outer_boundary().is_counterclockwise_oriented());
for(Polygon_with_holes::Hole_const_iterator it = input.holes_begin();
it != input.holes_end();
++it){
assert(it->is_clockwise_oriented());
}
//check the validity of the input and fix orientation
if (!input.outer_boundary().is_simple())
{
std::cerr << "ERROR: outer boundary is not simple.";
return 1;
}
int k=0;
for (Polygon_with_holes::Hole_iterator it = input.holes_begin();
it!=input.holes_end(); ++it, ++k)
{
if (!it->is_simple())
{
std::cerr << "ERROR: hole "<< k << " is not simple.\n";
return 1;
}
}
Straight_skeleton_ptr ss = CGAL::create_interior_straight_skeleton_2(input);
if ( ss )
{
std::string eps_name ;
if ( argc > 2 )
eps_name = argv[2];
else eps_name = name + ".skeleton.eps" ;
std::ofstream eps(eps_name.c_str()) ;
if ( eps )
{
std::cerr << "Result: " << eps_name << std::endl ;
dump_to_eps(input,*ss,eps);
}
else
{
std::cerr << "Could not open result file: " << eps_name << std::endl ;
}
}
else
{
std::cerr << "ERROR creating interior straight skeleton" << std::endl ;
}
}
else
{
std::cerr << "Could not open input file: " << name << std::endl ;
}
}
else
{
std::cerr << "Computes the straight skeleton in the interior of a polygon with holes and draws it in an EPS file." << std::endl
<< std::endl
<< "Usage: show_straight_skeleton <input_file> [output_eps_file]" << std::endl
<< std::endl
<< " input_file Text file describing the input polygon with holes." << std::endl
<< " (See input_file_format.txt for details" << std::endl
<< " or use input_file_example.txt)" << std::endl
<< " output_file [default='input_file.skeleton.eps']" << std::endl ;
}
return 0;
}
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Polygon_2
CGAL::Polygon_with_holes_2
CGAL::Straight_skeleton_2
The class Straight_skeleton_2 provides a model for the StraightSkeleton_2 concept which is the class ...
Definition: Straight_skeleton_2.h:178
CGAL::create_interior_straight_skeleton_2
std::shared_ptr< Straight_skeleton_2< SsK > > create_interior_straight_skeleton_2(PointIterator outer_contour_vertices_begin, PointIterator outer_contour_vertices_end, HoleIterator holes_begin, HoleIterator holes_end, SsK k=CGAL::Exact_predicates_inexact_constructions_kernel())
creates a straight skeleton in the interior of the 2D polygon with holes.