CGAL 5.4 - 2D Polyline Simplification
Polyline_simplification_2/simplify.cpp
#include <boost/config.hpp>
#include <boost/version.hpp>
#include <iostream>
#include <fstream>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/Polygon_with_holes_2.h>
#include <CGAL/Constrained_Delaunay_triangulation_2.h>
#include <CGAL/Constrained_triangulation_plus_2.h>
#include <CGAL/Polyline_simplification_2/simplify.h>
#include <CGAL/Polyline_simplification_2/Squared_distance_cost.h>
#include <CGAL/IO/WKT.h>
typedef CGAL::Polygon_2<K> Polygon_2;
typedef CGAL::Polygon_with_holes_2<K> Polygon_with_holes_2;
typedef PS::Vertex_base_2<K> Vb;
typedef CGAL::Triangulation_data_structure_2<Vb, Fb> TDS;
typedef CT::Point Point;
typedef CT::Constraint_iterator Constraint_iterator;
typedef CT::Vertices_in_constraint_iterator Vertices_in_constraint_iterator;
typedef CT::Points_in_constraint_iterator Points_in_constraint_iterator;
typedef PS::Stop_below_count_ratio_threshold Stop;
typedef PS::Squared_distance_cost Cost;
int main(int argc, char* argv[])
{
std::ifstream ifs( (argc==1)?"data/polygon.wkt":argv[1]);
CT ct;
Polygon_with_holes_2 P;
const Polygon_2& poly = P.outer_boundary();
ct.insert_constraint(poly);
for(Polygon_with_holes_2::Hole_const_iterator it = P.holes_begin(); it != P.holes_end(); ++it){
const Polygon_2& hole = *it;
ct.insert_constraint(hole);
}
}
PS::simplify(ct, Cost(), Stop(0.5));
for(Constraint_iterator cit = ct.constraints_begin();
cit != ct.constraints_end();
++cit) {
std::cout << "simplified polyline" << std::endl;
for(Points_in_constraint_iterator vit =
ct.points_in_constraint_begin(*cit);
vit != ct.points_in_constraint_end(*cit);
++vit)
std::cout << *vit << std::endl;
}
return 0;
}