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

CGAL 4.8 - 2D Regularized Boolean Set-Operations

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Boolean_set_operations_2/dxf_union.cpp
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/General_polygon_set_2.h>
#include <CGAL/Gps_circle_segment_traits_2.h>
#include <CGAL/IO/Dxf_bsop_reader.h>
#include <CGAL/Timer.h>
#include <iostream>
#include <fstream>
#include <vector>
#include <cstdlib>
typedef CGAL::Exact_predicates_exact_constructions_kernel Kernel;
typedef CGAL::Gps_circle_segment_traits_2<Kernel> Traits_2;
typedef Traits_2::Polygon_2 Circ_polygon_2;
typedef Traits_2::Polygon_with_holes_2 Circ_polygon_with_holes_2;
typedef std::vector<Circ_polygon_2> Polygons_vec;
typedef std::vector<Circ_polygon_with_holes_2> Polygons_with_holes_vec;
typedef CGAL::General_polygon_set_2<Traits_2> General_polygon_set_2;
static const int DEFAULT_GROUP_SIZE = 5;
// The command line should be:
// ex_dxf_union [DXF file] [simplify] [group size]
int main (int argc, char* argv[])
{
// Open the input DXF file.
const char* filename = (argc >= 2) ? argv[1] : "test.dxf";
std::ifstream input_file (filename);
if (! input_file.is_open())
{
std::cerr << "Failed to open the " << filename <<std::endl;
return -1;
}
// Read the extra flags.
bool simplify = true;
int group_size = DEFAULT_GROUP_SIZE;
if (argc >= 3)
{
simplify = (std::atoi (argv[2]) != 0);
if (argc >= 4)
group_size = std::atoi (argv[3]);
if (group_size <= 0)
{
std::cerr << "Illegal group size: " << group_size << "." << std::endl;
return (1);
}
}
// Read the circular polygons from the DXF file.
General_polygon_set_2 gps;
Polygons_vec pgns;
Polygons_with_holes_vec pgns_with_holes;
CGAL::Dxf_bsop_reader<Kernel> reader;
CGAL::Timer t_read;
std::cout << "Reading <" << filename << "> ... " << std::flush;
t_read.start();
reader (input_file,
std::back_inserter(pgns),
std::back_inserter(pgns_with_holes),
simplify);
t_read.stop();
std::cout << "Done! (" << t_read.time() << " seconds)." << std::endl;
std::cout << std::distance (pgns.begin(), pgns.end()) << " polygons, "
<< std::distance (pgns_with_holes.begin(), pgns_with_holes.end())
<< " polygons with holes." << std::endl;
input_file.close();
// Compute their union.
CGAL::Timer t_union;
std::cout << "Computing the union ... " << std::flush;
t_union.start();
gps.join (pgns.begin(), pgns.end(),
pgns_with_holes.begin(), pgns_with_holes.end(),
group_size);
t_union.stop();
std::cout << "Done! (" << t_union.time() << " seconds)." << std::endl;
std::cout << "The result:"
<< " |V| = " << gps.arrangement().number_of_vertices()
<< " |E| = " << gps.arrangement().number_of_edges()
<< " |F| = " << gps.arrangement().number_of_faces() << std::endl;
return (0);
}