CGAL 6.1.1 - 2D Arrangements

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Arrangement_on_surface_2/predefined_kernel_non_intersecting.cpp
// Constructing an arrangement of non-intersecting line segments using the
// predefined kernel with exact predicates.
#include <list>
#include <fstream>
#include <chrono>
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Arr_non_caching_segment_basic_traits_2.h>
#include <CGAL/Arrangement_2.h>
using Kernel = CGAL::Exact_predicates_inexact_constructions_kernel;
using Number_type = Kernel::FT;
using Traits_2 = CGAL::Arr_non_caching_segment_basic_traits_2<Kernel>;
using Point_2 = Traits_2::Point_2;
using Segment_2 = Traits_2::X_monotone_curve_2;
using Arrangement_2 = CGAL::Arrangement_2<Traits_2>;
int main(int argc, char* argv[]) {
// Get the name of the input file from the command line, or use the default
// Europe.dat file if no command-line parameters are given.
const char* filename = (argc > 1) ? argv[1] : "Europe.dat";
// Open the input file.
std::ifstream in_file(filename);
if (! in_file.is_open()) {
std::cerr << "Failed to open " << filename << " ...\n";
return 1;
}
// Read the segments from the file.
// The input file format should be (all coordinate values are double
// precision floating-point numbers):
// <n> // number of segments.
// <sx_1> <sy_1> <tx_1> <ty_1> // source and target of segment #1.
// <sx_2> <sy_2> <tx_2> <ty_2> // source and target of segment #2.
// : : : :
// <sx_n> <sy_n> <tx_n> <ty_n> // source and target of segment #n.
std::list<Segment_2> segments;
std::size_t n;
in_file >> n;
for (std::size_t i = 0; i < n; ++i) {
double sx, sy, tx, ty;
in_file >> sx >> sy >> tx >> ty;
segments.push_back(Segment_2(Point_2 (Number_type(sx), Number_type(sy)),
Point_2 (Number_type(tx), Number_type(ty))));
}
in_file.close();
// Construct the arrangement by aggregately inserting all segments.
Arrangement_2 arr;
std::cout << "Performing aggregated insertion of " << n << " segments.\n";
auto start = std::chrono::system_clock::now();
insert_non_intersecting_curves (arr, segments.begin(), segments.end());
std::chrono::duration<double> secs = std::chrono::system_clock::now() - start;
// Print the arrangement dimensions.
std::cout << "V = " << arr.number_of_vertices()
<< ", E = " << arr.number_of_edges()
<< ", F = " << arr.number_of_faces() << std::endl;
std::cout << "Construction took " << secs.count() << " seconds.\n";
return 0;
}
CGAL::Arr_non_caching_segment_basic_traits_2
The traits class Arr_non_caching_segment_basic_traits_2 is a model of the AosTraits_2 concept that al...
Definition: Arr_non_caching_segment_basic_traits_2.h:24
CGAL::Arrangement_2
Definition: Arrangement_2.h:57
CGAL::Exact_predicates_inexact_constructions_kernel
Kernel::Point_2
Kernel::Segment_2
Kernel