CGAL 6.2 - 2D Arrangements

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Arrangement_on_surface_2/polycurve_bezier.cpp
// Constructing a arrangement of Bezier polycurves.
#include <CGAL/config.h>
#ifndef CGAL_USE_CORE
#include <iostream>
int main() {
std::cout << "Sorry, this example needs CORE ...\n";
return 0;
}
#else
#include <CGAL/Arr_polycurve_traits_2.h>
#include "arr_Bezier.h"
#include "arr_print.h"
using Polycurve_bezier_traits = CGAL::Arr_polycurve_traits_2<Traits>;
using Point = Polycurve_bezier_traits::Point_2;
using X_mono_polycurve = Polycurve_bezier_traits::X_monotone_curve_2;
using Arrangement_2 = CGAL::Arrangement_2<Polycurve_bezier_traits>;
using Make_x_monotone_result = std::variant<Point, Bezier_x_monotone_curve>;
int main() {
Polycurve_bezier_traits pc_traits;
Traits bezier_traits;
auto ctr_xpolycurve = pc_traits.construct_x_monotone_curve_2_object();
std::vector<Bezier_x_monotone_curve> x_bezier_curves;
// Get the name of the input file from the command line, or use the default
// Bezier.dat file if no command-line parameters are given.
const char* filename = "Bezier_polycurve.dat";
// Open the input file.
std::ifstream in_file(filename);
if (! in_file.is_open()) {
std::cerr << "Failed to open " << filename << std::endl;
return 1;
}
// Read the curves from the input file.
unsigned int n_curves;
std::list<Bezier_x_monotone_curve> x_curves;
Bezier_curve B;
in_file >> n_curves;
for (size_t k = 0; k < n_curves; ++k) {
// Read the current curve (specified by its control points).
in_file >> B;
// convert it into x-monotone bezier curve.
std::vector<Make_x_monotone_result> obj_vector;
bezier_traits.make_x_monotone_2_object()(B, std::back_inserter(obj_vector));
auto* x_seg_p = std::get_if<Bezier_x_monotone_curve>(&obj_vector[0]);
x_curves.push_back(*x_seg_p);
}
X_mono_polycurve polycurve = ctr_xpolycurve(x_curves.begin(), x_curves.end());
Arrangement_2 arr;
insert(arr, polycurve); // construct the arrangement
print_arrangement_size(arr); // print the arrangement size
return 0;
}
#endif
CGAL::Arr_polycurve_traits_2
Note: The SubcurveTraits_2 can comprise of Line_segments, Conic_arcs, Circular_arc,...
Definition: Arr_polycurve_traits_2.h:89
CGAL::Arrangement_2
Definition: Arrangement_2.h:57
CGAL::insert
void insert(Arrangement_2< Traits, Dcel > &arr, const Curve &c, const PointLocation &pl=walk_pl)
The function insert inserts one or more curves or -monotone curves into a given arrangement,...