CGAL 5.6.3 - 2D Arrangements

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Arrangement_on_surface_2/circles.cpp
// Constructing an arrangement of circles using the circle-segment traits.
#include <CGAL/draw_arrangement_2.h>
#include "arr_circular.h"
int main() {
Arrangement arr;
// Create a circle centered at the origin with radius 5 (C1).
insert(arr, Curve(Circle(Rational_point(0, 0), Number_type(25))));
// Create a circle centered at (7,7) with radius 5 (C2).
insert(arr, Curve(Circle(Rational_point(7, 7), Number_type(25))));
// Create a circle centered at (4,-0.5) with radius 3.5 (= 7/2) (C3).
Rational_point c3(4, Number_type(-1) / Number_type(2));
insert(arr, Curve(Circle(c3, Number_type(49) / Number_type(4))));
// Locate the vertex with maximal degree.
auto vit = arr.vertices_begin();
Arrangement::Vertex_const_handle v_max = vit;
for (++vit; vit != arr.vertices_end(); ++vit)
if (vit->degree() > v_max->degree()) v_max = vit;
// Locate the vertex with maximum degree.
std::cout << "The vertex with maximal degree in the arrangement is: "
<< "v_max = (" << v_max->point() << ") "
<< "with degree " << v_max->degree() << "." << std::endl;
CGAL::draw(arr);
return 0;
}
CGAL::draw
void draw(const PS &aps)