CGAL 6.1.2 - 2D Arrangements: Arrangement_on_surface_2/global_removal.cpp

CGAL 6.1.2 - 2D Arrangements

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Arrangement_on_surface_2/global_removal.cpp
// Using the global removal functions.
#include "arr_exact_construction_segments.h"
#include "arr_print.h"
int main() {
// Create an arrangement of four line segments forming an H-shape:
Arrangement arr;
Segment s1(Point(1, 3), Point(5, 3));
Halfedge_handle e1 = arr.insert_in_face_interior(s1, arr.unbounded_face());
Segment s2(Point(1, 4), Point(5, 4));
Halfedge_handle e2 = arr.insert_in_face_interior (s2, arr.unbounded_face());
insert(arr, Segment(Point(1, 1), Point(1, 6)));
insert(arr, Segment(Point(5, 1), Point(5, 6)));
std::cout << "The initial arrangement:\n";
print_arrangement(arr);
// Remove e1 and its incident vertices using the function remove_edge().
Vertex_handle v1 = e1->source(), v2 = e1->target();
arr.remove_edge(e1);
remove_vertex(arr, v1);
remove_vertex(arr, v2);
// Remove e2 using the free remove_edge() function.
remove_edge(arr, e2);
std::cout << "The final arrangement:\n";
print_arrangement(arr);
return 0;
}