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

CGAL 6.1.2 - 2D Arrangements

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Arrangement_on_surface_2/bgl_primal_adapter.cpp
// Adapting an arrangement to a BGL graph.
#include <vector>
#include <CGAL/config.h>
#include <boost/graph/dijkstra_shortest_paths.hpp>
#include <boost/property_map/vector_property_map.hpp>
#include <CGAL/graph_traits_Arrangement_2.h>
#include <CGAL/Arr_vertex_index_map.h>
#include <CGAL/property_map.h>
#include "arr_exact_construction_segments.h"
#include "Edge_length.h"
using Vertex_index_map = CGAL::Arr_vertex_index_map<Arrangement>;
using My_edge_length = Edge_length<Arrangement>;
int main() {
// Construct an arrangement of seven intersecting line segments.
// We keep a handle for the vertex v0 that corresponds to the point (1,1).
Point p1(1, 1), p2(1, 4), p3(2, 2), p4(3, 7), p5(4, 4), p6(7, 1), p7(9, 3);
Arrangement arr;
Segment s(p1, p6);
Arrangement::Halfedge_handle e = insert_non_intersecting_curve(arr, s);
Arrangement::Vertex_handle v0 = e->source();
insert(arr, Segment(p1, p4)); insert(arr, Segment(p2, p6));
insert(arr, Segment(p3, p7)); insert(arr, Segment(p3, p5));
insert(arr, Segment(p6, p7)); insert(arr, Segment(p4, p7));
// Create a mapping of the arrangement vertices to indices.
Vertex_index_map index_map(arr);
// Create a property map based on std::vector to keep the result distances.
boost::vector_property_map<Number_type, Vertex_index_map>
dist_map(static_cast<unsigned int>(arr.number_of_vertices()), index_map);
// Perform Dijkstra's algorithm from the vertex v0.
My_edge_length edge_length;
boost::dijkstra_shortest_paths(arr, v0, boost::vertex_index_map(index_map).
weight_map(edge_length).distance_map(dist_map).
distance_zero(Number_type(0)).
distance_inf(Number_type(1000)));
// Print the distance of each vertex from v0.
std::cout << "The graph distances of the arrangement vertices from ("
<< v0->point() << ") :\n";
for (auto vit = arr.vertices_begin(); vit != arr.vertices_end(); ++vit)
std::cout << "(" << vit->point() << ") at distance "
<< CGAL::to_double(dist_map[vit]) << std::endl;
return 0;
}
CGAL::Arr_vertex_index_map
Arr_vertex_index_map maintains a mapping of vertex handles of an attached arrangement object to indic...
Definition: Arr_vertex_index_map.h:24
CGAL::to_double
double to_double(const NT &x)