CGAL 6.1 - Fast Intersection and Distance Computation (AABB Tree)

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AABB_tree/AABB_segment_2_example.cpp
#include <iostream>
#include <list>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/AABB_tree.h>
#include <CGAL/AABB_traits_2.h>
#include <CGAL/AABB_segment_primitive_2.h>
#include <CGAL/Polygon_2.h>
typedef CGAL::Simple_cartesian<double> K;
typedef K::FT FT;
typedef K::Segment_2 Segment;
typedef K::Point_2 Point;
typedef std::list<Segment> SegmentRange;
typedef SegmentRange::const_iterator Iterator;
typedef CGAL::AABB_segment_primitive_2<K, Iterator> Primitive;
typedef CGAL::AABB_traits_2<K, Primitive> Traits;
typedef CGAL::AABB_tree<Traits> Tree;
typedef Tree::Point_and_primitive_id Point_and_primitive_id;
int main()
{
Point a(0.0, 0.0);
Point b(2.0, 1.0);
Point c(3.0, 4.0);
Point d(1.0, 6.0);
Point e(-1.0, 3.0);
std::list<Segment> seg;
seg.push_back(Segment(a, b));
seg.push_back(Segment(b, c));
seg.push_back(Segment(c, d));
seg.push_back(Segment(d, e));
seg.push_back(Segment(e, a));
// constructs the AABB tree and the internal search tree for
// efficient distance computations.
Tree tree(seg.begin(), seg.end());
tree.build();
tree.accelerate_distance_queries();
// counts #intersections with a segment query
Segment segment_query(Point(1.0, 0.0), Point(0.0, 7.0));
std::cout << tree.number_of_intersected_primitives(segment_query)
<< " intersections(s) with segment" << std::endl;
// computes the closest point from a point query
Point point_query(1.5, 3.0);
Point closest = tree.closest_point(point_query);
std::cerr << "closest point is: " << closest << std::endl;
Point_and_primitive_id id = tree.closest_point_and_primitive(point_query);
std::cout << id.second->source() << " " << id.second->target() << std::endl;
return EXIT_SUCCESS;
}
CGAL::AABB_segment_primitive_2
Primitive type that uses as identifier an iterator with a 2D segment as value_type.
Definition: AABB_segment_primitive_2.h:84
CGAL::AABB_traits_2
This traits class handles any type of 2D geometric primitives provided that the proper intersection t...
Definition: AABB_traits_2.h:168
CGAL::AABB_tree
Static data structure for efficient intersection and distance computations in 2D and 3D.
Definition: AABB_tree.h:57
Iterator
CGAL::Simple_cartesian