CGAL 6.1 - 2D Triangulations

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Triangulation_2/star_conflict_zone.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Delaunay_triangulation_2.h>
#include <CGAL/draw_triangulation_2.h>
#include <CGAL/spatial_sort.h>
#include <array>
#include <vector>
#include <iostream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_2 Point_2;
typedef CGAL::Delaunay_triangulation_2<K> Dt2;
typedef Dt2::Edge Edge;
typedef Dt2::Face_handle Face_handle;
typedef Dt2::Face_circulator Face_circulator;
typedef Dt2::Vertex_handle Vertex_handle;
int main( )
{
Dt2 dt2;
dt2.insert(Point_2(0,0));
dt2.insert(Point_2(10,0));
dt2.insert(Point_2(0,10));
std::array<Point_2,3> points = { Point_2(2,2), Point_2(1,0), Point_2(2,2) };
CGAL::spatial_sort(points.begin(), points.end());
Face_handle hint;
std::vector<Face_handle> faces;
std::vector<Edge> edges;
assert(dt2.dimension() == 2); // precondition of get_conflicts_and_boundary
for(const Point_2 p : points){
faces.clear(); // faster than variables in the scope
edges.clear();
dt2.get_conflicts_and_boundary(p,
std::back_inserter(faces),
std::back_inserter(edges),
hint);
if(faces.empty()){
std::cout << "point " << p << " already in the triangulation" << std::endl;
}else{
// Do something with the faces before the insertion
Vertex_handle vh = dt2.star_hole(p,
edges.begin(), edges.end(),
faces.begin(), faces.end());
hint = vh->face(); // we could also take any element of faces
// Do something with the faces after the insertion
Face_circulator fc = dt2.incident_faces(vh), done(fc);
do {
fc++;
} while (fc != done);
}
draw(dt2);
}
return 0;
}
CGAL::Delaunay_triangulation_2
The class Delaunay_triangulation_2 is designed to represent the Delaunay triangulation of a set of po...
Definition: Delaunay_triangulation_2.h:80
CGAL::Delaunay_triangulation_2::insert
Vertex_handle insert(const Point &p, Face_handle f=Face_handle())
inserts point p.
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::spatial_sort
void spatial_sort(InputPointIterator begin, InputPointIterator end, const Traits &traits=Default_traits, PolicyTag policy=Default_policy, std::ptrdiff_t threshold_hilbert=default, std::ptrdiff_t threshold_multiscale=default, double ratio=default)