CGAL 6.1.1 - Geometric Object Generators

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Generator/random_points_on_triangle_mesh_2.cpp
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Constrained_Delaunay_triangulation_2.h>
#include <CGAL/Delaunay_mesh_face_base_2.h>
#include <CGAL/Delaunay_mesh_size_criteria_2.h>
#include <CGAL/Delaunay_mesher_2.h>
#include <CGAL/Triangulation_face_base_with_info_2.h>
#include <CGAL/Polygon_2.h>
#include <CGAL/point_generators_2.h>
#include <iostream>
#include <fstream>
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Triangulation_vertex_base_2<K> Vb;
typedef CGAL::Delaunay_mesh_face_base_2<K> Fb;
typedef CGAL::Triangulation_data_structure_2<Vb, Fb> Tds;
typedef CGAL::Constrained_Delaunay_triangulation_2<K, Tds> CDT;
typedef CDT::Point Point;
typedef CGAL::Polygon_2<K> Polygon_2;
typedef CGAL::Delaunay_mesh_size_criteria_2<CDT> Mesh_2_criteria;
using namespace CGAL;
int main()
{
// Generated points are in that vector
std::vector<Point> points;
//Construct two non-intersecting nested polygons
::Polygon_2 polygon1;
polygon1.push_back(Point(0,0));
polygon1.push_back(Point(2,0));
polygon1.push_back(Point(2,2));
polygon1.push_back(Point(0,2));
::Polygon_2 polygon2;
polygon2.push_back(Point(4.0,-2.0));
polygon2.push_back(Point(4.0,2.0));
polygon2.push_back(Point(6.0,0.0));
//Insert the polygons into a constrained triangulation
CDT cdt;
cdt.insert_constraint(polygon1.vertices_begin(), polygon1.vertices_end(), true);
cdt.insert_constraint(polygon2.vertices_begin(), polygon2.vertices_end(), true);
// Refine the triangulation (and mark the faces as inside/outside)
Mesh_2_criteria criteria(0.125, 0.5);
CGAL::refine_Delaunay_mesh_2(cdt, CGAL::parameters::criteria(criteria));
// Create the generator, input is the Triangulation_2 cdt
Random_points_in_triangle_mesh_2<Point, CDT> g(cdt);
// Get 100 random points in cdt
std::copy_n(g, 100, std::back_inserter(points));
// Check that we have really created 100 points.
assert(points.size() == 100);
// print the first point that was generated
std::cout << points[0] << std::endl;
return 0;
}
CGAL::Constrained_Delaunay_triangulation_2
CGAL::Delaunay_mesh_face_base_2
CGAL::Delaunay_mesh_size_criteria_2
CGAL::Exact_predicates_inexact_constructions_kernel
CGAL::Random_points_in_triangle_mesh_2
The class Random_points_in_triangle_mesh_2 is an input iterator creating points uniformly distributed...
Definition: point_generators_2.h:362
CGAL::Triangulation_vertex_base_2
CGAL::refine_Delaunay_mesh_2
void refine_Delaunay_mesh_2(CDT &t, const NamedParameters &np)
CGAL