Periodic_2_triangulation_2/p2t2_large_point_set.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 
#include <CGAL/Periodic_2_Delaunay_triangulation_traits_2.h>
#include <CGAL/Periodic_2_Delaunay_triangulation_2.h>
 
#include <CGAL/Random.h>
#include <CGAL/point_generators_2.h>
#include <CGAL/Timer.h>
 
#include <iostream>
#include <vector>
 
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Periodic_2_Delaunay_triangulation_traits_2<K> GT;
typedef CGAL::Periodic_2_Delaunay_triangulation_2<GT> PDT;
 
typedef PDT::Point          Point;
 
int main()
{
  CGAL::Timer t;
  typedef CGAL::Creator_uniform_2<double, Point> Creator;
  CGAL::Random random(7);
  CGAL::Random_points_in_square_2<Point, Creator> in_square(.5, random);
 
  int n = 10000;
  std::vector<Point> pts;
 
  PDT PT1, PT2, PT3;
 
  // Generating n random points
  for (int i = 0 ; i < n ; i++)
  {
    Point p = *in_square;
    in_square++;
    pts.push_back(Point(p.x() + .5, p.y() + .5));
  }
 
  // Standard insertion
  t.start();
  for (int i = 0 ; i < n ; i++)
    PT1.insert(pts[i]);
 
  t.stop();
  std::cout << "  Time: " << t.time() << " sec. (Standard insertion)" << std::endl;
  t.reset();
 
  // Iterator range insertion using spatial sorting but no dummy points
  t.start();
  PT2.insert(pts.begin(), pts.end()); // third parameter defaults to false
  t.stop();
  std::cout << "  Time: " << t.time() << " sec. (with spatial sorting)" << std::endl;
  t.reset();
 
  // Iterator range insertion using spatial sorting and dummy point heuristic
  t.start();
  PT3.insert(pts.begin(), pts.end(), true);
  t.stop();
  std::cout << "  Time: " << t.time() << " sec. (Dummy point heuristic)" << std::endl;
 
  return 0;
}