Point_set_3/point_set_property.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Point_set_3.h>
#include <CGAL/Random.h>
 
#include <fstream>
#include <limits>
 
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;
typedef std::array<unsigned char, 3> Color;
 
typedef CGAL::Point_set_3<Point> Point_set;
typedef Point_set::Property_map<Color> Color_map;
typedef Point_set::Property_map<FT> FT_map;
 
void print_point_set (const Point_set& point_set)
{
  Color_map color = point_set.property_map<Color>("color").value();
  FT_map intensity = point_set.property_map<FT>("intensity").value();
 
  std::cerr << "Content of point set:" << std::endl;
  for (Point_set::const_iterator it = point_set.begin(); it != point_set.end(); ++ it)
  {
    std::cerr << "* Point " << point_set.point(*it) // or point_set[it]
              << " with color [" << static_cast<int>(color[*it][0])
              << " " << static_cast<int>(color[*it][1])
              << " " << static_cast<int>(color[*it][2])
              << "] and intensity " << intensity[*it]
              << std::endl;
  }
}
 
int main (int, char**)
{
  Point_set point_set;
 
  Color black = {{ 0, 0, 0 }};
  bool success = false;
  Color_map color;
 
  boost::tie (color, success) = point_set.add_property_map<Color> ("color", black);
  assert (success);
 
  FT_map intensity;
  boost::tie (intensity, success) = point_set.add_property_map<FT> ("intensity", 0.);
  assert (success);
 
  point_set.reserve (10); // For memory optimization
  for (std::size_t i = 0; i < 10; ++ i)
  {
    Point_set::iterator it = point_set.insert (Point (double(i), double(i), double(i)));
    Color c = {{ static_cast<unsigned char>(CGAL::get_default_random().get_int(0, 255)),
                 static_cast<unsigned char>(CGAL::get_default_random().get_int(0, 255)),
                 static_cast<unsigned char>(CGAL::get_default_random().get_int(0, 255)) }};
    color[*it] = c;
    intensity[*it] = rand() / static_cast<double>(RAND_MAX);
  }
 
  print_point_set (point_set);
 
  // Remove points with intensity less than 0.5
  Point_set::iterator it = point_set.begin();
  while (it != point_set.end())
  {
    if (intensity[*it] < 0.5)
      point_set.remove(it);
    else
      ++ it;
  }
 
  print_point_set (point_set); // point set is filtered
 
  return 0;
}