C++ cgal::Timer类代码示例

int main( int argc, char **argv) {
    if ( argc != 3) {
        cerr << "Usage: " << argv[0] << " <infile1> <infile2>" << endl;
        cerr << "       Minkowsky sum of two 3d polyhedra in OFF format." 
             << endl;
        cerr << "       Output in OFF to stdout." << endl;
        exit(1);
    }
    Polyhedron P1;
    Polyhedron P2;
    read( argv[1], P1);
    read( argv[2], P2);

    CGAL::Timer t;
    t.start();

    vector<Point> points;
    Add_points add;
    fold( P1.vertices_begin(), P1.vertices_end(),
          P2.vertices_begin(), P2.vertices_end(),
          back_inserter( points),
          add);
    Polyhedron P3;
    convex_hull_3( points.begin(), points.end(), P3);

    t.stop();
    std::cout << "Runtime Minkowski Sum: " << t.time() << std::endl;

    //    cout << P3;
    return 0;
}

void Scene::bench_distance(Facet_tree& tree,
                           const int function,
                           const double duration)
{

    // generates 100K random point queries
    srand(0);
    unsigned int nb_queries = 100000;
    std::vector<Point> queries;
    for(unsigned int i=0;i<nb_queries;i++)
        queries.push_back(random_point(tree.bbox()));

    CGAL::Timer timer;
    timer.start();
    unsigned int nb = 0;
    while(timer.time() < duration)
    {
        const Point& query = queries[nb%nb_queries];
        switch(function)
        {
        case SQ_DISTANCE:
            tree.squared_distance(query);
            break;
        case CLOSEST_POINT:
            tree.closest_point(query);
            break;
        case CLOSEST_POINT_AND_PRIMITIVE_ID:
            tree.closest_point_and_primitive(query);
        }
        nb++;
    }

    double speed = (double)nb / (double)timer.time();
    std::cout << speed << " queries/s" << std::endl;
}

//create a plane passing the center, with the average of some normals as normal
//the plane created is stored in m_basePlane
//用：CGAL::Plane_3<Kernel>我们这里默认了所得到的边界点是有顺序的！！！
void SgpProp::createPlane(Vertex_handle &center, Polyhedron* mesh)
{
	std::cout << "  SgpProp::createPlane() begin!" <<std::endl;
	CGAL::Timer timer;
	timer.start();	

	std::list<Vertex_handle>& main_border = mesh->main_border();
	if (main_border.empty())
	{
		main_border = mesh->extract_longest_border();
	}

	std::list<Vector_3 > spokes;//a circular linked list
	for (std::list<Vertex_handle>::iterator it=main_border.begin(); it!=main_border.end(); ++it)
	{
		Vertex_handle vh = *it;
		spokes.push_back(vh->point() - center->point());
	}
	spokes.push_back(*(spokes.begin()) );

	std::list<Vector_3 >::iterator bVector = spokes.begin();
	std::list<Vector_3 >::iterator nVector = bVector;
	Vector_3 sum_norm(0,0,0);
	for(++nVector; nVector != spokes.end(); ++nVector,++bVector)
	{
		sum_norm = sum_norm + CGAL::cross_product(*bVector,*nVector);
	} 

	m_basePlaneNormal = sum_norm/(spokes.size()+1);
	
	std::cout << "....Time: " << timer.time() << " seconds." << std::endl<<std::endl;
}

template < class Traits > double test_sort(unsigned int degree, unsigned int n)
{
    typedef CGAL::Kinetic::Sort < Traits > Sort;
    Traits tr(0, 10000);
    Sort sort(tr);
    CGAL::Random r;
    for (unsigned int i = 0; i < n; ++i) {
        std::vector < double >cf;
        for (unsigned int j = 0; j < degree + 1; ++j) {
            cf.push_back(r.get_double());
        }
        typename Traits::Kinetic_kernel::Motion_function fn(cf.begin(),
            cf.end());
        typename Traits::Kinetic_kernel::Point_1 pt(fn);
        tr.active_points_1_table_handle()->insert(pt);
    }
    CGAL::Timer timer;
    timer.start();
    int ne = 0;
    while (tr.simulator_handle()->next_event_time() !=
    tr.simulator_handle()->end_time()) {
        tr.simulator_handle()->set_current_event_number(tr.
            simulator_handle()->
            current_event_number()
            + 1);
        ++ne;
        if (ne == 1000)
            break;
    }
    timer.stop();
    return timer.time() / static_cast < double >(ne);
}

// just reusing the tests from the T3 package to check whether the
// periodic vertices and cells fulfill the requirements.
int main(int, char**)
{
  CGAL::Timer timer;
  timer.start();
  _test_cls_periodic_3_tds_3(Tds());
  std::cerr << timer.time() << " sec." << std::endl;
  return 0;
}

int main (int argc, char *argv[]) {
    // Cube
    std::list<Plane> planes;
    planes.push_back(Plane(1, 0, 0, -1));
    planes.push_back(Plane(-1, 0, 0, -1));
    planes.push_back(Plane(0, 1, 0, -1));
    planes.push_back(Plane(0, -1, 0, -1));
    planes.push_back(Plane(0, 0, 1, -1));
    planes.push_back(Plane(0, 0, -1, -1));

    std::vector<Point> points;
    int N, steps;
    // Number of points
    if (argc > 1) {
        N = atoi(argv[1]);
    } else {
        N = 50;
    }

    // Number of steps
    if (argc > 2) {
        steps = atoi(argv[2]);
    } else {
        steps = 10;
    }

    CGAL::Random_points_in_sphere_3<Point> g;
    for (int i = 0; i < N; i++) {
        Point p = *g++;
        points.push_back(p);
    }

    std::ofstream bos("before_lloyd.xyz");
    std::copy(points.begin(), points.end(),
              std::ostream_iterator<Point>(bos, "\n"));

    // Apply Lloyd algorithm: will generate points
    // uniformly sampled inside a cube.
    for (int i = 0; i < steps; i++) {
        std::cout << "iteration " << i + 1 << std::endl;

        CGAL::Timer timer;
        timer.start();
        lloyd_algorithm(planes.begin(),
                        planes.end(),
                        points);
        timer.stop();

        std::cout << "Execution time : " << timer.time() << "s\n";
    }

    std::ofstream aos("after_lloyd.xyz");
    std::copy(points.begin(), points.end(),
              std::ostream_iterator<Point>(aos, "\n"));

    return 0;
}

int main (int argc, char *argv[])
{
  // Get the name of the input file from the command line, or use the default
  // fan_grids.dat file if no command-line parameters are given.
  const char * filename = (argc > 1) ? argv[1] : "fan_grids.dat";

  // Open the input file.
  std::ifstream     in_file (filename);

  if (! in_file.is_open()) {
    std::cerr << "Failed to open " << filename << " ..." << std::endl;
    return (1);
  }

  // Read the segments from the file.
  // The input file format should be (all coordinate values are integers):
  // <n>                                 // number of segments.
  // <sx_1> <sy_1>  <tx_1> <ty_1>        // source and target of segment #1.
  // <sx_2> <sy_2>  <tx_2> <ty_2>        // source and target of segment #2.
  //   :      :       :      :
  // <sx_n> <sy_n>  <tx_n> <ty_n>        // source and target of segment #n.
  
  std::list<Segment_2>  segments;

  unsigned int n;
  in_file >> n;
  unsigned int i;
  for (i = 0; i < n; ++i) {
    int sx, sy, tx, ty;
    in_file >> sx >> sy >> tx >> ty;
    segments.push_back (Segment_2 (Point_2 (Number_type(sx), Number_type(sy)),
                                   Point_2 (Number_type(tx), Number_type(ty))));
  }
  in_file.close();

  // Construct the arrangement by aggregately inserting all segments.
  Arrangement_2                  arr;
  CGAL::Timer                    timer;

  std::cout << "Performing aggregated insertion of " 
            << n << " segments." << std::endl;

  timer.start();
  insert (arr, segments.begin(), segments.end());
  timer.stop();

  // Print the arrangement dimensions.
  std::cout << "V = " << arr.number_of_vertices()
	    << ",  E = " << arr.number_of_edges() 
	    << ",  F = " << arr.number_of_faces() << std::endl;

  std::cout << "Construction took " << timer.time() 
	    << " seconds." << std::endl;
  
  return 0;
}

int main()
{
  CGAL::Timer timer;
  timer.start();
  _test_cls_alpha_shape_3<Alpha_shape_3>();
  _test_cls_alpha_shape_3_exact<EAlpha_shape_3>();

  std::cerr << timer.time() << " sec." << std::endl;
  return 0;
}

void Scene::generate_points_in(const unsigned int nb_points,
                               const double min,
                               const double max)
{
    if(m_pPolyhedron == NULL)
    {
        std::cout << "Load polyhedron first." << std::endl;
        return;
    }

    typedef CGAL::AABB_face_graph_triangle_primitive<Polyhedron> Primitive;
    typedef CGAL::AABB_traits<Kernel, Primitive> Traits;
    typedef CGAL::AABB_tree<Traits> Tree;

    std::cout << "Construct AABB tree...";
    Tree tree(faces(*m_pPolyhedron).first, faces(*m_pPolyhedron).second, *m_pPolyhedron);
    std::cout << "done." << std::endl;

    CGAL::Timer timer;
    timer.start();
    std::cout << "Generate " << nb_points << " points in interval ["
              << min << ";" << max << "]";

    unsigned int nb_trials = 0;
    Vector vec = random_vector();
    while(m_points.size() < nb_points)
    {
        Point p = random_point(tree.bbox());

        // measure distance
        FT signed_distance = std::sqrt(tree.squared_distance(p));

        // measure sign
        Ray ray(p,vec);
        int nb_intersections = (int)tree.number_of_intersected_primitives(ray);
        if(nb_intersections % 2 != 0)
            signed_distance *= -1.0;

        if(signed_distance >= min &&
                signed_distance <= max)
        {
            m_points.push_back(p);
            if(m_points.size()%(nb_points/10) == 0)
                std::cout << "."; // ASCII progress bar
        }
        nb_trials++;
    }
    double speed = (double)nb_trials / timer.time();
    std::cout << "done (" << nb_trials << " trials, "
              << timer.time() << " s, "
              << speed << " queries/s)" << std::endl;
    changed();
}

void Scene::generate_edge_points(const unsigned int nb_points)
{
    if(m_pPolyhedron == NULL)
    {
        std::cout << "Load polyhedron first." << std::endl;
        return;
    }

    typedef CGAL::AABB_halfedge_graph_segment_primitive<Polyhedron> Primitive;
    typedef CGAL::AABB_traits<Kernel, Primitive> Traits;
    typedef CGAL::AABB_tree<Traits> Tree;
    typedef Tree::Object_and_primitive_id Object_and_primitive_id;

    std::cout << "Construct AABB tree...";
    Tree tree( CGAL::edges(*m_pPolyhedron).first,
               CGAL::edges(*m_pPolyhedron).second,
               *m_pPolyhedron);
    std::cout << "done." << std::endl;

    CGAL::Timer timer;
    timer.start();
    std::cout << "Generate edge points: ";

    unsigned int nb = 0;
    unsigned int nb_planes = 0;
    while(nb < nb_points)
    {
        Plane plane = random_plane(tree.bbox());

        std::list<Object_and_primitive_id> intersections;
        tree.all_intersections(plane,std::back_inserter(intersections));
        nb_planes++;

        std::list<Object_and_primitive_id>::iterator it;
        for(it = intersections.begin();
            it != intersections.end();
            it++)
        {
            Object_and_primitive_id op = *it;
            CGAL::Object object = op.first;
            Point point;
            if(CGAL::assign(point,object))
            {
                m_points.push_back(point);
                nb++;
            }
        }
    }
    std::cout << nb_planes << " plane queries, " << timer.time() << " s." << std::endl;
    changed();
}

void test_speed_for_query(const Tree& tree,
                          const Query_type query_type,
                          const char *query_name,
                          const double duration)
{
    typedef typename K::Ray_3 Ray;
    typedef typename K::Line_3 Line;
    typedef typename K::Point_3 Point;
    typedef typename K::Vector_3 Vector;
    typedef typename K::Segment_3 Segment;

    CGAL::Timer timer;
    unsigned int nb = 0;
    timer.start();
    while(timer.time() < duration)
    {
        switch(query_type)
        {
            case RAY_QUERY:
                {
                    Point source = random_point_in<K>(tree.bbox());
                    Vector vec = random_vector<K>();
                    Ray ray(source, vec);
                    tree.do_intersect(ray);
                    break;
                }
            case SEGMENT_QUERY:
                {
                    Point a = random_point_in<K>(tree.bbox());
                    Point b = random_point_in<K>(tree.bbox());
                    tree.do_intersect(Segment(a,b));
                    break;
                }
                break;
            case LINE_QUERY:
                {
                    Point a = random_point_in<K>(tree.bbox());
                    Point b = random_point_in<K>(tree.bbox());
                    tree.do_intersect(Line(a,b));
                    break;
                }
        }
        nb++;
    }
    unsigned int speed = (unsigned int)(nb / timer.time());
    std::cout.precision(10);
    std::cout.width(15);
    std::cout << speed << " intersections/s with " << query_name << std::endl;
    timer.stop();
}

void build_skeleton(const char* fname)
{
  typedef typename Kernel::Point_2                                         Point_2;
  typedef CGAL::Polygon_2<Kernel>                                 Polygon_2;
  typedef CGAL::Straight_skeleton_builder_traits_2<Kernel>        SsBuilderTraits;
  typedef CGAL::Straight_skeleton_2<Kernel>                       Ss;
  typedef CGAL::Straight_skeleton_builder_2<SsBuilderTraits,Ss>   SsBuilder;
  
  Polygon_2 pgn;
  
  std::ifstream input(fname);
  
  FT x,y;
  while(input)
  {
    input >> x;
    if (!input) break;
    input >> y;
    if (!input) break;
    pgn.push_back( Point_2( typename Kernel::FT(x), typename Kernel::FT(y) ) );
  }
  input.close();
  
  std::cout << "Polygon has " << pgn.size() <<  " points\n";
  
  if(!pgn.is_counterclockwise_oriented()) {
      std::cerr << "Polygon is not CCW Oriented" << std::endl;
  }
  if(!pgn.is_simple()) {
      std::cerr << "Polygon is not simple" << std::endl;
  }  

  CGAL::Timer time;
  time.start();
  SsBuilder ssb;
  ssb.enter_contour(pgn.vertices_begin(), pgn.vertices_end());
  boost::shared_ptr<Ss> straight_ske = ssb.construct_skeleton();
  time.stop();
  
  std::cout << "Time spent to build skeleton " << time.time() << "\n";
  
  if(!straight_ske->is_valid()) {
      std::cerr << "Straight skeleton is not valid" << std::endl;
  }

  std::cerr.precision(60);
  print_straight_skeleton(*straight_ske);
  
}

void Scene::generate_boundary_segments(const unsigned int nb_slices)
{
    if(m_pPolyhedron == NULL)
    {
        std::cout << "Load polyhedron first." << std::endl;
        return;
    }

    typedef CGAL::AABB_face_graph_triangle_primitive<Polyhedron> Primitive;
    typedef CGAL::AABB_traits<Kernel, Primitive> Traits;
    typedef CGAL::AABB_tree<Traits> Tree;
    typedef Tree::Object_and_primitive_id Object_and_primitive_id;

    std::cout << "Construct AABB tree...";
    Tree tree(faces(*m_pPolyhedron).first,faces(*m_pPolyhedron).second,*m_pPolyhedron);
    std::cout << "done." << std::endl;

    CGAL::Timer timer;
    timer.start();
    std::cout << "Generate boundary segments from " << nb_slices << " slices: ";

    Vector normal((FT)0.0,(FT)0.0,(FT)1.0);
    unsigned int i;

    const double dz = m_bbox.zmax() - m_bbox.zmin();
    for(i=0;i<nb_slices;i++)
    {
        FT z = m_bbox.zmin() + (FT)i / (FT)nb_slices * dz;
        Point p((FT)0.0, (FT)0.0, z);
        Plane plane(p,normal);

        std::list<Object_and_primitive_id> intersections;
        tree.all_intersections(plane,std::back_inserter(intersections));

        std::list<Object_and_primitive_id>::iterator it;
        for(it = intersections.begin();
            it != intersections.end();
            it++)
        {
            Object_and_primitive_id op = *it;
            CGAL::Object object = op.first;
            Segment segment;
            if(CGAL::assign(segment,object))
                m_segments.push_back(segment);
        }
    }
    std::cout << m_segments.size() << " segments, " << timer.time() << " s." << std::endl;
    changed();
}

int main(){
    int N = 3;
    CGAL::Timer cost;
    std::vector<Point_d> points;
   

   Point_d point1(1,3,5);
   Point_d point2(4,8,10);
   Point_d point3(2,7,9);

    Point_d point(1,2,3);


    points.push_back(point1);
    points.push_back(point2);
    points.push_back(point3);
   
    K Kernel 
    D Dt(d,Kernel,Kernel);
  //  CGAL_assertion(Dt.empty());
   
    // insert the points in the triangulation
    cost.reset();cost.start();
    std::cout << "  Delaunay triangulation of "<<N<<" points in dim "<<d<< std::flush;
    std::vector<Point_d>::iterator it;
    for(it = points.begin(); it!= points.end(); ++it){
	Dt.insert(*it); 
    }
    std::list<Simplex_handle> NL = Dt.all_simplices(D::NEAREST);
    std::cout << " done in "<<cost.time()<<" seconds." << std::endl;
    CGAL_assertion(Dt.is_valid() );
    CGAL_assertion(!Dt.empty());
 
   
    Vertex_handle v = Dt.nearest_neighbor(point);
    Simplex_handle s = Dt.simplex(v);    
     
    std::vector<Point_d> Simplex_vertices;
    for(int j=0; j<=d; ++j){
 	  Vertex_handle vertex = Dt.vertex_of_simplex(s,j);
       	  Simplex_vertices.push_back(Dt.associated_point(vertex));
     }
    
    std::vector<K::FT> coords;
    K::Barycentric_coordinates_d BaryCoords;
    BaryCoords(Simplex_vertices.begin(), Simplex_vertices.end(),point,std::inserter(coords, coords.begin()));
    std::cout << coords[0] << std::endl; 
   return 0;
}

bool
load_cin_file(std::istream& ifs, SDG& sdg) {
  std::cerr << "Loading file... ";
  CGAL::Timer timer;
  timer.start();
  bool not_first = false;
  if(!ifs.good())
    return false;
  Point_2 p, q, qold;
  int point_counter = 0;
  SDGLinf::Site_2 site;
  while (ifs >> site) {
    //std::cout << site << std::endl;
    if (site.is_point()) {
      //std::cout << "site is point" << std::endl;
      q = site.point();
      points.push_back(q);
      ++point_counter;
    } else if (site.is_segment()) {
      //std::cout << "site is seg" << std::endl;
      p = site.source();
      q = site.target();
      if(not_first and (p == qold)) {
        points.push_back(q);
        //std::cout << "push pq old" << std::endl;
        constraints.push_back(std::make_pair(point_counter-1, point_counter));
        ++point_counter;
      }
      else {
        points.push_back(p);
        points.push_back(q);
        //std::cout << "push pq new" << std::endl;
        constraints.push_back(std::make_pair(point_counter, point_counter+1));
        point_counter += 2;
      }
    } else {
      if (not_first) {
        return false;
      } else {
        continue;
      }
    }
    qold = q;
    not_first = true;
  }
  std::cerr << "done (" << timer.time() << "s)" << std::endl;
  insert_constraints_using_spatial_sort(sdg);
  return true;
}