CGAL 5.0 - Geometric Object Generators
Generator/random_segments2.cpp
// CGAL example program for the generic segment generator
// using precomputed point locations.
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <algorithm>
#include <vector>
#include <CGAL/point_generators_2.h>
#include <CGAL/function_objects.h>
#include <CGAL/Join_input_iterator.h>
#include <CGAL/Counting_iterator.h>
using namespace CGAL;
typedef K::Point_2 Point;
typedef K::Segment_2 Segment;
typedef std::vector<Segment> Vector;
int main() {
// Create test segment set. Prepare a vector for 100 segments.
Vector segs;
segs.reserve(100);
// A horizontal like fan.
PG p1( Point(-250, -50), Point(-250, 50),50); // Point generator.
PG p2( Point( 250,-250), Point( 250,250),50);
Segm_iterator t1( p1, p2); // Segment generator.
Count_iterator t1_begin( t1); // Finite range.
Count_iterator t1_end( t1, 50);
std::copy( t1_begin, t1_end, std::back_inserter(segs));
// A vertical like fan.
PG p3( Point( -50,-250), Point( 50,-250),50);
PG p4( Point(-250, 250), Point( 250, 250),50);
Segm_iterator t2( p3, p4);
Count_iterator t2_begin( t2);
Count_iterator t2_end( t2, 50);
std::copy( t2_begin, t2_end, std::back_inserter(segs));
CGAL_assertion( segs.size() == 100);
for ( Vector::iterator i = segs.begin(); i != segs.end(); i++){
CGAL_assertion( i->source().x() <= 250);
CGAL_assertion( i->source().x() >= -250);
CGAL_assertion( i->source().y() <= 250);
CGAL_assertion( i->source().y() >= -250);
CGAL_assertion( i->target().x() <= 250);
CGAL_assertion( i->target().x() >= -250);
CGAL_assertion( i->target().y() <= 250);
CGAL_assertion( i->target().y() >= -250);
}
return 0;
}