CGAL 4.7 - Geometric Object Generators: Generator/random_segments2.cpp

\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)

CGAL 4.7 - Geometric Object Generators

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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 Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_2 Point;
typedef K::Segment_2 Segment;
typedef Points_on_segment_2<Point> PG;
typedef Creator_uniform_2< Point, Segment> Creator;
typedef Join_input_iterator_2< PG, PG, Creator> Segm_iterator;
typedef Counting_iterator<Segm_iterator,Segment> Count_iterator;
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;
}