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

CGAL 4.8 - 2D Segment Delaunay Graphs

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Segment_Delaunay_graph_2/sdg-count-sites.cpp
// standard includes
#include <iostream>
#include <fstream>
#include <cassert>
// define the input kernel
#include <CGAL/Simple_cartesian.h>
typedef CGAL::Simple_cartesian<double> CK;
// typedefs for the traits and the algorithm
#include <CGAL/Segment_Delaunay_graph_filtered_traits_2.h>
#include <CGAL/Segment_Delaunay_graph_2.h>
typedef CGAL::Segment_Delaunay_graph_filtered_traits_2<
CK,CGAL::Field_with_sqrt_tag> Gt;
typedef CGAL::Segment_Delaunay_graph_2<Gt> SDG2;
using namespace std;
int main() {
ifstream ifs("data/sitesx.cin");
assert( ifs );
SDG2 sdg;
SDG2::Site_2 site;
while ( ifs >> site ) { sdg.insert( site ); }
ifs.close();
assert( sdg.is_valid(true, 1) );
cout << endl << endl;
// print the number of input and output sites
cout << "# of input sites : " << sdg.number_of_input_sites() << endl;
cout << "# of output sites: " << sdg.number_of_output_sites() << endl;
unsigned int n_ipt(0), n_iseg(0), n_opt(0), n_oseg(0), n_ptx(0);
// count the number of input points and input segments
SDG2::Input_sites_iterator iit;
for (iit = sdg.input_sites_begin(); iit != sdg.input_sites_end(); ++iit)
{
if ( iit->is_point() ) { n_ipt++; } else { n_iseg++; }
}
// count the number of output points and output segments, as well
// as the number of points that are points of intersection of pairs
// of strongly intersecting sites
SDG2::Output_sites_iterator oit;
for (oit = sdg.output_sites_begin(); oit != sdg.output_sites_end(); ++oit)
{
if ( oit->is_segment() ) { n_oseg++; } else {
n_opt++;
if ( !oit->is_input() ) { n_ptx++; }
}
}
cout << endl << "# of input segments: " << n_iseg << endl;
cout << "# of input points: " << n_ipt << endl << endl;
cout << "# of output segments: " << n_oseg << endl;
cout << "# of output points: " << n_opt << endl << endl;
cout << "# of intersection points: " << n_ptx << endl;
return 0;
}