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

CGAL 4.8 - 2D Snap Rounding

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Snap_rounding_2/snap_rounding_to_integer.cpp
#include <CGAL/Cartesian.h>
#include <CGAL/Quotient.h>
#include <CGAL/MP_Float.h>
#include <CGAL/Snap_rounding_traits_2.h>
#include <CGAL/Snap_rounding_2.h>
typedef CGAL::Quotient<CGAL::MP_Float> Number_type;
typedef CGAL::Cartesian<Number_type> Kernel;
typedef CGAL::Snap_rounding_traits_2<Kernel> Traits;
typedef Kernel::Segment_2 Segment_2;
typedef Kernel::Point_2 Point_2;
typedef std::list<Segment_2> Segment_list_2;
typedef std::list<Point_2> Polyline_2;
typedef std::list<Polyline_2> Polyline_list_2;
int main()
{
Segment_list_2 seg_list;
Polyline_list_2 output_list;
seg_list.push_back(Segment_2(Point_2(0, 0), Point_2(10, 10)));
seg_list.push_back(Segment_2(Point_2(0, 10), Point_2(10, 0)));
seg_list.push_back(Segment_2(Point_2(3, 0), Point_2(3, 10)));
seg_list.push_back(Segment_2(Point_2(7, 0), Point_2(7, 10)));
// Generate an iterated snap-rounding representation, where the centers of
// the hot pixels are integers, using one kd tree, which is the default:
CGAL::snap_rounding_2<Traits,Segment_list_2::const_iterator,Polyline_list_2>
(seg_list.begin(), seg_list.end(), output_list, 1.0);
int counter = 0;
Polyline_list_2::const_iterator iter1;
for (iter1 = output_list.begin(); iter1 != output_list.end(); ++iter1) {
std::cout << "Polyline number " << ++counter << ":\n";
Polyline_2::const_iterator iter2;
for (iter2 = iter1->begin(); iter2 != iter1->end(); ++iter2)
std::cout << " (" << iter2->x() << ":" << iter2->y() << ")\n";
}
return(0);
}