CGAL::ch_nswe_point

Definition

The function ch_nswe_point finds the four extreme points of a given set of input points using a linear scan of the input points. That is, it determines the points with maximal $$y, minimal $$y, minimal $$x, and maximal $$x coordinates.

#include <CGAL/ch_selected_extreme_points_2.h>

template <class ForwardIterator>
void	ch_nswe_point ( ForwardIterator first, ForwardIterator beyond, ForwardIterator& n, ForwardIterator& s, ForwardIterator& w, ForwardIterator& e, Traits ch_traits = Default_traits)
		traverses the range [first,beyond). After execution, the value of n is an iterator in the range such that *n $$ yx *it for all iterators it in the range. Similarly, for s, w, and e the inequalities *s $$ yx *it, *w $$ xy *it, and *e $$ xy *it hold for all iterators it in the range.

Requirements

• Traits::Less_xy_2,
• Traits::Less_yx_2.

The default traits class Default_traits is the kernel in which the type ForwardIterator::value_type is defined.

See Also

CGAL::ch_e_point
CGAL::ch_n_point
CGAL::ch_ns_point
CGAL::ch_s_point
CGAL::ch_w_point
CGAL::ch_we_point