CGAL 4.7 - 2D and 3D Linear Geometry Kernel
Kernel::CompareY_2 Concept Reference

## Definition

Refines:
AdaptableFunctor (with two arguments)
See Also
CGAL::compare_y()

## Operations

A model of this concept must provide:

Comparison_result operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q)
Compares the Cartesian $$y$$-coordinates of points p and q

Comparison_result operator() (const Kernel::Point_2 &p, const Kernel::Line_2 &l1, const Kernel::Line_2 &l2)
compares the $$y$$-coordinates of p and the intersection of lines l1 and l2. More...

Comparison_result operator() (const Kernel::Line_2 &l, const Kernel::Line_2 &h1, const Kernel::Line_2 &h2)
compares the $$y$$-coordinates of the intersection of line l with line h1 and with line h2. More...

Comparison_result operator() (const Kernel::Line_2 &l1, const Kernel::Line_2 &l2, const Kernel::Line_2 &h1, const Kernel::Line_2 &h2)
compares the $$y$$-coordinates of the intersection of lines l1 and l2 and the intersection of lines h1 and h2. More...

## Member Function Documentation

 Comparison_result Kernel::CompareY_2::operator() ( const Kernel::Point_2 & p, const Kernel::Line_2 & l1, const Kernel::Line_2 & l2 )

compares the $$y$$-coordinates of p and the intersection of lines l1 and l2.

See Figure fig-compare14 (a).

 Comparison_result Kernel::CompareY_2::operator() ( const Kernel::Line_2 & l, const Kernel::Line_2 & h1, const Kernel::Line_2 & h2 )

compares the $$y$$-coordinates of the intersection of line l with line h1 and with line h2.

See Figure fig-compare14 (b).

 Comparison_result Kernel::CompareY_2::operator() ( const Kernel::Line_2 & l1, const Kernel::Line_2 & l2, const Kernel::Line_2 & h1, const Kernel::Line_2 & h2 )

compares the $$y$$-coordinates of the intersection of lines l1 and l2 and the intersection of lines h1 and h2.

See Figure fig-compare14 (c).