CGAL 5.5.1 - 2D and 3D Linear Geometry Kernel
Kernel::Angle_2 Concept Reference

## Definition

CGAL::angle()

## Operations

A model of this concept must provide:

Angle operator() (const Kernel::Vector_2 &u, const Kernel::Vector_2 &v)
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors u and v.

Angle operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q, const Kernel::Point_2 &r)
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the three points p, q, r (q being the vertex of the angle). More...

Angle operator() (const Kernel::Point_2 &p, const Kernel::Point_2 &q, const Kernel::Point_2 &r, const Kernel::Point_2 &s)
returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors pq, rs. More...

## ◆ operator()() [1/2]

 Angle Kernel::Angle_2::operator() ( const Kernel::Point_2 & p, const Kernel::Point_2 & q, const Kernel::Point_2 & r )

returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the three points p, q, r (q being the vertex of the angle).

The returned value is the same as operator()(p - q, r - q).

## ◆ operator()() [2/2]

 Angle Kernel::Angle_2::operator() ( const Kernel::Point_2 & p, const Kernel::Point_2 & q, const Kernel::Point_2 & r, const Kernel::Point_2 & s )

returns CGAL::OBTUSE, CGAL::RIGHT or CGAL::ACUTE depending on the angle formed by the two vectors pq, rs.

The returned value is the same as operator()(q - p, s - r).