Definition

The class Triangulation_cw_ccw_2 offers two functions int cw(int i) and int ccw(int i) which, given the index of a vertex in a face, compute the index of the next vertex of the same face in clockwise or counterclockwise order. This works also for neighbor indexes. Thus, for example the neighbor neighbor(cw(i)) of a face f is the neighbor which is next to neighbor(i) turning clockwise around f. The face neighbor(cw(i)) is also the first face encountered after f when turning clockwise around vertex i of f.

Many of the classes in the triangulation package inherit from Triangulation_cw_ccw_2. This is for instance the case for CGAL::Triangulation_2::Face. Thus, for example the neighbor neighbor(cw(i)) of a face f is the neighbor which is next to neighbor(i) turning clockwise around f. The face neighbor(cw(i)) is also the first face encountered after f when turning clockwise around vertex i of f.

Vertices and neighbors.

See also: CGAL::Triangulation_2; TriangulationDSFaceBase_2

Creation
	Triangulation_cw_ccw_2 ()
	default constructor. More...

Operations
int	ccw (const int i) const
	returns the index of the neighbor or vertex that is next to the neighbor or vertex with index `i` in counterclockwise order around a face. More...

int	cw (const int i) const
	returns the index of the neighbor or vertex that is next to the neighbor or vertex with index `i` in counterclockwise order around a face. More...

Constructor & Destructor Documentation

◆ Triangulation_cw_ccw_2()

CGAL::Triangulation_cw_ccw_2::Triangulation_cw_ccw_2 ( )

default constructor.

Member Function Documentation

◆ ccw()

int CGAL::Triangulation_cw_ccw_2::ccw ( const int i ) const

returns the index of the neighbor or vertex that is next to the neighbor or vertex with index i in counterclockwise order around a face.

◆ cw()

int CGAL::Triangulation_cw_ccw_2::cw ( const int i ) const