\( \newcommand{\E}{\mathrm{E}} \) \( \newcommand{\A}{\mathrm{A}} \) \( \newcommand{\R}{\mathrm{R}} \) \( \newcommand{\N}{\mathrm{N}} \) \( \newcommand{\Q}{\mathrm{Q}} \) \( \newcommand{\Z}{\mathrm{Z}} \) \( \def\ccSum #1#2#3{ \sum_{#1}^{#2}{#3} } \def\ccProd #1#2#3{ \sum_{#1}^{#2}{#3} }\)
CGAL 4.14 - 2D Triangulation
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CGAL::Triangulation_cw_ccw_2 Class Reference
2D Triangulation Reference » Miscellaneous

#include <CGAL/Triangulation_2.h>

Inherited by CGAL::Triangulation_2< Traits, Tds >.

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.

neighbors.png
Vertices and neighbors.
See also
CGAL::Triangulation_2
TriangulationDSFaceBase_2

Creation

 Triangulation_cw_ccw_2 ()
 default constructor.
 

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.
 
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.