CGAL 5.1.3 - 2D Conforming Triangulations and Meshes
DelaunayMeshFaceBase_2 Concept Reference

## Definition

The concept DelaunayMeshFaceBase_2 refines the concept TriangulationFaceBase_2. It adds two functions giving access to a Boolean marker, that indicates if the face is in the meshing domain or not.

Refines:
ConstrainedTriangulationFaceBase_2
Has Models:
CGAL::Delaunay_mesh_face_base_2<Traits, Fb>

## Typedef

typedef std::pair< DelaunayMeshFaceBase_2, int > Edge
A typedef to describe an edge.

## Functions

bool is_in_domain () const
returns true if this face is in the domain to be refined.

void set_in_domain (const bool b)
sets if this face is in the domain.

bool is_blind () const
returns true if this face has its circumcenter hidden by a constrained edge. More...

void set_blind (const bool b)
sets if this face is blind or not.

Edge blinding_constraint () const
If this face is blind, this function returns the first constrained edge that prevents it from "seeing" its circumcenter. More...

void set_blinding_constraint (const Egde &e)
sets the edge that makes this face blind. More...

## ◆ blinding_constraint()

 Edge DelaunayMeshFaceBase_2::blinding_constraint ( ) const

If this face is blind, this function returns the first constrained edge that prevents it from "seeing" its circumcenter.

Precondition
is_blind() returns true

## ◆ is_blind()

 bool DelaunayMeshFaceBase_2::is_blind ( ) const

returns true if this face has its circumcenter hidden by a constrained edge.

It does not "see" it, following the Constrained Delaunay triangulation visibility criterion.

## ◆ set_blinding_constraint()

 void DelaunayMeshFaceBase_2::set_blinding_constraint ( const Egde & e )

sets the edge that makes this face blind.

Precondition
is_blind() returns true
e is a constrained edge