CGAL::Arrangement_2< Traits, Dcel >::Vertex Class Reference

#include <CGAL/Arrangement_2.h>

Inherits Vertex.

Definition

template<typename Traits, typename Dcel>
class CGAL::Arrangement_2< Traits, Dcel >::Vertex

An object \( v\) of the class Vertex represents an arrangement vertex, that is - a \( 0\)-dimensional cell, associated with a point on the plane.

Creation
	Vertex ()
	default constructor. More...

Access Functions
All non-const methods listed below also have const counterparts that return constant handles, iterators or circulators:
bool	is_at_open_boundary () const
	checks whether the vertex lies at infinity and not associated with a point with bounded coordinates. More...
bool	is_isolated () const
	checks whether the vertex is isolated (i.e., has no incident edges). More...
Size	degree () const
	returns the number of edges incident to v. More...
Halfedge_around_vertex_circulator	incident_halfedges ()
	returns a circulator circulator that allows going over the halfedges incident to v (that have v as their target). More...
Face_handle	face ()
	returns a handle to the face that contains v in its interior. More...
const Traits::Point_2 &	point () const
	returns the point associated with the vertex. More...
Arr_parameter_space	parameter_space_in_x () const
	returns the placement of the \( x\)-coordinate in the parameter space, that is, either the left boundary-side, the interior, or the right boundary-side. More...
Arr_parameter_space	parameter_space_in_y () const
	returns the placement of the \( y\)-coordinate in the parameter space, that is, either the bottom boundary-side, the interior, or the top boundary-side. More...

Constructor & Destructor Documentation

Vertex()

template<typename Traits , typename Dcel >

CGAL::Arrangement_2< Traits, Dcel >::Vertex::Vertex

(

)

default constructor.

Member Function Documentation

degree()

template<typename Traits , typename Dcel >

Size CGAL::Arrangement_2< Traits, Dcel >::Vertex::degree

(

)

const

returns the number of edges incident to v.

face()

template<typename Traits , typename Dcel >

Face_handle CGAL::Arrangement_2< Traits, Dcel >::Vertex::face

(

)

returns a handle to the face that contains v in its interior.

Precondition

v is an isolated vertex.

incident_halfedges()

template<typename Traits , typename Dcel >

Halfedge_around_vertex_circulator CGAL::Arrangement_2< Traits, Dcel >::Vertex::incident_halfedges

(

)

returns a circulator circulator that allows going over the halfedges incident to v (that have v as their target).

The edges are traversed in a clockwise direction around v.

Precondition

v is not an isolated vertex.

is_at_open_boundary()

template<typename Traits , typename Dcel >

bool CGAL::Arrangement_2< Traits, Dcel >::Vertex::is_at_open_boundary

(

)

const

checks whether the vertex lies at infinity and not associated with a point with bounded coordinates.

is_isolated()

template<typename Traits , typename Dcel >

bool CGAL::Arrangement_2< Traits, Dcel >::Vertex::is_isolated

(

)

const

checks whether the vertex is isolated (i.e., has no incident edges).

parameter_space_in_x()

template<typename Traits , typename Dcel >

Arr_parameter_space CGAL::Arrangement_2< Traits, Dcel >::Vertex::parameter_space_in_x

(

)

const

returns the placement of the \( x\)-coordinate in the parameter space, that is, either the left boundary-side, the interior, or the right boundary-side.

parameter_space_in_y()

template<typename Traits , typename Dcel >

Arr_parameter_space CGAL::Arrangement_2< Traits, Dcel >::Vertex::parameter_space_in_y

(

)

const

returns the placement of the \( y\)-coordinate in the parameter space, that is, either the bottom boundary-side, the interior, or the top boundary-side.

point()

template<typename Traits , typename Dcel >

const Traits::Point_2& CGAL::Arrangement_2< Traits, Dcel >::Vertex::point

(

)

const

returns the point associated with the vertex.

Precondition

v is not a vertex at infinity.