Nef_polyhedron_S2<Traits>::SHalfloop

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CGAL::Nef_polyhedron_S2<Traits>::SHalfloop

Definition

A sloop is a great circle on a sphere. A shalfloop is an oriented sloop. It is always paired with a shalfloop whose supporting Sphere_circle is pointing in the opposite direction. The twin() member function returns this shalfloop of opposite orientation. Each Nef_polyhedron_S2 can only have one sloop (resp. two shalfloops).

The figure below depicts the relationship between a shalfloop and sfaces on a sphere map.

Figure 21.3: Incidences of an SHalfloop

#include <CGAL/Nef_polyhedron_S2.h>

Types

The following types are the same as in Nef_polyhedron_S2<Traits>.

Nef_polyhedron_S2<Traits>::SHalfloop::Mark
	type of mark.

Nef_polyhedron_S2<Traits>::SHalfloop::Sphere_circle
	sphere circle type stored in SHalfloop.

Nef_polyhedron_S2<Traits>::SHalfloop::SHalfloop_const_handle
	const handle to SHalfloop.
Nef_polyhedron_S2<Traits>::SHalfloop::SFace_const_handle
	const handle to SFace.

Creation

There is no need for a user to create a SHalfloop explicitly. The class Nef_polyhedron_S2<Traits> manages the needed shalfloops internally.

Operations

Mark	se.mark () const	the mark of se .

Sphere_circle	se.circle () const	the sphere circle of se .

SHalfloop_const_handle	se.twin () const	the twin of se .

SFace_const_handle	se.incident_sface () const	the incident sface of se .

CGAL::Nef_polyhedron_S2<Traits>::SHalfloop

Definition

Types

Creation

Operations

See Also