CGAL 5.1.2 - 2D Boolean Operations on Nef Polygons Embedded on the Sphere
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#include <CGAL/Nef_polyhedron_S2.h>
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.
There is no need for a user to create a SHalfloop
explicitly. The class Nef_polyhedron_S2<Traits>
manages the needed shalfloops internally.
Types | |
The following types are the same as in | |
typedef unspecified_type | Mark |
type of mark. | |
typedef unspecified_type | Sphere_circle |
sphere circle type stored in SHalfloop. | |
typedef unspecified_type | SHalfloop_const_handle |
const handle to SHalfloop. | |
typedef unspecified_type | SFace_const_handle |
const handle to SFace. | |
Operations | |
const Mark & | mark () const |
the mark of the halfloop. | |
const Sphere_circle & | circle () const |
the sphere circle of the halfloop. | |
SHalfloop_const_handle | twin () const |
the twin of the halfloop. | |
SFace_const_handle | incident_sface () const |
the incident sface of the halfloop. | |