gis::Geometry Class Reference

Abstract superclass for all geometric objects. More...

#include <geometries.h>

Inheritance diagram for gis::Geometry:

Public Member Functions
	Geometry ()=default
virtual	~Geometry ()=default
	Geometry (const Geometry &)=default
Geometry &	operator= (const Geometry &)=default
virtual Geometry *	clone () const =0
virtual Geometry_type	type () const =0
	Gets the geometry type of the object. More...
virtual Coordinate_system	coordinate_system () const =0
	Gets the coordinate system. More...
virtual bool	accept (Geometry_visitor *v)=0
	Applies a hierarchical visitor to this geometry. More...
virtual bool	is_empty () const =0
	Check if this is an empty geometry. More...

Detailed Description

Abstract superclass for all geometric objects.

Geometry is a non-instantiable type in SQL.

The hierarchy is first divided into abstract classes according to the SFA-CA geometry type hierarchy, and then divided into concrete subclasses for each coordinate system.

Constructor & Destructor Documentation

Geometry() [1/2]

gis::Geometry::Geometry ( )

default

~Geometry()

virtual gis::Geometry::~Geometry ( )

virtualdefault

Geometry() [2/2]

gis::Geometry::Geometry ( const Geometry &  )

default

Member Function Documentation

accept()

virtual bool gis::Geometry::accept ( Geometry_visitor *  v )

pure virtual

Applies a hierarchical visitor to this geometry.

See also

gis::Geometry_visitor

Parameters

v	A hierarchical visitor.

Return values

true	The execution was aborted by the visitor.
false	The execution completed.

Implemented in gis::Point, gis::Cartesian_linestring, gis::Geographic_linestring, gis::Cartesian_linearring, gis::Geographic_linearring, gis::Cartesian_polygon, gis::Geographic_polygon, gis::Cartesian_geometrycollection, gis::Geographic_geometrycollection, gis::Cartesian_multipoint, gis::Geographic_multipoint, gis::Cartesian_multilinestring, gis::Geographic_multilinestring, gis::Cartesian_multipolygon, gis::Geographic_multipolygon, gis::Curve, gis::Linestring, gis::Linearring, gis::Surface, gis::Polygon, gis::Geometrycollection, gis::Multipoint, gis::Multicurve, gis::Multilinestring, gis::Multisurface, and gis::Multipolygon.

clone()

virtual Geometry * gis::Geometry::clone ( ) const

pure virtual

Implemented in gis::Cartesian_point, gis::Geographic_point, gis::Cartesian_linestring, gis::Geographic_linestring, gis::Cartesian_linearring, gis::Geographic_linearring, gis::Cartesian_polygon, gis::Geographic_polygon, gis::Cartesian_geometrycollection, gis::Geographic_geometrycollection, gis::Cartesian_multipoint, gis::Geographic_multipoint, gis::Cartesian_multilinestring, gis::Geographic_multilinestring, gis::Cartesian_multipolygon, gis::Geographic_multipolygon, gis::Point, gis::Linestring, gis::Polygon, gis::Geometrycollection, gis::Multipoint, gis::Multilinestring, and gis::Multipolygon.

coordinate_system()

virtual Coordinate_system gis::Geometry::coordinate_system ( ) const

pure virtual

Gets the coordinate system.

Returns

The coordinate system type.

Implemented in gis::Cartesian_point, gis::Geographic_point, gis::Cartesian_linestring, gis::Geographic_linestring, gis::Cartesian_linearring, gis::Geographic_linearring, gis::Cartesian_polygon, gis::Geographic_polygon, gis::Cartesian_geometrycollection, gis::Geographic_geometrycollection, gis::Cartesian_multipoint, gis::Geographic_multipoint, gis::Cartesian_multilinestring, gis::Geographic_multilinestring, gis::Cartesian_multipolygon, and gis::Geographic_multipolygon.

is_empty()

virtual bool gis::Geometry::is_empty ( ) const

pure virtual

Check if this is an empty geometry.

The definition of empty geometries is the one in SFA-CA (OGC 06-103r4, Sect. 6.1.2.2), i.e., an empty point set.

Note

This is different from the function "empty", which returns true if a geometry contains no subgeometries. E.g., a geometry collection may contain another geometry collection which is empty. In this case, the "empty" function would return false on the outermost geometry collection, while "is_empty" would return true.

Return values

true	The geometry represents the empty point set.
false	The geometry represent a non-empty point set.

Implemented in gis::Point, gis::Linestring, gis::Polygon, gis::Cartesian_linearring, gis::Geographic_linearring, gis::Cartesian_geometrycollection, gis::Geographic_geometrycollection, gis::Cartesian_multipoint, gis::Geographic_multipoint, gis::Cartesian_multilinestring, gis::Geographic_multilinestring, gis::Cartesian_multipolygon, and gis::Geographic_multipolygon.

operator=()

Geometry & gis::Geometry::operator= ( const Geometry &  )

default

type()

virtual Geometry_type gis::Geometry::type ( ) const

pure virtual

Gets the geometry type of the object.

Returns

The type of this object

Implemented in gis::Point, gis::Linestring, gis::Polygon, gis::Geometrycollection, gis::Multipoint, gis::Multilinestring, gis::Multipolygon, gis::Cartesian_linearring, gis::Geographic_linearring, gis::Curve, gis::Surface, gis::Multicurve, and gis::Multisurface.

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The documentation for this class was generated from the following file:

• sql/gis/geometries.h