gis::Point Class Reference

A 2d point. More...

#include <geometries.h>

Inheritance diagram for gis::Point:

Public Member Functions
	Point ()
	Point (double x, double y)
Geometry_type	type () const override
	Gets the geometry type of the object. More...
bool	accept (Geometry_visitor *v) override
	Applies a hierarchical visitor to this geometry. More...
bool	is_empty () const override
	Check if this is an empty geometry. More...
Point *	clone () const override=0
template<std::size_t K>
double	get () const
	Gets a coordinate value. More...
double	x () const
	Gets the first coordinate value. More...
double	y () const
	Gets the second coordinate value. More...
template<std::size_t K>
void	set (double d)
	Sets a coordinate. More...
void	x (double d)
	Sets the first coordinate value. More...
void	y (double d)
	Sets the second coordinate value. More...
template<>
double	get () const
template<>
double	get () const
template<>
void	set (double d)
template<>
void	set (double d)
Public Member Functions inherited from gis::Geometry
	Geometry ()=default
virtual	~Geometry ()=default
	Geometry (const Geometry &)=default
Geometry &	operator= (const Geometry &)=default
virtual Coordinate_system	coordinate_system () const =0
	Gets the coordinate system. More...

Private Attributes
double	m_x
	First coordinate (X or longitude). More...
double	m_y
	Second coordinate (Y or latitude). More...

Detailed Description

A 2d point.

Point is an instantiable type in SQL.

Constructor & Destructor Documentation

Point() [1/2]

gis::Point::Point ( )

inline

Point() [2/2]

gis::Point::Point ( double  x, double  y  )

inline

Member Function Documentation

accept()

bool gis::Point::accept ( Geometry_visitor *  v )

overridevirtual

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.

Implements gis::Geometry.

clone()

Point * gis::Point::clone ( ) const

overridepure virtual

Implements gis::Geometry.

Implemented in gis::Cartesian_point, and gis::Geographic_point.

get() [1/3]

template<>

double gis::Point::get

(

)

const

get() [2/3]

template<>

double gis::Point::get

(

)

const

get() [3/3]

template<std::size_t K>

double gis::Point::get

(

)

const

Gets a coordinate value.

This function signature must match the expectations of Boost.Geometry.

Template Parameters

K	Coordinate number, zero indexed.

Returns

The coordinate value.

is_empty()

bool gis::Point::is_empty ( ) const

inlineoverridevirtual

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.

Implements gis::Geometry.

set() [1/3]

template<>

void gis::Point::set

(

double

d

)

set() [2/3]

template<>

void gis::Point::set

(

double

d

)

set() [3/3]

template<std::size_t K>

void gis::Point::set

(

double

d

)

Sets a coordinate.

This function signature must match the expectations of Boost.Geometry.

Template Parameters

K	Coordinate number, zero indexed.

Parameters

d	The coordinate value.

type()

Geometry_type gis::Point::type ( ) const

inlineoverridevirtual

Gets the geometry type of the object.

Returns

The type of this object

Implements gis::Geometry.

x() [1/2]

double gis::Point::x

(

)

const

Gets the first coordinate value.

For geographic points, the first coordinate is longitude.

Returns

The first coordinate value.

x() [2/2]

void gis::Point::x

(

double

d

)

Sets the first coordinate value.

For geographic points, the first coordinate is longitude.

Parameters

d	The coordinate value.

y() [1/2]

double gis::Point::y

(

)

const

Gets the second coordinate value.

For geographic points, the second coordinate is latitude.

Returns

The second coordinate value.

y() [2/2]

void gis::Point::y

(

double

d

)

Sets the second coordinate value.

For geographic points, the second coordinate is latitude.

Parameters

d	The coordinate value.

Member Data Documentation

m_x

double gis::Point::m_x

private

First coordinate (X or longitude).

Geographic coordinates are in radians, positive to the East of Greenwich. Cartesian coordinates are in the SRSs length unit.

m_y

double gis::Point::m_y

private

Second coordinate (Y or latitude).

Geographic coordinates are in radians, positive to the North of the Equator. Cartesian coordinates are in the SRSs length unit.

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

• sql/gis/geometries.h
• sql/gis/geometries.cc