geos::algorithm::PointLocator Class Reference

Computes the topological relationship (Location) of a single point to a Geometry. More...

#include <PointLocator.h>

Public Member Functions
	PointLocator ()
	~PointLocator ()
geom::Location	locate (const geom::Coordinate &p, const geom::Geometry *geom)
bool	intersects (const geom::Coordinate &p, const geom::Geometry *geom)

Private Member Functions
void	computeLocation (const geom::Coordinate &p, const geom::Geometry *geom)
void	updateLocationInfo (geom::Location loc)
geom::Location	locate (const geom::Coordinate &p, const geom::Point *pt)
geom::Location	locate (const geom::Coordinate &p, const geom::LineString *l)
geom::Location	locateInPolygonRing (const geom::Coordinate &p, const geom::LinearRing *ring)
geom::Location	locate (const geom::Coordinate &p, const geom::Polygon *poly)

Private Attributes
bool	isIn
int	numBoundaries

Detailed Description

Computes the topological relationship (Location) of a single point to a Geometry.

The algorithm obeys the SFS boundaryDetermination rule to correctly determine whether the point lies on the boundary or not.

Notes:

• instances of this class are not reentrant.
• LinearRing objects do not enclose any area (points inside the ring are still in the EXTERIOR of the ring.)

Definition at line 57 of file PointLocator.h.

Constructor & Destructor Documentation

geos::algorithm::PointLocator::PointLocator ( )

inline

Definition at line 59 of file PointLocator.h.

geos::algorithm::PointLocator::~PointLocator ( )

inline

Definition at line 60 of file PointLocator.h.

Member Function Documentation

void geos::algorithm::PointLocator::computeLocation ( const geom::Coordinate &  p, const geom::Geometry *  geom  )

private

bool geos::algorithm::PointLocator::intersects ( const geom::Coordinate &  p, const geom::Geometry *  geom  )

inline

Convenience method to test a point for intersection with a Geometry

Parameters

p	the coordinate to test
geom	the Geometry to test

Returns

true if the point is in the interior or boundary of the Geometry

Definition at line 81 of file PointLocator.h.

References geos::geom::EXTERIOR.

geom::Location geos::algorithm::PointLocator::locate	(	const geom::Coordinate &	p,
		const geom::Geometry *	geom
	)

Computes the topological relationship (Location) of a single point to a Geometry. It handles both single-element and multi-element Geometries. The algorithm for multi-part Geometriestakes into account the SFS Boundary Determination rule.

Returns

the Location of the point relative to the input Geometry

geom::Location geos::algorithm::PointLocator::locate ( const geom::Coordinate &  p, const geom::Point *  pt  )

private

geom::Location geos::algorithm::PointLocator::locate ( const geom::Coordinate &  p, const geom::LineString *  l  )

private

geom::Location geos::algorithm::PointLocator::locate ( const geom::Coordinate &  p, const geom::Polygon *  poly  )

private

geom::Location geos::algorithm::PointLocator::locateInPolygonRing ( const geom::Coordinate &  p, const geom::LinearRing *  ring  )

private

void geos::algorithm::PointLocator::updateLocationInfo ( geom::Location  loc )

private

Member Data Documentation

bool geos::algorithm::PointLocator::isIn

private

Definition at line 88 of file PointLocator.h.

int geos::algorithm::PointLocator::numBoundaries

private

Definition at line 90 of file PointLocator.h.

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

• PointLocator.h