geos::operation::distance::DistanceOp Class Reference

Find two points on two geom::Geometrys which lie within a given distance, or else are the nearest points on the geometries (in which case this also provides the distance between the geometries). More...

#include <DistanceOp.h>

Public Member Functions
	DistanceOp (const geom::Geometry *g0, const geom::Geometry *g1)
	DistanceOp (const geom::Geometry &g0, const geom::Geometry &g1)
	Constructs a DistanceOp that computes the distance and nearest points between the two specified geometries.
	DistanceOp (const geom::Geometry &g0, const geom::Geometry &g1, double terminateDistance)
	Constructs a DistanceOp that computes the distance and nearest points between the two specified geometries.
double	distance ()
std::unique_ptr< geom::CoordinateSequence >	nearestPoints ()

Static Public Member Functions
static double	distance (const geom::Geometry &g0, const geom::Geometry &g1)
	Compute the distance between the nearest points of two geometries.
static double	distance (const geom::Geometry *g0, const geom::Geometry *g1)
static bool	isWithinDistance (const geom::Geometry &g0, const geom::Geometry &g1, double distance)
	Test whether two geometries lie within a given distance of each other.
static std::unique_ptr< geom::CoordinateSequence >	nearestPoints (const geom::Geometry *g0, const geom::Geometry *g1)

Detailed Description

Find two points on two geom::Geometrys which lie within a given distance, or else are the nearest points on the geometries (in which case this also provides the distance between the geometries).

The distance computation also finds a pair of points in the input geometries which have the minimum distance between them. If a point lies in the interior of a line segment, the coordinate computed is a close approximation to the exact point.

Empty geometry collection components are ignored.

The algorithms used are straightforward O(n^2) comparisons. This worst-case performance could be improved on by using Voronoi techniques or spatial indexes.

Constructor & Destructor Documentation

DistanceOp() [1/3]

geos::operation::distance::DistanceOp::DistanceOp	(	const geom::Geometry *	g0,
		const geom::Geometry *	g1
	)

Deprecated:

use the one taking references

DistanceOp() [2/3]

geos::operation::distance::DistanceOp::DistanceOp	(	const geom::Geometry &	g0,
		const geom::Geometry &	g1
	)

Constructs a DistanceOp that computes the distance and nearest points between the two specified geometries.

Parameters

g0	a Geometry
g1	a Geometry

DistanceOp() [3/3]

geos::operation::distance::DistanceOp::DistanceOp	(	const geom::Geometry &	g0,
		const geom::Geometry &	g1,
		double	terminateDistance
	)

Constructs a DistanceOp that computes the distance and nearest points between the two specified geometries.

Parameters

g0	a Geometry
g1	a Geometry
terminateDistance	the distance on which to terminate the search

Member Function Documentation

distance() [1/3]

double geos::operation::distance::DistanceOp::distance

(

)

Report the distance between the closest points on the input geometries.

Returns

the distance between the geometries

distance() [2/3]

static double geos::operation::distance::DistanceOp::distance ( const geom::Geometry &  g0, const geom::Geometry &  g1  )

static

Compute the distance between the nearest points of two geometries.

Parameters

g0	a geom::Geometry
g1	another geom::Geometry

Returns

the distance between the geometries

0 if either input geometry is empty

Exceptions

IllegalArgumentException

if either input geometry is null

distance() [3/3]

static double geos::operation::distance::DistanceOp::distance ( const geom::Geometry *  g0, const geom::Geometry *  g1  )

static

Deprecated:

, use the version taking references

isWithinDistance()

static bool geos::operation::distance::DistanceOp::isWithinDistance ( const geom::Geometry &  g0, const geom::Geometry &  g1, double  distance  )

static

Test whether two geometries lie within a given distance of each other.

Parameters

g0	a geom::Geometry
g1	another geom::Geometry
distance	the distance to test

Returns

true if g0.distance(g1) <= distance

nearestPoints() [1/2]

std::unique_ptr< geom::CoordinateSequence > geos::operation::distance::DistanceOp::nearestPoints

(

)

Report the coordinates of the nearest points in the input geometries. The points are presented in the same order as the input Geometries.

Returns

a pair of geom::Coordinates of the nearest points as a newly allocated object (ownership to caller)

nearestPoints() [2/2]

static std::unique_ptr< geom::CoordinateSequence > geos::operation::distance::DistanceOp::nearestPoints ( const geom::Geometry *  g0, const geom::Geometry *  g1  )

static

Compute the the nearest points of two geometries.

The points are presented in the same order as the input Geometries.

Parameters

g0	a geom::Geometry
g1	another geom::Geometry

Returns

the nearest points in the geometries, ownership to caller. A NULL return means one of the geometries is empty.

---

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

• DistanceOp.h