Represents a location along a LineString or MultiLineString. More...

#include <LinearLocation.h>

Public Member Functions
	LinearLocation (std::size_t segmentIndex=0, double segmentFraction=0.0)
	Creates a location referring to the start of a linear geometry.

	LinearLocation (std::size_t componentIndex, std::size_t segmentIndex, double segmentFraction)

void	clamp (const geom::Geometry *linear)
	Ensures the indexes are valid for a given linear Geometry.

void	snapToVertex (const geom::Geometry *linearGeom, double minDistance)
	Snaps the value of this location to the nearest vertex on the given linear Geometry, if the vertex is closer than `minDistance`.

double	getSegmentLength (const geom::Geometry *linearGeom) const
	Gets the length of the segment in the given Geometry containing this location.

void	setToEnd (const geom::Geometry *linear)
	Sets the value of this location to refer the end of a linear geometry.

std::size_t	getComponentIndex () const
	Gets the component index for this location.

std::size_t	getSegmentIndex () const
	Gets the segment index for this location.

double	getSegmentFraction () const
	Gets the segment fraction for this location.

bool	isVertex () const
	Tests whether this location refers to a vertex.

geom::Coordinate	getCoordinate (const geom::Geometry *linearGeom) const
	Gets the Coordinate along the given linear Geometry which is referenced by this location.

std::unique_ptr< geom::LineSegment >	getSegment (const geom::Geometry *linearGeom) const
	Gets a LineSegment representing the segment of the given linear Geometry which contains this location.

bool	isValid (const geom::Geometry *linearGeom) const
	Tests whether this location refers to a valid location on the given linear Geometry.

int	compareTo (const LinearLocation &other) const
	Compares this object with the specified object for order.

int	compareLocationValues (std::size_t componentIndex1, std::size_t segmentIndex1, double segmentFraction1) const
	Compares this object with the specified index values for order.

bool	isOnSameSegment (const LinearLocation &loc) const
	Tests whether two locations are on the same segment in the parent Geometry.

bool	isEndpoint (const geom::Geometry &linearGeom) const
	Tests whether this location is an endpoint of the linear component it refers to.

Static Public Member Functions
static LinearLocation	getEndLocation (const geom::Geometry *linear)
	Gets a location which refers to the end of a linear Geometry.

static geom::Coordinate	pointAlongSegmentByFraction (const geom::Coordinate &p0, const geom::Coordinate &p1, double frac)
	Computes the Coordinate of a point a given fraction along the line segment `(p0, p1)`.

static int	compareLocationValues (std::size_t componentIndex0, std::size_t segmentIndex0, double segmentFraction0, std::size_t componentIndex1, std::size_t segmentIndex1, double segmentFraction1)
	Compares two sets of location values for order.

Friends
std::ostream &	operator<< (std::ostream &out, const LinearLocation &obj)

Detailed Description

Represents a location along a LineString or MultiLineString.

The referenced geometry is not maintained within this location, but must be provided for operations which require it. Various methods are provided to manipulate the location value and query the geometry it references.

Member Function Documentation

◆ clamp()

void geos::linearref::LinearLocation::clamp ( const geom::Geometry * linear )

Ensures the indexes are valid for a given linear Geometry.

Parameters

linear a linear geometry

Referenced by geos::linearref::LocationIndexedLine::clampIndex().

◆ compareLocationValues() [1/2]

static int geos::linearref::LinearLocation::compareLocationValues	(	std::size_t	componentIndex0,
		std::size_t	segmentIndex0,
		double	segmentFraction0,
		std::size_t	componentIndex1,
		std::size_t	segmentIndex1,
		double	segmentFraction1
	)

static

Compares two sets of location values for order.

Parameters

componentIndex0	a component index
segmentIndex0	a segment index
segmentFraction0	a segment fraction
componentIndex1	another component index
segmentIndex1	another segment index
segmentFraction1	another segment fraction

Returns: a negative integer, zero, or a positive integer as the first set of location values is less than, equal to, or greater than the second set of locationValues

◆ compareLocationValues() [2/2]

int geos::linearref::LinearLocation::compareLocationValues	(	std::size_t	componentIndex1,
		std::size_t	segmentIndex1,
		double	segmentFraction1
	)		const

Compares this object with the specified index values for order.

Parameters

componentIndex1	a component index
segmentIndex1	a segment index
segmentFraction1	a segment fraction

Returns: a negative integer, zero, or a positive integer as this LinearLocation is less than, equal to, or greater than the specified locationValues

◆ compareTo()

int geos::linearref::LinearLocation::compareTo ( const LinearLocation & other ) const

Compares this object with the specified object for order.

Parameters

other the LinearLocation with which this Coordinate is being compared

Returns: a negative integer, zero, or a positive integer as this LinearLocation is less than, equal to, or greater than the specified LinearLocation

◆ getComponentIndex()

std::size_t geos::linearref::LinearLocation::getComponentIndex ( ) const

Gets the component index for this location.

Returns: the component index

◆ getCoordinate()

geom::Coordinate geos::linearref::LinearLocation::getCoordinate ( const geom::Geometry * linearGeom ) const

Gets the Coordinate along the given linear Geometry which is referenced by this location.

Parameters

linearGeom the linear geometry referenced by this location

Returns: the Coordinate at the location

Referenced by geos::linearref::LocationIndexedLine::extractPoint().

◆ getEndLocation()

static LinearLocation geos::linearref::LinearLocation::getEndLocation ( const geom::Geometry * linear )

static

Gets a location which refers to the end of a linear Geometry.

Parameters

linear the linear geometry

Returns: a new LinearLocation

◆ getSegment()

std::unique_ptr< geom::LineSegment > geos::linearref::LinearLocation::getSegment ( const geom::Geometry * linearGeom ) const

Gets a LineSegment representing the segment of the given linear Geometry which contains this location.

Parameters

linearGeom a linear geometry

Returns: the LineSegment containing the location

Referenced by geos::linearref::LocationIndexedLine::extractPoint().

◆ getSegmentFraction()

double geos::linearref::LinearLocation::getSegmentFraction ( ) const

Gets the segment fraction for this location.

Returns: the segment fraction

Referenced by geos::linearref::LocationIndexedLine::extractPoint().

◆ getSegmentIndex()

std::size_t geos::linearref::LinearLocation::getSegmentIndex ( ) const

Gets the segment index for this location.

Returns: the segment index

◆ getSegmentLength()

double geos::linearref::LinearLocation::getSegmentLength ( const geom::Geometry * linearGeom ) const

Gets the length of the segment in the given Geometry containing this location.

Parameters

linearGeom a linear geometry

Returns: the length of the segment

◆ isEndpoint()

bool geos::linearref::LinearLocation::isEndpoint ( const geom::Geometry & linearGeom ) const

Tests whether this location is an endpoint of the linear component it refers to.

Parameters

linearGeom the linear geometry referenced by this location

Returns: true if the location is a component endpoint

◆ isOnSameSegment()

bool geos::linearref::LinearLocation::isOnSameSegment ( const LinearLocation & loc ) const

Tests whether two locations are on the same segment in the parent Geometry.

Parameters

loc	a location on the same geometry

Returns: true if the locations are on the same segment of the parent geometry

◆ isValid()

bool geos::linearref::LinearLocation::isValid ( const geom::Geometry * linearGeom ) const

Tests whether this location refers to a valid location on the given linear Geometry.

Parameters

linearGeom a linear geometry

Returns: true if this location is valid

Referenced by geos::linearref::LocationIndexedLine::isValidIndex().

◆ isVertex()

bool geos::linearref::LinearLocation::isVertex ( ) const

Tests whether this location refers to a vertex.

Returns: true if the location is a vertex

◆ pointAlongSegmentByFraction()

static geom::Coordinate geos::linearref::LinearLocation::pointAlongSegmentByFraction	(	const geom::Coordinate &	p0,
		const geom::Coordinate &	p1,
		double	frac
	)

static

Computes the Coordinate of a point a given fraction along the line segment (p0, p1).

If the fraction is greater than 1.0 the last point of the segment is returned. If the fraction is less than or equal to 0.0 the first point of the segment is returned. The Z ordinate is interpolated from the Z-ordinates of the given points, if they are specified.

Parameters

p0	the first point of the line segment
p1	the last point of the line segment
frac	the length to the desired point

Returns: the Coordinate of the desired point

◆ setToEnd()

void geos::linearref::LinearLocation::setToEnd ( const geom::Geometry * linear )

Sets the value of this location to refer the end of a linear geometry.

Parameters

linear the linear geometry to set

◆ snapToVertex()

void geos::linearref::LinearLocation::snapToVertex	(	const geom::Geometry *	linearGeom,
		double	minDistance
	)

Snaps the value of this location to the nearest vertex on the given linear Geometry, if the vertex is closer than minDistance.

Parameters

linearGeom	a linear geometry
minDistance	the minimum allowable distance to a vertex

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

LinearLocation.h

Public Member Functions

Static Public Member Functions

Friends

Detailed Description

Member Function Documentation

◆ clamp()

◆ compareLocationValues() [1/2]

◆ compareLocationValues() [2/2]

◆ compareTo()

◆ getComponentIndex()

◆ getCoordinate()

◆ getEndLocation()

◆ getSegment()

◆ getSegmentFraction()

◆ getSegmentIndex()

◆ getSegmentLength()

◆ isEndpoint()

◆ isOnSameSegment()

◆ isValid()

◆ isVertex()

◆ pointAlongSegmentByFraction()

◆ setToEnd()

◆ snapToVertex()