geos::linearref::LengthIndexOfPoint Class Reference

Computes the length index of the point on a linear Geometry nearest a given Coordinate. More...

#include <LengthIndexOfPoint.h>

Collaboration diagram for geos::linearref::LengthIndexOfPoint:

Public Member Functions
	LengthIndexOfPoint (const geom::Geometry *linearGeom)
double	indexOf (const geom::Coordinate &inputPt) const
double	indexOfAfter (const geom::Coordinate &inputPt, double minIndex) const
	Finds the nearest index along the linear Geometry to a given Coordinate after the specified minimum index. More...

Static Public Member Functions
static double	indexOf (const geom::Geometry *linearGeom, const geom::Coordinate &inputPt)
static double	indexOfAfter (const geom::Geometry *linearGeom, const geom::Coordinate &inputPt, double minIndex)

Private Member Functions
double	indexOfFromStart (const geom::Coordinate &inputPt, const double minIndex) const
double	segmentNearestMeasure (const geom::LineSegment *seg, const geom::Coordinate &inputPt, double segmentStartMeasure) const

Private Attributes
const geom::Geometry *	linearGeom

Detailed Description

Computes the length index of the point on a linear Geometry nearest a given Coordinate.

The nearest point is not necessarily unique; this class always computes the nearest point closest to the start of the geometry.

Definition at line 43 of file LengthIndexOfPoint.h.

Constructor & Destructor Documentation

geos::linearref::LengthIndexOfPoint::LengthIndexOfPoint

(

const geom::Geometry *

linearGeom

)

Member Function Documentation

static double geos::linearref::LengthIndexOfPoint::indexOf ( const geom::Geometry *  linearGeom, const geom::Coordinate &  inputPt  )

static

double geos::linearref::LengthIndexOfPoint::indexOf

(

const geom::Coordinate &

inputPt

)

const

Find the nearest location along a linear Geometry to a given point.

Parameters

inputPt

the coordinate to locate

Returns

the location of the nearest point

static double geos::linearref::LengthIndexOfPoint::indexOfAfter ( const geom::Geometry *  linearGeom, const geom::Coordinate &  inputPt, double  minIndex  )

static

double geos::linearref::LengthIndexOfPoint::indexOfAfter	(	const geom::Coordinate &	inputPt,
		double	minIndex
	)		const

Finds the nearest index along the linear Geometry to a given Coordinate after the specified minimum index.

If possible the location returned will be strictly greater than the minLocation. If this is not possible, the value returned will equal minLocation. (An example where this is not possible is when minLocation = [end of line] ).

Parameters

inputPt	the coordinate to locate
minIndex	the minimum location for the point location

Returns

the location of the nearest point

double geos::linearref::LengthIndexOfPoint::indexOfFromStart ( const geom::Coordinate &  inputPt, const double  minIndex  ) const

private

double geos::linearref::LengthIndexOfPoint::segmentNearestMeasure ( const geom::LineSegment *  seg, const geom::Coordinate &  inputPt, double  segmentStartMeasure  ) const

private

Member Data Documentation

const geom::Geometry* geos::linearref::LengthIndexOfPoint::linearGeom

private

Definition at line 46 of file LengthIndexOfPoint.h.

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

• LengthIndexOfPoint.h