GEOS 3.3.4

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geos::linearref::LengthIndexOfPoint Class Reference

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

`#include <LengthIndexOfPoint.h>`

## 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.

## 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)

## 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.

## Member Function Documentation

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

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
  minLocation | the minimum location for the point location

Returns
  the location of the nearest point

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

- LengthIndexOfPoint.h