PointLocator

java.lang.Object
- org.locationtech.jts.algorithm.PointLocator

```
public class PointLocator
extends java.lang.Object
```
Computes the topological (Location) of a single point to a Geometry. A BoundaryNodeRule may be specified to control the evaluation of whether the point lies on the boundary or not The default rule is to use the the SFS Boundary Determination Rule
Notes:
- LinearRings do not enclose any area - points inside the ring are still in the EXTERIOR of the ring.
Instances of this class are not reentrant.
Version:

1.7

Field Summary

Fields
Modifier and Type Field Description

private BoundaryNodeRule boundaryRule

private boolean isIn

private int numBoundaries

Constructor Summary

Constructors
Constructor Description

PointLocator()

PointLocator(BoundaryNodeRule boundaryRule)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`private void`	`computeLocation(Coordinate p, Geometry geom)`
`boolean`	`intersects(Coordinate p, Geometry geom)`	Convenience method to test a point for intersection with a Geometry
`int`	`locate(Coordinate p, Geometry geom)`	Computes the topological relationship (`Location`) of a single point to a Geometry.
`private int`	`locateInPolygon(Coordinate p, Polygon poly)`
`private int`	`locateInPolygonRing(Coordinate p, LinearRing ring)`
`private int`	`locateOnLineString(Coordinate p, LineString l)`
`private int`	`locateOnPoint(Coordinate p, Point pt)`
`private void`	`updateLocationInfo(int loc)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

boundaryRule
```
private BoundaryNodeRule boundaryRule
```

isIn
```
private boolean isIn
```

numBoundaries
```
private int numBoundaries
```

Constructor Detail

PointLocator
```
public PointLocator()
```

PointLocator

public PointLocator(BoundaryNodeRule boundaryRule)

Method Detail

intersects
```
public boolean intersects(Coordinate p,
                          Geometry geom)
```
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

locate
```
public int locate(Coordinate p,
                  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 Geometries takes into account the SFS Boundary Determination Rule.

Returns:

the Location of the point relative to the input Geometry

computeLocation

private void computeLocation(Coordinate p,
                             Geometry geom)

updateLocationInfo

private void updateLocationInfo(int loc)

locateOnPoint

private int locateOnPoint(Coordinate p,
                          Point pt)

locateOnLineString

private int locateOnLineString(Coordinate p,
                               LineString l)

locateInPolygonRing

private int locateInPolygonRing(Coordinate p,
                                LinearRing ring)

locateInPolygon

private int locateInPolygon(Coordinate p,
                            Polygon poly)