org.locationtech.jts.operation.overlay.validate

Class OffsetPointGenerator

java.lang.Object

org.locationtech.jts.operation.overlay.validate.OffsetPointGenerator

public class OffsetPointGenerator
extends java.lang.Object

Generates points offset by a given distance from both sides of the midpoint of all segments in a Geometry. Can be used to generate probe points for determining whether a polygonal overlay result is incorrect. The input geometry may have any orientation for its rings, but setSidesToGenerate(boolean, boolean) is only meaningful if the orientation is known.

Version:

1.7

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	doLeft
private boolean	doRight
private Geometry	g

Constructor Summary

Constructors

Constructor and Description
OffsetPointGenerator(Geometry g)

Method Summary

Modifier and Type	Method and Description
private void	computeOffsetPoints(Coordinate p0, Coordinate p1, double offsetDistance, java.util.List offsetPts) Generates the two points which are offset from the midpoint of the segment (p0, p1) by the offsetDistance.
private void	extractPoints(LineString line, double offsetDistance, java.util.List offsetPts)
java.util.List	getPoints(double offsetDistance) Gets the computed offset points.
void	setSidesToGenerate(boolean doLeft, boolean doRight) Set the sides on which to generate offset points.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

g

private Geometry g

doLeft

private boolean doLeft

doRight

private boolean doRight

Constructor Detail

OffsetPointGenerator

public OffsetPointGenerator(Geometry g)

Method Detail

setSidesToGenerate

public void setSidesToGenerate(boolean doLeft,
                               boolean doRight)

Set the sides on which to generate offset points.

Parameters:

doLeft -

doRight -

getPoints

public java.util.List getPoints(double offsetDistance)

Gets the computed offset points.

Returns:

List<Coordinate>

extractPoints

private void extractPoints(LineString line,
                           double offsetDistance,
                           java.util.List offsetPts)

computeOffsetPoints

private void computeOffsetPoints(Coordinate p0,
                                 Coordinate p1,
                                 double offsetDistance,
                                 java.util.List offsetPts)

Generates the two points which are offset from the midpoint of the segment (p0, p1) by the offsetDistance.

Parameters:

p0 - the first point of the segment to offset from

p1 - the second point of the segment to offset from