org.locationtech.jts.operation.overlay

Class PointBuilder

java.lang.Object

org.locationtech.jts.operation.overlay.PointBuilder

public class PointBuilder
extends java.lang.Object

Constructs Points from the nodes of an overlay graph.

Version:

1.7

Field Summary

Fields

Modifier and Type	Field and Description
private GeometryFactory	geometryFactory
private OverlayOp	op
private java.util.List	resultPointList

Constructor Summary

Constructors

Constructor and Description
PointBuilder(OverlayOp op, GeometryFactory geometryFactory, PointLocator ptLocator)

Method Summary

Modifier and Type	Method and Description
java.util.List	build(int opCode) Computes the Point geometries which will appear in the result, given the specified overlay operation.
private void	extractNonCoveredResultNodes(int opCode) Determines nodes which are in the result, and creates Points for them.
private void	filterCoveredNodeToPoint(Node n) Converts non-covered nodes to Point objects and adds them to the result.

Methods inherited from class java.lang.Object

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

Field Detail

op

private OverlayOp op

geometryFactory

private GeometryFactory geometryFactory

resultPointList

private java.util.List resultPointList

Constructor Detail

PointBuilder

public PointBuilder(OverlayOp op,
                    GeometryFactory geometryFactory,
                    PointLocator ptLocator)

Method Detail

build

public java.util.List build(int opCode)

Computes the Point geometries which will appear in the result, given the specified overlay operation.

Returns:

a list of the Points objects in the result

extractNonCoveredResultNodes

private void extractNonCoveredResultNodes(int opCode)

Determines nodes which are in the result, and creates Points for them. This method determines nodes which are candidates for the result via their labelling and their graph topology.

Parameters:

opCode - the overlay operation

filterCoveredNodeToPoint

private void filterCoveredNodeToPoint(Node n)

Converts non-covered nodes to Point objects and adds them to the result. A node is covered if it is contained in another element Geometry with higher dimension (e.g. a node point might be contained in a polygon, in which case the point can be eliminated from the result).

Parameters:

n - the node to test