com.vividsolutions.jts.geomgraph

Class EdgeRing

java.lang.Object

com.vividsolutions.jts.geomgraph.EdgeRing

Direct Known Subclasses:

MaximalEdgeRing, MinimalEdgeRing

public abstract class EdgeRing
extends Object

Version:

1.7

Field Summary

Fields

Modifier and Type	Field and Description
protected GeometryFactory	geometryFactory
protected DirectedEdge	startDe

Constructor Summary

Constructors

Constructor and Description
EdgeRing(DirectedEdge start, GeometryFactory geometryFactory)

Method Summary

Modifier and Type	Method and Description
void	addHole(EdgeRing ring)
protected void	addPoints(Edge edge, boolean isForward, boolean isFirstEdge)
protected void	computePoints(DirectedEdge start) Collect all the points from the DirectedEdges of this ring into a contiguous list
void	computeRing() Compute a LinearRing from the point list previously collected.
boolean	containsPoint(Coordinate p) This method will cause the ring to be computed.
Coordinate	getCoordinate(int i)
List	getEdges() Returns the list of DirectedEdges that make up this EdgeRing
Label	getLabel()
LinearRing	getLinearRing()
int	getMaxNodeDegree()
abstract DirectedEdge	getNext(DirectedEdge de)
EdgeRing	getShell()
boolean	isHole()
boolean	isIsolated()
boolean	isShell()
protected void	mergeLabel(Label deLabel)
protected void	mergeLabel(Label deLabel, int geomIndex) Merge the RHS label from a DirectedEdge into the label for this EdgeRing.
abstract void	setEdgeRing(DirectedEdge de, EdgeRing er)
void	setInResult()
void	setShell(EdgeRing shell)
Polygon	toPolygon(GeometryFactory geometryFactory)

Methods inherited from class java.lang.Object

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

Field Detail

startDe

protected DirectedEdge startDe

geometryFactory

protected GeometryFactory geometryFactory

Constructor Detail

EdgeRing

public EdgeRing(DirectedEdge start,
                GeometryFactory geometryFactory)

Method Detail

isIsolated

public boolean isIsolated()

isHole

public boolean isHole()

getCoordinate

public Coordinate getCoordinate(int i)

getLinearRing

public LinearRing getLinearRing()

getLabel

public Label getLabel()

isShell

public boolean isShell()

getShell

public EdgeRing getShell()

setShell

public void setShell(EdgeRing shell)

addHole

public void addHole(EdgeRing ring)

toPolygon

public Polygon toPolygon(GeometryFactory geometryFactory)

computeRing

public void computeRing()

Compute a LinearRing from the point list previously collected. Test if the ring is a hole (i.e. if it is CCW) and set the hole flag accordingly.

getNext

public abstract DirectedEdge getNext(DirectedEdge de)

setEdgeRing

public abstract void setEdgeRing(DirectedEdge de,
                                 EdgeRing er)

getEdges

public List getEdges()

Returns the list of DirectedEdges that make up this EdgeRing

computePoints

protected void computePoints(DirectedEdge start)

Collect all the points from the DirectedEdges of this ring into a contiguous list

getMaxNodeDegree

public int getMaxNodeDegree()

setInResult

public void setInResult()

mergeLabel

protected void mergeLabel(Label deLabel)

mergeLabel

protected void mergeLabel(Label deLabel,
                          int geomIndex)

Merge the RHS label from a DirectedEdge into the label for this EdgeRing. The DirectedEdge label may be null. This is acceptable - it results from a node which is NOT an intersection node between the Geometries (e.g. the end node of a LinearRing). In this case the DirectedEdge label does not contribute any information to the overall labelling, and is simply skipped.

addPoints

protected void addPoints(Edge edge,
                         boolean isForward,
                         boolean isFirstEdge)

containsPoint

public boolean containsPoint(Coordinate p)

This method will cause the ring to be computed. It will also check any holes, if they have been assigned.