com.revolsys.jts.geomgraph

Class DirectedEdge

java.lang.Object

com.revolsys.jts.geomgraph.EdgeEnd

com.revolsys.jts.geomgraph.DirectedEdge

All Implemented Interfaces:

Comparable

public class DirectedEdge
extends EdgeEnd

Version:

1.7

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	isForward

Fields inherited from class com.revolsys.jts.geomgraph.EdgeEnd

edge

Constructor Summary

Constructors

Constructor and Description
DirectedEdge(Edge edge, boolean isForward)

Method Summary

Methods

Modifier and Type	Method and Description
static int	depthFactor(Location currLocation, Location nextLocation) Computes the factor for the change in depth when moving from one location to another.
int	getDepth(int position)
int	getDepthDelta()
Edge	getEdge()
EdgeRing	getEdgeRing()
EdgeRing	getMinEdgeRing()
DirectedEdge	getNext()
DirectedEdge	getNextMin()
DirectedEdge	getSym() Each Edge gives rise to a pair of symmetric DirectedEdges, in opposite directions.
boolean	isForward()
boolean	isInResult()
boolean	isInteriorAreaEdge() This is an interior Area edge if its label is an Area label for both Geometries and for each Geometry both sides are in the interior.
boolean	isLineEdge() This edge is a line edge if at least one of the labels is a line label any labels which are not line labels have all Locations = EXTERIOR
boolean	isVisited()
void	print(PrintStream out)
void	setDepth(int position, int depthVal)
void	setEdgeDepths(int position, int depth) Set both edge depths.
void	setEdgeRing(EdgeRing edgeRing)
void	setInResult(boolean isInResult)
void	setMinEdgeRing(EdgeRing minEdgeRing)
void	setNext(DirectedEdge next)
void	setNextMin(DirectedEdge nextMin)
void	setSym(DirectedEdge de)
void	setVisited(boolean isVisited)
void	setVisitedEdge(boolean isVisited) setVisitedEdge marks both DirectedEdges attached to a given Edge.

Methods inherited from class com.revolsys.jts.geomgraph.EdgeEnd

compareDirection, compareTo, computeLabel, getCoordinate, getDirectedCoordinate, getDx, getDy, getLabel, getNode, getQuadrant, init, setLabel, setNode, toString

Methods inherited from class java.lang.Object

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

Field Detail

isForward

protected boolean isForward

Constructor Detail

DirectedEdge

public DirectedEdge(Edge edge,
            boolean isForward)

Method Detail

depthFactor

public static int depthFactor(Location currLocation,
              Location nextLocation)

Computes the factor for the change in depth when moving from one location to another. E.g. if crossing from the INTERIOR to the EXTERIOR the depth decreases, so the factor is -1

getDepth

public int getDepth(int position)

getDepthDelta

public int getDepthDelta()

getEdge

public Edge getEdge()

Overrides:

getEdge in class EdgeEnd

getEdgeRing

public EdgeRing getEdgeRing()

getMinEdgeRing

public EdgeRing getMinEdgeRing()

getNext

public DirectedEdge getNext()

getNextMin

public DirectedEdge getNextMin()

getSym

public DirectedEdge getSym()

Each Edge gives rise to a pair of symmetric DirectedEdges, in opposite directions.

Returns:

the DirectedEdge for the same Edge but in the opposite direction

isForward

public boolean isForward()

isInResult

public boolean isInResult()

isInteriorAreaEdge

public boolean isInteriorAreaEdge()

This is an interior Area edge if

• its label is an Area label for both Geometries
• and for each Geometry both sides are in the interior.

Returns:

true if this is an interior Area edge

isLineEdge

public boolean isLineEdge()

This edge is a line edge if

• at least one of the labels is a line label
• any labels which are not line labels have all Locations = EXTERIOR

isVisited

public boolean isVisited()

print

public void print(PrintStream out)

Overrides:

print in class EdgeEnd

setDepth

public void setDepth(int position,
            int depthVal)

setEdgeDepths

public void setEdgeDepths(int position,
                 int depth)

Set both edge depths. One depth for a given side is provided. The other is computed depending on the Location transition and the depthDelta of the edge.

setEdgeRing

public void setEdgeRing(EdgeRing edgeRing)

setInResult

public void setInResult(boolean isInResult)

setMinEdgeRing

public void setMinEdgeRing(EdgeRing minEdgeRing)

setNext

public void setNext(DirectedEdge next)

setNextMin

public void setNextMin(DirectedEdge nextMin)

setSym

public void setSym(DirectedEdge de)

setVisited

public void setVisited(boolean isVisited)

setVisitedEdge

public void setVisitedEdge(boolean isVisited)

setVisitedEdge marks both DirectedEdges attached to a given Edge. This is used for edges corresponding to lines, which will only appear oriented in a single direction in the result.