com.revolsys.jts.geomgraph

Class Edge

java.lang.Object

com.revolsys.jts.geomgraph.GraphComponent

com.revolsys.jts.geomgraph.Edge

public class Edge
extends GraphComponent

Version:

1.7

Field Summary

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

label

Constructor Summary

Constructors

Constructor and Description
Edge(LineString points)
Edge(LineString points, Label label)

Method Summary

Methods

Modifier and Type	Method and Description
void	addIntersection(LineIntersector li, int segmentIndex, int geomIndex, int intIndex) Add an EdgeIntersection for intersection intIndex.
void	addIntersections(LineIntersector li, int segmentIndex, int geomIndex) Adds EdgeIntersections for one or both intersections found for a segment of an edge to the edge intersection list.
void	computeIM(IntersectionMatrix im) Update the IM with the contribution for this component.
boolean	equals(Object o) equals is defined to be:
Edge	getCollapsedEdge()
Point	getCoordinate()
Point	getCoordinate(int i)
Depth	getDepth()
int	getDepthDelta() The depthDelta is the change in depth as an edge is crossed from R to L
EdgeIntersectionList	getEdgeIntersectionList()
BoundingBox	getEnvelope()
int	getMaximumSegmentIndex()
MonotoneChainEdge	getMonotoneChainEdge()
int	getNumPoints()
LineString	getPoints()
boolean	isClosed()
boolean	isCollapsed() An Edge is collapsed if it is an Area edge and it consists of two segments which are equal and opposite (eg a zero-width V).
boolean	isIsolated() An isolated component is one that does not intersect or touch any other component.
boolean	isPointwiseEqual(Edge e)
void	setDepthDelta(int depthDelta)
void	setIsolated(boolean isIsolated)
void	setName(String name)
String	toString()
static void	updateIM(Label label, IntersectionMatrix im) Updates an IM from the label for an edge.

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

getLabel, isCovered, isCoveredSet, isInResult, isVisited, setCovered, setInResult, setLabel, setVisited, updateIM

Methods inherited from class java.lang.Object

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

Constructor Detail

Edge

public Edge(LineString points)

Edge

public Edge(LineString points,
    Label label)

Method Detail

updateIM

public static void updateIM(Label label,
            IntersectionMatrix im)

Updates an IM from the label for an edge. Handles edges from both L and A geometries.

addIntersection

public void addIntersection(LineIntersector li,
                   int segmentIndex,
                   int geomIndex,
                   int intIndex)

Add an EdgeIntersection for intersection intIndex. An intersection that falls exactly on a vertex of the edge is normalized to use the higher of the two possible segmentIndexes

addIntersections

public void addIntersections(LineIntersector li,
                    int segmentIndex,
                    int geomIndex)

Adds EdgeIntersections for one or both intersections found for a segment of an edge to the edge intersection list.

computeIM

public void computeIM(IntersectionMatrix im)

Update the IM with the contribution for this component. A component only contributes if it has a labelling for both parent geometries

Specified by:

computeIM in class GraphComponent

equals

public boolean equals(Object o)

equals is defined to be:

e1 equals e2 iff the coordinates of e1 are the same or the reverse of the coordinates in e2

Overrides:

equals in class Object

getCollapsedEdge

public Edge getCollapsedEdge()

getCoordinate

public Point getCoordinate()

Specified by:

getCoordinate in class GraphComponent

Returns:

a coordinate in this component (or null, if there are none)

getCoordinate

public Point getCoordinate(int i)

getDepth

public Depth getDepth()

getDepthDelta

public int getDepthDelta()

The depthDelta is the change in depth as an edge is crossed from R to L

Returns:

the change in depth as the edge is crossed from R to L

getEdgeIntersectionList

public EdgeIntersectionList getEdgeIntersectionList()

getEnvelope

public BoundingBox getEnvelope()

getMaximumSegmentIndex

public int getMaximumSegmentIndex()

getMonotoneChainEdge

public MonotoneChainEdge getMonotoneChainEdge()

getNumPoints

public int getNumPoints()

getPoints

public LineString getPoints()

isClosed

public boolean isClosed()

isCollapsed

public boolean isCollapsed()

An Edge is collapsed if it is an Area edge and it consists of two segments which are equal and opposite (eg a zero-width V).

isIsolated

public boolean isIsolated()

Description copied from class: GraphComponent

An isolated component is one that does not intersect or touch any other component. This is the case if the label has valid locations for only a single Geometry.

Specified by:

isIsolated in class GraphComponent

Returns:

true if this component is isolated

isPointwiseEqual

public boolean isPointwiseEqual(Edge e)

Returns:

true if the coordinate sequences of the Edges are identical

setDepthDelta

public void setDepthDelta(int depthDelta)

setIsolated

public void setIsolated(boolean isIsolated)

setName

public void setName(String name)

toString

public String toString()

Overrides:

toString in class Object