org.locationtech.jts.geomgraph

Class Edge

java.lang.Object

org.locationtech.jts.geomgraph.GraphComponent

org.locationtech.jts.geomgraph.Edge

public class Edge
extends GraphComponent

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
Edge(Coordinate[] pts)
Edge(Coordinate[] pts, Label label)

Method Summary

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()
Coordinate	getCoordinate()
Coordinate	getCoordinate(int i)
Coordinate[]	getCoordinates()
Depth	getDepth()
int	getDepthDelta() The depthDelta is the change in depth as an edge is crossed from R to L
EdgeIntersectionList	getEdgeIntersectionList()
Envelope	getEnvelope()
int	getMaximumSegmentIndex()
MonotoneChainEdge	getMonotoneChainEdge()
int	getNumPoints()
int	hashCode()
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) Check if coordinate sequences of the Edges are identical.
void	print(PrintStream out)
void	printReverse(PrintStream out)
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 org.locationtech.jts.geomgraph.GraphComponent

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Edge

public Edge(Coordinate[] pts,
            Label label)

Edge

public Edge(Coordinate[] pts)

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.

Parameters:

label - Label defining position

im - intersection matrix

getNumPoints

public int getNumPoints()

setName

public void setName(String name)

getCoordinates

public Coordinate[] getCoordinates()

getCoordinate

public Coordinate getCoordinate(int i)

getCoordinate

public Coordinate getCoordinate()

Specified by:

getCoordinate in class GraphComponent

Returns:

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

getEnvelope

public Envelope getEnvelope()

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

setDepthDelta

public void setDepthDelta(int depthDelta)

getMaximumSegmentIndex

public int getMaximumSegmentIndex()

getEdgeIntersectionList

public EdgeIntersectionList getEdgeIntersectionList()

getMonotoneChainEdge

public MonotoneChainEdge getMonotoneChainEdge()

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).

Returns:

zero-width V area edge, consisting of two segments which are equal and of oppose orientation

getCollapsedEdge

public Edge getCollapsedEdge()

setIsolated

public void setIsolated(boolean isIsolated)

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

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.

Parameters:

li - Determining number of intersections to add

segmentIndex - Segment index to add

geomIndex - Geometry index to add

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

Parameters:

li - Determining number of intersections to add

segmentIndex - Segment index to add

geomIndex - Geometry index to add

intIndex - intIndex is 0 or 1

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

Parameters:

im - Intersection matrix

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

hashCode

public int hashCode()

Overrides:

hashCode in class Object

isPointwiseEqual

public boolean isPointwiseEqual(Edge e)

Check if coordinate sequences of the Edges are identical.

Parameters:

e - Edge

Returns:

true if the coordinate sequences of the Edges are identical

toString

public String toString()

Overrides:

toString in class Object

print

public void print(PrintStream out)

printReverse

public void printReverse(PrintStream out)