com.revolsys.jts.noding

Class SegmentIntersectionDetector

java.lang.Object

com.revolsys.jts.noding.SegmentIntersectionDetector

All Implemented Interfaces:

SegmentIntersector

public class SegmentIntersectionDetector
extends Object
implements SegmentIntersector

Detects and records an intersection between two SegmentStrings, if one exists. Only a single intersection is recorded. This strategy can be configured to search for proper intersections>/b>. In this case, the presence of any kind of intersection will still be recorded, but searching will continue until either a proper intersection has been found or no intersections are detected.

Version:

1.7

Constructor Summary

Constructors

Constructor and Description
SegmentIntersectionDetector() Creates an intersection finder using a RobustLineIntersector.
SegmentIntersectionDetector(LineIntersector li) Creates an intersection finder using a given LineIntersector.

Method Summary

Methods

Modifier and Type	Method and Description
Point	getIntersection() Gets the computed location of the intersection.
Point[]	getIntersectionSegments() Gets the endpoints of the intersecting segments.
boolean	hasIntersection() Tests whether an intersection was found.
boolean	hasNonProperIntersection() Tests whether a non-proper intersection was found.
boolean	hasProperIntersection() Tests whether a proper intersection was found.
boolean	isDone() Tests whether processing can terminate, because all required information has been obtained (e.g.
void	processIntersections(SegmentString e0, int segIndex0, SegmentString e1, int segIndex1) This method is called by clients of the SegmentIntersector class to process intersections for two segments of the SegmentStrings being intersected.
void	setFindAllIntersectionTypes(boolean findAllTypes) Sets whether processing can terminate once any intersection is found.
void	setFindProper(boolean findProper) Sets whether processing must continue until a proper intersection is found.

Methods inherited from class java.lang.Object

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

Constructor Detail

SegmentIntersectionDetector

public SegmentIntersectionDetector()

Creates an intersection finder using a RobustLineIntersector.

SegmentIntersectionDetector

public SegmentIntersectionDetector(LineIntersector li)

Creates an intersection finder using a given LineIntersector.

Parameters:

li - the LineIntersector to use

Method Detail

getIntersection

public Point getIntersection()

Gets the computed location of the intersection. Due to round-off, the location may not be exact.

Returns:

the coordinate for the intersection location

getIntersectionSegments

public Point[] getIntersectionSegments()

Gets the endpoints of the intersecting segments.

Returns:

an array of the segment endpoints (p00, p01, p10, p11)

hasIntersection

public boolean hasIntersection()

Tests whether an intersection was found.

Returns:

true if an intersection was found

hasNonProperIntersection

public boolean hasNonProperIntersection()

Tests whether a non-proper intersection was found.

Returns:

true if a non-proper intersection was found

hasProperIntersection

public boolean hasProperIntersection()

Tests whether a proper intersection was found.

Returns:

true if a proper intersection was found

isDone

public boolean isDone()

Tests whether processing can terminate, because all required information has been obtained (e.g. an intersection of the desired type has been detected).

Specified by:

isDone in interface SegmentIntersector

Returns:

true if processing can terminate

processIntersections

public void processIntersections(SegmentString e0,
                        int segIndex0,
                        SegmentString e1,
                        int segIndex1)

This method is called by clients of the SegmentIntersector class to process intersections for two segments of the SegmentStrings being intersected. Note that some clients (such as MonotoneChains) may optimize away this call for segment pairs which they have determined do not intersect (e.g. by an disjoint envelope test).

Specified by:

processIntersections in interface SegmentIntersector

setFindAllIntersectionTypes

public void setFindAllIntersectionTypes(boolean findAllTypes)

Sets whether processing can terminate once any intersection is found.

Parameters:

findAllTypes - true if processing can terminate once any intersection is found.

setFindProper

public void setFindProper(boolean findProper)

Sets whether processing must continue until a proper intersection is found.

Parameters:

findProper - true if processing should continue until a proper intersection is found