Package org.locationtech.jts.noding
Class NodingIntersectionFinder
- java.lang.Object
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- org.locationtech.jts.noding.NodingIntersectionFinder
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- All Implemented Interfaces:
SegmentIntersector
public class NodingIntersectionFinder extends java.lang.Object implements SegmentIntersector
Finds non-noded intersections in a set ofSegmentString
s, if any exist.Non-noded intersections include:
- intersections which lie in the interior of a segment
- intersections at a vertex in the interior of a
SegmentString
(e.g. with a segment string endpoint or other interior vertex)
- Version:
- 1.7
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Constructor Summary
Constructors Constructor Description NodingIntersectionFinder(LineIntersector li)
Creates an intersection finder which finds an interior intersection if one exists
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
count()
Gets the count of intersections found.static NodingIntersectionFinder
createAllIntersectionsFinder(LineIntersector li)
Creates an intersection finder which finds all interior intersections.static NodingIntersectionFinder
createAnyIntersectionFinder(LineIntersector li)
Creates an intersection finder which tests if there is at least one interior intersection.static NodingIntersectionFinder
createIntersectionCounter(LineIntersector li)
Creates an intersection finder which counts all interior intersections.Coordinate
getInteriorIntersection()
Gets the computed location of the intersection.java.util.List
getIntersections()
Gets the intersections found.Coordinate[]
getIntersectionSegments()
Gets the endpoints of the intersecting segments.boolean
hasIntersection()
Tests whether an intersection was found.boolean
isDone()
Reports whether the client of this class needs to continue testing all intersections in an arrangement.void
processIntersections(SegmentString e0, int segIndex0, SegmentString e1, int segIndex1)
This method is called by clients of theSegmentIntersector
class to process intersections for two segments of theSegmentString
s being intersected.void
setCheckEndSegmentsOnly(boolean isCheckEndSegmentsOnly)
Sets whether only end segments should be tested for interior intersection.void
setFindAllIntersections(boolean findAllIntersections)
Sets whether all intersections should be computed.void
setKeepIntersections(boolean keepIntersections)
Sets whether intersection points are recorded.
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Constructor Detail
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NodingIntersectionFinder
public NodingIntersectionFinder(LineIntersector li)
Creates an intersection finder which finds an interior intersection if one exists- Parameters:
li
- the LineIntersector to use
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Method Detail
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createAnyIntersectionFinder
public static NodingIntersectionFinder createAnyIntersectionFinder(LineIntersector li)
Creates an intersection finder which tests if there is at least one interior intersection. Uses short-circuiting for efficient performance. The intersection found is recorded.- Parameters:
li
- a line intersector- Returns:
- a intersection finder which tests if there is at least one interior intersection.
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createAllIntersectionsFinder
public static NodingIntersectionFinder createAllIntersectionsFinder(LineIntersector li)
Creates an intersection finder which finds all interior intersections. The intersections are recorded for later inspection.- Parameters:
li
- a line intersector- Returns:
- a intersection finder which finds all interior intersections.
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createIntersectionCounter
public static NodingIntersectionFinder createIntersectionCounter(LineIntersector li)
Creates an intersection finder which counts all interior intersections. The intersections are note recorded to reduce memory usage.- Parameters:
li
- a line intersector- Returns:
- a intersection finder which counts all interior intersections.
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setFindAllIntersections
public void setFindAllIntersections(boolean findAllIntersections)
Sets whether all intersections should be computed. When this isfalse
(the default value) the value ofisDone()
istrue
after the first intersection is found.Default is
false
.- Parameters:
findAllIntersections
- whether all intersections should be computed
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setKeepIntersections
public void setKeepIntersections(boolean keepIntersections)
Sets whether intersection points are recorded. If the only need is to count intersection points, this can be set tofalse
.Default is
true
.- Parameters:
keepIntersections
- indicates whether intersections should be recorded
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getIntersections
public java.util.List getIntersections()
Gets the intersections found.- Returns:
- a List of
Coordinate
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count
public int count()
Gets the count of intersections found.- Returns:
- the intersection count
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setCheckEndSegmentsOnly
public void setCheckEndSegmentsOnly(boolean isCheckEndSegmentsOnly)
Sets whether only end segments should be tested for interior intersection. This is a performance optimization that may be used if the segments have been previously noded by an appropriate algorithm. It may be known that any potential noding failures will occur only in end segments.- Parameters:
isCheckEndSegmentsOnly
- whether to test only end segments
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hasIntersection
public boolean hasIntersection()
Tests whether an intersection was found.- Returns:
- true if an intersection was found
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getInteriorIntersection
public Coordinate getInteriorIntersection()
Gets the computed location of the intersection. Due to round-off, the location may not be exact.- Returns:
- the coordinate for the intersection location
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getIntersectionSegments
public Coordinate[] getIntersectionSegments()
Gets the endpoints of the intersecting segments.- Returns:
- an array of the segment endpoints (p00, p01, p10, p11)
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processIntersections
public void processIntersections(SegmentString e0, int segIndex0, SegmentString e1, int segIndex1)
This method is called by clients of theSegmentIntersector
class to process intersections for two segments of theSegmentString
s being intersected. Note that some clients (such asMonotoneChain
s) 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 interfaceSegmentIntersector
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isDone
public boolean isDone()
Description copied from interface:SegmentIntersector
Reports whether the client of this class needs to continue testing all intersections in an arrangement.- Specified by:
isDone
in interfaceSegmentIntersector
- Returns:
- true if there is no need to continue testing segments
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