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:
- Interior intersections which lie in the interior of a segment (with another segment interior or with a vertex or endpoint)
- Vertex intersections which occur at vertices in the interior of
SegmentString
s (with a segment string endpoint or with another interior vertex)
setInteriorIntersectionsOnly(boolean)
.By default only the first intersection is found, but all can be found by setting
setFindAllIntersections(boolean)
- Version:
- 1.7
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Constructor Summary
Constructors Constructor Description NodingIntersectionFinder(LineIntersector li)
Creates an intersection finder which finds an 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 a finder which finds all intersections.static NodingIntersectionFinder
createAnyIntersectionFinder(LineIntersector li)
Creates a finder which tests if there is at least one intersection.static NodingIntersectionFinder
createInteriorIntersectionCounter(LineIntersector li)
Creates an finder which counts all interior intersections.static NodingIntersectionFinder
createInteriorIntersectionsFinder(LineIntersector li)
Creates a finder which finds all interior intersections.static NodingIntersectionFinder
createIntersectionCounter(LineIntersector li)
Creates an finder which counts all intersections.Coordinate
getIntersection()
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 intersection.void
setFindAllIntersections(boolean findAllIntersections)
Sets whether all intersections should be computed.void
setInteriorIntersectionsOnly(boolean isInteriorIntersectionsOnly)
Sets whether only interior (proper) intersections will be found.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 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 a finder which tests if there is at least one intersection. Uses short-circuiting for efficient performance. The intersection found is recorded.- Parameters:
li
- a line intersector- Returns:
- a finder which tests if there is at least one intersection.
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createAllIntersectionsFinder
public static NodingIntersectionFinder createAllIntersectionsFinder(LineIntersector li)
Creates a finder which finds all intersections. The intersections are recorded for later inspection.- Parameters:
li
- a line intersector- Returns:
- a finder which finds all intersections.
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createInteriorIntersectionsFinder
public static NodingIntersectionFinder createInteriorIntersectionsFinder(LineIntersector li)
Creates a finder which finds all interior intersections. The intersections are recorded for later inspection.- Parameters:
li
- a line intersector- Returns:
- a finder which finds all interior intersections.
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createIntersectionCounter
public static NodingIntersectionFinder createIntersectionCounter(LineIntersector li)
Creates an finder which counts all intersections. The intersections are note recorded to reduce memory usage.- Parameters:
li
- a line intersector- Returns:
- a finder which counts all intersections.
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createInteriorIntersectionCounter
public static NodingIntersectionFinder createInteriorIntersectionCounter(LineIntersector li)
Creates an finder which counts all interior intersections. The intersections are note recorded to reduce memory usage.- Parameters:
li
- a line intersector- Returns:
- a 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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setInteriorIntersectionsOnly
public void setInteriorIntersectionsOnly(boolean isInteriorIntersectionsOnly)
Sets whether only interior (proper) intersections will be found.- Parameters:
isInteriorIntersectionsOnly
- whether to find only interior intersections
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setCheckEndSegmentsOnly
public void setCheckEndSegmentsOnly(boolean isCheckEndSegmentsOnly)
Sets whether only end segments should be tested for 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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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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hasIntersection
public boolean hasIntersection()
Tests whether an intersection was found.- Returns:
- true if an intersection was found
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getIntersection
public Coordinate 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
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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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