geos::noding::NodingIntersectionFinder Class Reference

Finds non-noded intersections in a set of SegmentStrings, if any exist. More...

#include <NodingIntersectionFinder.h>

Inheritance diagram for geos::noding::NodingIntersectionFinder:

Public Member Functions
	NodingIntersectionFinder (algorithm::LineIntersector &newLi)
	Creates an intersection finder which finds an interior intersection if one exists.
bool	hasIntersection () const
	Tests whether an intersection was found.
const geom::Coordinate &	getInteriorIntersection () const
	Gets the computed location of the intersection. Due to round-off, the location may not be exact.
size_t	count () const
	Gets the count of intersections found.
void	setCheckEndSegmentsOnly (bool isCESO)
	Sets whether only end segments should be tested for interior intersection.
void	setFindAllIntersections (bool fAI)
	Sets whether all intersections should be computed.
const std::vector< geom::Coordinate > &	getIntersectionSegments () const
	Gets the endpoints of the intersecting segments.
void	processIntersections (SegmentString *e0, std::size_t segIndex0, SegmentString *e1, std::size_t segIndex1) override
	This method is called by clients of the SegmentIntersector class to process intersections for two segments of the SegmentStrings being intersected.
bool	isDone () const override
	Reports whether the client of this class needs to continue testing all intersections in an arrangement.

Detailed Description

Finds non-noded intersections in a set of SegmentStrings, 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

Constructor & Destructor Documentation

NodingIntersectionFinder()

geos::noding::NodingIntersectionFinder::NodingIntersectionFinder ( algorithm::LineIntersector &  newLi )

inline

Creates an intersection finder which finds an interior intersection if one exists.

Parameters

newLi

the LineIntersector to use

Member Function Documentation

count()

size_t geos::noding::NodingIntersectionFinder::count ( ) const

inline

Gets the count of intersections found.

Returns

the intersection count

getInteriorIntersection()

const geom::Coordinate & geos::noding::NodingIntersectionFinder::getInteriorIntersection ( ) const

inline

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()

const std::vector< geom::Coordinate > & geos::noding::NodingIntersectionFinder::getIntersectionSegments ( ) const

inline

Gets the endpoints of the intersecting segments.

Returns

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

hasIntersection()

bool geos::noding::NodingIntersectionFinder::hasIntersection ( ) const

inline

Tests whether an intersection was found.

Returns

true if an intersection was found

isDone()

bool geos::noding::NodingIntersectionFinder::isDone ( ) const

inlineoverridevirtual

Reports whether the client of this class needs to continue testing all intersections in an arrangement.

Returns

true if there is not need to continue testing segments

The default implementation always return false (process all intersections).

Reimplemented from geos::noding::SegmentIntersector.

processIntersections()

void geos::noding::NodingIntersectionFinder::processIntersections ( SegmentString *  e0, std::size_t  segIndex0, SegmentString *  e1, std::size_t  segIndex1  )

overridevirtual

This method is called by clients of the SegmentIntersector class to process intersections for two segments of the SegmentStrings being intersected.

Note

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).

Implements geos::noding::SegmentIntersector.

setCheckEndSegmentsOnly()

void geos::noding::NodingIntersectionFinder::setCheckEndSegmentsOnly ( bool  isCESO )

inline

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

isCESO

whether to test only end segments

setFindAllIntersections()

void geos::noding::NodingIntersectionFinder::setFindAllIntersections ( bool  fAI )

inline

Sets whether all intersections should be computed.

When this is false (the default value) the value of isDone() is true after the first intersection is found.

Default is false.

Parameters

fAI	whether all intersections should be computed

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The documentation for this class was generated from the following file:

• NodingIntersectionFinder.h