QgsSpatialIndexKDBush Class Reference

A very fast static spatial index for 2D points based on a flat KD-tree. More...

#include <qgsspatialindexkdbush.h>

Public Member Functions
	QgsSpatialIndexKDBush (const QgsFeatureSource &source, QgsFeedback *feedback=nullptr)
	Constructor - creates KDBush index and bulk loads it with features from the source.
	QgsSpatialIndexKDBush (const QgsSpatialIndexKDBush &other)
	QgsSpatialIndexKDBush (QgsFeatureIterator &fi, const std::function< bool(const QgsFeature &) > &callback, QgsFeedback *feedback=nullptr)
	Constructor - creates KDBush index and bulk loads it with features from the source.
	QgsSpatialIndexKDBush (QgsFeatureIterator &fi, QgsFeedback *feedback=nullptr)
	Constructor - creates KDBush index and bulk loads it with features from the iterator.
	~QgsSpatialIndexKDBush ()
QList< QgsSpatialIndexKDBushData >	intersects (const QgsRectangle &rectangle) const
	Returns the list of features which fall within the specified rectangle.
void	intersects (const QgsRectangle &rectangle, const std::function< void(QgsSpatialIndexKDBushData)> &visitor) const
	Calls a visitor function for all features which fall within the specified rectangle.
QgsSpatialIndexKDBush &	operator= (const QgsSpatialIndexKDBush &other)
qgssize	size () const
	Returns the size of the index, i.e.
QList< QgsSpatialIndexKDBushData >	within (const QgsPointXY &point, double radius) const
	Returns the list of features which are within the given search radius of point.
void	within (const QgsPointXY &point, double radius, const std::function< void(QgsSpatialIndexKDBushData)> &visitor)
	Calls a visitor function for all features which are within the given search radius of point.

Friends
class	TestQgsSpatialIndexKdBush

Detailed Description

A very fast static spatial index for 2D points based on a flat KD-tree.

Compared to QgsSpatialIndex, this index:

• supports single point features only (no multipoints)
• is static (features cannot be added or removed from the index after construction)
• is much faster!
• allows direct retrieval of the original feature's points, without requiring additional feature requests
• supports true "distance based" searches, i.e. return all points within a radius from a search point

QgsSpatialIndexKDBush objects are implicitly shared and can be inexpensively copied.

See also

QgsSpatialIndex, which is an general, mutable index for geometry bounding boxes.

Since

QGIS 3.4

Definition at line 54 of file qgsspatialindexkdbush.h.

Constructor & Destructor Documentation

QgsSpatialIndexKDBush() [1/4]

QgsSpatialIndexKDBush::QgsSpatialIndexKDBush ( QgsFeatureIterator &  fi, QgsFeedback *  feedback = nullptr  )

explicit

Constructor - creates KDBush index and bulk loads it with features from the iterator.

The optional feedback object can be used to allow cancellation of bulk feature loading. Ownership of feedback is not transferred, and callers must take care that the lifetime of feedback exceeds that of the spatial index construction.

Any non-single point features encountered during iteration will be ignored and not included in the index.

Definition at line 24 of file qgsspatialindexkdbush.cpp.

QgsSpatialIndexKDBush() [2/4]

QgsSpatialIndexKDBush::QgsSpatialIndexKDBush ( const QgsFeatureSource &  source, QgsFeedback *  feedback = nullptr  )

explicit

Constructor - creates KDBush index and bulk loads it with features from the source.

The optional feedback object can be used to allow cancellation of bulk feature loading. Ownership of feedback is not transferred, and callers must take care that the lifetime of feedback exceeds that of the spatial index construction.

Any non-single point features encountered during iteration will be ignored and not included in the index.

Definition at line 30 of file qgsspatialindexkdbush.cpp.

QgsSpatialIndexKDBush() [3/4]

QgsSpatialIndexKDBush::QgsSpatialIndexKDBush ( QgsFeatureIterator &  fi, const std::function< bool(const QgsFeature &) > &  callback, QgsFeedback *  feedback = nullptr  )

explicit

Constructor - creates KDBush index and bulk loads it with features from the source.

This constructor allows for a callback function to be specified, which is called for each added feature in turn. It allows for bulk spatial index load along with other feature based operations on a single iteration through a feature source. If callback returns false, the load and iteration is canceled.

The optional feedback object can be used to allow cancellation of bulk feature loading. Ownership of feedback is not transferred, and callers must take care that the lifetime of feedback exceeds that of the spatial index construction.

Any non-single point features encountered during iteration will be ignored and not included in the index.

Note

Not available in Python bindings

Since

QGIS 3.22

QgsSpatialIndexKDBush() [4/4]

QgsSpatialIndexKDBush::QgsSpatialIndexKDBush

(

const QgsSpatialIndexKDBush &

other

)

Definition at line 42 of file qgsspatialindexkdbush.cpp.

~QgsSpatialIndexKDBush()

QgsSpatialIndexKDBush::~QgsSpatialIndexKDBush

(

)

Definition at line 62 of file qgsspatialindexkdbush.cpp.

Member Function Documentation

intersects() [1/2]

QList< QgsSpatialIndexKDBushData > QgsSpatialIndexKDBush::intersects

(

const QgsRectangle &

rectangle

)

const

Returns the list of features which fall within the specified rectangle.

Definition at line 85 of file qgsspatialindexkdbush.cpp.

intersects() [2/2]

void QgsSpatialIndexKDBush::intersects	(	const QgsRectangle &	rectangle,
		const std::function< void(QgsSpatialIndexKDBushData)> &	visitor
	)		const

Calls a visitor function for all features which fall within the specified rectangle.

Note

Not available in Python bindings

Definition at line 95 of file qgsspatialindexkdbush.cpp.

operator=()

QgsSpatialIndexKDBush & QgsSpatialIndexKDBush::operator=

(

const QgsSpatialIndexKDBush &

other

)

Definition at line 47 of file qgsspatialindexkdbush.cpp.

size()

qgssize QgsSpatialIndexKDBush::size

(

)

const

Returns the size of the index, i.e.

the number of points contained within the index.

Definition at line 80 of file qgsspatialindexkdbush.cpp.

within() [1/2]

QList< QgsSpatialIndexKDBushData > QgsSpatialIndexKDBush::within	(	const QgsPointXY &	point,
		double	radius
	)		const

Returns the list of features which are within the given search radius of point.

Definition at line 68 of file qgsspatialindexkdbush.cpp.

within() [2/2]

void QgsSpatialIndexKDBush::within	(	const QgsPointXY &	point,
		double	radius,
		const std::function< void(QgsSpatialIndexKDBushData)> &	visitor
	)

Calls a visitor function for all features which are within the given search radius of point.

Note

Not available in Python bindings

Definition at line 75 of file qgsspatialindexkdbush.cpp.

Friends And Related Symbol Documentation

TestQgsSpatialIndexKdBush

friend class TestQgsSpatialIndexKdBush

friend

Definition at line 143 of file qgsspatialindexkdbush.h.

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

• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/qgsspatialindexkdbush.h
• /build/qgis-3.41.0+git20241214+cea29feecf2+99sid/src/core/qgsspatialindexkdbush.cpp