QGIS API Documentation  3.21.0-Master (5b68dc587e)
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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. More...
 
 QgsSpatialIndexKDBush (const QgsSpatialIndexKDBush &other)
 Copy constructor. More...
 
 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. More...
 
 QgsSpatialIndexKDBush (QgsFeatureIterator &fi, QgsFeedback *feedback=nullptr)
 Constructor - creates KDBush index and bulk loads it with features from the iterator. More...
 
 ~QgsSpatialIndexKDBush ()
 
QList< QgsSpatialIndexKDBushDataintersects (const QgsRectangle &rectangle) const
 Returns the list of features which fall within the specified rectangle. More...
 
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. More...
 
QgsSpatialIndexKDBushoperator= (const QgsSpatialIndexKDBush &other)
 Assignment operator. More...
 
qgssize size () const
 Returns the size of the index, i.e. More...
 
QList< QgsSpatialIndexKDBushDatawithin (const QgsPointXY &point, double radius) const
 Returns the list of features which are within the given search radius of point. More...
 
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. More...
 

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:

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)

Copy constructor.

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)

Assignment operator.

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 Function Documentation

◆ TestQgsSpatialIndexKdBush

friend class TestQgsSpatialIndexKdBush
friend

Definition at line 146 of file qgsspatialindexkdbush.h.


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