Contains utility functions for editing vector layers. More...

#include <qgsvectorlayereditutils.h>

Public Member Functions
	QgsVectorLayerEditUtils (QgsVectorLayer *layer)

Qgis::GeometryOperationResult	addPart (const QgsPointSequence &ring, QgsFeatureId featureId)
	Adds a new part polygon to a multipart feature.

Q_DECL_DEPRECATED Qgis::GeometryOperationResult	addPart (const QVector< QgsPointXY > &ring, QgsFeatureId featureId)
	Adds a new part polygon to a multipart feature.

Qgis::GeometryOperationResult	addPart (QgsCurve *ring, QgsFeatureId featureId)
	Adds a new part polygon to a multipart feature.

Qgis::GeometryOperationResult	addRing (const QgsPointSequence &ring, const QgsFeatureIds &targetFeatureIds=QgsFeatureIds(), QgsFeatureId *modifiedFeatureId=nullptr)
	Adds a ring to polygon/multipolygon features.

Q_DECL_DEPRECATED Qgis::GeometryOperationResult	addRing (const QVector< QgsPointXY > &ring, const QgsFeatureIds &targetFeatureIds=QgsFeatureIds(), QgsFeatureId *modifiedFeatureId=nullptr)
	Adds a ring to polygon/multipolygon features.

Qgis::GeometryOperationResult	addRing (QgsCurve ring, const QgsFeatureIds &targetFeatureIds=QgsFeatureIds(), QgsFeatureId modifiedFeatureId=nullptr)
	Adds a ring to polygon/multipolygon features.

Qgis::GeometryOperationResult	addRingV2 (QgsCurve ring, const QgsFeatureIds &targetFeatureIds=QgsFeatureIds(), QgsFeatureIds modifiedFeatureIds=nullptr)
	Adds a ring to polygon/multipolygon features.

int	addTopologicalPoints (const QgsGeometry &geom)
	Adds topological points for every vertex of the geometry.

int	addTopologicalPoints (const QgsPoint &p)
	Adds a vertex to segments which intersect point p but don't already have a vertex there.

int	addTopologicalPoints (const QgsPointSequence &ps)
	Adds a vertex to segments which intersect point p but don't already have a vertex there.

int	addTopologicalPoints (const QgsPointXY &p)
	Adds a vertex to segments which intersect point p but don't already have a vertex there.

Qgis::VectorEditResult	deleteVertex (QgsFeatureId featureId, int vertex)
	Deletes a vertex from a feature.

bool	insertVertex (const QgsPoint &point, QgsFeatureId atFeatureId, int beforeVertex)
	Inserts a new vertex before the given vertex number, in the given ring, item (first number is index 0), and feature Not meaningful for Point geometries.

bool	insertVertex (double x, double y, QgsFeatureId atFeatureId, int beforeVertex)
	Insert a new vertex before the given vertex number, in the given ring, item (first number is index 0), and feature Not meaningful for Point geometries.

bool	mergeFeatures (const QgsFeatureId &targetFeatureId, const QgsFeatureIds &mergeFeatureIds, const QgsAttributes &mergeAttributes, const QgsGeometry &unionGeometry, QString &errorMessage)
	Merge features into a single one.

bool	moveVertex (const QgsPoint &p, QgsFeatureId atFeatureId, int atVertex)
	Moves the vertex at the given position number, ring and item (first number is index 0), and feature to the given coordinates.

bool	moveVertex (double x, double y, QgsFeatureId atFeatureId, int atVertex)
	Moves the vertex at the given position number, ring and item (first number is index 0), and feature to the given coordinates.

Qgis::GeometryOperationResult	splitFeatures (const QgsCurve *curve, QgsPointSequence &topologyTestPoints, bool preserveCircular=false, bool topologicalEditing=false)
	Splits features cut by the given curve.

Qgis::GeometryOperationResult	splitFeatures (const QgsPointSequence &splitLine, bool topologicalEditing=false)
	Splits features cut by the given line.

Q_DECL_DEPRECATED Qgis::GeometryOperationResult	splitFeatures (const QVector< QgsPointXY > &splitLine, bool topologicalEditing=false)
	Splits features cut by the given line.

Qgis::GeometryOperationResult	splitParts (const QgsPointSequence &splitLine, bool topologicalEditing=false)
	Splits parts cut by the given line.

Q_DECL_DEPRECATED Qgis::GeometryOperationResult	splitParts (const QVector< QgsPointXY > &splitLine, bool topologicalEditing=false)
	Splits parts cut by the given line.

int	translateFeature (QgsFeatureId featureId, double dx, double dy)
	Translates feature by dx, dy.

Detailed Description

Contains utility functions for editing vector layers.

Definition at line 32 of file qgsvectorlayereditutils.h.

Constructor & Destructor Documentation

◆ QgsVectorLayerEditUtils()

QgsVectorLayerEditUtils::QgsVectorLayerEditUtils ( QgsVectorLayer * layer )

Definition at line 36 of file qgsvectorlayereditutils.cpp.

Member Function Documentation

◆ addPart() [1/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addPart	(	const QgsPointSequence &	ring,
		QgsFeatureId	featureId
	)

Adds a new part polygon to a multipart feature.

Returns: - QgsGeometry::Success

QgsGeometry::AddPartSelectedGeometryNotFound
QgsGeometry::AddPartNotMultiGeometry
QgsGeometry::InvalidBaseGeometry
QgsGeometry::InvalidInput

Note: available in python bindings as addPartV2

Definition at line 262 of file qgsvectorlayereditutils.cpp.

◆ addPart() [2/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addPart	(	const QVector< QgsPointXY > &	ring,
		QgsFeatureId	featureId
	)

Adds a new part polygon to a multipart feature.

Returns: - QgsGeometry::Success

QgsGeometry::AddPartSelectedGeometryNotFound
QgsGeometry::AddPartNotMultiGeometry
QgsGeometry::InvalidBaseGeometry
QgsGeometry::InvalidInput

Deprecated:
QGIS 3.12. Will be removed in QGIS 4.0. Use the variant which accepts QgsPoint objects instead of QgsPointXY.

Definition at line 252 of file qgsvectorlayereditutils.cpp.

◆ addPart() [3/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addPart	(	QgsCurve *	ring,
		QgsFeatureId	featureId
	)

Adds a new part polygon to a multipart feature.

Returns: - QgsGeometry::Success

QgsGeometry::AddPartSelectedGeometryNotFound
QgsGeometry::AddPartNotMultiGeometry
QgsGeometry::InvalidBaseGeometry
QgsGeometry::InvalidInput

Note: available in python bindings as addCurvedPart

Definition at line 297 of file qgsvectorlayereditutils.cpp.

◆ addRing() [1/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addRing	(	const QgsPointSequence &	ring,
		const QgsFeatureIds &	targetFeatureIds = `QgsFeatureIds()`,
		QgsFeatureId *	modifiedFeatureId = `nullptr`
	)

Adds a ring to polygon/multipolygon features.

Parameters

ring	ring to add
targetFeatureIds	if specified, only these features will be the candidates for adding a ring. Otherwise all intersecting features are tested and the ring is added to the first valid feature.
modifiedFeatureId	if specified, feature ID for feature that ring was added to will be stored in this parameter

Returns: OperationResult result code: success or reason of failure

Definition at line 224 of file qgsvectorlayereditutils.cpp.

◆ addRing() [2/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addRing	(	const QVector< QgsPointXY > &	ring,
		const QgsFeatureIds &	targetFeatureIds = `QgsFeatureIds()`,
		QgsFeatureId *	modifiedFeatureId = `nullptr`
	)

Adds a ring to polygon/multipolygon features.

Parameters

ring	ring to add
targetFeatureIds	if specified, only these features will be the candidates for adding a ring. Otherwise all intersecting features are tested and the ring is added to the first valid feature.
modifiedFeatureId	if specified, feature ID for feature that ring was added to will be stored in this parameter

Returns: OperationResult result code: success or reason of failure

Deprecated:: QGIS 3.12. Will be removed in QGIS 4.0. Use the variant which accepts QgsPoint objects instead of QgsPointXY.

Definition at line 214 of file qgsvectorlayereditutils.cpp.

◆ addRing() [3/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addRing	(	QgsCurve *	ring,
		const QgsFeatureIds &	targetFeatureIds = `QgsFeatureIds()`,
		QgsFeatureId *	modifiedFeatureId = `nullptr`
	)

Adds a ring to polygon/multipolygon features.

Parameters

ring	ring to add
targetFeatureIds	if specified, only these features will be the candidates for adding a ring. Otherwise all intersecting features are tested and the ring is added to the first valid feature.
modifiedFeatureId	if specified, feature ID for feature that ring was added to will be stored in this parameter

Returns: OperationResult result code: success or reason of failure

Note: available in python bindings as addCurvedRing

Definition at line 230 of file qgsvectorlayereditutils.cpp.

◆ addRingV2()

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::addRingV2	(	QgsCurve *	ring,
		const QgsFeatureIds &	targetFeatureIds = `QgsFeatureIds()`,
		QgsFeatureIds *	modifiedFeatureIds = `nullptr`
	)

Adds a ring to polygon/multipolygon features.

Parameters

ring	ring to add (ownership is transferred)
targetFeatureIds	if specified, only these features will be the candidates for adding a ring. Otherwise all intersecting features are tested and the ring is added to all valid features.
modifiedFeatureIds	if specified, feature IDS for features that ring was added to will be stored in this parameter

Returns: OperationResult result code: success or reason of failure

Since: QGIS 3.28

Definition at line 243 of file qgsvectorlayereditutils.cpp.

◆ addTopologicalPoints() [1/4]

int QgsVectorLayerEditUtils::addTopologicalPoints ( const QgsGeometry & geom )

Adds topological points for every vertex of the geometry.

Parameters

geom	the geometry where each vertex is added to segments of other features

Returns: 0 in case of success; 1 in case of error; 2 in case no vertices needed to be added

Note: geom is not going to be modified by the function

Definition at line 754 of file qgsvectorlayereditutils.cpp.

◆ addTopologicalPoints() [2/4]

int QgsVectorLayerEditUtils::addTopologicalPoints ( const QgsPoint & p )

Adds a vertex to segments which intersect point p but don't already have a vertex there.

If a feature already has a vertex at position p, no additional vertex is inserted. This method is useful for topological editing.

Returns: 0 in case of success; 1 in case of error; 2 in case no vertices needed to be added

Since: QGIS 3.10

Definition at line 779 of file qgsvectorlayereditutils.cpp.

◆ addTopologicalPoints() [3/4]

int QgsVectorLayerEditUtils::addTopologicalPoints ( const QgsPointSequence & ps )

Adds a vertex to segments which intersect point p but don't already have a vertex there.

If a feature already has a vertex at position p, no additional vertex is inserted. This method is useful for topological editing.

Returns: 0 in case of success; 1 in case of error; 2 in case vertex already exists or point does not intersect segment

Since: QGIS 3.16

Definition at line 826 of file qgsvectorlayereditutils.cpp.

◆ addTopologicalPoints() [4/4]

int QgsVectorLayerEditUtils::addTopologicalPoints ( const QgsPointXY & p )

Adds a vertex to segments which intersect point p but don't already have a vertex there.

If a feature already has a vertex at position p, no additional vertex is inserted. This method is useful for topological editing.

Returns: 0 in case of success; 1 in case of error; 2 in case no vertices needed to be added

Definition at line 851 of file qgsvectorlayereditutils.cpp.

◆ deleteVertex()

Qgis::VectorEditResult QgsVectorLayerEditUtils::deleteVertex	(	QgsFeatureId	featureId,
		int	vertex
	)

Deletes a vertex from a feature.

Parameters

featureId	ID of feature to remove vertex from
vertex	index of vertex to delete

Definition at line 112 of file qgsvectorlayereditutils.cpp.

◆ insertVertex() [1/2]

bool QgsVectorLayerEditUtils::insertVertex	(	const QgsPoint &	point,
		QgsFeatureId	atFeatureId,
		int	beforeVertex
	)

Inserts a new vertex before the given vertex number, in the given ring, item (first number is index 0), and feature Not meaningful for Point geometries.

Definition at line 58 of file qgsvectorlayereditutils.cpp.

◆ insertVertex() [2/2]

bool QgsVectorLayerEditUtils::insertVertex	(	double	x,
		double	y,
		QgsFeatureId	atFeatureId,
		int	beforeVertex
	)

Insert a new vertex before the given vertex number, in the given ring, item (first number is index 0), and feature Not meaningful for Point geometries.

Definition at line 41 of file qgsvectorlayereditutils.cpp.

◆ mergeFeatures()

bool QgsVectorLayerEditUtils::mergeFeatures	(	const QgsFeatureId &	targetFeatureId,
		const QgsFeatureIds &	mergeFeatureIds,
		const QgsAttributes &	mergeAttributes,
		const QgsGeometry &	unionGeometry,
		QString &	errorMessage
	)

Merge features into a single one.

Parameters

targetFeatureId	id of the target feature (will be updated)
mergeFeatureIds	id list of features to merge (will be deleted)
mergeAttributes	are the resulting attributes in the merged feature
unionGeometry	is the resulting geometry of the merged feature
errorMessage	will be set to a descriptive error message if any occurs

Returns: true if the merge was successful, or false if the operation failed.

Since: QGIS 3.30

Definition at line 856 of file qgsvectorlayereditutils.cpp.

◆ moveVertex() [1/2]

bool QgsVectorLayerEditUtils::moveVertex	(	const QgsPoint &	p,
		QgsFeatureId	atFeatureId,
		int	atVertex
	)

Moves the vertex at the given position number, ring and item (first number is index 0), and feature to the given coordinates.

Note: available in Python bindings as moveVertexV2

Definition at line 81 of file qgsvectorlayereditutils.cpp.

◆ moveVertex() [2/2]

bool QgsVectorLayerEditUtils::moveVertex	(	double	x,
		double	y,
		QgsFeatureId	atFeatureId,
		int	atVertex
	)

Moves the vertex at the given position number, ring and item (first number is index 0), and feature to the given coordinates.

Definition at line 75 of file qgsvectorlayereditutils.cpp.

◆ splitFeatures() [1/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::splitFeatures	(	const QgsCurve *	curve,
		QgsPointSequence &	topologyTestPoints,
		bool	preserveCircular = `false`,
		bool	topologicalEditing = `false`
	)

Splits features cut by the given curve.

Parameters

	curve	line that splits the layer features
[out]	topologyTestPoints	topological points to be tested against other layers
	preserveCircular	whether circular strings are preserved after splitting
	topologicalEditing	`true` if topological editing is enabled

Returns: QgsGeometry::OperationResult

Since: QGIS 3.16

Definition at line 376 of file qgsvectorlayereditutils.cpp.

◆ splitFeatures() [2/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::splitFeatures	(	const QgsPointSequence &	splitLine,
		bool	topologicalEditing = `false`
	)

Splits features cut by the given line.

Parameters

splitLine	line that splits the layer features
topologicalEditing	`true` if topological editing is enabled

Returns: QgsGeometry::OperationResult

Definition at line 368 of file qgsvectorlayereditutils.cpp.

◆ splitFeatures() [3/3]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::splitFeatures	(	const QVector< QgsPointXY > &	splitLine,
		bool	topologicalEditing = `false`
	)

Splits features cut by the given line.

Parameters

splitLine	line that splits the layer features
topologicalEditing	`true` if topological editing is enabled

Returns: QgsGeometry::OperationResult

Deprecated:: QGIS 3.12. Will be removed in QGIS 4.0. Use the variant which accepts QgsPoint objects instead of QgsPointXY.

Definition at line 357 of file qgsvectorlayereditutils.cpp.

◆ splitParts() [1/2]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::splitParts	(	const QgsPointSequence &	splitLine,
		bool	topologicalEditing = `false`
	)

Splits parts cut by the given line.

Parameters

splitLine	line that splits the layer feature parts
topologicalEditing	`true` if topological editing is enabled

Returns: - QgsGeometry::InvalidBaseGeometry

QgsGeometry::Success
QgsGeometry::InvalidInput
QgsGeometry::NothingHappened if a selection is present but no feature has been split
QgsGeometry::InvalidBaseGeometry
QgsGeometry::GeometryEngineError
QgsGeometry::SplitCannotSplitPoint

Definition at line 632 of file qgsvectorlayereditutils.cpp.

◆ splitParts() [2/2]

Qgis::GeometryOperationResult QgsVectorLayerEditUtils::splitParts	(	const QVector< QgsPointXY > &	splitLine,
		bool	topologicalEditing = `false`
	)

Splits parts cut by the given line.

Parameters

splitLine	line that splits the layer feature parts
topologicalEditing	`true` if topological editing is enabled

Returns: - QgsGeometry::InvalidBaseGeometry

QgsGeometry::Success
QgsGeometry::InvalidInput
QgsGeometry::NothingHappened if a selection is present but no feature has been split
QgsGeometry::InvalidBaseGeometry
QgsGeometry::GeometryEngineError
QgsGeometry::SplitCannotSplitPoint

Deprecated:
QGIS 3.12. Will be removed in QGIS 4.0. Use the variant which accepts QgsPoint objects instead of QgsPointXY.

Definition at line 622 of file qgsvectorlayereditutils.cpp.

◆ translateFeature()

int QgsVectorLayerEditUtils::translateFeature	(	QgsFeatureId	featureId,
		double	dx,
		double	dy
	)

Translates feature by dx, dy.

Parameters

featureId	id of the feature to translate
dx	translation of x-coordinate
dy	translation of y-coordinate

Returns: 0 in case of success

Definition at line 338 of file qgsvectorlayereditutils.cpp.

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

/build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/core/vector/qgsvectorlayereditutils.h
/build/qgis-3.41.0+git20241122+3440c17df1d+99sid/src/core/vector/qgsvectorlayereditutils.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ QgsVectorLayerEditUtils()

Member Function Documentation

◆ addPart() [1/3]

◆ addPart() [2/3]

◆ addPart() [3/3]

◆ addRing() [1/3]

◆ addRing() [2/3]

◆ addRing() [3/3]

◆ addRingV2()

◆ addTopologicalPoints() [1/4]

◆ addTopologicalPoints() [2/4]

◆ addTopologicalPoints() [3/4]

◆ addTopologicalPoints() [4/4]

◆ deleteVertex()

◆ insertVertex() [1/2]

◆ insertVertex() [2/2]

◆ mergeFeatures()

◆ moveVertex() [1/2]

◆ moveVertex() [2/2]

◆ splitFeatures() [1/3]

◆ splitFeatures() [2/3]

◆ splitFeatures() [3/3]

◆ splitParts() [1/2]

◆ splitParts() [2/2]

◆ translateFeature()