Multi polygon geometry collection. More...

#include <qgsmultipolygon.h>

Inheritance diagram for QgsMultiPolygon:

[legend]

Public Member Functions
	QgsMultiPolygon ()
	Constructor for an empty multipolygon geometry.

bool	addGeometry (QgsAbstractGeometry *g) override
	Adds a geometry and takes ownership. Returns `true` in case of success.

QDomElement	asGml2 (QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
	Returns a GML2 representation of the geometry.

QDomElement	asGml3 (QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
	Returns a GML3 representation of the geometry.

json	asJsonObject (int precision=17) const override
	Returns a json object representation of the geometry.

QgsAbstractGeometry *	boundary () const override
	Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry).

void	clear () override
	Clears the geometry, ie reset it to a null geometry.

QgsMultiPolygon *	clone () const override
	Clones the geometry by performing a deep copy.

QgsMultiPolygon *	createEmptyWithSameType () const override
	Creates a new geometry with the same class and same WKB type as the original and transfers ownership.

bool	fromWkt (const QString &wkt) override
	Sets the geometry from a WKT string.

QString	geometryType () const override
	Returns a unique string representing the geometry type.

bool	insertGeometry (QgsAbstractGeometry *g, int index) override
	Inserts a geometry before a specified index and takes ownership.

QgsPolygon *	polygonN (int index)
	Returns the polygon with the specified index.

const QgsPolygon *	polygonN (int index) const
	Returns the polygon with the specified index.

QgsMultiSurface *	toCurveType () const override
	Returns the geometry converted to the more generic curve type QgsMultiSurface.

Public Member Functions inherited from QgsMultiSurface
	QgsMultiSurface ()
	Constructor for an empty multisurface geometry.

bool	addGeometry (QgsAbstractGeometry *g) override
	Adds a geometry and takes ownership. Returns `true` in case of success.

QDomElement	asGml2 (QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
	Returns a GML2 representation of the geometry.

QDomElement	asGml3 (QDomDocument &doc, int precision=17, const QString &ns="gml", QgsAbstractGeometry::AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const override
	Returns a GML3 representation of the geometry.

json	asJsonObject (int precision=17) const override
	Returns a json object representation of the geometry.

QgsAbstractGeometry *	boundary () const override
	Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry).

void	clear () override
	Clears the geometry, ie reset it to a null geometry.

QgsMultiSurface *	clone () const override
	Clones the geometry by performing a deep copy.

QgsMultiSurface *	createEmptyWithSameType () const override
	Creates a new geometry with the same class and same WKB type as the original and transfers ownership.

bool	fromWkt (const QString &wkt) override
	Sets the geometry from a WKT string.

QString	geometryType () const override
	Returns a unique string representing the geometry type.

bool	insertGeometry (QgsAbstractGeometry *g, int index) override
	Inserts a geometry before a specified index and takes ownership.

QgsSurface *	surfaceN (int index)
	Returns the surface with the specified index.

const QgsSurface *	surfaceN (int index) const
	Returns the surface with the specified index.

QgsMultiSurface *	toCurveType () const override
	Returns the geometry converted to the more generic curve type.

Public Member Functions inherited from QgsGeometryCollection
	QgsGeometryCollection ()
	Constructor for an empty geometry collection.

	QgsGeometryCollection (const QgsGeometryCollection &c)

	~QgsGeometryCollection () override

bool	addMValue (double mValue=0) override
	Adds a measure to the geometry, initialized to a preset value.

bool	addZValue (double zValue=0) override
	Adds a z-dimension to the geometry, initialized to a preset value.

void	adjacentVertices (QgsVertexId vertex, QgsVertexId &previousVertex, QgsVertexId &nextVertex) const override
	Returns the vertices adjacent to a specified vertex within a geometry.

double	area () const override
	Returns the planar, 2-dimensional area of the geometry.

QString	asKml (int precision=17) const override
	Returns a KML representation of the geometry.

QPainterPath	asQPainterPath () const override
	Returns the geometry represented as a QPainterPath.

QByteArray	asWkb (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override

QString	asWkt (int precision=17) const override
	Returns a WKT representation of the geometry.

QgsBox3D	boundingBox3D () const override
	Returns the 3D bounding box for the geometry.

bool	boundingBoxIntersects (const QgsBox3D &box3d) const override
	Returns `true` if the bounding box of this geometry intersects with a box3d.

double	closestSegment (const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int leftOf=nullptr, double epsilon=4 std::numeric_limits< double >::epsilon()) const override
	Searches for the closest segment of the geometry to a given point.

QgsCoordinateSequence	coordinateSequence () const override
	Retrieves the sequence of geometries, rings and nodes.

bool	deleteVertex (QgsVertexId position) override
	Deletes a vertex within the geometry.

int	dimension () const override
	Returns the inherent dimension of the geometry.

void	draw (QPainter &p) const override
	Draws the geometry using the specified QPainter.

bool	dropMValue () override
	Drops any measure values which exist in the geometry.

bool	dropZValue () override
	Drops any z-dimensions which exist in the geometry.

QgsGeometryCollection *	extractPartsByType (Qgis::WkbType type, bool useFlatType=true) const
	Returns a new QgsGeometryCollection subclass which consists of the parts of this collection which match the specified WKB type.

void	filterVertices (const std::function< bool(const QgsPoint &) > &filter) override
	Filters the vertices from the geometry in place, removing any which do not return `true` for the filter function check.

bool	fromWkb (QgsConstWkbPtr &wkb) override
	Sets the geometry from a WKB string.

bool	fuzzyDistanceEqual (const QgsAbstractGeometry &other, double epsilon=1e-8) const override
	Performs fuzzy distance comparison between this geometry and other using an epsilon.

bool	fuzzyEqual (const QgsAbstractGeometry &other, double epsilon=1e-8) const override
	Performs fuzzy comparison between this geometry and other using an epsilon.

QgsAbstractGeometry *	geometryN (int n)
	Returns a geometry from within the collection.

const QgsAbstractGeometry *	geometryN (int n) const
	Returns a const reference to a geometry from within the collection.

bool	hasCurvedSegments () const override
	Returns `true` if the geometry contains curved segments.

bool	insertVertex (QgsVertexId position, const QgsPoint &vertex) override
	Inserts a vertex into the geometry.

bool	isEmpty () const override
	Returns `true` if the geometry is empty.

bool	isValid (QString &error, Qgis::GeometryValidityFlags flags=Qgis::GeometryValidityFlags()) const override
	Checks validity of the geometry, and returns `true` if the geometry is valid.

double	length () const override
	Returns the planar, 2-dimensional length of the geometry.

bool	moveVertex (QgsVertexId position, const QgsPoint &newPos) override
	Moves a vertex within the geometry.

int	nCoordinates () const override
	Returns the number of nodes contained in the geometry.

bool	nextVertex (QgsVertexId &id, QgsPoint &vertex) const override
	Returns next vertex id and coordinates.

void	normalize () final
	Reorganizes the geometry into a normalized form (or "canonical" form).

int	numGeometries () const
	Returns the number of geometries within the collection.

bool	operator!= (const QgsAbstractGeometry &other) const override

QgsGeometryCollection &	operator= (const QgsGeometryCollection &c)

bool	operator== (const QgsAbstractGeometry &other) const override

int	partCount () const override
	Returns count of parts contained in the geometry.

double	perimeter () const override
	Returns the planar, 2-dimensional perimeter of the geometry.

bool	removeDuplicateNodes (double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false) override
	Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry.

virtual bool	removeGeometry (int nr)
	Removes a geometry from the collection.

void	reserve (int size)
	Attempts to allocate memory for at least size geometries.

int	ringCount (int part=0) const override
	Returns the number of rings of which this geometry is built.

QgsAbstractGeometry *	segmentize (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const override
	Returns a geometry without curves.

double	segmentLength (QgsVertexId startVertex) const override
	Returns the length of the segment of the geometry which begins at startVertex.

const QgsAbstractGeometry *	simplifiedTypeRef () const override
	Returns a reference to the simplest lossless representation of this geometry, e.g.

QgsGeometryCollection *	snappedToGrid (double hSpacing, double vSpacing, double dSpacing=0, double mSpacing=0) const override
	Makes a new geometry with all the points or vertices snapped to the closest point of the grid.

void	swapXy () override
	Swaps the x and y coordinates from the geometry.

void	transform (const QgsCoordinateTransform &ct, Qgis::TransformDirection d=Qgis::TransformDirection::Forward, bool transformZ=false) override
	Transforms the geometry using a coordinate transform.

void	transform (const QTransform &t, double zTranslate=0.0, double zScale=1.0, double mTranslate=0.0, double mScale=1.0) override
	Transforms the x and y components of the geometry using a QTransform object t.

bool	transform (QgsAbstractGeometryTransformer transformer, QgsFeedback feedback=nullptr) override
	Transforms the vertices from the geometry in place, using the specified geometry transformer object.

void	transformVertices (const std::function< QgsPoint(const QgsPoint &) > &transform) override
	Transforms the vertices from the geometry in place, applying the transform function to every vertex.

double	vertexAngle (QgsVertexId vertex) const override
	Returns approximate angle at a vertex.

QgsPoint	vertexAt (QgsVertexId id) const override
	Returns the point corresponding to a specified vertex id.

int	vertexCount (int part=0, int ring=0) const override
	Returns the number of vertices of which this geometry is built.

int	vertexNumberFromVertexId (QgsVertexId id) const override
	Returns the vertex number corresponding to a vertex id.

int	wkbSize (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override
	Returns the length of the QByteArray returned by asWkb()

Public Member Functions inherited from QgsAbstractGeometry
	QgsAbstractGeometry ()=default
	Constructor for QgsAbstractGeometry.

	QgsAbstractGeometry (const QgsAbstractGeometry &geom)

virtual	~QgsAbstractGeometry ()=default

QString	asJson (int precision=17)
	Returns a GeoJSON representation of the geometry as a QString.

virtual QByteArray	asWkb (WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const =0
	Returns a WKB representation of the geometry.

virtual QgsRectangle	boundingBox () const
	Returns the minimal bounding box for the geometry.

virtual bool	boundingBoxIntersects (const QgsRectangle &rectangle) const
	Returns `true` if the bounding box of this geometry intersects with a rectangle.

virtual QgsPoint	centroid () const
	Returns the centroid of the geometry.

virtual int	compareTo (const QgsAbstractGeometry *other) const
	Comparator for sorting of geometry.

const_part_iterator	const_parts_begin () const
	Returns STL-style iterator pointing to the const first part of the geometry.

const_part_iterator	const_parts_end () const
	Returns STL-style iterator pointing to the imaginary const part after the last part of the geometry.

virtual bool	convertTo (Qgis::WkbType type)
	Converts the geometry to a specified type.

bool	is3D () const
	Returns `true` if the geometry is 3D and contains a z-value.

bool	isMeasure () const
	Returns `true` if the geometry contains m values.

QgsAbstractGeometry &	operator= (const QgsAbstractGeometry &geom)

QgsGeometryPartIterator	parts ()
	Returns Java-style iterator for traversal of parts of the geometry.

QgsGeometryConstPartIterator	parts () const
	Returns Java-style iterator for traversal of parts of the geometry.

part_iterator	parts_begin ()
	Returns STL-style iterator pointing to the first part of the geometry.

part_iterator	parts_end ()
	Returns STL-style iterator pointing to the imaginary part after the last part of the geometry.

QgsVertexIterator	vertices () const
	Returns a read-only, Java-style iterator for traversal of vertices of all the geometry, including all geometry parts and rings.

vertex_iterator	vertices_begin () const
	Returns STL-style iterator pointing to the first vertex of the geometry.

vertex_iterator	vertices_end () const
	Returns STL-style iterator pointing to the imaginary vertex after the last vertex of the geometry.

Qgis::WkbType	wkbType () const
	Returns the WKB type of the geometry.

QString	wktTypeStr () const
	Returns the WKT type string of the geometry.

Static Public Member Functions
static const QgsMultiPolygon *	cast (const QgsAbstractGeometry *geom)
	Cast the geom to a QgsMultiPolygonV2.

Static Public Member Functions inherited from QgsMultiSurface
static const QgsMultiSurface *	cast (const QgsAbstractGeometry *geom)
	Cast the geom to a QgsMultiSurface.

Static Public Member Functions inherited from QgsGeometryCollection
static const QgsGeometryCollection *	cast (const QgsAbstractGeometry *geom)
	Cast the geom to a QgsGeometryCollection.

Protected Member Functions
bool	wktOmitChildType () const override
	Returns whether child type names are omitted from Wkt representations of the collection.

Protected Member Functions inherited from QgsGeometryCollection
QgsBox3D	calculateBoundingBox3D () const override
	Calculates the minimal 3D bounding box for the geometry.

int	childCount () const override
	Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e.

QgsAbstractGeometry *	childGeometry (int index) const override
	Returns pointer to child geometry (for geometries with child geometries - i.e.

void	clearCache () const override
	Clears any cached parameters associated with the geometry, e.g., bounding boxes.

int	compareToSameClass (const QgsAbstractGeometry *other) const final
	Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries.

bool	fromCollectionWkt (const QString &wkt, const QVector< QgsAbstractGeometry * > &subtypes, const QString &defaultChildWkbType=QString())
	Reads a collection from a WKT string.

Protected Member Functions inherited from QgsAbstractGeometry
virtual QgsRectangle	calculateBoundingBox () const
	Default calculator for the minimal bounding box for the geometry.

virtual QgsPoint	childPoint (int index) const
	Returns point at index (for geometries without child geometries - i.e.

virtual bool	hasChildGeometries () const
	Returns whether the geometry has any child geometries (`false` for point / curve, `true` otherwise)

void	setZMTypeFromSubGeometry (const QgsAbstractGeometry *subggeom, Qgis::WkbType baseGeomType)
	Updates the geometry type based on whether sub geometries contain z or m values.

int	sortIndex () const
	Returns the sort index for the geometry, used in the compareTo() method to compare geometries of different types.

Additional Inherited Members
Public Types inherited from QgsAbstractGeometry
enum	AxisOrder { XY = 0 , YX }
	Axis order for GML generation. More...

enum	SegmentationToleranceType { MaximumAngle = 0 , MaximumDifference }
	Segmentation tolerance as maximum angle or maximum difference between approximation and circle. More...

enum	WkbFlag { FlagExportTrianglesAsPolygons = 1 << 0 , FlagExportNanAsDoubleMin = 1 << 1 }
	WKB export flags. More...

Protected Attributes inherited from QgsGeometryCollection
QVector< QgsAbstractGeometry * >	mGeometries

Protected Attributes inherited from QgsAbstractGeometry
Qgis::WkbType	mWkbType = Qgis::WkbType::Unknown

Detailed Description

Multi polygon geometry collection.

Definition at line 30 of file qgsmultipolygon.h.

Constructor & Destructor Documentation

◆ QgsMultiPolygon()

QgsMultiPolygon::QgsMultiPolygon ( )

Constructor for an empty multipolygon geometry.

Definition at line 26 of file qgsmultipolygon.cpp.

Member Function Documentation

◆ addGeometry()

bool QgsMultiPolygon::addGeometry ( QgsAbstractGeometry * g )

overridevirtual

Adds a geometry and takes ownership. Returns true in case of success.

Reimplemented from QgsGeometryCollection.

Definition at line 143 of file qgsmultipolygon.cpp.

◆ asGml2()

QDomElement QgsMultiPolygon::asGml2	(	QDomDocument &	doc,
		int	precision = `17`,
		const QString &	ns = `"gml"`,
		QgsAbstractGeometry::AxisOrder	axisOrder = `QgsAbstractGeometry::AxisOrder::XY`
	)		const

overridevirtual

Returns a GML2 representation of the geometry.

Parameters

doc	DOM document
precision	number of decimal places for coordinates
ns	XML namespace
axisOrder	Axis order for generated GML

See also: asWkb(); asWkt(); asGml3(); asJson()

Reimplemented from QgsGeometryCollection.

Definition at line 69 of file qgsmultipolygon.cpp.

◆ asGml3()

QDomElement QgsMultiPolygon::asGml3	(	QDomDocument &	doc,
		int	precision = `17`,
		const QString &	ns = `"gml"`,
		QgsAbstractGeometry::AxisOrder	axisOrder = `QgsAbstractGeometry::AxisOrder::XY`
	)		const

overridevirtual

Returns a GML3 representation of the geometry.

Parameters

doc	DOM document
precision	number of decimal places for coordinates
ns	XML namespace
axisOrder	Axis order for generated GML

See also: asWkb(); asWkt(); asGml2(); asJson()

Reimplemented from QgsGeometryCollection.

Definition at line 90 of file qgsmultipolygon.cpp.

◆ asJsonObject()

json QgsMultiPolygon::asJsonObject ( int precision = 17 ) const

overridevirtual

Returns a json object representation of the geometry.

See also: asWkb(); asWkt(); asGml2(); asGml3(); asJson()

Note: not available in Python bindings

Since: QGIS 3.10

Reimplemented from QgsGeometryCollection.

Definition at line 110 of file qgsmultipolygon.cpp.

◆ boundary()

QgsAbstractGeometry * QgsMultiPolygon::boundary ( ) const

overridevirtual

Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry).

For instance, a polygon geometry will have a boundary consisting of the linestrings for each ring in the polygon.

Returns: boundary for geometry. May be nullptr for some geometry types.

Reimplemented from QgsGeometryCollection.

Definition at line 189 of file qgsmultipolygon.cpp.

◆ cast()

static const QgsMultiPolygon * QgsMultiPolygon::cast ( const QgsAbstractGeometry * geom )

inlinestatic

Cast the geom to a QgsMultiPolygonV2.

Should be used by qgsgeometry_cast<QgsMultiPolygon *>( geometry ).

Note: Not available in Python. Objects will be automatically be converted to the appropriate target type.

Definition at line 108 of file qgsmultipolygon.h.

◆ clear()

void QgsMultiPolygon::clear ( )

overridevirtual

Clears the geometry, ie reset it to a null geometry.

Reimplemented from QgsGeometryCollection.

Definition at line 46 of file qgsmultipolygon.cpp.

◆ clone()

QgsMultiPolygon * QgsMultiPolygon::clone ( ) const

overridevirtual

Clones the geometry by performing a deep copy.

Reimplemented from QgsGeometryCollection.

Definition at line 59 of file qgsmultipolygon.cpp.

◆ createEmptyWithSameType()

QgsMultiPolygon * QgsMultiPolygon::createEmptyWithSameType ( ) const

overridevirtual

Creates a new geometry with the same class and same WKB type as the original and transfers ownership.

To create it, the geometry is default constructed and then the WKB is changed.

See also: clone()

Reimplemented from QgsGeometryCollection.

Definition at line 52 of file qgsmultipolygon.cpp.

◆ fromWkt()

bool QgsMultiPolygon::fromWkt ( const QString & wkt )

overridevirtual

Sets the geometry from a WKT string.

See also: fromWkb

Reimplemented from QgsGeometryCollection.

Definition at line 64 of file qgsmultipolygon.cpp.

◆ geometryType()

QString QgsMultiPolygon::geometryType ( ) const

overridevirtual

Returns a unique string representing the geometry type.

See also: wkbType; wktTypeStr

Reimplemented from QgsGeometryCollection.

Definition at line 41 of file qgsmultipolygon.cpp.

◆ insertGeometry()

bool QgsMultiPolygon::insertGeometry	(	QgsAbstractGeometry *	g,
		int	index
	)

overridevirtual

Inserts a geometry before a specified index and takes ownership.

Returns true in case of success.

Parameters

g	geometry to insert. Ownership is transferred to the collection.
index	position to insert geometry before

Reimplemented from QgsGeometryCollection.

Definition at line 167 of file qgsmultipolygon.cpp.

◆ polygonN() [1/2]

QgsPolygon * QgsMultiPolygon::polygonN ( int index )

Returns the polygon with the specified index.

Since: QGIS 3.16

Definition at line 31 of file qgsmultipolygon.cpp.

◆ polygonN() [2/2]

const QgsPolygon * QgsMultiPolygon::polygonN ( int index ) const

Returns the polygon with the specified index.

Note: Not available in Python bindings

Since: QGIS 3.16

Definition at line 36 of file qgsmultipolygon.cpp.

◆ toCurveType()

QgsMultiSurface * QgsMultiPolygon::toCurveType ( ) const

overridevirtual

Returns the geometry converted to the more generic curve type QgsMultiSurface.

Returns: the converted geometry. Caller takes ownership

Reimplemented from QgsGeometryCollection.

Definition at line 178 of file qgsmultipolygon.cpp.

◆ wktOmitChildType()

bool QgsMultiPolygon::wktOmitChildType ( ) const

overrideprotectedvirtual

Returns whether child type names are omitted from Wkt representations of the collection.

Reimplemented from QgsGeometryCollection.

Definition at line 224 of file qgsmultipolygon.cpp.

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

/build/qgis-3.36.0+99sid/src/core/geometry/qgsmultipolygon.h
/build/qgis-3.36.0+99sid/src/core/geometry/qgsmultipolygon.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsMultiPolygon()

Member Function Documentation

◆ addGeometry()

◆ asGml2()

◆ asGml3()

◆ asJsonObject()

◆ boundary()

◆ cast()

◆ clear()

◆ clone()

◆ createEmptyWithSameType()

◆ fromWkt()

◆ geometryType()

◆ insertGeometry()

◆ polygonN() [1/2]

◆ polygonN() [2/2]

◆ toCurveType()

◆ wktOmitChildType()