Abstract base class for all geometries. More...

#include <qgsabstractgeometry.h>

Inheritance diagram for QgsAbstractGeometry:

[legend]

Classes
class	const_part_iterator
	The part_iterator class provides STL-style iterator for const references to geometry parts. More...

class	part_iterator
	The part_iterator class provides STL-style iterator for geometry parts. More...

class	vertex_iterator
	The vertex_iterator class provides STL-style iterator for vertices. More...

Public Types
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...

Public Member Functions
	QgsAbstractGeometry ()=default
	Constructor for QgsAbstractGeometry. More...

	QgsAbstractGeometry (const QgsAbstractGeometry &geom)

virtual	~QgsAbstractGeometry ()=default

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

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

virtual void	adjacentVertices (QgsVertexId vertex, QgsVertexId &previousVertex, QgsVertexId &nextVertex) const =0
	Returns the vertices adjacent to a specified vertex within a geometry. More...

virtual double	area () const
	Returns the area of the geometry. More...

virtual QDomElement	asGml2 (QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
	Returns a GML2 representation of the geometry. More...

virtual QDomElement	asGml3 (QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
	Returns a GML3 representation of the geometry. More...

virtual QString	asJson (int precision=17) const =0
	Returns a GeoJSON representation of the geometry. More...

virtual QByteArray	asWkb () const =0
	Returns a WKB representation of the geometry. More...

virtual QString	asWkt (int precision=17) const =0
	Returns a WKT representation of the geometry. More...

virtual QgsAbstractGeometry *	boundary () const =0
	Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). More...

virtual QgsRectangle	boundingBox () const =0
	Returns the minimal bounding box for the geometry. More...

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

virtual void	clear ()=0
	Clears the geometry, ie reset it to a null geometry. More...

virtual QgsAbstractGeometry *	clone () const =0
	Clones the geometry by performing a deep copy. More...

virtual double	closestSegment (const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int leftOf=nullptr, double epsilon=4 std::numeric_limits< double >::epsilon()) const =0
	Searches for the closest segment of the geometry to a given point. More...

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

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

virtual bool	convertTo (QgsWkbTypes::Type type)
	Converts the geometry to a specified type. More...

virtual QgsCoordinateSequence	coordinateSequence () const =0
	Retrieves the sequence of geometries, rings and nodes. More...

virtual QgsAbstractGeometry *	createEmptyWithSameType () const =0
	Creates a new geometry with the same class and same WKB type as the original and transfers ownership. More...

virtual bool	deleteVertex (QgsVertexId position)=0
	Deletes a vertex within the geometry. More...

virtual int	dimension () const =0
	Returns the inherent dimension of the geometry. More...

virtual void	draw (QPainter &p) const =0
	Draws the geometry using the specified QPainter. More...

virtual bool	dropMValue ()=0
	Drops any measure values which exist in the geometry. More...

virtual bool	dropZValue ()=0
	Drops any z-dimensions which exist in the geometry. More...

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

virtual bool	fromWkb (QgsConstWkbPtr &wkb)=0
	Sets the geometry from a WKB string. More...

virtual bool	fromWkt (const QString &wkt)=0
	Sets the geometry from a WKT string. More...

virtual QString	geometryType () const =0
	Returns a unique string representing the geometry type. More...

virtual bool	hasCurvedSegments () const
	Returns true if the geometry contains curved segments. More...

virtual bool	insertVertex (QgsVertexId position, const QgsPoint &vertex)=0
	Inserts a vertex into the geometry. More...

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

virtual bool	isEmpty () const
	Returns true if the geometry is empty. More...

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

virtual double	length () const
	Returns the length of the geometry. More...

virtual bool	moveVertex (QgsVertexId position, const QgsPoint &newPos)=0
	Moves a vertex within the geometry. More...

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

virtual bool	nextVertex (QgsVertexId &id, QgsPoint &vertex) const =0
	Returns next vertex id and coordinates. More...

virtual bool	operator!= (const QgsAbstractGeometry &other) const =0

QgsAbstractGeometry &	operator= (const QgsAbstractGeometry &geom)

virtual bool	operator== (const QgsAbstractGeometry &other) const =0

virtual int	partCount () const =0
	Returns count of parts contained in the geometry. More...

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

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

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

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

virtual double	perimeter () const
	Returns the perimeter of the geometry. More...

virtual bool	removeDuplicateNodes (double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false)=0
	Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry. More...

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

virtual QgsAbstractGeometry *	segmentize (double tolerance=M_PI/180., SegmentationToleranceType toleranceType=MaximumAngle) const
	Returns a version of the geometry without curves. More...

virtual double	segmentLength (QgsVertexId startVertex) const =0
	Returns the length of the segment of the geometry which begins at startVertex. More...

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

virtual void	swapXy ()=0
	Swaps the x and y coordinates from the geometry. More...

virtual QgsAbstractGeometry *	toCurveType () const =0
	Returns the geometry converted to the more generic curve type. More...

virtual void	transform (const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d=QgsCoordinateTransform::ForwardTransform, bool transformZ=false) SIP_THROW(QgsCsException)=0
	Transforms the geometry using a coordinate transform. More...

virtual void	transform (const QTransform &t, double zTranslate=0.0, double zScale=1.0, double mTranslate=0.0, double mScale=1.0)=0
	Transforms the x and y components of the geometry using a QTransform object t. More...

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

virtual double	vertexAngle (QgsVertexId vertex) const =0
	Returns approximate angle at a vertex. More...

virtual QgsPoint	vertexAt (QgsVertexId id) const =0
	Returns the point corresponding to a specified vertex id. More...

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

virtual int	vertexNumberFromVertexId (QgsVertexId id) const =0
	Returns the vertex number corresponding to a vertex id. More...

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

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

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

QgsWkbTypes::Type	wkbType () const
	Returns the WKB type of the geometry. More...

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

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

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

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

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

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

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

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

Protected Attributes
QgsWkbTypes::Type	mWkbType = QgsWkbTypes::Unknown

Friends
class	TestQgsGeometry

Detailed Description

Abstract base class for all geometries.

Since: QGIS 2.10

Definition at line 57 of file qgsabstractgeometry.h.

Member Enumeration Documentation

◆ AxisOrder

enum QgsAbstractGeometry::AxisOrder

Axis order for GML generation.

Enumerator
XY	X comes before Y (or lon before lat)
YX	Y comes before X (or lat before lon)

Definition at line 114 of file qgsabstractgeometry.h.

◆ SegmentationToleranceType

enum QgsAbstractGeometry::SegmentationToleranceType

Segmentation tolerance as maximum angle or maximum difference between approximation and circle.

Enumerator
MaximumAngle	Maximum angle between generating radii (lines from arc center to output vertices)
MaximumDifference	Maximum distance between an arbitrary point on the original curve and closest point on its approximation.

Definition at line 98 of file qgsabstractgeometry.h.

Constructor & Destructor Documentation

◆ QgsAbstractGeometry() [1/2]

QgsAbstractGeometry::QgsAbstractGeometry ( )

default

Constructor for QgsAbstractGeometry.

◆ ~QgsAbstractGeometry()

virtual QgsAbstractGeometry::~QgsAbstractGeometry ( )

virtualdefault

◆ QgsAbstractGeometry() [2/2]

QgsAbstractGeometry::QgsAbstractGeometry ( const QgsAbstractGeometry & geom )

Definition at line 27 of file qgsabstractgeometry.cpp.

Member Function Documentation

◆ addMValue()

virtual bool QgsAbstractGeometry::addMValue ( double mValue = 0 )

pure virtual

Adds a measure to the geometry, initialized to a preset value.

Parameters

mValue initial m-value for all nodes

Returns: true on success

See also: dropMValue(); addZValue()

Since: QGIS 2.12

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ addZValue()

virtual bool QgsAbstractGeometry::addZValue ( double zValue = 0 )

pure virtual

Adds a z-dimension to the geometry, initialized to a preset value.

Parameters

zValue initial z-value for all nodes

Returns: true on success

See also: dropZValue(); addMValue()

Since: QGIS 2.12

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ adjacentVertices()

virtual void QgsAbstractGeometry::adjacentVertices	(	QgsVertexId	vertex,
		QgsVertexId &	previousVertex,
		QgsVertexId &	nextVertex
	)		const

pure virtual

Returns the vertices adjacent to a specified vertex within a geometry.

Since: QGIS 3.0

Implemented in QgsPoint, QgsCurvePolygon, QgsCurve, and QgsGeometryCollection.

◆ area()

double QgsAbstractGeometry::area ( ) const

virtual

Returns the area of the geometry.

See also: length(); perimeter()

Reimplemented in QgsGeometryCollection, and QgsCurvePolygon.

Definition at line 141 of file qgsabstractgeometry.cpp.

◆ asGml2()

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

pure virtual

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()

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCurvePolygon, QgsCompoundCurve, QgsMultiPoint, QgsMultiCurve, QgsMultiLineString, QgsMultiSurface, and QgsMultiPolygon.

◆ asGml3()

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

pure virtual

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()

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsTriangle, QgsCurvePolygon, QgsCompoundCurve, QgsMultiPoint, QgsMultiCurve, QgsMultiLineString, QgsMultiSurface, and QgsMultiPolygon.

◆ asJson()

virtual QString QgsAbstractGeometry::asJson ( int precision = 17 ) const

pure virtual

Returns a GeoJSON representation of the geometry.

Parameters

precision number of decimal places for coordinates

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

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCurvePolygon, QgsCompoundCurve, QgsMultiPoint, QgsMultiCurve, QgsMultiLineString, QgsMultiSurface, and QgsMultiPolygon.

◆ asWkb()

virtual QByteArray QgsAbstractGeometry::asWkb ( ) const

pure virtual

Returns a WKB representation of the geometry.

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

Since: QGIS 3.0

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCurvePolygon, QgsCompoundCurve, and QgsPolygon.

◆ asWkt()

virtual QString QgsAbstractGeometry::asWkt ( int precision = 17 ) const

pure virtual

Returns a WKT representation of the geometry.

Parameters

precision number of decimal places for coordinates

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

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCurvePolygon, and QgsCompoundCurve.

◆ boundary()

virtual QgsAbstractGeometry* QgsAbstractGeometry::boundary ( ) const

pure virtual

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 null for some geometry types.

Since: QGIS 3.0

Implemented in QgsPoint, QgsCurve, QgsGeometryCollection, QgsTriangle, QgsCurvePolygon, QgsPolygon, QgsMultiCurve, QgsMultiPolygon, QgsMultiPoint, and QgsMultiSurface.

◆ boundingBox()

virtual QgsRectangle QgsAbstractGeometry::boundingBox ( ) const

pure virtual

Returns the minimal bounding box for the geometry.

Implemented in QgsPoint, QgsGeometryCollection, QgsCurve, and QgsSurface.

◆ calculateBoundingBox()

QgsRectangle QgsAbstractGeometry::calculateBoundingBox ( ) const

protectedvirtual

Default calculator for the minimal bounding box for the geometry.

Derived classes should override this method if a more efficient bounding box calculation is available.

Reimplemented in QgsLineString, QgsGeometryCollection, QgsCurvePolygon, QgsCircularString, and QgsCompoundCurve.

Definition at line 84 of file qgsabstractgeometry.cpp.

◆ centroid()

QgsPoint QgsAbstractGeometry::centroid ( ) const

virtual

Returns the centroid of the geometry.

Reimplemented in QgsLineString.

Definition at line 156 of file qgsabstractgeometry.cpp.

◆ childCount()

virtual int QgsAbstractGeometry::childCount ( ) const

inlineprotectedvirtual

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

curve / point)

Note: used for vertex_iterator implementation

Since: QGIS 3.0

Reimplemented in QgsPoint, QgsGeometryCollection, QgsCurvePolygon, and QgsCurve.

Definition at line 898 of file qgsabstractgeometry.h.

◆ childGeometry()

virtual QgsAbstractGeometry* QgsAbstractGeometry::childGeometry ( int index ) const

inlineprotectedvirtual

Returns pointer to child geometry (for geometries with child geometries - i.e.

geom. collection / polygon)

Note: used for vertex_iterator implementation

Since: QGIS 3.0

Reimplemented in QgsGeometryCollection, and QgsCurvePolygon.

Definition at line 905 of file qgsabstractgeometry.h.

◆ childPoint()

QgsPoint QgsAbstractGeometry::childPoint ( int index ) const

protectedvirtual

Returns point at index (for geometries without child geometries - i.e.

curve / point)

Note: used for vertex_iterator implementation

Since: QGIS 3.0

Reimplemented in QgsPoint, and QgsCurve.

Definition at line 281 of file qgsabstractgeometry.cpp.

◆ clear()

virtual void QgsAbstractGeometry::clear ( )

pure virtual

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

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsTriangle, QgsCurvePolygon, QgsCompoundCurve, QgsMultiPoint, QgsPolygon, QgsMultiLineString, QgsMultiCurve, QgsMultiPolygon, and QgsMultiSurface.

◆ clearCache()

void QgsAbstractGeometry::clearCache ( ) const

protectedvirtual

Clears any cached parameters associated with the geometry, e.g., bounding boxes.

Reimplemented in QgsGeometryCollection, QgsCurve, and QgsSurface.

Definition at line 111 of file qgsabstractgeometry.cpp.

◆ clone()

virtual QgsAbstractGeometry* QgsAbstractGeometry::clone ( ) const

pure virtual

Clones the geometry by performing a deep copy.

Implemented in QgsLineString, QgsPoint, QgsCircularString, QgsTriangle, QgsCurve, QgsCurvePolygon, QgsGeometryCollection, QgsCompoundCurve, QgsPolygon, QgsMultiLineString, QgsMultiPoint, QgsMultiPolygon, QgsMultiSurface, and QgsMultiCurve.

◆ closestSegment()

virtual double QgsAbstractGeometry::closestSegment	(	const QgsPoint &	pt,
		QgsPoint &	segmentPt,
		QgsVertexId &	vertexAfter,
		int *	leftOf = `nullptr`,
		double	epsilon = `4 *std::numeric_limits< double >::epsilon()`
	)		const

pure virtual

Searches for the closest segment of the geometry to a given point.

Parameters

pt	specifies the point to find closest segment to
segmentPt	storage for the closest point within the geometry
vertexAfter	storage for the ID of the vertex at the end of the closest segment
leftOf	indicates whether the point lies on the left side of the geometry (-1 if point is to the left of the geometry, +1 if the point is to the right of the geometry, or 0 for cases where left/right could not be determined, e.g. point exactly on a line) false if point is to right of segment)
epsilon	epsilon for segment snapping

Returns: squared distance to closest segment or negative value on error

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ const_parts_begin()

const_part_iterator QgsAbstractGeometry::const_parts_begin ( ) const

inline

Returns STL-style iterator pointing to the const first part of the geometry.

See also: const_parts_end()

Since: QGIS 3.6

Definition at line 724 of file qgsabstractgeometry.h.

◆ const_parts_end()

QgsAbstractGeometry::const_part_iterator QgsAbstractGeometry::const_parts_end ( ) const

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

See also: const_parts_begin()

Since: QGIS 3.6

Definition at line 265 of file qgsabstractgeometry.cpp.

◆ convertTo()

bool QgsAbstractGeometry::convertTo ( QgsWkbTypes::Type type )

virtual

Converts the geometry to a specified type.

Returns: true if conversion was successful

Since: QGIS 2.14

Reimplemented in QgsLineString, and QgsPoint.

Definition at line 208 of file qgsabstractgeometry.cpp.

◆ coordinateSequence()

virtual QgsCoordinateSequence QgsAbstractGeometry::coordinateSequence ( ) const

pure virtual

Retrieves the sequence of geometries, rings and nodes.

Returns: coordinate sequence

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ createEmptyWithSameType()

virtual QgsAbstractGeometry* QgsAbstractGeometry::createEmptyWithSameType ( ) const

pure virtual

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()

Since: 3.0

Implemented in QgsLineString, QgsPoint, QgsTriangle, QgsGeometryCollection, QgsCurvePolygon, QgsCircularString, QgsCompoundCurve, QgsPolygon, QgsMultiCurve, QgsMultiSurface, QgsMultiPoint, QgsMultiLineString, and QgsMultiPolygon.

◆ deleteVertex()

virtual bool QgsAbstractGeometry::deleteVertex ( QgsVertexId position )

pure virtual

Deletes a vertex within the geometry.

Parameters

position vertex id for vertex to delete

Returns: true if delete was successful

See also: insertVertex; moveVertex

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsTriangle.

◆ dimension()

virtual int QgsAbstractGeometry::dimension ( ) const

pure virtual

Returns the inherent dimension of the geometry.

For example, this is 0 for a point geometry, 1 for a linestring and 2 for a polygon.

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCurvePolygon, and QgsCompoundCurve.

◆ draw()

virtual void QgsAbstractGeometry::draw ( QPainter & p ) const

pure virtual

Draws the geometry using the specified QPainter.

Parameters

p	destination QPainter

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ dropMValue()

virtual bool QgsAbstractGeometry::dropMValue ( )

pure virtual

Drops any measure values which exist in the geometry.

Returns: true if m-values were present and have been removed

See also: addMValue(); dropZValue()

Since: QGIS 2.14

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ dropZValue()

virtual bool QgsAbstractGeometry::dropZValue ( )

pure virtual

Drops any z-dimensions which exist in the geometry.

Returns: true if Z values were present and have been removed

See also: addZValue(); dropMValue()

Since: QGIS 2.14

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ filterVertices()

void QgsAbstractGeometry::filterVertices ( const std::function< bool(const QgsPoint &) > & filter )

virtual

Filters the vertices from the geometry in place, removing any which do not return true for the filter function check.

Has no meaning when called on a single point geometry.

Depending on the filter used, this may result in an invalid geometry.

Note: Not available in Python bindings

Since: QGIS 3.2

Reimplemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsMultiPoint.

Definition at line 239 of file qgsabstractgeometry.cpp.

◆ fromWkb()

virtual bool QgsAbstractGeometry::fromWkb ( QgsConstWkbPtr & wkb )

pure virtual

Sets the geometry from a WKB string.

After successful read the wkb argument will be at the position where the reading has stopped.

See also: fromWkt

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsTriangle, QgsCurvePolygon, QgsCompoundCurve, and QgsPolygon.

◆ fromWkt()

virtual bool QgsAbstractGeometry::fromWkt ( const QString & wkt )

pure virtual

Sets the geometry from a WKT string.

See also: fromWkb

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsTriangle, QgsCurvePolygon, QgsCompoundCurve, QgsMultiCurve, QgsMultiLineString, QgsMultiPoint, QgsMultiSurface, and QgsMultiPolygon.

◆ geometryType()

virtual QString QgsAbstractGeometry::geometryType ( ) const

pure virtual

Returns a unique string representing the geometry type.

See also: wkbType; wktTypeStr

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsTriangle, QgsCurvePolygon, QgsCompoundCurve, QgsPolygon, QgsMultiLineString, QgsMultiPoint, QgsMultiCurve, QgsMultiPolygon, and QgsMultiSurface.

◆ hasChildGeometries()

bool QgsAbstractGeometry::hasChildGeometries ( ) const

protectedvirtual

Returns whether the geometry has any child geometries (false for point / curve, true otherwise)

Note: used for vertex_iterator implementation

Since: QGIS 3.0

Definition at line 276 of file qgsabstractgeometry.cpp.

◆ hasCurvedSegments()

bool QgsAbstractGeometry::hasCurvedSegments ( ) const

virtual

Returns true if the geometry contains curved segments.

Reimplemented in QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

Definition at line 294 of file qgsabstractgeometry.cpp.

◆ insertVertex()

virtual bool QgsAbstractGeometry::insertVertex	(	QgsVertexId	position,
		const QgsPoint &	vertex
	)

pure virtual

Inserts a vertex into the geometry.

Parameters

position	vertex id for position of inserted vertex
vertex	vertex to insert

Returns: true if insert was successful

See also: moveVertex; deleteVertex

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsTriangle.

◆ is3D()

bool QgsAbstractGeometry::is3D ( ) const

inline

Returns true if the geometry is 3D and contains a z-value.

See also: isMeasure

Definition at line 188 of file qgsabstractgeometry.h.

◆ isEmpty()

bool QgsAbstractGeometry::isEmpty ( ) const

virtual

Returns true if the geometry is empty.

Reimplemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

Definition at line 287 of file qgsabstractgeometry.cpp.

◆ isMeasure()

bool QgsAbstractGeometry::isMeasure ( ) const

inline

Returns true if the geometry contains m values.

See also: is3D

Definition at line 197 of file qgsabstractgeometry.h.

◆ length()

double QgsAbstractGeometry::length ( ) const

virtual

Returns the length of the geometry.

See also: area(); perimeter()

Reimplemented in QgsLineString, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

Definition at line 131 of file qgsabstractgeometry.cpp.

◆ moveVertex()

virtual bool QgsAbstractGeometry::moveVertex	(	QgsVertexId	position,
		const QgsPoint &	newPos
	)

pure virtual

Moves a vertex within the geometry.

Parameters

position	vertex id for vertex to move
newPos	new position of vertex

Returns: true if move was successful

See also: insertVertex; deleteVertex

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsTriangle.

◆ nCoordinates()

int QgsAbstractGeometry::nCoordinates ( ) const

virtual

Returns the number of nodes contained in the geometry.

Reimplemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsMultiPoint.

Definition at line 115 of file qgsabstractgeometry.cpp.

◆ nextVertex()

virtual bool QgsAbstractGeometry::nextVertex	(	QgsVertexId &	id,
		QgsPoint &	vertex
	)		const

pure virtual

Returns next vertex id and coordinates.

Parameters

id	initial value should be the starting vertex id. The next vertex id will be stored in this variable if found.
vertex	container for found node

Returns: false if at end

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ operator!=()

virtual bool QgsAbstractGeometry::operator!= ( const QgsAbstractGeometry & other ) const

pure virtual

Implemented in QgsPoint, QgsCurve, QgsGeometryCollection, and QgsCurvePolygon.

◆ operator=()

QgsAbstractGeometry & QgsAbstractGeometry::operator= ( const QgsAbstractGeometry & geom )

Definition at line 32 of file qgsabstractgeometry.cpp.

◆ operator==()

virtual bool QgsAbstractGeometry::operator== ( const QgsAbstractGeometry & other ) const

pure virtual

Implemented in QgsPoint, QgsCurve, QgsGeometryCollection, and QgsCurvePolygon.

◆ partCount()

virtual int QgsAbstractGeometry::partCount ( ) const

pure virtual

Returns count of parts contained in the geometry.

See also: vertexCount; ringCount

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ parts() [1/2]

QgsGeometryConstPartIterator QgsAbstractGeometry::parts ( ) const

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

This iterator returns read-only references to parts and cannot be used to modify the parts.

Note: Not available in Python bindings

Since: QGIS 3.6

Definition at line 260 of file qgsabstractgeometry.cpp.

◆ parts() [2/2]

QgsGeometryPartIterator QgsAbstractGeometry::parts ( )

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

This iterator can safely be used to modify parts of the geometry.

Example:
# print the WKT representation of each part in a multi-point geometry
geometry = QgsMultiPoint.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' )
for part in geometry.parts():
print(part.asWkt())
# single part geometries only have one part - this loop will iterate once only
geometry = QgsLineString.fromWkt( 'LineString( 0 0, 10 10 )' )
for part in geometry.parts():
print(part.asWkt())
# parts can be modified during the iteration
geometry = QgsMultiPoint.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' )
for part in geometry.parts():
part.transform(ct)
# part iteration can also be combined with vertex iteration
geometry = QgsMultiPolygon.fromWkt( 'MultiPolygon((( 0 0, 0 10, 10 10, 10 0, 0 0 ),( 5 5, 5 6, 6 6, 6 5, 5 5)),((20 2, 22 2, 22 4, 20 4, 20 2)))' )
for part in geometry.parts():
for v in part.vertices():
print(v.x(), v.y())

See also: vertices()

Since: QGIS 3.6

Definition at line 255 of file qgsabstractgeometry.cpp.

◆ parts_begin()

part_iterator QgsAbstractGeometry::parts_begin ( )

inline

Returns STL-style iterator pointing to the first part of the geometry.

See also: parts_end(); parts()

Since: QGIS 3.6

Definition at line 655 of file qgsabstractgeometry.h.

◆ parts_end()

QgsAbstractGeometry::part_iterator QgsAbstractGeometry::parts_end ( )

Returns STL-style iterator pointing to the imaginary part after the last part of the geometry.

See also: parts_begin(); parts()

Since: QGIS 3.6

Definition at line 249 of file qgsabstractgeometry.cpp.

◆ perimeter()

double QgsAbstractGeometry::perimeter ( ) const

virtual

Returns the perimeter of the geometry.

See also: area(); length()

Reimplemented in QgsGeometryCollection, and QgsCurvePolygon.

Definition at line 136 of file qgsabstractgeometry.cpp.

◆ removeDuplicateNodes()

virtual bool QgsAbstractGeometry::removeDuplicateNodes	(	double	epsilon = `4 *std::numeric_limits< double >::epsilon()`,
		bool	useZValues = `false`
	)

pure virtual

Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry.

The epsilon parameter specifies the tolerance for coordinates when determining that vertices are identical.

By default, z values are not considered when detecting duplicate nodes. E.g. two nodes with the same x and y coordinate but different z values will still be considered duplicate and one will be removed. If useZValues is true, then the z values are also tested and nodes with the same x and y but different z will be maintained.

Note that duplicate nodes are not tested between different parts of a multipart geometry. E.g. a multipoint geometry with overlapping points will not be changed by this method.

The function will return true if nodes were removed, or false if no duplicate nodes were found.

Since: QGIS 3.0

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsCurvePolygon.

◆ ringCount()

virtual int QgsAbstractGeometry::ringCount ( int part = 0 ) const

pure virtual

Returns the number of rings of which this geometry is built.

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ segmentize()

QgsAbstractGeometry * QgsAbstractGeometry::segmentize	(	double	tolerance = `M_PI / 180.`,
		SegmentationToleranceType	toleranceType = `MaximumAngle`
	)		const

virtual

Returns a version of the geometry without curves.

Caller takes ownership of the returned geometry.

Parameters

tolerance	segmentation tolerance
toleranceType	maximum segmentation angle or maximum difference between approximation and curve

Reimplemented in QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

Definition at line 299 of file qgsabstractgeometry.cpp.

◆ segmentLength()

virtual double QgsAbstractGeometry::segmentLength ( QgsVertexId startVertex ) const

pure virtual

Returns the length of the segment of the geometry which begins at startVertex.

Since: QGIS 3.0

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsMultiPoint.

◆ setZMTypeFromSubGeometry()

void QgsAbstractGeometry::setZMTypeFromSubGeometry	(	const QgsAbstractGeometry *	subggeom,
		QgsWkbTypes::Type	baseGeomType
	)

protected

Updates the geometry type based on whether sub geometries contain z or m values.

Definition at line 42 of file qgsabstractgeometry.cpp.

◆ snappedToGrid()

virtual QgsAbstractGeometry* QgsAbstractGeometry::snappedToGrid	(	double	hSpacing,
		double	vSpacing,
		double	dSpacing = `0`,
		double	mSpacing = `0`
	)		const

pure virtual

Makes a new geometry with all the points or vertices snapped to the closest point of the grid.

Ownership is transferred to the caller.

If the gridified geometry could not be calculated a nullptr will be returned. It may generate an invalid geometry (in some corner cases). It can also be thought as rounding the edges and it may be useful for removing errors. Example:

geometry->snappedToGrid(1, 1);

In this case we use a 2D grid of 1x1 to gridify. In this case, it can be thought like rounding the x and y of all the points/vertices to full units (remove all decimals).

Parameters

hSpacing	Horizontal spacing of the grid (x axis). 0 to disable.
vSpacing	Vertical spacing of the grid (y axis). 0 to disable.
dSpacing	Depth spacing of the grid (z axis). 0 (default) to disable.
mSpacing	Custom dimension spacing of the grid (m axis). 0 (default) to disable.

Since: 3.0

Implemented in QgsLineString, QgsPoint, QgsGeometryCollection, QgsCircularString, QgsCompoundCurve, and QgsCurvePolygon.

◆ swapXy()

virtual void QgsAbstractGeometry::swapXy ( )

pure virtual

Swaps the x and y coordinates from the geometry.

This can be used to repair geometries which have accidentally had their latitude and longitude coordinates reversed.

Since: QGIS 3.2

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ toCurveType()

virtual QgsAbstractGeometry* QgsAbstractGeometry::toCurveType ( ) const

pure virtual

Returns the geometry converted to the more generic curve type.

E.g. QgsLineString -> QgsCompoundCurve, QgsPolygon -> QgsCurvePolygon, QgsMultiLineString -> QgsMultiCurve, QgsMultiPolygon -> QgsMultiSurface

Returns: the converted geometry. Caller takes ownership

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCurve, QgsTriangle, QgsMultiLineString, QgsMultiPolygon, QgsPolygon, QgsMultiCurve, QgsMultiPoint, and QgsMultiSurface.

◆ transform() [1/2]

virtual void QgsAbstractGeometry::transform	(	const QgsCoordinateTransform &	ct,
		QgsCoordinateTransform::TransformDirection	d = `QgsCoordinateTransform::ForwardTransform`,
		bool	transformZ = `false`
	)

pure virtual

Transforms the geometry using a coordinate transform.

Parameters

ct	coordinate transform
d	transformation direction
transformZ	set to true to also transform z coordinates. This requires that the z coordinates in the geometry represent height relative to the vertical datum of the source CRS (generally ellipsoidal heights) and are expressed in its vertical units (generally meters). If false, then z coordinates will not be changed by the transform.

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ transform() [2/2]

virtual void QgsAbstractGeometry::transform	(	const QTransform &	t,
		double	zTranslate = `0.0`,
		double	zScale = `1.0`,
		double	mTranslate = `0.0`,
		double	mScale = `1.0`
	)

pure virtual

Transforms the x and y components of the geometry using a QTransform object t.

Optionally, the geometry's z values can be scaled via zScale and translated via zTranslate. Similarly, m-values can be scaled via mScale and translated via mTranslate.

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ transformVertices()

void QgsAbstractGeometry::transformVertices ( const std::function< QgsPoint(const QgsPoint &) > & transform )

virtual

Transforms the vertices from the geometry in place, applying the transform function to every vertex.

Depending on the transform used, this may result in an invalid geometry.

Transform functions are not permitted to alter the dimensionality of vertices. If a transform which adds (or removes) z/m values is desired, first call the corresponding addZValue() or addMValue() function to change the geometry's dimensionality and then transform.

Note: Not available in Python bindings

Since: QGIS 3.4

Reimplemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

Definition at line 244 of file qgsabstractgeometry.cpp.

◆ vertexAngle()

virtual double QgsAbstractGeometry::vertexAngle ( QgsVertexId vertex ) const

pure virtual

Returns approximate angle at a vertex.

This is usually the average angle between adjacent segments, and can be pictured as the orientation of a line following the curvature of the geometry at the specified vertex.

Parameters

vertex the vertex id

Returns: rotation in radians, clockwise from north

Implemented in QgsLineString, QgsPoint, QgsCurvePolygon, QgsGeometryCollection, QgsCircularString, and QgsCompoundCurve.

◆ vertexAt()

virtual QgsPoint QgsAbstractGeometry::vertexAt ( QgsVertexId id ) const

pure virtual

Returns the point corresponding to a specified vertex id.

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ vertexCount()

virtual int QgsAbstractGeometry::vertexCount	(	int	part = `0`,
		int	ring = `0`
	)		const

pure virtual

Returns the number of vertices of which this geometry is built.

Implemented in QgsPoint, QgsCurvePolygon, QgsGeometryCollection, and QgsCurve.

◆ vertexNumberFromVertexId()

virtual int QgsAbstractGeometry::vertexNumberFromVertexId ( QgsVertexId id ) const

pure virtual

Returns the vertex number corresponding to a vertex id.

The vertex numbers start at 0, so a return value of 0 corresponds to the first vertex.

Returns -1 if a corresponding vertex could not be found.

Since: QGIS 3.0

Implemented in QgsPoint, QgsCurvePolygon, QgsCurve, QgsGeometryCollection, and QgsMultiPoint.

◆ vertices()

QgsVertexIterator QgsAbstractGeometry::vertices ( ) const

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

Warning: The iterator returns a copy of individual vertices, and accordingly geometries cannot be modified using the iterator. See transformVertices() for a safe method to modify vertices "in-place".

Example:
# print the x and y coordinate for each vertex in a LineString
geometry = QgsLineString.fromWkt( 'LineString( 0 0, 1 1, 2 2)' )
for v in geometry.vertices():
print(v.x(), v.y())
# vertex iteration includes all parts and rings
geometry = QgsMultiPolygon.fromWkt( 'MultiPolygon((( 0 0, 0 10, 10 10, 10 0, 0 0 ),( 5 5, 5 6, 6 6, 6 5, 5 5)),((20 2, 22 2, 22 4, 20 4, 20 2)))' )
for v in geometry.vertices():
print(v.x(), v.y())

See also: parts()

Since: QGIS 3.0

Definition at line 271 of file qgsabstractgeometry.cpp.

◆ vertices_begin()

vertex_iterator QgsAbstractGeometry::vertices_begin ( ) const

inline

Returns STL-style iterator pointing to the first vertex of the geometry.

See also: vertices_end(); vertices()

Since: QGIS 3.0

Definition at line 798 of file qgsabstractgeometry.h.

◆ vertices_end()

vertex_iterator QgsAbstractGeometry::vertices_end ( ) const

inline

Returns STL-style iterator pointing to the imaginary vertex after the last vertex of the geometry.

See also: vertices_begin(); vertices()

Since: QGIS 3.0

Definition at line 811 of file qgsabstractgeometry.h.

◆ wkbType()

QgsWkbTypes::Type QgsAbstractGeometry::wkbType ( ) const

inline

Returns the WKB type of the geometry.

See also: geometryType; wktTypeStr

Definition at line 175 of file qgsabstractgeometry.h.

◆ wktTypeStr()

QString QgsAbstractGeometry::wktTypeStr ( ) const

Returns the WKT type string of the geometry.

See also: geometryType; wkbType

Definition at line 146 of file qgsabstractgeometry.cpp.

Friends And Related Function Documentation

◆ TestQgsGeometry

friend class TestQgsGeometry

friend

Definition at line 933 of file qgsabstractgeometry.h.

Member Data Documentation

◆ mWkbType

QgsWkbTypes::Type QgsAbstractGeometry::mWkbType = QgsWkbTypes::Unknown

protected

Definition at line 915 of file qgsabstractgeometry.h.

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

/tmp/buildd/qgis-3.6.0+99unstable/src/core/geometry/qgsabstractgeometry.h
/tmp/buildd/qgis-3.6.0+99unstable/src/core/geometry/qgsabstractgeometry.cpp

Classes

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Enumeration Documentation

◆ AxisOrder

◆ SegmentationToleranceType

Constructor & Destructor Documentation

◆ QgsAbstractGeometry() [1/2]

◆ ~QgsAbstractGeometry()

◆ QgsAbstractGeometry() [2/2]

Member Function Documentation

◆ addMValue()

◆ addZValue()

◆ adjacentVertices()

◆ area()

◆ asGml2()

◆ asGml3()

◆ asJson()

◆ asWkb()

◆ asWkt()

◆ boundary()

◆ boundingBox()

◆ calculateBoundingBox()

◆ centroid()

◆ childCount()

◆ childGeometry()

◆ childPoint()

◆ clear()

◆ clearCache()

◆ clone()

◆ closestSegment()

◆ const_parts_begin()

◆ const_parts_end()

◆ convertTo()

◆ coordinateSequence()

◆ createEmptyWithSameType()

◆ deleteVertex()

◆ dimension()

◆ draw()

◆ dropMValue()

◆ dropZValue()

◆ filterVertices()

◆ fromWkb()

◆ fromWkt()

◆ geometryType()

◆ hasChildGeometries()

◆ hasCurvedSegments()

◆ insertVertex()

◆ is3D()

◆ isEmpty()

◆ isMeasure()

◆ length()

◆ moveVertex()

◆ nCoordinates()

◆ nextVertex()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ partCount()

◆ parts() [1/2]

◆ parts() [2/2]

◆ parts_begin()

◆ parts_end()

◆ perimeter()

◆ removeDuplicateNodes()

◆ ringCount()

◆ segmentize()

◆ segmentLength()

◆ setZMTypeFromSubGeometry()

◆ snappedToGrid()

◆ swapXy()

◆ toCurveType()

◆ transform() [1/2]

◆ transform() [2/2]

◆ transformVertices()

◆ vertexAngle()