Point geometry type, with support for z-dimension and m-values. More...

#include <qgspoint.h>

Inheritance diagram for QgsPoint:

Public Member Functions
	QgsPoint (const QgsPointXY &p)
	Construct a QgsPoint from a QgsPointXY object. More...

	QgsPoint (double x=std::numeric_limits< double >::quiet_NaN(), double y=std::numeric_limits< double >::quiet_NaN(), double z=std::numeric_limits< double >::quiet_NaN(), double m=std::numeric_limits< double >::quiet_NaN(), QgsWkbTypes::Type wkbType=QgsWkbTypes::Unknown)
	Construct a point with the provided initial coordinate values. More...

	QgsPoint (QgsWkbTypes::Type wkbType, double x=std::numeric_limits< double >::quiet_NaN(), double y=std::numeric_limits< double >::quiet_NaN(), double z=std::numeric_limits< double >::quiet_NaN(), double m=std::numeric_limits< double >::quiet_NaN())
	Create a new point with the given wkbtype and values. More...

	QgsPoint (QPointF p)
	Construct a QgsPoint from a QPointF. More...

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

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

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

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. More...

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. More...

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

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

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

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

double	azimuth (const QgsPoint &other) const
	Calculates Cartesian azimuth between this point and other one (clockwise in degree, starting from north) More...

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

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

const QgsPoint *	cast (const QgsAbstractGeometry *geom) const
	Cast the geom to a QgsPoint. More...

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

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

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. More...

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

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

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

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

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

double	distance (const QgsPoint &other) const
	Returns the Cartesian 2D distance between this point and another point. More...

double	distance (double x, double y) const
	Returns the Cartesian 2D distance between this point and a specified x, y coordinate. More...

double	distance3D (const QgsPoint &other) const
	Returns the Cartesian 3D distance between this point and another point. More...

double	distance3D (double x, double y, double z) const
	Returns the Cartesian 3D distance between this point and a specified x, y, z coordinate. More...

double	distanceSquared (const QgsPoint &other) const
	Returns the Cartesian 2D squared distance between this point another point. More...

double	distanceSquared (double x, double y) const
	Returns the Cartesian 2D squared distance between this point a specified x, y coordinate. More...

double	distanceSquared3D (const QgsPoint &other) const
	Returns the Cartesian 3D squared distance between this point and another point. More...

double	distanceSquared3D (double x, double y, double z) const
	Returns the Cartesian 3D squared distance between this point and a specified x, y, z coordinate. More...

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

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

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

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. More...

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

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

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

double	inclination (const QgsPoint &other) const
	Calculates Cartesian inclination between this point and other one (starting from zenith = 0 to nadir = 180. More...

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

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

bool	isValid (QString &error, int flags=0) const override
	Checks validity of the geometry, and returns `true` if the geometry is valid. More...

double	m () const
	Returns the point's m value. More...

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

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

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

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

QgsPoint	operator+ (QgsVector v) const
	Adds a vector to this point. More...

QgsPoint &	operator+= (QgsVector v)
	Adds a vector to this point in place. More...

QgsVector	operator- (const QgsPoint &p) const
	Calculates the vector obtained by subtracting a point from this point. More...

QgsPoint	operator- (QgsVector v) const
	Subtracts a vector from this point. More...

QgsPoint &	operator-= (QgsVector v)
	Subtracts a vector from this point in place. More...

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

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

QgsPoint	project (double distance, double azimuth, double inclination=90.0) const
	Returns a new point which correspond to this point projected by a specified distance with specified angles (azimuth and inclination), using Cartesian mathematics. More...

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. More...

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

double &	rm ()
	Returns a reference to the m value of this point. More...

double &	rx ()
	Returns a reference to the x-coordinate of this point. More...

double &	ry ()
	Returns a reference to the y-coordinate of this point. More...

double &	rz ()
	Returns a reference to the z-coordinate of this point. More...

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

void	setM (double m)
	Sets the point's m-value. More...

void	setX (double x)
	Sets the point's x-coordinate. More...

void	setY (double y)
	Sets the point's y-coordinate. More...

void	setZ (double z)
	Sets the point's z-coordinate. More...

QgsPoint *	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. More...

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

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

QPointF	toQPointF () const
	Returns the point as a QPointF. More...

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

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. More...

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. More...

double	vertexAngle (QgsVertexId vertex) const override
	Angle undefined. More...

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

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

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

double	x () const
	Returns the point's x-coordinate. More...

double	y () const
	Returns the point's y-coordinate. More...

double	z () const
	Returns the point's z-coordinate. More...

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

	QgsAbstractGeometry (const QgsAbstractGeometry &geom)

virtual	~QgsAbstractGeometry ()=default

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

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

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

virtual QgsPoint	centroid () const
	Returns the centroid of the geometry. 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	hasCurvedSegments () const
	Returns `true` if the geometry contains curved segments. More...

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

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

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

QgsAbstractGeometry &	operator= (const QgsAbstractGeometry &geom)

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

QgsGeometryConstPartIterator	parts () const
	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 planar, 2-dimensional perimeter of the geometry. More...

virtual QgsAbstractGeometry *	segmentize (double tolerance=M_PI/180., SegmentationToleranceType toleranceType=MaximumAngle) const
	Returns a version of the geometry without curves. 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
int	childCount () const override
	Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e. More...

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

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

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

Properties
double	m

double	x

double	y

double	z

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 }
	WKB export flags. More...

Protected Attributes inherited from QgsAbstractGeometry
QgsWkbTypes::Type	mWkbType = QgsWkbTypes::Unknown

Detailed Description

Point geometry type, with support for z-dimension and m-values.

Since: QGIS 3.0, (previously QgsPointV2 since QGIS 2.10)

Definition at line 37 of file qgspoint.h.

Constructor & Destructor Documentation

◆ QgsPoint() [1/4]

QgsPoint::QgsPoint	(	double	x = `std::numeric_limits<double>::quiet_NaN()`,
		double	y = `std::numeric_limits<double>::quiet_NaN()`,
		double	z = `std::numeric_limits<double>::quiet_NaN()`,
		double	m = `std::numeric_limits<double>::quiet_NaN()`,
		QgsWkbTypes::Type	wkbType = `QgsWkbTypes::Unknown`
	)

Construct a point with the provided initial coordinate values.

If wkbType is set to QgsWkbTypes::Point, QgsWkbTypes::PointZ, QgsWkbTypes::PointM or QgsWkbTypes::PointZM the type will be set accordingly. If it is left to the default QgsWkbTypes::Unknown, the type will be set based on the following rules:

If only x and y are specified, the type will be a 2D point.
If any or both of the Z and M are specified, the appropriate type will be created.

pt = QgsPoint(43.4, 5.3)
pt.asWkt() # Point(43.4 5.3)
 
pt_z = QgsPoint(120, 343, 77)
pt.asWkt() # PointZ(120 343 77)
 
pt_m = QgsPoint(33, 88, m=5)
pt_m.m() # 5
pt_m.wkbType() # QgsWkbTypes.PointM
 
pt = QgsPoint(30, 40, wkbType=QgsWkbTypes.PointZ)
pt.z() # nan
pt.wkbType() # QgsWkbTypes.PointZ

Definition at line 39 of file qgspoint.cpp.

◆ QgsPoint() [2/4]

QgsPoint::QgsPoint ( const QgsPointXY & p )

explicit

Construct a QgsPoint from a QgsPointXY object.

Definition at line 63 of file qgspoint.cpp.

◆ QgsPoint() [3/4]

QgsPoint::QgsPoint ( QPointF p )

explicit

Construct a QgsPoint from a QPointF.

Definition at line 77 of file qgspoint.cpp.

◆ QgsPoint() [4/4]

QgsPoint::QgsPoint	(	QgsWkbTypes::Type	wkbType,
		double	x = `std::numeric_limits<double>::quiet_NaN()`,
		double	y = `std::numeric_limits<double>::quiet_NaN()`,
		double	z = `std::numeric_limits<double>::quiet_NaN()`,
		double	m = `std::numeric_limits<double>::quiet_NaN()`
	)

explicit

Create a new point with the given wkbtype and values.

Note: Not available in Python bindings

Definition at line 86 of file qgspoint.cpp.

Member Function Documentation

◆ addMValue()

bool QgsPoint::addMValue ( double mValue = 0 )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 522 of file qgspoint.cpp.

◆ addZValue()

bool QgsPoint::addZValue ( double zValue = 0 )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 511 of file qgspoint.cpp.

◆ adjacentVertices()

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

overridevirtual

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

Since: QGIS 3.0

Implements QgsAbstractGeometry.

Definition at line 463 of file qgspoint.cpp.

◆ asGml2()

QDomElement QgsPoint::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()

Implements QgsAbstractGeometry.

Definition at line 253 of file qgspoint.cpp.

◆ asGml3()

QDomElement QgsPoint::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()

Implements QgsAbstractGeometry.

Definition at line 276 of file qgspoint.cpp.

◆ asJsonObject()

json QgsPoint::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 QgsAbstractGeometry.

Definition at line 295 of file qgspoint.cpp.

◆ asKml()

QString QgsPoint::asKml ( int precision = 17 ) const

overridevirtual

Returns a KML representation of the geometry.

Since: QGIS 3.12

Implements QgsAbstractGeometry.

Definition at line 314 of file qgspoint.cpp.

◆ asWkb()

QByteArray QgsPoint::asWkb ( QgsAbstractGeometry::WkbFlags = nullptr ) const

override

Definition at line 212 of file qgspoint.cpp.

◆ asWkt()

QString QgsPoint::asWkt ( int precision = 17 ) const

overridevirtual

Returns a WKT representation of the geometry.

Parameters

precision number of decimal places for coordinates

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

Implements QgsAbstractGeometry.

Definition at line 234 of file qgspoint.cpp.

◆ azimuth()

double QgsPoint::azimuth ( const QgsPoint & other ) const

Calculates Cartesian azimuth between this point and other one (clockwise in degree, starting from north)

Since: QGIS 3.0

Definition at line 666 of file qgspoint.cpp.

◆ boundary()

QgsAbstractGeometry * QgsPoint::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.

Since: QGIS 3.0

Implements QgsAbstractGeometry.

Definition at line 384 of file qgspoint.cpp.

◆ boundingBox()

QgsRectangle QgsPoint::boundingBox ( ) const

overridevirtual

Returns the minimal bounding box for the geometry.

Implements QgsAbstractGeometry.

Definition at line 717 of file qgspoint.cpp.

◆ cast()

const QgsPoint* QgsPoint::cast ( const QgsAbstractGeometry * geom ) const

inline

Cast the geom to a QgsPoint.

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

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

Since: QGIS 3.0

Definition at line 567 of file qgspoint.h.

◆ childCount()

int QgsPoint::childCount ( ) const

overrideprotectedvirtual

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 from QgsAbstractGeometry.

Definition at line 732 of file qgspoint.cpp.

◆ childPoint()

QgsPoint QgsPoint::childPoint ( int index ) const

overrideprotectedvirtual

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

curve / point)

Note: used for vertex_iterator implementation

Since: QGIS 3.0

Reimplemented from QgsAbstractGeometry.

Definition at line 737 of file qgspoint.cpp.

◆ clear()

void QgsPoint::clear ( )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 324 of file qgspoint.cpp.

◆ clone()

QgsPoint * QgsPoint::clone ( ) const

overridevirtual

Clones the geometry by performing a deep copy.

Implements QgsAbstractGeometry.

Definition at line 102 of file qgspoint.cpp.

◆ closestSegment()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 430 of file qgspoint.cpp.

◆ convertTo()

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

overridevirtual

Converts the geometry to a specified type.

Returns: true if conversion was successful

Since: QGIS 2.14

Reimplemented from QgsAbstractGeometry.

Definition at line 580 of file qgspoint.cpp.

◆ coordinateSequence()

QgsCoordinateSequence QgsPoint::coordinateSequence ( ) const

overridevirtual

Retrieves the sequence of geometries, rings and nodes.

Returns: coordinate sequence

Implements QgsAbstractGeometry.

Definition at line 361 of file qgspoint.cpp.

◆ createEmptyWithSameType()

QgsPoint * QgsPoint::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()

Since: 3.0

Implements QgsAbstractGeometry.

Definition at line 743 of file qgspoint.cpp.

◆ deleteVertex()

bool QgsPoint::deleteVertex ( QgsVertexId position )

overridevirtual

Deletes a vertex within the geometry.

Parameters

position vertex id for vertex to delete

Returns: true if delete was successful

See also: insertVertex; moveVertex

Implements QgsAbstractGeometry.

Definition at line 424 of file qgspoint.cpp.

◆ dimension()

int QgsPoint::dimension ( ) const

overridevirtual

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.

Implements QgsAbstractGeometry.

Definition at line 727 of file qgspoint.cpp.

◆ distance() [1/2]

double QgsPoint::distance ( const QgsPoint & other ) const

inline

Returns the Cartesian 2D distance between this point and another point.

In certain cases it may be more appropriate to call the faster distanceSquared() method, e.g., when comparing distances.

Since: QGIS 3.0

Definition at line 361 of file qgspoint.h.

◆ distance() [2/2]

double QgsPoint::distance	(	double	x,
		double	y
	)		const

inline

Returns the Cartesian 2D distance between this point and a specified x, y coordinate.

In certain cases it may be more appropriate to call the faster distanceSquared() method, e.g., when comparing distances.

See also: distanceSquared()

Since: QGIS 3.0

Definition at line 350 of file qgspoint.h.

◆ distance3D() [1/2]

double QgsPoint::distance3D ( const QgsPoint & other ) const

Returns the Cartesian 3D distance between this point and another point.

In certain cases it may be more appropriate to call the faster distanceSquared() method, e.g., when comparing distances.

Since: QGIS 3.0

Definition at line 639 of file qgspoint.cpp.

◆ distance3D() [2/2]

double QgsPoint::distance3D	(	double	x,
		double	y,
		double	z
	)		const

Returns the Cartesian 3D distance between this point and a specified x, y, z coordinate.

In certain cases it may be more appropriate to call the faster distanceSquared() method, e.g., when comparing distances.

See also: distanceSquared()

Since: QGIS 3.0

Definition at line 630 of file qgspoint.cpp.

◆ distanceSquared() [1/2]

double QgsPoint::distanceSquared ( const QgsPoint & other ) const

inline

Returns the Cartesian 2D squared distance between this point another point.

Calling this is faster than calling distance(), and may be useful in use cases such as comparing distances where the extra expense of calling distance() is not required.

See also: distance()

Since: QGIS 3.0

Definition at line 385 of file qgspoint.h.

◆ distanceSquared() [2/2]

double QgsPoint::distanceSquared	(	double	x,
		double	y
	)		const

inline

Returns the Cartesian 2D squared distance between this point a specified x, y coordinate.

Calling this is faster than calling distance(), and may be useful in use cases such as comparing distances where the extra expense of calling distance() is not required.

See also: distance()

Since: QGIS 3.0

Definition at line 373 of file qgspoint.h.

◆ distanceSquared3D() [1/2]

double QgsPoint::distanceSquared3D ( const QgsPoint & other ) const

Returns the Cartesian 3D squared distance between this point and another point.

Calling this is faster than calling distance(), and may be useful in use cases such as comparing distances where the extra expense of calling distance() is not required.

See also: distance()

Since: QGIS 3.0

Definition at line 657 of file qgspoint.cpp.

◆ distanceSquared3D() [2/2]

double QgsPoint::distanceSquared3D	(	double	x,
		double	y,
		double	z
	)		const

Returns the Cartesian 3D squared distance between this point and a specified x, y, z coordinate.

Calling this is faster than calling distance(), and may be useful in use cases such as comparing distances where the extra expense of calling distance() is not required.

See also: distance()

Since: QGIS 3.0

Definition at line 648 of file qgspoint.cpp.

◆ draw()

void QgsPoint::draw ( QPainter & p ) const

overridevirtual

Draws the geometry using the specified QPainter.

Parameters

p	destination QPainter

Implements QgsAbstractGeometry.

Definition at line 319 of file qgspoint.cpp.

◆ dropMValue()

bool QgsPoint::dropMValue ( )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 563 of file qgspoint.cpp.

◆ dropZValue()

bool QgsPoint::dropZValue ( )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 552 of file qgspoint.cpp.

◆ filterVertices()

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

overridevirtual

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 from QgsAbstractGeometry.

Definition at line 613 of file qgspoint.cpp.

◆ fromWkb()

bool QgsPoint::fromWkb ( QgsConstWkbPtr & wkb )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 133 of file qgspoint.cpp.

◆ fromWkt()

bool QgsPoint::fromWkt ( const QString & wkt )

overridevirtual

Sets the geometry from a WKT string.

See also: fromWkb

Implements QgsAbstractGeometry.

Definition at line 161 of file qgspoint.cpp.

◆ geometryType()

QString QgsPoint::geometryType ( ) const

overridevirtual

Returns a unique string representing the geometry type.

See also: wkbType; wktTypeStr

Implements QgsAbstractGeometry.

Definition at line 722 of file qgspoint.cpp.

◆ inclination()

double QgsPoint::inclination ( const QgsPoint & other ) const

Calculates Cartesian inclination between this point and other one (starting from zenith = 0 to nadir = 180.

Horizon = 90) Returns 90.0 if the distance between this point and other one is equal to 0 (same point).

Since: QGIS 3.0

Definition at line 673 of file qgspoint.cpp.

◆ insertVertex()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 394 of file qgspoint.cpp.

◆ isEmpty()

bool QgsPoint::isEmpty ( ) const

overridevirtual

Returns true if the geometry is empty.

Reimplemented from QgsAbstractGeometry.

Definition at line 712 of file qgspoint.cpp.

◆ isValid()

bool QgsPoint::isValid	(	QString &	error,
		int	flags = `0`
	)		const

overridevirtual

Checks validity of the geometry, and returns true if the geometry is valid.

Parameters

error	will be set to the validity error message
flags	indicates optional flags which control the type of validity checking performed (corresponding to QgsGeometry::ValidityFlags).

Returns: true if geometry is valid

Since: QGIS 3.8

Implements QgsAbstractGeometry.

Definition at line 389 of file qgspoint.cpp.

◆ m()

double QgsPoint::m ( ) const

inline

Returns the point's m value.

See also: setM(); rm()

Definition at line 244 of file qgspoint.h.

◆ moveVertex()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 407 of file qgspoint.cpp.

◆ nCoordinates()

int QgsPoint::nCoordinates ( ) const

overridevirtual

Returns the number of nodes contained in the geometry.

Reimplemented from QgsAbstractGeometry.

Definition at line 371 of file qgspoint.cpp.

◆ nextVertex()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 441 of file qgspoint.cpp.

◆ operator!=()

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

inlineoverridevirtual

Implements QgsAbstractGeometry.

Definition at line 213 of file qgspoint.h.

◆ operator+()

QgsPoint QgsPoint::operator+ ( QgsVector v ) const

inline

Adds a vector to this point.

Since: QGIS 3.0

Definition at line 492 of file qgspoint.h.

◆ operator+=()

QgsPoint& QgsPoint::operator+= ( QgsVector v )

inline

Adds a vector to this point in place.

Since: QGIS 3.0

Definition at line 480 of file qgspoint.h.

◆ operator-() [1/2]

QgsVector QgsPoint::operator- ( const QgsPoint & p ) const

inline

Calculates the vector obtained by subtracting a point from this point.

Since: QGIS 3.0

Definition at line 474 of file qgspoint.h.

◆ operator-() [2/2]

QgsPoint QgsPoint::operator- ( QgsVector v ) const

inline

Subtracts a vector from this point.

Since: QGIS 3.0

Definition at line 498 of file qgspoint.h.

◆ operator-=()

QgsPoint& QgsPoint::operator-= ( QgsVector v )

inline

Subtracts a vector from this point in place.

Since: QGIS 3.0

Definition at line 486 of file qgspoint.h.

◆ operator==()

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

inlineoverridevirtual

Implements QgsAbstractGeometry.

Definition at line 165 of file qgspoint.h.

◆ partCount()

int QgsPoint::partCount ( ) const

overridevirtual

Returns count of parts contained in the geometry.

See also: vertexCount; ringCount

Implements QgsAbstractGeometry.

Definition at line 485 of file qgspoint.cpp.

◆ project()

QgsPoint QgsPoint::project	(	double	distance,
		double	azimuth,
		double	inclination = `90.0`
	)		const

Returns a new point which correspond to this point projected by a specified distance with specified angles (azimuth and inclination), using Cartesian mathematics.

M value is preserved.

Parameters

distance	distance to project
azimuth	angle to project in X Y, clockwise in degrees starting from north
inclination	angle to project in Z (3D). If the point is 2D, the Z value is assumed to be 0.

Returns: The point projected. If a 2D point is projected a 3D point will be returned except if inclination is 90. A 3D point is always returned if a 3D point is projected.

Example

p = QgsPoint( 1, 2 ) # 2D point
pr = p.project ( 1, 0 )
# pr is a 2D point: 'Point (1 3)'
pr = p.project ( 1, 0, 90 )
# pr is a 2D point: 'Point (1 3)'
pr = p.project (1, 0, 0 )
# pr is a 3D point: 'PointZ (1 2 1)'
p = QgsPoint( QgsWkbTypes.PointZ, 1, 2, 2 ) # 3D point
pr = p.project ( 1, 0 )
# pr is a 3D point: 'PointZ (1 3 2)'
pr = p.project ( 1, 0, 90 )
# pr is a 3D point: 'PointZ (1 3 2)'
pr = p.project (1, 0, 0 )
# pr is a 3D point: 'PointZ (1 2 3)'

Since: QGIS 3.0

Definition at line 685 of file qgspoint.cpp.

◆ removeDuplicateNodes()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 128 of file qgspoint.cpp.

◆ ringCount()

int QgsPoint::ringCount ( int part = 0 ) const

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 480 of file qgspoint.cpp.

◆ rm()

double& QgsPoint::rm ( )

inline

Returns a reference to the m value of this point.

Using a reference makes it possible to directly manipulate m in place.

See also: m(); setM()

Note: not available in Python bindings

Definition at line 280 of file qgspoint.h.

◆ rx()

double& QgsPoint::rx ( )

inline

Returns a reference to the x-coordinate of this point.

Using a reference makes it possible to directly manipulate x in place.

See also: x(); setX()

Note: not available in Python bindings

Definition at line 253 of file qgspoint.h.

◆ ry()

double& QgsPoint::ry ( )

inline

Returns a reference to the y-coordinate of this point.

Using a reference makes it possible to directly manipulate y in place.

See also: y(); setY()

Note: not available in Python bindings

Definition at line 262 of file qgspoint.h.

◆ rz()

double& QgsPoint::rz ( )

inline

Returns a reference to the z-coordinate of this point.

Using a reference makes it possible to directly manipulate z in place.

See also: z(); setZ()

Note: not available in Python bindings

Definition at line 271 of file qgspoint.h.

◆ segmentLength()

double QgsPoint::segmentLength ( QgsVertexId startVertex ) const

overridevirtual

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

Warning: QgsAbstractGeometry objects are inherently Cartesian/planar geometries, and the lengths returned by this method are calculated using strictly Cartesian mathematics.

Since: QGIS 3.0

Implements QgsAbstractGeometry.

Definition at line 500 of file qgspoint.cpp.

◆ setM()

void QgsPoint::setM ( double m )

inline

Sets the point's m-value.

Note: calling this will have no effect if the point does not contain a m-dimension. Use addMValue() to add a m value and force the point to have an m dimension.

See also: m(); rm()

Definition at line 326 of file qgspoint.h.

◆ setX()

void QgsPoint::setX ( double x )

inline

Sets the point's x-coordinate.

See also: x(); rx()

Definition at line 287 of file qgspoint.h.

◆ setY()

void QgsPoint::setY ( double y )

inline

Sets the point's y-coordinate.

See also: y(); ry()

Definition at line 298 of file qgspoint.h.

◆ setZ()

void QgsPoint::setZ ( double z )

inline

Sets the point's z-coordinate.

Note: calling this will have no effect if the point does not contain a z-dimension. Use addZValue() to add a z value and force the point to have a z dimension.

See also: z(); rz()

Definition at line 311 of file qgspoint.h.

◆ snappedToGrid()

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

overridevirtual

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 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

Implements QgsAbstractGeometry.

Definition at line 107 of file qgspoint.cpp.

◆ swapXy()

void QgsPoint::swapXy ( )

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 574 of file qgspoint.cpp.

◆ toCurveType()

QgsPoint * QgsPoint::toCurveType ( ) const

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 495 of file qgspoint.cpp.

◆ toQPointF()

QPointF QgsPoint::toQPointF ( ) const

inline

Returns the point as a QPointF.

Since: QGIS 2.14

Definition at line 338 of file qgspoint.h.

◆ transform() [1/2]

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

overridevirtual

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.

Implements QgsAbstractGeometry.

Definition at line 347 of file qgspoint.cpp.

◆ transform() [2/2]

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

overridevirtual

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.

Implements QgsAbstractGeometry.

Definition at line 533 of file qgspoint.cpp.

◆ transformVertices()

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

overridevirtual

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 from QgsAbstractGeometry.

Definition at line 618 of file qgspoint.cpp.

◆ vertexAngle()

double QgsPoint::vertexAngle ( QgsVertexId vertex ) const

overridevirtual

Angle undefined.

Always returns 0.0

Parameters

vertex the vertex id

Returns: 0.0

Implements QgsAbstractGeometry.

Definition at line 469 of file qgspoint.cpp.

◆ vertexAt()

QgsPoint QgsPoint::vertexAt ( QgsVertexId id ) const

overridevirtual

Returns the point corresponding to a specified vertex id.

Implements QgsAbstractGeometry.

Definition at line 490 of file qgspoint.cpp.

◆ vertexCount()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 475 of file qgspoint.cpp.

◆ vertexNumberFromVertexId()

int QgsPoint::vertexNumberFromVertexId ( QgsVertexId id ) const

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 376 of file qgspoint.cpp.

◆ x()

double QgsPoint::x ( ) const

inline

Returns the point's x-coordinate.

See also: setX(); rx()

Definition at line 223 of file qgspoint.h.

◆ y()

double QgsPoint::y ( ) const

inline

Returns the point's y-coordinate.

See also: setY(); ry()

Definition at line 230 of file qgspoint.h.

◆ z()

double QgsPoint::z ( ) const

inline

Returns the point's z-coordinate.

See also: setZ(); rz()

Definition at line 237 of file qgspoint.h.

Property Documentation

◆ m

double QgsPoint::m

readwrite

Definition at line 61 of file qgspoint.h.

◆ x

double QgsPoint::x

readwrite

Definition at line 58 of file qgspoint.h.

◆ y

double QgsPoint::y

readwrite

Definition at line 59 of file qgspoint.h.

◆ z

double QgsPoint::z

readwrite

Definition at line 60 of file qgspoint.h.

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

/build/qgis-3.14.0+99unstable/src/core/geometry/qgspoint.h
/build/qgis-3.14.0+99unstable/src/core/geometry/qgspoint.cpp

Public Member Functions

Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsPoint() [1/4]

◆ QgsPoint() [2/4]

◆ QgsPoint() [3/4]

◆ QgsPoint() [4/4]

Member Function Documentation

◆ addMValue()

◆ addZValue()

◆ adjacentVertices()

◆ asGml2()

◆ asGml3()

◆ asJsonObject()

◆ asKml()

◆ asWkb()

◆ asWkt()

◆ azimuth()

◆ boundary()

◆ boundingBox()

◆ cast()

◆ childCount()

◆ childPoint()

◆ clear()

◆ clone()

◆ closestSegment()

◆ convertTo()

◆ coordinateSequence()

◆ createEmptyWithSameType()

◆ deleteVertex()

◆ dimension()

◆ distance() [1/2]

◆ distance() [2/2]

◆ distance3D() [1/2]

◆ distance3D() [2/2]

◆ distanceSquared() [1/2]

◆ distanceSquared() [2/2]

◆ distanceSquared3D() [1/2]

◆ distanceSquared3D() [2/2]

◆ draw()

◆ dropMValue()

◆ dropZValue()

◆ filterVertices()

◆ fromWkb()

◆ fromWkt()

◆ geometryType()

◆ inclination()

◆ insertVertex()

◆ isEmpty()

◆ isValid()

◆ m()

◆ moveVertex()

◆ nCoordinates()

◆ nextVertex()

◆ operator!=()

◆ operator+()

◆ operator+=()

◆ operator-() [1/2]

◆ operator-() [2/2]

◆ operator-=()

◆ operator==()

◆ partCount()

◆ project()

Example

◆ removeDuplicateNodes()

◆ ringCount()

◆ rm()

◆ rx()

◆ ry()

◆ rz()

◆ segmentLength()

◆ setM()

◆ setX()

◆ setY()

◆ setZ()

◆ snappedToGrid()

Example