Polyhedral surface geometry type. More...

#include <qgspolyhedralsurface.h>

Inheritance diagram for QgsPolyhedralSurface:

[legend]

Public Member Functions
	QgsPolyhedralSurface ()

	QgsPolyhedralSurface (const QgsMultiPolygon *multiPolygon)
	Creates a polyhedral surface from a multiPolygon.

	QgsPolyhedralSurface (const QgsPolyhedralSurface &p)

	~QgsPolyhedralSurface () override

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

virtual void	addPatch (QgsPolygon *patch)
	Adds a patch to the geometry, transferring ownership to the polyhedral surface.

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.

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.

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
	Returns a WKB representation of the geometry.

QString	asWkt (int precision=17) const override
	Returns a WKT 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).

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

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

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

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.

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

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

int	dimension () const final
	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.

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

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

bool	hasCurvedSegments () const final
	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.

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 () override
	Reorganizes the geometry into a normalized form (or "canonical" form).

int	numPatches () const
	Returns the number of patches contained with the polyhedral surface.

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

QgsPolyhedralSurface &	operator= (const QgsPolyhedralSurface &p)

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

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

QgsPolygon *	patchN (int i)
	Retrieves a patch from the polyhedral surface.

const QgsPolygon *	patchN (int i) const
	Retrieves a patch from the polyhedral surface.

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.

bool	removePatch (int patchIndex)
	Removes a patch from the polyhedral surface.

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.

virtual void	setPatches (const QVector< QgsPolygon * > &patches)
	Sets all patches, transferring ownership to the polyhedral surface.

QgsPolyhedralSurface *	simplifyByDistance (double tolerance) const override
	Simplifies the geometry by applying the Douglas Peucker simplification by distance algorithm.

QgsPolyhedralSurface *	snappedToGrid (double hSpacing, double vSpacing, double dSpacing=0, double mSpacing=0, bool removeRedundantPoints=false) 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.

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

QgsMultiPolygon *	toMultiPolygon () const
	Converts a polyhedral surface to a multipolygon.

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

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

Public Member Functions inherited from QgsAbstractGeometry
	QgsAbstractGeometry ()=default

	QgsAbstractGeometry (const QgsAbstractGeometry &geom)

virtual	~QgsAbstractGeometry ()=default

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

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.

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

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.

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

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

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

Protected Member Functions
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.

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

Protected Member Functions inherited from QgsSurface
void	clearCache () const override
	Clears any cached parameters associated with the geometry, e.g., bounding boxes.

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.

Protected Attributes
QVector< QgsPolygon * >	mPatches

Protected Attributes inherited from QgsSurface
QgsBox3D	mBoundingBox

bool	mHasCachedValidity = false

QString	mValidityFailureReason

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

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...

typedef QFlags< WkbFlag >	WkbFlags

Detailed Description

Polyhedral surface geometry type.

A polyhedral surface is a collection of polygons which share common boundary segments.

Since: QGIS 3.40

Definition at line 37 of file qgspolyhedralsurface.h.

Constructor & Destructor Documentation

◆ QgsPolyhedralSurface() [1/3]

QgsPolyhedralSurface::QgsPolyhedralSurface ( )

Definition at line 38 of file qgspolyhedralsurface.cpp.

◆ QgsPolyhedralSurface() [2/3]

QgsPolyhedralSurface::QgsPolyhedralSurface ( const QgsPolyhedralSurface & p )

Definition at line 81 of file qgspolyhedralsurface.cpp.

◆ QgsPolyhedralSurface() [3/3]

QgsPolyhedralSurface::QgsPolyhedralSurface ( const QgsMultiPolygon * multiPolygon )

Creates a polyhedral surface from a multiPolygon.

Definition at line 43 of file qgspolyhedralsurface.cpp.

◆ ~QgsPolyhedralSurface()

QgsPolyhedralSurface::~QgsPolyhedralSurface ( )

override

Definition at line 59 of file qgspolyhedralsurface.cpp.

Member Function Documentation

◆ addMValue()

bool QgsPolyhedralSurface::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()

Implements QgsAbstractGeometry.

Definition at line 839 of file qgspolyhedralsurface.cpp.

◆ addPatch()

void QgsPolyhedralSurface::addPatch ( QgsPolygon * patch )

virtual

Adds a patch to the geometry, transferring ownership to the polyhedral surface.

Reimplemented in QgsTriangulatedSurface.

Definition at line 505 of file qgspolyhedralsurface.cpp.

◆ addZValue()

bool QgsPolyhedralSurface::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()

Implements QgsAbstractGeometry.

Definition at line 822 of file qgspolyhedralsurface.cpp.

◆ adjacentVertices()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 679 of file qgspolyhedralsurface.cpp.

◆ area()

double QgsPolyhedralSurface::area ( ) const

overridevirtual

Returns the planar, 2-dimensional area of the geometry.

Warning: QgsAbstractGeometry objects are inherently Cartesian/planar geometries, and the area returned by this method is calculated using strictly Cartesian mathematics. In contrast, the QgsDistanceArea class exposes methods for calculating the areas of geometries using geodesic calculations which account for the curvature of the Earth (or any other celestial body).

See also: length(); perimeter()

Reimplemented from QgsAbstractGeometry.

Definition at line 352 of file qgspolyhedralsurface.cpp.

◆ asGml2()

QDomElement QgsPolyhedralSurface::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.

Reimplemented in QgsTriangulatedSurface.

Definition at line 280 of file qgspolyhedralsurface.cpp.

◆ asGml3()

QDomElement QgsPolyhedralSurface::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.

Reimplemented in QgsTriangulatedSurface.

Definition at line 286 of file qgspolyhedralsurface.cpp.

◆ asJsonObject()

json QgsPolyhedralSurface::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 307 of file qgspolyhedralsurface.cpp.

◆ asKml()

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

overridevirtual

Returns a KML representation of the geometry.

Since: QGIS 3.12

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 315 of file qgspolyhedralsurface.cpp.

◆ asQPainterPath()

QPainterPath QgsPolyhedralSurface::asQPainterPath ( ) const

overridevirtual

Returns the geometry represented as a QPainterPath.

Warning: not all geometry subclasses can be represented by a QPainterPath, e.g. points and multipoint geometries will return an empty path.

Since: QGIS 3.16

Implements QgsAbstractGeometry.

Definition at line 542 of file qgspolyhedralsurface.cpp.

◆ asWkb()

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

overridevirtual

Returns a WKB representation of the geometry.

The optional flags argument specifies flags controlling WKB export behavior (since QGIS 3.14).

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

Implements QgsAbstractGeometry.

Definition at line 237 of file qgspolyhedralsurface.cpp.

◆ asWkt()

QString QgsPolyhedralSurface::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 252 of file qgspolyhedralsurface.cpp.

◆ boundary()

QgsAbstractGeometry * QgsPolyhedralSurface::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.

Implements QgsAbstractGeometry.

Definition at line 376 of file qgspolyhedralsurface.cpp.

◆ boundingBoxIntersects()

bool QgsPolyhedralSurface::boundingBoxIntersects ( const QgsBox3D & box3d ) const

overridevirtual

Returns true if the bounding box of this geometry intersects with a box3d.

Since this test only considers the bounding box of the geometry, is is very fast to calculate and handles invalid geometries.

Since: QGIS 3.34

Reimplemented from QgsAbstractGeometry.

Definition at line 465 of file qgspolyhedralsurface.cpp.

◆ calculateBoundingBox3D()

QgsBox3D QgsPolyhedralSurface::calculateBoundingBox3D ( ) const

overrideprotectedvirtual

Calculates the minimal 3D bounding box for the geometry.

See also: calculateBoundingBox()

Since: QGIS 3.34

Reimplemented from QgsAbstractGeometry.

Definition at line 211 of file qgspolyhedralsurface.cpp.

◆ cast()

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

inlinestatic

Cast the geom to a QgsPolyhedralSurface.

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

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

Definition at line 309 of file qgspolyhedralsurface.h.

◆ childCount()

int QgsPolyhedralSurface::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

Reimplemented from QgsAbstractGeometry.

Definition at line 960 of file qgspolyhedralsurface.cpp.

◆ childGeometry()

QgsAbstractGeometry * QgsPolyhedralSurface::childGeometry ( int index ) const

overrideprotectedvirtual

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

geom. collection / polygon)

Note: used for vertex_iterator implementation

Reimplemented from QgsAbstractGeometry.

Definition at line 965 of file qgspolyhedralsurface.cpp.

◆ clear()

void QgsPolyhedralSurface::clear ( )

overridevirtual

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

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 119 of file qgspolyhedralsurface.cpp.

◆ clone()

QgsPolyhedralSurface * QgsPolyhedralSurface::clone ( ) const

overridevirtual

Clones the geometry by performing a deep copy.

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 114 of file qgspolyhedralsurface.cpp.

◆ closestSegment()

double QgsPolyhedralSurface::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 642 of file qgspolyhedralsurface.cpp.

◆ compareToSameClass()

int QgsPolyhedralSurface::compareToSameClass ( const QgsAbstractGeometry * other ) const

overrideprotectedvirtual

Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries.

Note: The actual logic for the sorting is an internal detail only and is subject to change between QGIS versions. The result should only be used for direct comparison of geometries and not stored for later use.

Since: QGIS 3.20

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 970 of file qgspolyhedralsurface.cpp.

◆ coordinateSequence()

QgsCoordinateSequence QgsPolyhedralSurface::coordinateSequence ( ) const

overridevirtual

Retrieves the sequence of geometries, rings and nodes.

Returns: coordinate sequence

Implements QgsAbstractGeometry.

Definition at line 584 of file qgspolyhedralsurface.cpp.

◆ createEmptyWithSameType()

QgsPolyhedralSurface * QgsPolyhedralSurface::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()

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 64 of file qgspolyhedralsurface.cpp.

◆ deleteVertex()

bool QgsPolyhedralSurface::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.

Reimplemented in QgsTriangulatedSurface.

Definition at line 727 of file qgspolyhedralsurface.cpp.

◆ dimension()

int QgsPolyhedralSurface::dimension ( ) const

finalvirtual

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 76 of file qgspolyhedralsurface.cpp.

◆ draw()

void QgsPolyhedralSurface::draw ( QPainter & p ) const

overridevirtual

Draws the geometry using the specified QPainter.

Parameters

p	destination QPainter

Implements QgsAbstractGeometry.

Definition at line 555 of file qgspolyhedralsurface.cpp.

◆ dropMValue()

bool QgsPolyhedralSurface::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()

Implements QgsAbstractGeometry.

Definition at line 872 of file qgspolyhedralsurface.cpp.

◆ dropZValue()

bool QgsPolyhedralSurface::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()

Implements QgsAbstractGeometry.

Definition at line 856 of file qgspolyhedralsurface.cpp.

◆ filterVertices()

void QgsPolyhedralSurface::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 940 of file qgspolyhedralsurface.cpp.

◆ fromWkb()

bool QgsPolyhedralSurface::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.

Reimplemented in QgsTriangulatedSurface.

Definition at line 128 of file qgspolyhedralsurface.cpp.

◆ fromWkt()

bool QgsPolyhedralSurface::fromWkt ( const QString & wkt )

overridevirtual

Sets the geometry from a WKT string.

See also: fromWkb

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 167 of file qgspolyhedralsurface.cpp.

◆ fuzzyDistanceEqual()

bool QgsPolyhedralSurface::fuzzyDistanceEqual	(	const QgsAbstractGeometry &	other,
		double	epsilon = `1e-8`
	)		const

inlineoverridevirtual

Performs fuzzy distance comparison between this geometry and other using an epsilon.

Traditionally, the comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry. It focuses on the numerical differences or relationships between these values. On the other hand, comparing distances between points considers the actual spatial separation or length between the points, regardless of their coordinate values. This comparison involves measuring the distance between two points using formulas like the distance formula. Here, it's the "distance comparison" (fuzzyDistanceEqual).

See also: fuzzyEqual; QgsGeometryUtilsBase::fuzzyEqual

Since: QGIS 3.36

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 95 of file qgspolyhedralsurface.h.

◆ fuzzyEqual()

bool QgsPolyhedralSurface::fuzzyEqual	(	const QgsAbstractGeometry &	other,
		double	epsilon = `1e-8`
	)		const

inlineoverridevirtual

Performs fuzzy comparison between this geometry and other using an epsilon.

The comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry.

See also: fuzzyDistanceEqual; QgsGeometryUtilsBase::fuzzyDistanceEqual

Since: QGIS 3.36

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 91 of file qgspolyhedralsurface.h.

◆ geometryType()

QString QgsPolyhedralSurface::geometryType ( ) const

overridevirtual

Returns a unique string representing the geometry type.

See also: wkbType; wktTypeStr

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 71 of file qgspolyhedralsurface.cpp.

◆ hasCurvedSegments()

bool QgsPolyhedralSurface::hasCurvedSegments ( ) const

finalvirtual

Returns true if the geometry contains curved segments.

Reimplemented from QgsAbstractGeometry.

Definition at line 749 of file qgspolyhedralsurface.cpp.

◆ insertVertex()

bool QgsPolyhedralSurface::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.

Reimplemented in QgsTriangulatedSurface.

Definition at line 693 of file qgspolyhedralsurface.cpp.

◆ isEmpty()

bool QgsPolyhedralSurface::isEmpty ( ) const

overridevirtual

Returns true if the geometry is empty.

Reimplemented from QgsAbstractGeometry.

Definition at line 637 of file qgspolyhedralsurface.cpp.

◆ isValid()

bool QgsPolyhedralSurface::isValid	(	QString &	error,
		Qgis::GeometryValidityFlags	flags = `Qgis::GeometryValidityFlags()`
	)		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 Qgis::GeometryValidityFlags).

Returns: true if geometry is valid

Since: QGIS 3.8

Implements QgsAbstractGeometry.

Definition at line 999 of file qgspolyhedralsurface.cpp.

◆ moveVertex()

bool QgsPolyhedralSurface::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 710 of file qgspolyhedralsurface.cpp.

◆ nCoordinates()

int QgsPolyhedralSurface::nCoordinates ( ) const

overridevirtual

Returns the number of nodes contained in the geometry.

Reimplemented from QgsAbstractGeometry.

Definition at line 600 of file qgspolyhedralsurface.cpp.

◆ nextVertex()

bool QgsPolyhedralSurface::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 648 of file qgspolyhedralsurface.cpp.

◆ normalize()

void QgsPolyhedralSurface::normalize ( )

overridevirtual

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

Polygon rings will be rearranged so that their starting vertex is the lower left and ring orientation follows the right hand rule, collections are ordered by geometry type, and other normalization techniques are applied. The resultant geometry will be geometrically equivalent to the original geometry.

Since: QGIS 3.20

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 321 of file qgspolyhedralsurface.cpp.

◆ numPatches()

int QgsPolyhedralSurface::numPatches ( ) const

inline

Returns the number of patches contained with the polyhedral surface.

See also: patchN()

Definition at line 145 of file qgspolyhedralsurface.h.

◆ operator!=()

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

inlineoverridevirtual

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 105 of file qgspolyhedralsurface.h.

◆ operator=()

QgsPolyhedralSurface & QgsPolyhedralSurface::operator= ( const QgsPolyhedralSurface & p )

Definition at line 99 of file qgspolyhedralsurface.cpp.

◆ operator==()

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

inlineoverridevirtual

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 100 of file qgspolyhedralsurface.h.

◆ partCount()

int QgsPolyhedralSurface::partCount ( ) const

overridevirtual

Returns count of parts contained in the geometry.

See also: vertexCount; ringCount

Implements QgsAbstractGeometry.

Definition at line 798 of file qgspolyhedralsurface.cpp.

◆ patchN() [1/2]

QgsPolygon * QgsPolyhedralSurface::patchN ( int i )

inline

Retrieves a patch from the polyhedral surface.

The first patch has index 0.

See also: numPatches()

Definition at line 171 of file qgspolyhedralsurface.h.

◆ patchN() [2/2]

const QgsPolygon * QgsPolyhedralSurface::patchN ( int i ) const

inline

Retrieves a patch from the polyhedral surface.

The first patch has index 0.

See also: numPatches()

Definition at line 157 of file qgspolyhedralsurface.h.

◆ perimeter()

double QgsPolyhedralSurface::perimeter ( ) const

overridevirtual

Returns the planar, 2-dimensional perimeter of the geometry.

Warning: QgsAbstractGeometry objects are inherently Cartesian/planar geometries, and the perimeter returned by this method is calculated using strictly Cartesian mathematics. In contrast, the QgsDistanceArea class exposes methods for calculating the perimeters of geometries using geodesic calculations which account for the curvature of the Earth (or any other celestial body).

See also: area(); length()

Reimplemented from QgsAbstractGeometry.

Definition at line 364 of file qgspolyhedralsurface.cpp.

◆ removeDuplicateNodes()

bool QgsPolyhedralSurface::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.

Implements QgsAbstractGeometry.

Definition at line 451 of file qgspolyhedralsurface.cpp.

◆ removePatch()

bool QgsPolyhedralSurface::removePatch ( int patchIndex )

Removes a patch from the polyhedral surface.

The first patch has index 0. The corresponding patch is removed from the polyhedral surface and deleted. If a patch was successfully removed the function will return true.

Definition at line 530 of file qgspolyhedralsurface.cpp.

◆ ringCount()

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

overridevirtual

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

Implements QgsAbstractGeometry.

Definition at line 790 of file qgspolyhedralsurface.cpp.

◆ segmentize()

QgsAbstractGeometry * QgsPolyhedralSurface::segmentize	(	double	tolerance = `M_PI_2 / 90`,
		SegmentationToleranceType	toleranceType = `MaximumAngle`
	)		const

overridevirtual

Returns a geometry without curves.

Caller takes ownership

Parameters

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

Reimplemented from QgsAbstractGeometry.

Definition at line 754 of file qgspolyhedralsurface.cpp.

◆ segmentLength()

double QgsPolyhedralSurface::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.

Implements QgsAbstractGeometry.

Definition at line 811 of file qgspolyhedralsurface.cpp.

◆ setPatches()

void QgsPolyhedralSurface::setPatches ( const QVector< QgsPolygon * > & patches )

virtual

Sets all patches, transferring ownership to the polyhedral surface.

Definition at line 492 of file qgspolyhedralsurface.cpp.

◆ simplifyByDistance()

QgsPolyhedralSurface * QgsPolyhedralSurface::simplifyByDistance ( double tolerance ) const

overridevirtual

Simplifies the geometry by applying the Douglas Peucker simplification by distance algorithm.

The caller takes ownership of the returned geometry. Curved geometries will be segmentized prior to simplification.

If a simplified geometry cannot be calculated nullptr will be returned.

The returned geometry may be invalid and contain self-intersecting rings.

Since: QGIS 3.38

Implements QgsAbstractGeometry.

Definition at line 437 of file qgspolyhedralsurface.cpp.

◆ snappedToGrid()

QgsPolyhedralSurface * QgsPolyhedralSurface::snappedToGrid	(	double	hSpacing,
		double	vSpacing,
		double	dSpacing = `0`,
		double	mSpacing = `0`,
		bool	removeRedundantPoints = `false`
	)		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.
removeRedundantPoints	if `true`, then points which are redundant (e.g. they represent mid points on a straight line segment) will be skipped (since QGIS 3.38)

Implements QgsAbstractGeometry.

Reimplemented in QgsTriangulatedSurface.

Definition at line 403 of file qgspolyhedralsurface.cpp.

◆ swapXy()

void QgsPolyhedralSurface::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 888 of file qgspolyhedralsurface.cpp.

◆ toCurveType()

QgsMultiSurface * QgsPolyhedralSurface::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 897 of file qgspolyhedralsurface.cpp.

◆ toMultiPolygon()

QgsMultiPolygon * QgsPolyhedralSurface::toMultiPolygon ( ) const

Converts a polyhedral surface to a multipolygon.

Caller takes ownership.

Definition at line 929 of file qgspolyhedralsurface.cpp.

◆ transform() [1/3]

void QgsPolyhedralSurface::transform	(	const QgsCoordinateTransform &	ct,
		Qgis::TransformDirection	d = `Qgis::TransformDirection::Forward`,
		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 566 of file qgspolyhedralsurface.cpp.

◆ transform() [2/3]

void QgsPolyhedralSurface::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 575 of file qgspolyhedralsurface.cpp.

◆ transform() [3/3]

bool QgsPolyhedralSurface::transform	(	QgsAbstractGeometryTransformer *	transformer,
		QgsFeedback *	feedback = `nullptr`
	)

overridevirtual

Transforms the vertices from the geometry in place, using the specified geometry transformer object.

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

The optional feedback argument can be used to cancel the transformation before it completes. If this is done, the geometry will be left in a semi-transformed state.

Returns: true if the geometry was successfully transformed.

Since: QGIS 3.18

Implements QgsAbstractGeometry.

Definition at line 908 of file qgspolyhedralsurface.cpp.

◆ transformVertices()

void QgsPolyhedralSurface::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 950 of file qgspolyhedralsurface.cpp.

◆ vertexAngle()

double QgsPolyhedralSurface::vertexAngle ( QgsVertexId vertex ) const

overridevirtual

Returns approximate rotation angle for a vertex.

Usually average angle between adjacent segments.

Parameters

vertex the vertex id

Returns: rotation in radians, clockwise from north

Implements QgsAbstractGeometry.

Definition at line 762 of file qgspolyhedralsurface.cpp.

◆ vertexAt()

QgsPoint QgsPolyhedralSurface::vertexAt ( QgsVertexId id ) const

overridevirtual

Returns the point corresponding to a specified vertex id.

Implements QgsAbstractGeometry.

Definition at line 803 of file qgspolyhedralsurface.cpp.

◆ vertexCount()

int QgsPolyhedralSurface::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 773 of file qgspolyhedralsurface.cpp.

◆ vertexNumberFromVertexId()

int QgsPolyhedralSurface::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.

Implements QgsAbstractGeometry.

Definition at line 610 of file qgspolyhedralsurface.cpp.

◆ wkbSize()

int QgsPolyhedralSurface::wkbSize ( QgsAbstractGeometry::WkbFlags flags = QgsAbstractGeometry::WkbFlags() ) const

overridevirtual

Returns the length of the QByteArray returned by asWkb()

The optional flags argument specifies flags controlling WKB export behavior

Since: QGIS 3.16

Implements QgsAbstractGeometry.

Definition at line 227 of file qgspolyhedralsurface.cpp.

Member Data Documentation

◆ mPatches

QVector< QgsPolygon * > QgsPolyhedralSurface::mPatches

protected

Definition at line 377 of file qgspolyhedralsurface.h.

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

/build/qgis-3.41.0+git20241126+3291e9ff48b+99sid/src/core/geometry/qgspolyhedralsurface.h
/build/qgis-3.41.0+git20241126+3291e9ff48b+99sid/src/core/geometry/qgspolyhedralsurface.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsPolyhedralSurface() [1/3]

◆ QgsPolyhedralSurface() [2/3]

◆ QgsPolyhedralSurface() [3/3]

◆ ~QgsPolyhedralSurface()

Member Function Documentation

◆ addMValue()

◆ addPatch()

◆ addZValue()

◆ adjacentVertices()

◆ area()

◆ asGml2()

◆ asGml3()

◆ asJsonObject()

◆ asKml()

◆ asQPainterPath()

◆ asWkb()

◆ asWkt()

◆ boundary()

◆ boundingBoxIntersects()

◆ calculateBoundingBox3D()

◆ cast()

◆ childCount()

◆ childGeometry()

◆ clear()

◆ clone()

◆ closestSegment()

◆ compareToSameClass()

◆ coordinateSequence()

◆ createEmptyWithSameType()

◆ deleteVertex()

◆ dimension()

◆ draw()

◆ dropMValue()

◆ dropZValue()

◆ filterVertices()

◆ fromWkb()

◆ fromWkt()

◆ fuzzyDistanceEqual()

◆ fuzzyEqual()

◆ geometryType()

◆ hasCurvedSegments()

◆ insertVertex()

◆ isEmpty()

◆ isValid()

◆ moveVertex()

◆ nCoordinates()

◆ nextVertex()

◆ normalize()

◆ numPatches()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ partCount()

◆ patchN() [1/2]

◆ patchN() [2/2]

◆ perimeter()

◆ removeDuplicateNodes()

◆ removePatch()

◆ ringCount()

◆ segmentize()

◆ segmentLength()

◆ setPatches()

◆ simplifyByDistance()

◆ snappedToGrid()

◆ swapXy()

◆ toCurveType()

◆ toMultiPolygon()

◆ transform() [1/3]

◆ transform() [2/3]

◆ transform() [3/3]

◆ transformVertices()

◆ vertexAngle()

◆ vertexAt()