QGIS API Documentation  3.3.0-Master (c515a66)
Public Member Functions | List of all members
QgsMultiCurve Class Reference

Multi curve geometry collection. More...

#include <qgsmulticurve.h>

Inheritance diagram for QgsMultiCurve:
Inheritance graph
[legend]

Public Member Functions

 QgsMultiCurve ()
 
bool addGeometry (QgsAbstractGeometry *g) override
 Adds a geometry and takes ownership. Returns true in case of success. 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...
 
QString asJson (int precision=17) const override
 Returns a GeoJSON representation of the geometry. More...
 
QgsAbstractGeometryboundary () const override
 Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). More...
 
const QgsMultiCurvecast (const QgsAbstractGeometry *geom) const
 Cast the geom to a QgsMultiCurve. More...
 
void clear () override
 Clears the geometry, ie reset it to a null geometry. More...
 
QgsMultiCurveclone () const override
 Clones the geometry by performing a deep copy. More...
 
QgsMultiCurvecreateEmptyWithSameType () const override
 Creates a new geometry with the same class and same WKB type as the original and transfers ownership. 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...
 
bool insertGeometry (QgsAbstractGeometry *g, int index) override
 Inserts a geometry before a specified index and takes ownership. More...
 
QgsMultiCurvereversed () const
 Returns a copy of the multi curve, where each component curve has had its line direction reversed. More...
 
QgsMultiCurvetoCurveType () const override
 Returns the geometry converted to the more generic curve type. More...
 
- Public Member Functions inherited from QgsGeometryCollection
 QgsGeometryCollection ()
 
 QgsGeometryCollection (const QgsGeometryCollection &c)
 
 ~QgsGeometryCollection () override
 
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...
 
double area () const override
 Returns the area of the geometry. More...
 
QByteArray asWkb () const override
 Returns a WKB representation of the geometry. More...
 
QString asWkt (int precision=17) const override
 Returns a WKT representation of the geometry. More...
 
QgsRectangle boundingBox () const override
 Returns the minimal bounding box for the geometry. More...
 
const QgsGeometryCollectioncast (const QgsAbstractGeometry *geom) const
 Cast the geom to a QgsGeometryCollection. 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...
 
QgsCoordinateSequence coordinateSequence () const override
 Retrieves the sequence of geometries, rings and nodes. 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...
 
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...
 
const QgsAbstractGeometrygeometryN (int n) const
 Returns a const reference to a geometry from within the collection. More...
 
QgsAbstractGeometrygeometryN (int n)
 Returns a geometry from within the collection. More...
 
bool hasCurvedSegments () const override
 Returns true if the geometry contains curved segments. 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...
 
double length () const override
 Returns the length of the geometry. 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...
 
int numGeometries () const
 Returns the number of geometries within the collection. More...
 
bool operator!= (const QgsAbstractGeometry &other) const override
 
QgsGeometryCollectionoperator= (const QgsGeometryCollection &c)
 
bool operator== (const QgsAbstractGeometry &other) const override
 
int partCount () const override
 Returns count of parts contained in the geometry. More...
 
double perimeter () const override
 Returns the perimeter of the geometry. 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...
 
virtual bool removeGeometry (int nr)
 Removes a geometry from the collection. More...
 
int ringCount (int part=0) const override
 Returns the number of rings of which this geometry is built. More...
 
QgsAbstractGeometrysegmentize (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const override
 Returns a geometry without curves. More...
 
double segmentLength (QgsVertexId startVertex) const override
 Returns the length of the segment of the geometry which begins at startVertex. More...
 
QgsGeometryCollectionsnappedToGrid (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...
 
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
 Returns approximate angle at a vertex. More...
 
QgsPoint vertexAt (QgsVertexId id) const override
 Returns the point corresponding to a specified vertex id. More...
 
int vertexCount (int part=0, int ring=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...
 
- Public Member Functions inherited from QgsAbstractGeometry
 QgsAbstractGeometry ()=default
 Constructor for QgsAbstractGeometry. More...
 
 QgsAbstractGeometry (const QgsAbstractGeometry &geom)
 
virtual ~QgsAbstractGeometry ()=default
 
virtual QgsPoint centroid () const
 Returns the centroid of the geometry. More...
 
virtual bool convertTo (QgsWkbTypes::Type type)
 Converts the geometry to a specified type. 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...
 
QgsAbstractGeometryoperator= (const QgsAbstractGeometry &geom)
 
QgsVertexIterator vertices () const
 Returns Java-style iterator for traversal of vertices of the geometry. 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...
 

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...
 
- Protected Member Functions inherited from QgsGeometryCollection
QgsRectangle calculateBoundingBox () const override
 Default calculator for the minimal bounding box for the geometry. More...
 
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...
 
QgsAbstractGeometrychildGeometry (int index) const override
 Returns pointer to child geometry (for geometries with child geometries - i.e. More...
 
void clearCache () const override
 Clears any cached parameters associated with the geometry, e.g., bounding boxes. More...
 
bool fromCollectionWkt (const QString &wkt, const QVector< QgsAbstractGeometry *> &subtypes, const QString &defaultChildWkbType=QString())
 Reads a collection from a WKT string. More...
 
virtual bool wktOmitChildType () const
 Returns whether child type names are omitted from Wkt representations of the collection. More...
 
- Protected Member Functions inherited from QgsAbstractGeometry
virtual QgsPoint childPoint (int index) const
 Returns point at index (for geometries without child geometries - i.e. More...
 
virtual bool hasChildGeometries () const
 Returns whether the geometry has any child geometries (false for point / curve, true otherwise) More...
 
void setZMTypeFromSubGeometry (const QgsAbstractGeometry *subggeom, QgsWkbTypes::Type baseGeomType)
 Updates the geometry type based on whether sub geometries contain z or m values. More...
 
- Protected Attributes inherited from QgsGeometryCollection
QVector< QgsAbstractGeometry *> mGeometries
 
- Protected Attributes inherited from QgsAbstractGeometry
QgsWkbTypes::Type mWkbType = QgsWkbTypes::Unknown
 

Detailed Description

Multi curve geometry collection.

Since
QGIS 2.10

Definition at line 29 of file qgsmulticurve.h.

Constructor & Destructor Documentation

◆ QgsMultiCurve()

QgsMultiCurve::QgsMultiCurve ( )

Definition at line 26 of file qgsmulticurve.cpp.

Member Function Documentation

◆ addGeometry()

bool QgsMultiCurve::addGeometry ( QgsAbstractGeometry g)
overridevirtual

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

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 133 of file qgsmulticurve.cpp.

◆ asGml2()

QDomElement QgsMultiCurve::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
docDOM document
precisionnumber of decimal places for coordinates
nsXML namespace
axisOrderAxis order for generated GML
See also
asWkb()
asWkt()
asGml3()
asJson()

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 66 of file qgsmulticurve.cpp.

◆ asGml3()

QDomElement QgsMultiCurve::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
docDOM document
precisionnumber of decimal places for coordinates
nsXML namespace
axisOrderAxis order for generated GML
See also
asWkb()
asWkt()
asGml2()
asJson()

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 89 of file qgsmulticurve.cpp.

◆ asJson()

QString QgsMultiCurve::asJson ( int  precision = 17) const
overridevirtual

Returns a GeoJSON representation of the geometry.

Parameters
precisionnumber of decimal places for coordinates
See also
asWkb()
asWkt()
asGml2()
asGml3()

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 111 of file qgsmulticurve.cpp.

◆ boundary()

QgsAbstractGeometry * QgsMultiCurve::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 null for some geometry types.
Since
QGIS 3.0

Reimplemented from QgsGeometryCollection.

Definition at line 181 of file qgsmulticurve.cpp.

◆ cast()

const QgsMultiCurve* QgsMultiCurve::cast ( const QgsAbstractGeometry geom) const
inline

Cast the geom to a QgsMultiCurve.

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

Note
Not available in Python. Objects will be automatically be converted to the appropriate target type.
Since
QGIS 3.0

Definition at line 61 of file qgsmulticurve.h.

◆ clear()

void QgsMultiCurve::clear ( )
overridevirtual

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

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 48 of file qgsmulticurve.cpp.

◆ clone()

QgsMultiCurve * QgsMultiCurve::clone ( ) const
overridevirtual

Clones the geometry by performing a deep copy.

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 43 of file qgsmulticurve.cpp.

◆ createEmptyWithSameType()

QgsMultiCurve * QgsMultiCurve::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

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 36 of file qgsmulticurve.cpp.

◆ fromWkt()

bool QgsMultiCurve::fromWkt ( const QString &  wkt)
overridevirtual

Sets the geometry from a WKT string.

See also
fromWkb

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 59 of file qgsmulticurve.cpp.

◆ geometryType()

QString QgsMultiCurve::geometryType ( ) const
overridevirtual

Returns a unique string representing the geometry type.

See also
wkbType
wktTypeStr

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 31 of file qgsmulticurve.cpp.

◆ insertGeometry()

bool QgsMultiCurve::insertGeometry ( QgsAbstractGeometry g,
int  index 
)
overridevirtual

Inserts a geometry before a specified index and takes ownership.

Returns true in case of success.

Parameters
ggeometry to insert. Ownership is transferred to the collection.
indexposition to insert geometry before

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 157 of file qgsmulticurve.cpp.

◆ reversed()

QgsMultiCurve * QgsMultiCurve::reversed ( ) const

Returns a copy of the multi curve, where each component curve has had its line direction reversed.

Since
QGIS 2.14

Definition at line 168 of file qgsmulticurve.cpp.

◆ toCurveType()

QgsMultiCurve * QgsMultiCurve::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

Reimplemented from QgsGeometryCollection.

Reimplemented in QgsMultiLineString.

Definition at line 54 of file qgsmulticurve.cpp.


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