QGIS API Documentation  3.1.0-Master (97726d6)
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsSurface Class Referenceabstract

#include <qgssurface.h>

Inheritance diagram for QgsSurface:
Inheritance graph
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Public Member Functions

QgsRectangle boundingBox () const override
 Returns the minimal bounding box for the geometry. More...
 
const QgsSurfacecast (const QgsAbstractGeometry *geom) const
 Cast the geom to a QgsSurface. More...
 
virtual QgsPolygonsurfaceToPolygon () const =0
 Gets a polygon representation of this surface. More...
 
- Public Member Functions inherited from QgsAbstractGeometry
 QgsAbstractGeometry ()=default
 Constructor for QgsAbstractGeometry. More...
 
 QgsAbstractGeometry (const QgsAbstractGeometry &geom)
 
virtual ~QgsAbstractGeometry ()=default
 
virtual bool addMValue (double mValue=0)=0
 Adds a measure to the geometry, initialized to a preset value. More...
 
virtual bool addZValue (double zValue=0)=0
 Adds a z-dimension to the geometry, initialized to a preset value. More...
 
virtual void adjacentVertices (QgsVertexId vertex, QgsVertexId &previousVertex, QgsVertexId &nextVertex) const =0
 Returns the vertices adjacent to a specified vertex within a geometry. More...
 
virtual double area () const
 Returns the area of the geometry. More...
 
virtual QDomElement asGml2 (QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
 Returns a GML2 representation of the geometry. More...
 
virtual QDomElement asGml3 (QDomDocument &doc, int precision=17, const QString &ns="gml", AxisOrder axisOrder=QgsAbstractGeometry::AxisOrder::XY) const =0
 Returns a GML3 representation of the geometry. More...
 
virtual QString asJson (int precision=17) const =0
 Returns a GeoJSON representation of the geometry. More...
 
virtual QByteArray asWkb () const =0
 Returns a WKB representation of the geometry. More...
 
virtual QString asWkt (int precision=17) const =0
 Returns a WKT representation of the geometry. More...
 
virtual QgsAbstractGeometryboundary () const =0
 Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). More...
 
virtual QgsPoint centroid () const
 Returns the centroid of the geometry. More...
 
virtual void clear ()=0
 Clears the geometry, ie reset it to a null geometry. More...
 
virtual QgsAbstractGeometryclone () const =0
 Clones the geometry by performing a deep copy. More...
 
virtual double closestSegment (const QgsPoint &pt, QgsPoint &segmentPt, QgsVertexId &vertexAfter, int *leftOf=nullptr, double epsilon=4 *std::numeric_limits< double >::epsilon()) const =0
 Searches for the closest segment of the geometry to a given point. More...
 
virtual bool convertTo (QgsWkbTypes::Type type)
 Converts the geometry to a specified type. More...
 
virtual QgsCoordinateSequence coordinateSequence () const =0
 Retrieves the sequence of geometries, rings and nodes. More...
 
virtual QgsAbstractGeometrycreateEmptyWithSameType () const =0
 Creates a new geometry with the same class and same WKB type as the original and transfers ownership. More...
 
virtual bool deleteVertex (QgsVertexId position)=0
 Deletes a vertex within the geometry. More...
 
virtual int dimension () const =0
 Returns the inherent dimension of the geometry. More...
 
virtual void draw (QPainter &p) const =0
 Draws the geometry using the specified QPainter. More...
 
virtual bool dropMValue ()=0
 Drops any measure values which exist in the geometry. More...
 
virtual bool dropZValue ()=0
 Drops any z-dimensions which exist in the geometry. More...
 
virtual void filterVertices (const std::function< bool(const QgsPoint &) > &filter)
 Filters the vertices from the geometry in place, removing any which do not return true for the filter function check. More...
 
virtual bool fromWkb (QgsConstWkbPtr &wkb)=0
 Sets the geometry from a WKB string. More...
 
virtual bool fromWkt (const QString &wkt)=0
 Sets the geometry from a WKT string. More...
 
virtual QString geometryType () const =0
 Returns a unique string representing the geometry type. More...
 
virtual bool hasCurvedSegments () const
 Returns true if the geometry contains curved segments. More...
 
virtual bool insertVertex (QgsVertexId position, const QgsPoint &vertex)=0
 Inserts a vertex into the geometry. More...
 
bool is3D () const
 Returns true if the geometry is 3D and contains a z-value. More...
 
virtual bool isEmpty () const
 Returns true if the geometry is empty. More...
 
bool isMeasure () const
 Returns true if the geometry contains m values. More...
 
virtual double length () const
 Returns the length of the geometry. More...
 
virtual bool moveVertex (QgsVertexId position, const QgsPoint &newPos)=0
 Moves a vertex within the geometry. More...
 
virtual int nCoordinates () const
 Returns the number of nodes contained in the geometry. More...
 
virtual bool nextVertex (QgsVertexId &id, QgsPoint &vertex) const =0
 Returns next vertex id and coordinates. More...
 
virtual bool operator!= (const QgsAbstractGeometry &other) const =0
 
QgsAbstractGeometryoperator= (const QgsAbstractGeometry &geom)
 
virtual bool operator== (const QgsAbstractGeometry &other) const =0
 
virtual int partCount () const =0
 Returns count of parts contained in the geometry. More...
 
virtual double perimeter () const
 Returns the perimeter of the geometry. More...
 
virtual bool removeDuplicateNodes (double epsilon=4 *std::numeric_limits< double >::epsilon(), bool useZValues=false)=0
 Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry. More...
 
virtual int ringCount (int part=0) const =0
 Returns the number of rings of which this geometry is built. More...
 
virtual QgsAbstractGeometrysegmentize (double tolerance=M_PI/180., SegmentationToleranceType toleranceType=MaximumAngle) const
 Returns a version of the geometry without curves. More...
 
virtual double segmentLength (QgsVertexId startVertex) const =0
 Returns the length of the segment of the geometry which begins at startVertex. More...
 
virtual QgsAbstractGeometrysnappedToGrid (double hSpacing, double vSpacing, double dSpacing=0, double mSpacing=0) const =0
 Makes a new geometry with all the points or vertices snapped to the closest point of the grid. More...
 
virtual void swapXy ()=0
 Swaps the x and y coordinates from the geometry. More...
 
virtual QgsAbstractGeometrytoCurveType () const =0
 Returns the geometry converted to the more generic curve type. More...
 
virtual void transform (const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d=QgsCoordinateTransform::ForwardTransform, bool transformZ=false) SIP_THROW(QgsCsException)=0
 Transforms the geometry using a coordinate transform. More...
 
virtual void transform (const QTransform &t, double zTranslate=0.0, double zScale=1.0, double mTranslate=0.0, double mScale=1.0)=0
 Transforms the x and y components of the geometry using a QTransform object t. More...
 
virtual double vertexAngle (QgsVertexId vertex) const =0
 Returns approximate angle at a vertex. More...
 
virtual QgsPoint vertexAt (QgsVertexId id) const =0
 Returns the point corresponding to a specified vertex id. More...
 
virtual int vertexCount (int part=0, int ring=0) const =0
 Returns the number of vertices of which this geometry is built. More...
 
virtual int vertexNumberFromVertexId (QgsVertexId id) const =0
 Returns the vertex number corresponding to a vertex id. More...
 
QgsVertexIterator vertices () const
 Returns 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...
 

Protected Member Functions

void clearCache () const override
 Clears any cached parameters associated with the geometry, e.g., bounding boxes. More...
 
- Protected Member Functions inherited from QgsAbstractGeometry
virtual QgsRectangle calculateBoundingBox () const
 Default calculator for the minimal bounding box for the geometry. More...
 
virtual int childCount () const
 Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e. More...
 
virtual QgsAbstractGeometrychildGeometry (int index) const
 Returns pointer to child geometry (for geometries with child geometries - i.e. More...
 
virtual QgsPoint childPoint (int index) const
 Returns point at index (for geometries without child geometries - i.e. More...
 
virtual 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

QgsRectangle mBoundingBox
 
- Protected Attributes inherited from QgsAbstractGeometry
QgsWkbTypes::Type mWkbType = QgsWkbTypes::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...
 

Detailed Description

Definition at line 32 of file qgssurface.h.

Member Function Documentation

◆ boundingBox()

QgsRectangle QgsSurface::boundingBox ( ) const
inlineoverridevirtual

Returns the minimal bounding box for the geometry.

Implements QgsAbstractGeometry.

Definition at line 45 of file qgssurface.h.

◆ cast()

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

Cast the geom to a QgsSurface.

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

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

Definition at line 63 of file qgssurface.h.

◆ clearCache()

void QgsSurface::clearCache ( ) const
inlineoverrideprotectedvirtual

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

Reimplemented from QgsAbstractGeometry.

Definition at line 78 of file qgssurface.h.

◆ surfaceToPolygon()

virtual QgsPolygon* QgsSurface::surfaceToPolygon ( ) const
pure virtual

Gets a polygon representation of this surface.

Ownership is transferred to the caller.

Implemented in QgsTriangle, QgsCurvePolygon, and QgsPolygon.

Member Data Documentation

◆ mBoundingBox

QgsRectangle QgsSurface::mBoundingBox
mutableprotected

Definition at line 80 of file qgssurface.h.


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