QGIS API Documentation  3.3.0-Master (1bf63f1)
Public Member Functions | Friends | List of all members
QgsPolygon Class Reference

Polygon geometry type. More...

#include <qgspolygon.h>

Inheritance diagram for QgsPolygon:
Inheritance graph
[legend]

Public Member Functions

 QgsPolygon ()
 
void addInteriorRing (QgsCurve *ring) override
 Adds an interior ring to the geometry (takes ownership) More...
 
QByteArray asWkb () const override
 Returns a WKB 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 QgsPolygoncast (const QgsAbstractGeometry *geom) const
 Cast the geom to a QgsPolygonV2. More...
 
void clear () override
 Clears the geometry, ie reset it to a null geometry. More...
 
QgsPolygonclone () const override
 Clones the geometry by performing a deep copy. More...
 
QgsPolygoncreateEmptyWithSameType () const override
 Creates a new geometry with the same class and same WKB type as the original and transfers ownership. More...
 
bool fromWkb (QgsConstWkbPtr &wkb) override
 Sets the geometry from a WKB string. More...
 
QString geometryType () const override
 Returns a unique string representing the geometry type. More...
 
double pointDistanceToBoundary (double x, double y) const
 Returns the distance from a point to the boundary of the polygon (either the exterior ring or any closer interior rings). More...
 
void setExteriorRing (QgsCurve *ring) override
 Sets the exterior ring of the polygon. More...
 
QgsPolygonsurfaceToPolygon () const override
 Gets a polygon representation of this surface. More...
 
QgsCurvePolygontoCurveType () const override
 Returns the geometry converted to the more generic curve type QgsCurvePolygon. More...
 
- Public Member Functions inherited from QgsCurvePolygon
 QgsCurvePolygon ()
 
 QgsCurvePolygon (const QgsCurvePolygon &p)
 
 ~QgsCurvePolygon () 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...
 
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...
 
QString asWkt (int precision=17) const override
 Returns a WKT representation of the geometry. More...
 
const QgsCurvePolygoncast (const QgsAbstractGeometry *geom) const
 Cast the geom to a QgsCurvePolygon. 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...
 
const QgsCurveexteriorRing () const
 
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 fromWkt (const QString &wkt) override
 Sets the geometry from a WKT string. 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...
 
const QgsCurveinteriorRing (int i) const
 
bool isEmpty () const override
 Returns true if the geometry is empty. 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 numInteriorRings () const
 
bool operator!= (const QgsAbstractGeometry &other) const override
 
QgsCurvePolygonoperator= (const QgsCurvePolygon &p)
 
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...
 
bool removeInteriorRing (int ringIndex)
 Removes an interior ring from the polygon. More...
 
void removeInteriorRings (double minimumAllowedArea=-1)
 Removes the interior rings from the polygon. More...
 
void removeInvalidRings ()
 Removes any interior rings which are not valid from the polygon. 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...
 
void setInteriorRings (const QVector< QgsCurve *> &rings)
 Sets all interior rings (takes ownership) More...
 
QgsCurvePolygonsnappedToGrid (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...
 
virtual QgsPolygontoPolygon (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const
 Returns a new polygon geometry corresponding to a segmentized approximation of the curve. 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 rotation angle for 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 QgsSurface
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...
 
- 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...
 
virtual double length () const
 Returns the length of the geometry. 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...
 

Friends

class QgsCurvePolygon
 

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 QgsCurvePolygon
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...
 
- Protected Member Functions inherited from QgsSurface
void clearCache () const override
 Clears any cached parameters associated with the geometry, e.g., bounding boxes. 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 QgsCurvePolygon
std::unique_ptr< QgsCurvemExteriorRing
 
QVector< QgsCurve * > mInteriorRings
 
- Protected Attributes inherited from QgsSurface
QgsRectangle mBoundingBox
 
- Protected Attributes inherited from QgsAbstractGeometry
QgsWkbTypes::Type mWkbType = QgsWkbTypes::Unknown
 

Detailed Description

Polygon geometry type.

Since
QGIS 2.10

Definition at line 31 of file qgspolygon.h.

Constructor & Destructor Documentation

◆ QgsPolygon()

QgsPolygon::QgsPolygon ( )

Definition at line 25 of file qgspolygon.cpp.

Member Function Documentation

◆ addInteriorRing()

void QgsPolygon::addInteriorRing ( QgsCurve ring)
overridevirtual

Adds an interior ring to the geometry (takes ownership)

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 148 of file qgspolygon.cpp.

◆ asWkb()

QByteArray QgsPolygon::asWkb ( ) const
overridevirtual

Returns a WKB representation of the geometry.

See also
asWkt
asGml2
asGml3
asJson()
Since
QGIS 3.0

Reimplemented from QgsCurvePolygon.

Definition at line 112 of file qgspolygon.cpp.

◆ boundary()

QgsAbstractGeometry * QgsPolygon::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 QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 214 of file qgspolygon.cpp.

◆ cast()

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

Cast the geom to a QgsPolygonV2.

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

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

Definition at line 71 of file qgspolygon.h.

◆ clear()

void QgsPolygon::clear ( )
overridevirtual

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

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 47 of file qgspolygon.cpp.

◆ clone()

QgsPolygon * QgsPolygon::clone ( ) const
overridevirtual

Clones the geometry by performing a deep copy.

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 42 of file qgspolygon.cpp.

◆ createEmptyWithSameType()

QgsPolygon * QgsPolygon::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 QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 35 of file qgspolygon.cpp.

◆ fromWkb()

bool QgsPolygon::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

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 53 of file qgspolygon.cpp.

◆ geometryType()

QString QgsPolygon::geometryType ( ) const
overridevirtual

Returns a unique string representing the geometry type.

See also
wkbType
wktTypeStr

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 30 of file qgspolygon.cpp.

◆ pointDistanceToBoundary()

double QgsPolygon::pointDistanceToBoundary ( double  x,
double  y 
) const

Returns the distance from a point to the boundary of the polygon (either the exterior ring or any closer interior rings).

The returned distance will be negative if the point lies outside the polygon.

Since
QGIS 3.0

Definition at line 236 of file qgspolygon.cpp.

◆ setExteriorRing()

void QgsPolygon::setExteriorRing ( QgsCurve ring)
overridevirtual

Sets the exterior ring of the polygon.

The CurvePolygon type will be updated to match the dimensionality of the exterior ring. For instance, setting a 2D exterior ring on a 3D CurvePolygon will drop the z dimension from the CurvePolygon and all interior rings.

Parameters
ringnew exterior ring. Ownership is transferred to the CurvePolygon.
See also
setInteriorRings()
exteriorRing()

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 179 of file qgspolygon.cpp.

◆ surfaceToPolygon()

QgsPolygon * QgsPolygon::surfaceToPolygon ( ) const
overridevirtual

Gets a polygon representation of this surface.

Ownership is transferred to the caller.

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 270 of file qgspolygon.cpp.

◆ toCurveType()

QgsCurvePolygon * QgsPolygon::toCurveType ( ) const
overridevirtual

Returns the geometry converted to the more generic curve type QgsCurvePolygon.

Returns
the converted geometry. Caller takes ownership

Reimplemented from QgsCurvePolygon.

Reimplemented in QgsTriangle.

Definition at line 275 of file qgspolygon.cpp.

Friends And Related Function Documentation

◆ QgsCurvePolygon

friend class QgsCurvePolygon
friend

Definition at line 97 of file qgspolygon.h.


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