QGIS API Documentation 3.41.0-Master (092dc69654e)
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Multi polygon geometry collection. More...
#include <qgsmultipolygon.h>
Public Member Functions | |
QgsMultiPolygon () | |
Constructor for an empty multipolygon geometry. | |
QgsMultiPolygon (const QList< QgsPolygon * > &polygons) | |
Constructor for a multipolygon containing the specified polygons. | |
QgsMultiPolygon (const QList< QgsPolygon > &polygons) | |
Constructor for a multipolygon containing the specified polygons. | |
bool | addGeometries (const QVector< QgsAbstractGeometry * > &geometries) final |
Adds a list of geometries to the collection, transferring ownership to the collection. | |
bool | addGeometry (QgsAbstractGeometry *g) override |
Adds a geometry and takes ownership. Returns true in case of success. | |
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. | |
QgsAbstractGeometry * | boundary () const override |
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). | |
void | clear () override |
Clears the geometry, ie reset it to a null geometry. | |
QgsMultiPolygon * | clone () const override |
Clones the geometry by performing a deep copy. | |
QgsMultiPolygon * | createEmptyWithSameType () const override |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership. | |
bool | fromWkt (const QString &wkt) override |
Sets the geometry from a WKT string. | |
QString | geometryType () const override |
Returns a unique string representing the geometry type. | |
bool | insertGeometry (QgsAbstractGeometry *g, int index) override |
Inserts a geometry before a specified index and takes ownership. | |
QgsPolygon * | polygonN (int index) |
Returns the polygon with the specified index. | |
const QgsPolygon * | polygonN (int index) const |
Returns the polygon with the specified index. | |
QgsMultiPolygon * | simplifyByDistance (double tolerance) const override |
Simplifies the geometry by applying the Douglas Peucker simplification by distance algorithm. | |
QgsMultiSurface * | toCurveType () const override |
Returns the geometry converted to the more generic curve type QgsMultiSurface. | |
Public Member Functions inherited from QgsMultiSurface | |
QgsMultiSurface () | |
Constructor for an empty multisurface geometry. | |
bool | addGeometries (const QVector< QgsAbstractGeometry * > &geometries) override |
Adds a list of geometries to the collection, transferring ownership to the collection. | |
bool | addGeometry (QgsAbstractGeometry *g) override |
Adds a geometry and takes ownership. Returns true in case of success. | |
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. | |
QgsAbstractGeometry * | boundary () const override |
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). | |
void | clear () override |
Clears the geometry, ie reset it to a null geometry. | |
QgsMultiSurface * | clone () const override |
Clones the geometry by performing a deep copy. | |
QgsMultiSurface * | createEmptyWithSameType () const override |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership. | |
bool | fromWkt (const QString &wkt) override |
Sets the geometry from a WKT string. | |
QString | geometryType () const override |
Returns a unique string representing the geometry type. | |
bool | insertGeometry (QgsAbstractGeometry *g, int index) override |
Inserts a geometry before a specified index and takes ownership. | |
QgsMultiSurface * | simplifyByDistance (double tolerance) const override |
Simplifies the geometry by applying the Douglas Peucker simplification by distance algorithm. | |
QgsSurface * | surfaceN (int index) |
Returns the surface with the specified index. | |
const QgsSurface * | surfaceN (int index) const |
Returns the surface with the specified index. | |
QgsMultiSurface * | toCurveType () const override |
Returns the geometry converted to the more generic curve type. | |
Public Member Functions inherited from QgsGeometryCollection | |
QgsGeometryCollection () | |
Constructor for an empty geometry collection. | |
QgsGeometryCollection (const QgsGeometryCollection &c) | |
~QgsGeometryCollection () override | |
bool | addMValue (double mValue=0) override |
Adds a measure to the geometry, initialized to a preset value. | |
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. | |
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. | |
QgsBox3D | boundingBox3D () const override |
Returns the 3D bounding box for the geometry. | |
bool | boundingBoxIntersects (const QgsBox3D &box3d) const override |
Returns true if the bounding box of this geometry intersects with a box3d. | |
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. | |
bool | deleteVertex (QgsVertexId position) override |
Deletes a vertex within the geometry. | |
int | dimension () const override |
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. | |
QgsGeometryCollection * | extractPartsByType (Qgis::WkbType type, bool useFlatType=true) const |
Returns a new QgsGeometryCollection subclass which consists of the parts of this collection which match the specified WKB type. | |
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 | 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. | |
QgsAbstractGeometry * | geometryN (int n) |
Returns a geometry from within the collection. | |
const QgsAbstractGeometry * | geometryN (int n) const |
Returns a const reference to a geometry from within the collection. | |
bool | hasCurvedSegments () const override |
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. | |
double | length () const override |
Returns the planar, 2-dimensional length of the geometry. | |
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 () final |
Reorganizes the geometry into a normalized form (or "canonical" form). | |
int | numGeometries () const |
Returns the number of geometries within the collection. | |
bool | operator!= (const QgsAbstractGeometry &other) const override |
QgsGeometryCollection & | operator= (const QgsGeometryCollection &c) |
bool | operator== (const QgsAbstractGeometry &other) const override |
int | partCount () const override |
Returns count of parts contained in the geometry. | |
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. | |
virtual bool | removeGeometry (int nr) |
Removes a geometry from the collection. | |
void | reserve (int size) |
Attempts to allocate memory for at least size geometries. | |
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. | |
const QgsAbstractGeometry * | simplifiedTypeRef () const override |
Returns a reference to the simplest lossless representation of this geometry, e.g. | |
QgsGeometryCollection * | 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. | |
QVector< QgsAbstractGeometry * > | takeGeometries () |
Removes all geometries from the collection, returning them and their ownership to the caller. | |
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 angle at 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 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. | |
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. | |
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 QgsMultiPolygon * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsMultiPolygonV2. | |
Static Public Member Functions inherited from QgsMultiSurface | |
static const QgsMultiSurface * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsMultiSurface. | |
Static Public Member Functions inherited from QgsGeometryCollection | |
static const QgsGeometryCollection * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsGeometryCollection. | |
Protected Member Functions | |
bool | wktOmitChildType () const override |
Returns whether child type names are omitted from Wkt representations of the collection. | |
Protected Member Functions inherited from QgsGeometryCollection | |
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. | |
void | clearCache () const override |
Clears any cached parameters associated with the geometry, e.g., bounding boxes. | |
int | compareToSameClass (const QgsAbstractGeometry *other) const final |
Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries. | |
bool | fromCollectionWkt (const QString &wkt, const QVector< QgsAbstractGeometry * > &subtypes, const QString &defaultChildWkbType=QString()) |
Reads a collection from a WKT string. | |
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. | |
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 |
Protected Attributes inherited from QgsGeometryCollection | |
QVector< QgsAbstractGeometry * > | mGeometries |
Protected Attributes inherited from QgsAbstractGeometry | |
Qgis::WkbType | mWkbType = Qgis::WkbType::Unknown |
Multi polygon geometry collection.
Definition at line 30 of file qgsmultipolygon.h.
QgsMultiPolygon::QgsMultiPolygon | ( | ) |
Constructor for an empty multipolygon geometry.
Definition at line 26 of file qgsmultipolygon.cpp.
QgsMultiPolygon::QgsMultiPolygon | ( | const QList< QgsPolygon > & | polygons | ) |
Constructor for a multipolygon containing the specified polygons.
The polygons will be internally cloned.
Definition at line 31 of file qgsmultipolygon.cpp.
QgsMultiPolygon::QgsMultiPolygon | ( | const QList< QgsPolygon * > & | polygons | ) |
Constructor for a multipolygon containing the specified polygons.
Ownership of the polygons will be transferred to the multipolygon.
Definition at line 45 of file qgsmultipolygon.cpp.
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finalvirtual |
Adds a list of geometries to the collection, transferring ownership to the collection.
Returns true
in case of success.
Reimplemented from QgsGeometryCollection.
Definition at line 195 of file qgsmultipolygon.cpp.
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overridevirtual |
Adds a geometry and takes ownership. Returns true
in case of success.
Reimplemented from QgsGeometryCollection.
Definition at line 171 of file qgsmultipolygon.cpp.
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overridevirtual |
Returns a GML2 representation of the geometry.
doc | DOM document |
precision | number of decimal places for coordinates |
ns | XML namespace |
axisOrder | Axis order for generated GML |
Reimplemented from QgsGeometryCollection.
Definition at line 97 of file qgsmultipolygon.cpp.
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overridevirtual |
Returns a GML3 representation of the geometry.
doc | DOM document |
precision | number of decimal places for coordinates |
ns | XML namespace |
axisOrder | Axis order for generated GML |
Reimplemented from QgsGeometryCollection.
Definition at line 118 of file qgsmultipolygon.cpp.
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overridevirtual |
Returns a json object representation of the geometry.
Reimplemented from QgsGeometryCollection.
Definition at line 138 of file qgsmultipolygon.cpp.
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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.
nullptr
for some geometry types. Reimplemented from QgsGeometryCollection.
Definition at line 261 of file qgsmultipolygon.cpp.
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inlinestatic |
Cast the geom to a QgsMultiPolygonV2.
Should be used by qgsgeometry_cast<QgsMultiPolygon *>( geometry ).
Definition at line 127 of file qgsmultipolygon.h.
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overridevirtual |
Clears the geometry, ie reset it to a null geometry.
Reimplemented from QgsGeometryCollection.
Definition at line 74 of file qgsmultipolygon.cpp.
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overridevirtual |
Clones the geometry by performing a deep copy.
Reimplemented from QgsGeometryCollection.
Definition at line 87 of file qgsmultipolygon.cpp.
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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.
Reimplemented from QgsGeometryCollection.
Definition at line 80 of file qgsmultipolygon.cpp.
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overridevirtual |
Sets the geometry from a WKT string.
Reimplemented from QgsGeometryCollection.
Definition at line 92 of file qgsmultipolygon.cpp.
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overridevirtual |
Returns a unique string representing the geometry type.
Reimplemented from QgsGeometryCollection.
Definition at line 69 of file qgsmultipolygon.cpp.
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overridevirtual |
Inserts a geometry before a specified index and takes ownership.
Returns true
in case of success.
g | geometry to insert. Ownership is transferred to the collection. |
index | position to insert geometry before |
Reimplemented from QgsGeometryCollection.
Definition at line 228 of file qgsmultipolygon.cpp.
QgsPolygon * QgsMultiPolygon::polygonN | ( | int | index | ) |
Returns the polygon with the specified index.
Definition at line 59 of file qgsmultipolygon.cpp.
const QgsPolygon * QgsMultiPolygon::polygonN | ( | int | index | ) | const |
Returns the polygon with the specified index.
Definition at line 64 of file qgsmultipolygon.cpp.
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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.
Reimplemented from QgsGeometryCollection.
Definition at line 239 of file qgsmultipolygon.cpp.
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overridevirtual |
Returns the geometry converted to the more generic curve type QgsMultiSurface.
Reimplemented from QgsGeometryCollection.
Definition at line 250 of file qgsmultipolygon.cpp.
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overrideprotectedvirtual |
Returns whether child type names are omitted from Wkt representations of the collection.
Reimplemented from QgsGeometryCollection.
Definition at line 296 of file qgsmultipolygon.cpp.