QGIS API Documentation
3.26.3-Buenos Aires (65e4edfdad)
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Geometry collection. More...
#include <qgsgeometrycollection.h>
Public Member Functions | |
QgsGeometryCollection () SIP_HOLDGIL | |
Constructor for an empty geometry collection. More... | |
QgsGeometryCollection (const QgsGeometryCollection &c) | |
~QgsGeometryCollection () override | |
virtual bool | addGeometry (QgsAbstractGeometry *g) |
Adds a geometry and takes ownership. Returns true in case of success. More... | |
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 SIP_HOLDGIL |
Returns the planar, 2-dimensional 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... | |
json | asJsonObject (int precision=17) const override |
Returns a json object representation of the geometry. More... | |
QString | asKml (int precision=17) const override |
Returns a KML representation of the geometry. More... | |
QPainterPath | asQPainterPath () const override |
Returns the geometry represented as a QPainterPath. More... | |
QByteArray | asWkb (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override |
QString | asWkt (int precision=17) const override |
Returns a WKT representation of the geometry. More... | |
QgsAbstractGeometry * | boundary () const override |
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). More... | |
QgsRectangle | boundingBox () const override |
Returns the minimal bounding box for the geometry. More... | |
bool | boundingBoxIntersects (const QgsRectangle &rectangle) const override SIP_HOLDGIL |
Returns true if the bounding box of this geometry intersects with a rectangle. More... | |
void | clear () override |
Clears the geometry, ie reset it to a null geometry. More... | |
QgsGeometryCollection * | clone () const override |
Clones the geometry by performing a deep copy. 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... | |
QgsGeometryCollection * | createEmptyWithSameType () const override |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership. More... | |
bool | deleteVertex (QgsVertexId position) override |
Deletes a vertex within the geometry. More... | |
int | dimension () const override SIP_HOLDGIL |
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... | |
bool | fromWkt (const QString &wkt) override |
Sets the geometry from a WKT string. More... | |
const QgsAbstractGeometry * | geometryN (int n) const |
Returns a const reference to a geometry from within the collection. More... | |
QgsAbstractGeometry * | geometryN (int n) SIP_HOLDGIL |
Returns a geometry from within the collection. More... | |
QString | geometryType () const override SIP_HOLDGIL |
Returns a unique string representing the geometry type. More... | |
bool | hasCurvedSegments () const override SIP_HOLDGIL |
Returns true if the geometry contains curved segments. More... | |
virtual bool | insertGeometry (QgsAbstractGeometry *g, int index) |
Inserts a geometry before a specified index and takes ownership. More... | |
bool | insertVertex (QgsVertexId position, const QgsPoint &vertex) override |
Inserts a vertex into the geometry. More... | |
bool | isEmpty () const override SIP_HOLDGIL |
Returns true if the geometry is empty. More... | |
bool | isValid (QString &error, Qgis::GeometryValidityFlags flags=Qgis::GeometryValidityFlags()) const override |
Checks validity of the geometry, and returns true if the geometry is valid. More... | |
double | length () const override SIP_HOLDGIL |
Returns the planar, 2-dimensional 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... | |
void | normalize () final SIP_HOLDGIL |
Reorganizes the geometry into a normalized form (or "canonical" form). More... | |
int | numGeometries () const SIP_HOLDGIL |
Returns the number of geometries within the collection. More... | |
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. More... | |
double | perimeter () const override SIP_HOLDGIL |
Returns the planar, 2-dimensional 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... | |
void | reserve (int size) SIP_HOLDGIL |
Attempts to allocate memory for at least size geometries. More... | |
int | ringCount (int part=0) const override |
Returns the number of rings of which this geometry is built. More... | |
QgsAbstractGeometry * | segmentize (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... | |
const QgsAbstractGeometry * | simplifiedTypeRef () const override SIP_HOLDGIL |
Returns a reference to the simplest lossless representation of this geometry, e.g. More... | |
QgsGeometryCollection * | snappedToGrid (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... | |
QgsGeometryCollection * | toCurveType () const override |
Returns the geometry converted to the more generic curve type. More... | |
void | transform (const QgsCoordinateTransform &ct, Qgis::TransformDirection d=Qgis::TransformDirection::Forward, 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... | |
bool | transform (QgsAbstractGeometryTransformer *transformer, QgsFeedback *feedback=nullptr) override |
Transforms the vertices from the geometry in place, using the specified geometry transformer object. 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... | |
int | wkbSize (QgsAbstractGeometry::WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const override |
Returns the length of the QByteArray returned by asWkb() More... | |
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QgsAbstractGeometry ()=default | |
Constructor for QgsAbstractGeometry. More... | |
QgsAbstractGeometry (const QgsAbstractGeometry &geom) | |
virtual | ~QgsAbstractGeometry ()=default |
QString | asJson (int precision=17) |
Returns a GeoJSON representation of the geometry as a QString. More... | |
virtual QByteArray | asWkb (WkbFlags flags=QgsAbstractGeometry::WkbFlags()) const =0 |
Returns a WKB representation of the geometry. More... | |
virtual QgsPoint | centroid () const |
Returns the centroid of the geometry. More... | |
virtual int | compareTo (const QgsAbstractGeometry *other) const |
Comparator for sorting of geometry. More... | |
const_part_iterator | const_parts_begin () const |
Returns STL-style iterator pointing to the const first part of the geometry. More... | |
const_part_iterator | const_parts_end () const |
Returns STL-style iterator pointing to the imaginary const part after the last part of the geometry. More... | |
virtual bool | convertTo (QgsWkbTypes::Type type) |
Converts the geometry to a specified type. More... | |
bool | is3D () const SIP_HOLDGIL |
Returns true if the geometry is 3D and contains a z-value. More... | |
bool | isMeasure () const SIP_HOLDGIL |
Returns true if the geometry contains m values. More... | |
QgsAbstractGeometry & | operator= (const QgsAbstractGeometry &geom) |
QgsGeometryPartIterator | parts () |
Returns Java-style iterator for traversal of parts of the geometry. More... | |
QgsGeometryConstPartIterator | parts () const |
Returns Java-style iterator for traversal of parts of the geometry. More... | |
part_iterator | parts_begin () |
Returns STL-style iterator pointing to the first part of the geometry. More... | |
part_iterator | parts_end () |
Returns STL-style iterator pointing to the imaginary part after the last part of the geometry. More... | |
QgsVertexIterator | vertices () const |
Returns a read-only, Java-style iterator for traversal of vertices of all the geometry, including all geometry parts and rings. 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 SIP_HOLDGIL |
Returns the WKB type of the geometry. More... | |
QString | wktTypeStr () const |
Returns the WKT type string of the geometry. More... | |
Static Public Member Functions | |
static const QgsGeometryCollection * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsGeometryCollection. More... | |
Protected Member Functions | |
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... | |
QgsAbstractGeometry * | childGeometry (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... | |
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. 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... | |
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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... | |
int | sortIndex () const |
Returns the sort index for the geometry, used in the compareTo() method to compare geometries of different types. More... | |
Protected Attributes | |
QVector< QgsAbstractGeometry * > | mGeometries |
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QgsWkbTypes::Type | mWkbType = QgsWkbTypes::Unknown |
Additional Inherited Members | |
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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 } |
WKB export flags. More... | |
QgsGeometryCollection::QgsGeometryCollection | ( | ) |
Constructor for an empty geometry collection.
Definition at line 35 of file qgsgeometrycollection.cpp.
QgsGeometryCollection::QgsGeometryCollection | ( | const QgsGeometryCollection & | c | ) |
Definition at line 40 of file qgsgeometrycollection.cpp.
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override |
Definition at line 70 of file qgsgeometrycollection.cpp.
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virtual |
Adds a geometry and takes ownership. Returns true
in case of success.
Reimplemented in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 256 of file qgsgeometrycollection.cpp.
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overridevirtual |
Adds a measure to the geometry, initialized to a preset value.
mValue | initial m-value for all nodes |
true
on success Implements QgsAbstractGeometry.
Definition at line 938 of file qgsgeometrycollection.cpp.
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overridevirtual |
Adds a z-dimension to the geometry, initialized to a preset value.
zValue | initial z-value for all nodes |
true
on success Implements QgsAbstractGeometry.
Definition at line 923 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the vertices adjacent to a specified vertex within a geometry.
Implements QgsAbstractGeometry.
Definition at line 165 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the planar, 2-dimensional area of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 722 of file qgsgeometrycollection.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 |
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 482 of file qgsgeometrycollection.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 |
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 494 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a json object representation of the geometry.
Reimplemented from QgsAbstractGeometry.
Reimplemented in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 506 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a KML representation of the geometry.
Implements QgsAbstractGeometry.
Definition at line 520 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the geometry represented as a QPainterPath.
Implements QgsAbstractGeometry.
Definition at line 353 of file qgsgeometrycollection.cpp.
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override |
Definition at line 428 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a WKT representation of the geometry.
precision | number of decimal places for coordinates |
Implements QgsAbstractGeometry.
Definition at line 455 of file qgsgeometrycollection.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. Implements QgsAbstractGeometry.
Reimplemented in QgsMultiPolygon, QgsMultiCurve, QgsMultiSurface, and QgsMultiPoint.
Definition at line 160 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the minimal bounding box for the geometry.
Implements QgsAbstractGeometry.
Definition at line 533 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns true
if the bounding box of this geometry intersects with a rectangle.
Since this test only considers the bounding box of the geometry, is is very fast to calculate and handles invalid geometries.
Reimplemented from QgsAbstractGeometry.
Definition at line 203 of file qgsgeometrycollection.cpp.
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overrideprotectedvirtual |
Default calculator for the minimal bounding box for the geometry.
Derived classes should override this method if a more efficient bounding box calculation is available.
Reimplemented from QgsAbstractGeometry.
Definition at line 542 of file qgsgeometrycollection.cpp.
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inlinestatic |
Cast the geom to a QgsGeometryCollection.
Should be used by qgsgeometry_cast<QgsGeometryCollection *>( geometry ).
Definition at line 256 of file qgsgeometrycollection.h.
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overrideprotectedvirtual |
Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e.
curve / point)
Reimplemented from QgsAbstractGeometry.
Definition at line 1057 of file qgsgeometrycollection.cpp.
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overrideprotectedvirtual |
Returns pointer to child geometry (for geometries with child geometries - i.e.
geom. collection / polygon)
Reimplemented from QgsAbstractGeometry.
Definition at line 1062 of file qgsgeometrycollection.cpp.
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overridevirtual |
Clears the geometry, ie reset it to a null geometry.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiLineString, QgsMultiPoint, QgsMultiPolygon, QgsMultiSurface, and QgsMultiCurve.
Definition at line 124 of file qgsgeometrycollection.cpp.
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overrideprotectedvirtual |
Clears any cached parameters associated with the geometry, e.g., bounding boxes.
Reimplemented from QgsAbstractGeometry.
Definition at line 578 of file qgsgeometrycollection.cpp.
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overridevirtual |
Clones the geometry by performing a deep copy.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiPolygon, QgsMultiSurface, QgsMultiLineString, QgsMultiPoint, and QgsMultiCurve.
Definition at line 119 of file qgsgeometrycollection.cpp.
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overridevirtual |
Searches for the closest segment of the geometry to a given point.
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 |
Implements QgsAbstractGeometry.
Definition at line 617 of file qgsgeometrycollection.cpp.
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finalprotectedvirtual |
Compares to an other geometry of the same class, and returns a integer for sorting of the two geometries.
Implements QgsAbstractGeometry.
Definition at line 1069 of file qgsgeometrycollection.cpp.
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overridevirtual |
Retrieves the sequence of geometries, rings and nodes.
Implements QgsAbstractGeometry.
Definition at line 586 of file qgsgeometrycollection.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.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiCurve, QgsMultiSurface, QgsMultiPolygon, QgsMultiLineString, and QgsMultiPoint.
Definition at line 112 of file qgsgeometrycollection.cpp.
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overridevirtual |
Deletes a vertex within the geometry.
position | vertex id for vertex to delete |
true
if delete was successful Implements QgsAbstractGeometry.
Definition at line 683 of file qgsgeometrycollection.cpp.
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overridevirtual |
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 306 of file qgsgeometrycollection.cpp.
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overridevirtual |
Draws the geometry using the specified QPainter.
p | destination QPainter |
Implements QgsAbstractGeometry.
Definition at line 344 of file qgsgeometrycollection.cpp.
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overridevirtual |
Drops any measure values which exist in the geometry.
true
if m-values were present and have been removed Implements QgsAbstractGeometry.
Definition at line 968 of file qgsgeometrycollection.cpp.
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overridevirtual |
Drops any z-dimensions which exist in the geometry.
true
if Z values were present and have been removed Implements QgsAbstractGeometry.
Definition at line 954 of file qgsgeometrycollection.cpp.
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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.
Reimplemented from QgsAbstractGeometry.
Reimplemented in QgsMultiPoint.
Definition at line 982 of file qgsgeometrycollection.cpp.
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protected |
Reads a collection from a WKT string.
Definition at line 744 of file qgsgeometrycollection.cpp.
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overridevirtual |
Sets the geometry from a WKB string.
After successful read the wkb argument will be at the position where the reading has stopped.
Implements QgsAbstractGeometry.
Definition at line 365 of file qgsgeometrycollection.cpp.
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overridevirtual |
Sets the geometry from a WKT string.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 404 of file qgsgeometrycollection.cpp.
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inline |
Returns a const reference to a geometry from within the collection.
n | index of geometry to return |
Definition at line 86 of file qgsgeometrycollection.h.
QgsAbstractGeometry * QgsGeometryCollection::geometryN | ( | int | n | ) |
Returns a geometry from within the collection.
n | index of geometry to return |
Definition at line 237 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a unique string representing the geometry type.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiLineString, QgsMultiPolygon, QgsMultiSurface, QgsMultiCurve, and QgsMultiPoint.
Definition at line 321 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns true
if the geometry contains curved segments.
Reimplemented from QgsAbstractGeometry.
Definition at line 811 of file qgsgeometrycollection.cpp.
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virtual |
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 in QgsMultiSurface, QgsMultiLineString, QgsMultiPolygon, QgsMultiPoint, and QgsMultiCurve.
Definition at line 268 of file qgsgeometrycollection.cpp.
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overridevirtual |
Inserts a vertex into the geometry.
position | vertex id for position of inserted vertex |
vertex | vertex to insert |
true
if insert was successful Implements QgsAbstractGeometry.
Definition at line 653 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns true
if the geometry is empty.
Reimplemented from QgsAbstractGeometry.
Definition at line 243 of file qgsgeometrycollection.cpp.
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overridevirtual |
Checks validity of the geometry, and returns true
if the geometry is valid.
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). |
true
if geometry is validImplements QgsAbstractGeometry.
Reimplemented in QgsMultiPoint.
Definition at line 904 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the planar, 2-dimensional length of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 711 of file qgsgeometrycollection.cpp.
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overridevirtual |
Moves a vertex within the geometry.
position | vertex id for vertex to move |
newPos | new position of vertex |
true
if move was successful Implements QgsAbstractGeometry.
Definition at line 668 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the number of nodes contained in the geometry.
Reimplemented from QgsAbstractGeometry.
Reimplemented in QgsMultiPoint.
Definition at line 604 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns next vertex id and coordinates.
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 |
false
if at end Implements QgsAbstractGeometry.
Definition at line 622 of file qgsgeometrycollection.cpp.
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finalvirtual |
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.
Implements QgsAbstractGeometry.
Definition at line 294 of file qgsgeometrycollection.cpp.
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inline |
Returns the number of geometries within the collection.
Definition at line 58 of file qgsgeometrycollection.h.
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overridevirtual |
Implements QgsAbstractGeometry.
Definition at line 107 of file qgsgeometrycollection.cpp.
QgsGeometryCollection & QgsGeometryCollection::operator= | ( | const QgsGeometryCollection & | c | ) |
Definition at line 54 of file qgsgeometrycollection.cpp.
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overridevirtual |
Implements QgsAbstractGeometry.
Definition at line 75 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns count of parts contained in the geometry.
Implements QgsAbstractGeometry.
Definition at line 894 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the planar, 2-dimensional perimeter of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 733 of file qgsgeometrycollection.cpp.
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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 150 of file qgsgeometrycollection.cpp.
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virtual |
Removes a geometry from the collection.
nr | index of geometry to remove |
true
if removal was successful. Definition at line 282 of file qgsgeometrycollection.cpp.
void QgsGeometryCollection::reserve | ( | int | size | ) |
Attempts to allocate memory for at least size geometries.
If the number of geometries is known in advance, calling this function prior to adding geometries will prevent reallocations and memory fragmentation.
Definition at line 232 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the number of rings of which this geometry is built.
Implements QgsAbstractGeometry.
Definition at line 884 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a geometry without curves.
Caller takes ownership
tolerance | segmentation tolerance |
toleranceType | maximum segmentation angle or maximum difference between approximation and curve |
Reimplemented from QgsAbstractGeometry.
Definition at line 824 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the length of the segment of the geometry which begins at startVertex.
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiPoint.
Definition at line 858 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns a reference to the simplest lossless representation of this geometry, e.g.
if the geometry is a multipart geometry type with a single member geometry, a reference to that part will be returned.
This method employs the following logic:
This method returns a reference only, and does not involve any geometry cloning.
Reimplemented from QgsAbstractGeometry.
Definition at line 1023 of file qgsgeometrycollection.cpp.
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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:
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).
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. |
Implements QgsAbstractGeometry.
Definition at line 131 of file qgsgeometrycollection.cpp.
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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.
Implements QgsAbstractGeometry.
Definition at line 1002 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the geometry converted to the more generic curve type.
E.g. QgsLineString -> QgsCompoundCurve, QgsPolygon -> QgsCurvePolygon, QgsMultiLineString -> QgsMultiCurve, QgsMultiPolygon -> QgsMultiSurface
Implements QgsAbstractGeometry.
Reimplemented in QgsMultiLineString, QgsMultiPolygon, QgsMultiSurface, QgsMultiPoint, and QgsMultiCurve.
Definition at line 1012 of file qgsgeometrycollection.cpp.
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overridevirtual |
Transforms the geometry using a coordinate transform.
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 326 of file qgsgeometrycollection.cpp.
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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 335 of file qgsgeometrycollection.cpp.
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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.
true
if the geometry was successfully transformed.Implements QgsAbstractGeometry.
Definition at line 1031 of file qgsgeometrycollection.cpp.
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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.
Reimplemented from QgsAbstractGeometry.
Definition at line 992 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns approximate angle at a vertex.
This is usually the average angle between adjacent segments, and can be pictured as the orientation of a line following the curvature of the geometry at the specified vertex.
vertex | the vertex id |
Implements QgsAbstractGeometry.
Definition at line 842 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the point corresponding to a specified vertex id.
Implements QgsAbstractGeometry.
Definition at line 899 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the number of vertices of which this geometry is built.
Implements QgsAbstractGeometry.
Definition at line 874 of file qgsgeometrycollection.cpp.
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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.
Reimplemented in QgsMultiPoint.
Definition at line 177 of file qgsgeometrycollection.cpp.
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overridevirtual |
Returns the length of the QByteArray returned by asWkb()
The optional flags argument specifies flags controlling WKB export behavior
Implements QgsAbstractGeometry.
Definition at line 414 of file qgsgeometrycollection.cpp.
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protectedvirtual |
Returns whether child type names are omitted from Wkt representations of the collection.
Reimplemented in QgsMultiPolygon, QgsMultiLineString, and QgsMultiPoint.
Definition at line 1052 of file qgsgeometrycollection.cpp.
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protected |
Definition at line 338 of file qgsgeometrycollection.h.