QgsAbstractGeometry class

Abstract base class for all geometries.

Contents

Derived classes

class QgsCurve
Abstract base class for curved geometry type.
class QgsGeometryCollection
Geometry collection.
class QgsPoint
Point geometry type, with support for z-dimension and m-values.

Public types

class const_part_iterator
The part_iterator class provides STL-style iterator for const references to geometry parts.
class part_iterator
The part_iterator class provides STL-style iterator for geometry parts.
class vertex_iterator
The vertex_iterator class provides STL-style iterator for vertices.
enum AxisOrder { XY = 0, YX }
Axis order for GML generation.
enum SegmentationToleranceType { MaximumAngle = 0, MaximumDifference }
Segmentation tolerance as maximum angle or maximum difference between approximation and circle.

Constructors, destructors, conversion operators

QgsAbstractGeometry() defaulted
Constructor for QgsAbstractGeometry.

Public functions

auto addMValue(double mValue = 0) -> bool pure virtual
Adds a measure to the geometry, initialized to a preset value.
auto addZValue(double zValue = 0) -> bool pure virtual
Adds a z-dimension to the geometry, initialized to a preset value.
void adjacentVertices(QgsVertexId vertex, QgsVertexId& previousVertex, QgsVertexId& nextVertex) const pure virtual
Returns the vertices adjacent to a specified vertex within a geometry.
auto area() const -> double virtual
Returns the area of the geometry.
auto asGml2(QDomDocument& doc, int precision = 17, const QString& ns = "gml", AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY) const -> QDomElement pure virtual
Returns a GML2 representation of the geometry.
auto asGml3(QDomDocument& doc, int precision = 17, const QString& ns = "gml", AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY) const -> QDomElement pure virtual
Returns a GML3 representation of the geometry.
auto asJson(int precision = 17) const -> QString pure virtual
Returns a GeoJSON representation of the geometry.
auto asWkb() const -> QByteArray pure virtual
Returns a WKB representation of the geometry.
auto asWkt(int precision = 17) const -> QString pure virtual
Returns a WKT representation of the geometry.
auto boundary() const -> QgsAbstractGeometry* pure virtual
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry).
auto boundingBox() const -> QgsRectangle pure virtual
Returns the minimal bounding box for the geometry.
auto centroid() const -> QgsPoint virtual
Returns the centroid of the geometry.
void clear() pure virtual
Clears the geometry, ie reset it to a null geometry.
auto clone() const -> QgsAbstractGeometry* pure virtual
Clones the geometry by performing a deep copy.
auto closestSegment(const QgsPoint& pt, QgsPoint& segmentPt, QgsVertexId& vertexAfter, int* leftOf = nullptr, double epsilon = 4*std::numeric_limits<double>::epsilon()) const -> double pure virtual
Searches for the closest segment of the geometry to a given point.
auto const_parts_begin() const -> const_part_iterator
Returns STL-style iterator pointing to the const first part of the geometry.
auto const_parts_end() const -> const_part_iterator
Returns STL-style iterator pointing to the imaginary const part after the last part of the geometry.
auto convertTo(QgsWkbTypes::Type type) -> bool virtual
Converts the geometry to a specified type.
auto coordinateSequence() const -> QgsCoordinateSequence pure virtual
Retrieves the sequence of geometries, rings and nodes.
auto createEmptyWithSameType() const -> QgsAbstractGeometry* pure virtual
Creates a new geometry with the same class and same WKB type as the original and transfers ownership.
auto deleteVertex(QgsVertexId position) -> bool pure virtual
Deletes a vertex within the geometry.
auto dimension() const -> int pure virtual
Returns the inherent dimension of the geometry.
void draw(QPainter& p) const pure virtual
Draws the geometry using the specified QPainter.
auto dropMValue() -> bool pure virtual
Drops any measure values which exist in the geometry.
auto dropZValue() -> bool pure virtual
Drops any z-dimensions which exist in the geometry.
void filterVertices(const std::function<bool(const QgsPoint&)>& filter) virtual
Filters the vertices from the geometry in place, removing any which do not return true for the filter function check.
auto fromWkb(QgsConstWkbPtr& wkb) -> bool pure virtual
Sets the geometry from a WKB string.
auto fromWkt(const QString& wkt) -> bool pure virtual
Sets the geometry from a WKT string.
auto geometryType() const -> QString pure virtual
Returns a unique string representing the geometry type.
auto hasCurvedSegments() const -> bool virtual
Returns true if the geometry contains curved segments.
auto insertVertex(QgsVertexId position, const QgsPoint& vertex) -> bool pure virtual
Inserts a vertex into the geometry.
auto is3D() const -> bool
Returns true if the geometry is 3D and contains a z-value.
auto isEmpty() const -> bool virtual
Returns true if the geometry is empty.
auto isMeasure() const -> bool
Returns true if the geometry contains m values.
auto length() const -> double virtual
Returns the length of the geometry.
auto moveVertex(QgsVertexId position, const QgsPoint& newPos) -> bool pure virtual
Moves a vertex within the geometry.
auto nCoordinates() const -> int virtual
Returns the number of nodes contained in the geometry.
auto nextVertex(QgsVertexId& id, QgsPoint& vertex) const -> bool pure virtual
Returns next vertex id and coordinates.
auto partCount() const -> int pure virtual
Returns count of parts contained in the geometry.
auto parts() const -> QgsGeometryConstPartIterator
Returns Java-style iterator for traversal of parts of the geometry.
auto parts() -> QgsGeometryPartIterator
Returns Java-style iterator for traversal of parts of the geometry.
auto parts_begin() -> part_iterator
Returns STL-style iterator pointing to the first part of the geometry.
auto parts_end() -> part_iterator
Returns STL-style iterator pointing to the imaginary part after the last part of the geometry.
auto perimeter() const -> double virtual
Returns the perimeter of the geometry.
auto removeDuplicateNodes(double epsilon = 4*std::numeric_limits<double>::epsilon(), bool useZValues = false) -> bool pure virtual
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a degenerate geometry.
auto ringCount(int part = 0) const -> int pure virtual
Returns the number of rings of which this geometry is built.
auto segmentize(double tolerance = M_PI/180., SegmentationToleranceType toleranceType = MaximumAngle) const -> QgsAbstractGeometry* virtual
Returns a version of the geometry without curves.
auto segmentLength(QgsVertexId startVertex) const -> double pure virtual
Returns the length of the segment of the geometry which begins at startVertex.
auto snappedToGrid(double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0) const -> QgsAbstractGeometry* pure virtual
Makes a new geometry with all the points or vertices snapped to the closest point of the grid.
void swapXy() pure virtual
Swaps the x and y coordinates from the geometry.
auto toCurveType() const -> QgsAbstractGeometry* pure virtual
Returns the geometry converted to the more generic curve type.
void transform(const QgsCoordinateTransform& ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform, bool transformZ = false) pure virtual
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) pure virtual
Transforms the x and y components of the geometry using a QTransform object t.
void transformVertices(const std::function<QgsPoint(const QgsPoint&)>& transform) virtual
Transforms the vertices from the geometry in place, applying the transform function to every vertex.
auto vertexAngle(QgsVertexId vertex) const -> double pure virtual
Returns approximate angle at a vertex.
auto vertexAt(QgsVertexId id) const -> QgsPoint pure virtual
Returns the point corresponding to a specified vertex id.
auto vertexCount(int part = 0, int ring = 0) const -> int pure virtual
Returns the number of vertices of which this geometry is built.
auto vertexNumberFromVertexId(QgsVertexId id) const -> int pure virtual
Returns the vertex number corresponding to a vertex id.
auto vertices() const -> QgsVertexIterator
Returns a read-only, Java-style iterator for traversal of vertices of all the geometry, including all geometry parts and rings.
auto vertices_begin() const -> vertex_iterator
Returns STL-style iterator pointing to the first vertex of the geometry.
auto vertices_end() const -> vertex_iterator
Returns STL-style iterator pointing to the imaginary vertex after the last vertex of the geometry.
auto wkbType() const -> QgsWkbTypes::Type
Returns the WKB type of the geometry.
auto wktTypeStr() const -> QString
Returns the WKT type string of the geometry.

Protected functions

auto calculateBoundingBox() const -> QgsRectangle virtual
Default calculator for the minimal bounding box for the geometry.
auto childCount() const -> int virtual
Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e.
auto childGeometry(int index) const -> QgsAbstractGeometry* virtual
Returns pointer to child geometry (for geometries with child geometries - i.e.
auto childPoint(int index) const -> QgsPoint virtual
Returns point at index (for geometries without child geometries - i.e.
void clearCache() const virtual
Clears any cached parameters associated with the geometry, e.g., bounding boxes.
auto hasChildGeometries() const -> bool virtual
Returns whether the geometry has any child geometries (false for point / curve, true otherwise)
void setZMTypeFromSubGeometry(const QgsAbstractGeometry* subggeom, QgsWkbTypes::Type baseGeomType)
Updates the geometry type based on whether sub geometries contain z or m values.

Enum documentation

enum QgsAbstractGeometry::AxisOrder

Axis order for GML generation.

Enumerators
XY

X comes before Y (or lon before lat)
YX

Y comes before X (or lat before lon)

enum QgsAbstractGeometry::SegmentationToleranceType

Segmentation tolerance as maximum angle or maximum difference between approximation and circle.

Enumerators
MaximumAngle

Maximum angle between generating radii (lines from arc center to output vertices)
MaximumDifference

Maximum distance between an arbitrary point on the original curve and closest point on its approximation.

Function documentation

bool QgsAbstractGeometry::addMValue(double mValue = 0) pure virtual

Adds a measure to the geometry, initialized to a preset value.

Parameters
mValue initial m-value for all nodes
Returns true on success

bool QgsAbstractGeometry::addZValue(double zValue = 0) pure virtual

Adds a z-dimension to the geometry, initialized to a preset value.

Parameters
zValue initial z-value for all nodes
Returns true on success

void QgsAbstractGeometry::adjacentVertices(QgsVertexId vertex, QgsVertexId& previousVertex, QgsVertexId& nextVertex) const pure virtual

Returns the vertices adjacent to a specified vertex within a geometry.

double QgsAbstractGeometry::area() const virtual

Returns the area of the geometry.

QDomElement QgsAbstractGeometry::asGml2(QDomDocument& doc, int precision = 17, const QString& ns = "gml", AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY) const pure virtual

Returns a GML2 representation of the geometry.

Parameters
doc DOM document
precision number of decimal places for coordinates
ns XML namespace
axisOrder Axis order for generated GML

QDomElement QgsAbstractGeometry::asGml3(QDomDocument& doc, int precision = 17, const QString& ns = "gml", AxisOrder axisOrder = QgsAbstractGeometry::AxisOrder::XY) const pure virtual

Returns a GML3 representation of the geometry.

Parameters
doc DOM document
precision number of decimal places for coordinates
ns XML namespace
axisOrder Axis order for generated GML

QString QgsAbstractGeometry::asJson(int precision = 17) const pure virtual

Returns a GeoJSON representation of the geometry.

Parameters
precision number of decimal places for coordinates

QByteArray QgsAbstractGeometry::asWkb() const pure virtual

Returns a WKB representation of the geometry.

QString QgsAbstractGeometry::asWkt(int precision = 17) const pure virtual

Returns a WKT representation of the geometry.

Parameters
precision number of decimal places for coordinates

QgsAbstractGeometry* QgsAbstractGeometry::boundary() const pure virtual

Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry).

Returns boundary for geometry. May be null for some geometry types.

For instance, a polygon geometry will have a boundary consisting of the linestrings for each ring in the polygon.

double QgsAbstractGeometry::closestSegment(const QgsPoint& pt, QgsPoint& segmentPt, QgsVertexId& vertexAfter, int* leftOf = nullptr, double epsilon = 4*std::numeric_limits<double>::epsilon()) const pure virtual

Searches for the closest segment of the geometry to a given point.

Parameters
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
Returns squared distance to closest segment or negative value on error

const_part_iterator QgsAbstractGeometry::const_parts_begin() const

Returns STL-style iterator pointing to the const first part of the geometry.

const_part_iterator QgsAbstractGeometry::const_parts_end() const

Returns STL-style iterator pointing to the imaginary const part after the last part of the geometry.

bool QgsAbstractGeometry::convertTo(QgsWkbTypes::Type type) virtual

Converts the geometry to a specified type.

Returns true if conversion was successful

QgsCoordinateSequence QgsAbstractGeometry::coordinateSequence() const pure virtual

Retrieves the sequence of geometries, rings and nodes.

Returns coordinate sequence

QgsAbstractGeometry* QgsAbstractGeometry::createEmptyWithSameType() const pure virtual

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.

bool QgsAbstractGeometry::deleteVertex(QgsVertexId position) pure virtual

Deletes a vertex within the geometry.

Parameters
position vertex id for vertex to delete
Returns true if delete was successful

int QgsAbstractGeometry::dimension() const pure virtual

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.

void QgsAbstractGeometry::draw(QPainter& p) const pure virtual

Draws the geometry using the specified QPainter.

Parameters
p destination QPainter

bool QgsAbstractGeometry::dropMValue() pure virtual

Drops any measure values which exist in the geometry.

Returns true if m-values were present and have been removed

bool QgsAbstractGeometry::dropZValue() pure virtual

Drops any z-dimensions which exist in the geometry.

Returns true if Z values were present and have been removed

void QgsAbstractGeometry::filterVertices(const std::function<bool(const QgsPoint&)>& filter) virtual

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.

bool QgsAbstractGeometry::fromWkb(QgsConstWkbPtr& wkb) pure virtual

Sets the geometry from a WKB string.

After successful read the wkb argument will be at the position where the reading has stopped.

bool QgsAbstractGeometry::fromWkt(const QString& wkt) pure virtual

Sets the geometry from a WKT string.

QString QgsAbstractGeometry::geometryType() const pure virtual

Returns a unique string representing the geometry type.

bool QgsAbstractGeometry::insertVertex(QgsVertexId position, const QgsPoint& vertex) pure virtual

Inserts a vertex into the geometry.

Parameters
position vertex id for position of inserted vertex
vertex vertex to insert
Returns true if insert was successful

bool QgsAbstractGeometry::is3D() const

Returns true if the geometry is 3D and contains a z-value.

bool QgsAbstractGeometry::isMeasure() const

Returns true if the geometry contains m values.

double QgsAbstractGeometry::length() const virtual

Returns the length of the geometry.

bool QgsAbstractGeometry::moveVertex(QgsVertexId position, const QgsPoint& newPos) pure virtual

Moves a vertex within the geometry.

Parameters
position vertex id for vertex to move
newPos new position of vertex
Returns true if move was successful

bool QgsAbstractGeometry::nextVertex(QgsVertexId& id, QgsPoint& vertex) const pure virtual

Returns next vertex id and coordinates.

Parameters
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
Returns false if at end

int QgsAbstractGeometry::partCount() const pure virtual

Returns count of parts contained in the geometry.

QgsGeometryConstPartIterator QgsAbstractGeometry::parts() const

Returns Java-style iterator for traversal of parts of the geometry.

This iterator returns read-only references to parts and cannot be used to modify the parts.

QgsGeometryPartIterator QgsAbstractGeometry::parts()

Returns Java-style iterator for traversal of parts of the geometry.

This iterator can safely be used to modify parts of the geometry.

  • Example:

    # print the WKT representation of each part in a multi-point geometry
geometry = QgsMultiPoint.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' )
for part in geometry.parts():
    print(part.asWkt())

# single part geometries only have one part - this loop will iterate once only
geometry = QgsLineString.fromWkt( 'LineString( 0 0, 10 10 )' )
for part in geometry.parts():
    print(part.asWkt())

# parts can be modified during the iteration
geometry = QgsMultiPoint.fromWkt( 'MultiPoint( 0 0, 1 1, 2 2)' )
for part in geometry.parts():
    part.transform(ct)

# part iteration can also be combined with vertex iteration
geometry = QgsMultiPolygon.fromWkt( 'MultiPolygon((( 0 0, 0 10, 10 10, 10 0, 0 0 ),( 5 5, 5 6, 6 6, 6 5, 5 5)),((20 2, 22 2, 22 4, 20 4, 20 2)))' )
for part in geometry.parts():
    for v in part.vertices():
        print(v.x(), v.y())

part_iterator QgsAbstractGeometry::parts_begin()

Returns STL-style iterator pointing to the first part of the geometry.

part_iterator QgsAbstractGeometry::parts_end()

Returns STL-style iterator pointing to the imaginary part after the last part of the geometry.

double QgsAbstractGeometry::perimeter() const virtual

Returns the perimeter of the geometry.

bool QgsAbstractGeometry::removeDuplicateNodes(double epsilon = 4*std::numeric_limits<double>::epsilon(), bool useZValues = false) pure virtual

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.

QgsAbstractGeometry* QgsAbstractGeometry::segmentize(double tolerance = M_PI/180., SegmentationToleranceType toleranceType = MaximumAngle) const virtual

Returns a version of the geometry without curves.

Parameters
tolerance segmentation tolerance
toleranceType maximum segmentation angle or maximum difference between approximation and curve

Caller takes ownership of the returned geometry.

double QgsAbstractGeometry::segmentLength(QgsVertexId startVertex) const pure virtual

Returns the length of the segment of the geometry which begins at startVertex.

QgsAbstractGeometry* QgsAbstractGeometry::snappedToGrid(double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0) const pure virtual

Makes a new geometry with all the points or vertices snapped to the closest point of the grid.

Parameters
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.

Ownership is transferred to the caller.

If the gridified geometry could not be calculated a 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: geometry->snappedToGrid(1, 1); 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).

void QgsAbstractGeometry::swapXy() pure virtual

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.

QgsAbstractGeometry* QgsAbstractGeometry::toCurveType() const pure virtual

Returns the geometry converted to the more generic curve type.

Returns the converted geometry. Caller takes ownership

E.g. QgsLineString -> QgsCompoundCurve, QgsPolygon -> QgsCurvePolygon, QgsMultiLineString -> QgsMultiCurve, QgsMultiPolygon -> QgsMultiSurface

void QgsAbstractGeometry::transform(const QgsCoordinateTransform& ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform, bool transformZ = false) pure virtual

Transforms the geometry using a coordinate transform.

Parameters
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.

void QgsAbstractGeometry::transform(const QTransform& t, double zTranslate = 0.0, double zScale = 1.0, double mTranslate = 0.0, double mScale = 1.0) pure virtual

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.

void QgsAbstractGeometry::transformVertices(const std::function<QgsPoint(const QgsPoint&)>& transform) virtual

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.

double QgsAbstractGeometry::vertexAngle(QgsVertexId vertex) const pure virtual

Returns approximate angle at a vertex.

Parameters
vertex the vertex id
Returns rotation in radians, clockwise from north

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.

int QgsAbstractGeometry::vertexNumberFromVertexId(QgsVertexId id) const pure virtual

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.

QgsVertexIterator QgsAbstractGeometry::vertices() const

Returns a read-only, Java-style iterator for traversal of vertices of all the geometry, including all geometry parts and rings.

  • Example:

    # print the x and y coordinate for each vertex in a LineString
geometry = QgsLineString.fromWkt( 'LineString( 0 0, 1 1, 2 2)' )
for v in geometry.vertices():
    print(v.x(), v.y())

# vertex iteration includes all parts and rings
geometry = QgsMultiPolygon.fromWkt( 'MultiPolygon((( 0 0, 0 10, 10 10, 10 0, 0 0 ),( 5 5, 5 6, 6 6, 6 5, 5 5)),((20 2, 22 2, 22 4, 20 4, 20 2)))' )
for v in geometry.vertices():
    print(v.x(), v.y())

vertex_iterator QgsAbstractGeometry::vertices_begin() const

Returns STL-style iterator pointing to the first vertex of the geometry.

vertex_iterator QgsAbstractGeometry::vertices_end() const

Returns STL-style iterator pointing to the imaginary vertex after the last vertex of the geometry.

QgsWkbTypes::Type QgsAbstractGeometry::wkbType() const

Returns the WKB type of the geometry.

QString QgsAbstractGeometry::wktTypeStr() const

Returns the WKT type string of the geometry.

QgsRectangle QgsAbstractGeometry::calculateBoundingBox() const virtual protected

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.

int QgsAbstractGeometry::childCount() const virtual protected

Returns number of child geometries (for geometries with child geometries) or child points (for geometries without child geometries - i.e.

curve / point)

QgsAbstractGeometry* QgsAbstractGeometry::childGeometry(int index) const virtual protected

Returns pointer to child geometry (for geometries with child geometries - i.e.

geom. collection / polygon)

QgsPoint QgsAbstractGeometry::childPoint(int index) const virtual protected

Returns point at index (for geometries without child geometries - i.e.

curve / point)

bool QgsAbstractGeometry::hasChildGeometries() const virtual protected

Returns whether the geometry has any child geometries (false for point / curve, true otherwise)