QGIS API Documentation 3.40.0-Bratislava (b56115d8743)
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Curve polygon geometry type. More...
#include <qgscurvepolygon.h>
Public Member Functions | |
QgsCurvePolygon () | |
QgsCurvePolygon (const QgsCurvePolygon &p) | |
~QgsCurvePolygon () override | |
virtual void | addInteriorRing (QgsCurve *ring) |
Adds an interior ring to the geometry (takes ownership) | |
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. | |
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. | |
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. | |
QgsAbstractGeometry * | boundary () const override |
Returns the closure of the combinatorial boundary of the geometry (ie the topological boundary of the geometry). | |
bool | boundingBoxIntersects (const QgsBox3D &box3d) const override |
Returns true if the bounding box of this geometry intersects with a box3d. | |
void | clear () override |
Clears the geometry, ie reset it to a null geometry. | |
QgsCurvePolygon * | clone () const override |
Clones the geometry by performing a deep copy. | |
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. | |
QgsCurvePolygon * | createEmptyWithSameType () const override |
Creates a new geometry with the same class and same WKB type as the original and transfers ownership. | |
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. | |
QgsCurve * | exteriorRing () |
Returns a non-const pointer to the curve polygon's exterior ring. | |
const QgsCurve * | exteriorRing () const |
Returns the curve polygon's exterior ring. | |
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. | |
void | forceClockwise () |
Forces the polygon to respect the exterior ring is clockwise, interior rings are counter-clockwise convention. | |
void | forceCounterClockwise () |
Forces the polygon to respect the exterior ring is counter-clockwise, interior rings are clockwise convention. | |
void | forceRHR () |
Forces the geometry to respect the Right-Hand-Rule, in which the area that is bounded by the polygon is to the right of the boundary. | |
bool | fromWkb (QgsConstWkbPtr &wkb) override |
Sets the geometry from a WKB string. | |
bool | fromWkt (const QString &wkt) override |
Sets the geometry from a WKT 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. | |
QString | geometryType () const override |
Returns a unique string representing the geometry type. | |
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. | |
QgsCurve * | interiorRing (int i) |
Retrieves an interior ring from the curve polygon. | |
const QgsCurve * | interiorRing (int i) const |
Retrieves an interior ring from the curve polygon. | |
bool | isEmpty () const override |
Returns true if the geometry is empty. | |
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 | numInteriorRings () const |
Returns the number of interior rings contained with the curve polygon. | |
bool | operator!= (const QgsAbstractGeometry &other) const override |
QgsCurvePolygon & | operator= (const QgsCurvePolygon &p) |
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. | |
bool | removeInteriorRing (int ringIndex) |
Removes an interior ring from the polygon. | |
void | removeInteriorRings (double minimumAllowedArea=-1) |
Removes the interior rings from the polygon. | |
void | removeInvalidRings () |
Removes any interior rings which are not valid from the polygon. | |
int | ringCount (int part=0) const override |
Returns the number of rings of which this geometry is built. | |
double | roundness () const |
Returns the roundness of the curve polygon. | |
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. | |
virtual void | setExteriorRing (QgsCurve *ring) |
Sets the exterior ring of the polygon. | |
void | setInteriorRings (const QVector< QgsCurve * > &rings) |
Sets all interior rings (takes ownership) | |
QgsCurvePolygon * | simplifyByDistance (double tolerance) const override |
Simplifies the geometry by applying the Douglas Peucker simplification by distance algorithm. | |
QgsCurvePolygon * | 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. | |
virtual QgsPolygon * | surfaceToPolygon () const |
Gets a polygon representation of this surface. | |
void | swapXy () override |
Swaps the x and y coordinates from the geometry. | |
QgsCurvePolygon * | toCurveType () const override |
Returns the geometry converted to the more generic curve type. | |
virtual QgsPolygon * | toPolygon (double tolerance=M_PI_2/90, SegmentationToleranceType toleranceType=MaximumAngle) const |
Returns a new polygon geometry corresponding to a segmentized approximation of the curve. | |
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 rotation angle for 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 QgsSurface | |
QgsBox3D | boundingBox3D () const override |
Returns the 3D bounding box for the geometry. | |
bool | isValid (QString &error, Qgis::GeometryValidityFlags flags=Qgis::GeometryValidityFlags()) const override |
Checks validity of the geometry, and returns true if the geometry is valid. | |
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. | |
virtual double | length () const |
Returns the planar, 2-dimensional length of the geometry. | |
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. | |
virtual const QgsAbstractGeometry * | simplifiedTypeRef () const |
Returns a reference to the simplest lossless representation of this geometry, e.g. | |
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 QgsCurvePolygon * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsCurvePolygon. | |
Static Public Member Functions inherited from QgsSurface | |
static const QgsSurface * | cast (const QgsAbstractGeometry *geom) |
Cast the geom to a QgsSurface. | |
Protected Member Functions | |
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. | |
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. | |
Protected Member Functions inherited from QgsSurface | |
void | clearCache () const override |
Clears any cached parameters associated with the geometry, e.g., bounding boxes. | |
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. | |
Protected Attributes | |
std::unique_ptr< QgsCurve > | mExteriorRing |
QVector< QgsCurve * > | mInteriorRings |
Protected Attributes inherited from QgsSurface | |
QgsBox3D | mBoundingBox |
bool | mHasCachedValidity = false |
QString | mValidityFailureReason |
Protected Attributes inherited from QgsAbstractGeometry | |
Qgis::WkbType | mWkbType = Qgis::WkbType::Unknown |
Additional Inherited Members | |
Public Types inherited from QgsAbstractGeometry | |
enum | AxisOrder { XY = 0 , YX } |
Axis order for GML generation. More... | |
enum | SegmentationToleranceType { MaximumAngle = 0 , MaximumDifference } |
Segmentation tolerance as maximum angle or maximum difference between approximation and circle. More... | |
enum | WkbFlag { FlagExportTrianglesAsPolygons = 1 << 0 , FlagExportNanAsDoubleMin = 1 << 1 } |
WKB export flags. More... | |
typedef QFlags< WkbFlag > | WkbFlags |
Curve polygon geometry type.
Definition at line 34 of file qgscurvepolygon.h.
QgsCurvePolygon::QgsCurvePolygon | ( | ) |
Definition at line 36 of file qgscurvepolygon.cpp.
QgsCurvePolygon::QgsCurvePolygon | ( | const QgsCurvePolygon & | p | ) |
Definition at line 63 of file qgscurvepolygon.cpp.
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override |
Definition at line 41 of file qgscurvepolygon.cpp.
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virtual |
Adds an interior ring to the geometry (takes ownership)
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 753 of file qgscurvepolygon.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 1307 of file qgscurvepolygon.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 1290 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns the vertices adjacent to a specified vertex within a geometry.
Implements QgsAbstractGeometry.
Definition at line 1113 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns the planar, 2-dimensional area of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 465 of file qgscurvepolygon.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.
Definition at line 328 of file qgscurvepolygon.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 QgsTriangle.
Definition at line 355 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns a json object representation of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 397 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns a KML representation of the geometry.
Implements QgsAbstractGeometry.
Definition at line 423 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns the geometry represented as a QPainterPath.
Implements QgsAbstractGeometry.
Definition at line 879 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns a WKB representation of the geometry.
The optional flags argument specifies flags controlling WKB export behavior (since QGIS 3.14).
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon.
Definition at line 268 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns a WKT representation of the geometry.
precision | number of decimal places for coordinates |
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon.
Definition at line 287 of file qgscurvepolygon.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 QgsPolygon, and QgsTriangle.
Definition at line 534 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns true
if the bounding box of this geometry intersects with a box3d.
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 653 of file qgscurvepolygon.cpp.
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overrideprotectedvirtual |
Calculates the minimal 3D bounding box for the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 245 of file qgscurvepolygon.cpp.
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inlinestatic |
Cast the geom to a QgsCurvePolygon.
Should be used by qgsgeometry_cast<QgsCurvePolygon *>( geometry ).
Definition at line 416 of file qgscurvepolygon.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 1425 of file qgscurvepolygon.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 1430 of file qgscurvepolygon.cpp.
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overridevirtual |
Clears the geometry, ie reset it to a null geometry.
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 107 of file qgscurvepolygon.cpp.
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overridevirtual |
Clones the geometry by performing a deep copy.
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 102 of file qgscurvepolygon.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 1029 of file qgscurvepolygon.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 1438 of file qgscurvepolygon.cpp.
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overridevirtual |
Retrieves the sequence of geometries, rings and nodes.
Implements QgsAbstractGeometry.
Definition at line 949 of file qgscurvepolygon.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 QgsPolygon, and QgsTriangle.
Definition at line 46 of file qgscurvepolygon.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.
Reimplemented in QgsTriangle.
Definition at line 1180 of file qgscurvepolygon.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 58 of file qgscurvepolygon.cpp.
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overridevirtual |
Draws the geometry using the specified QPainter.
p | destination QPainter |
Implements QgsAbstractGeometry.
Definition at line 899 of file qgscurvepolygon.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 1340 of file qgscurvepolygon.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 1324 of file qgscurvepolygon.cpp.
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inline |
Returns a non-const pointer to the curve polygon's exterior ring.
Ownership stays with this QgsCurve.
Definition at line 187 of file qgscurvepolygon.h.
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inline |
Returns the curve polygon's exterior ring.
Definition at line 174 of file qgscurvepolygon.h.
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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.
Definition at line 1401 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::forceClockwise | ( | ) |
Forces the polygon to respect the exterior ring is clockwise, interior rings are counter-clockwise convention.
This convention is used primarily by ESRI software.
Definition at line 826 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::forceCounterClockwise | ( | ) |
Forces the polygon to respect the exterior ring is counter-clockwise, interior rings are clockwise convention.
This convention matches the OGC Simple Features specification.
Definition at line 853 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::forceRHR | ( | ) |
Forces the geometry to respect the Right-Hand-Rule, in which the area that is bounded by the polygon is to the right of the boundary.
In particular, the exterior ring is oriented in a clockwise direction and the interior rings in a counter-clockwise direction.
Definition at line 821 of file qgscurvepolygon.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.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 117 of file qgscurvepolygon.cpp.
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overridevirtual |
Sets the geometry from a WKT string.
Implements QgsAbstractGeometry.
Reimplemented in QgsTriangle.
Definition at line 170 of file qgscurvepolygon.cpp.
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inlineoverridevirtual |
Performs fuzzy distance comparison between this geometry and other using an epsilon.
Traditionally, the comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry. It focuses on the numerical differences or relationships between these values. On the other hand, comparing distances between points considers the actual spatial separation or length between the points, regardless of their coordinate values. This comparison involves measuring the distance between two points using formulas like the distance formula. Here, it's the "distance comparison" (fuzzyDistanceEqual).
Implements QgsAbstractGeometry.
Definition at line 102 of file qgscurvepolygon.h.
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inlineoverridevirtual |
Performs fuzzy comparison between this geometry and other using an epsilon.
The comparison is done by examining the specific values (such as x and y) that define the location of vertices in the geometry.
Implements QgsAbstractGeometry.
Definition at line 98 of file qgscurvepolygon.h.
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overridevirtual |
Returns a unique string representing the geometry type.
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 53 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns true
if the geometry contains curved segments.
Reimplemented from QgsAbstractGeometry.
Definition at line 1225 of file qgscurvepolygon.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.
Reimplemented in QgsTriangle.
Definition at line 1132 of file qgscurvepolygon.cpp.
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inline |
Retrieves an interior ring from the curve polygon.
The first interior ring has index 0.
Definition at line 217 of file qgscurvepolygon.h.
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inline |
Retrieves an interior ring from the curve polygon.
The first interior ring has index 0.
Definition at line 200 of file qgscurvepolygon.h.
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overridevirtual |
Returns true
if the geometry is empty.
Reimplemented from QgsAbstractGeometry.
Definition at line 1021 of file qgscurvepolygon.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.
Reimplemented in QgsTriangle.
Definition at line 1158 of file qgscurvepolygon.cpp.
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overridevirtual |
Returns the number of nodes contained in the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 969 of file qgscurvepolygon.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 1041 of file qgscurvepolygon.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 444 of file qgscurvepolygon.cpp.
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inline |
Returns the number of interior rings contained with the curve polygon.
Definition at line 164 of file qgscurvepolygon.h.
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inlineoverridevirtual |
Implements QgsAbstractGeometry.
Reimplemented in QgsTriangle.
Definition at line 111 of file qgscurvepolygon.h.
QgsCurvePolygon & QgsCurvePolygon::operator= | ( | const QgsCurvePolygon & | p | ) |
Definition at line 84 of file qgscurvepolygon.cpp.
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Implements QgsAbstractGeometry.
Reimplemented in QgsTriangle.
Definition at line 106 of file qgscurvepolygon.h.
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Returns count of parts contained in the geometry.
Implements QgsAbstractGeometry.
Definition at line 1269 of file qgscurvepolygon.cpp.
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Returns the planar, 2-dimensional perimeter of the geometry.
Reimplemented from QgsAbstractGeometry.
Definition at line 493 of file qgscurvepolygon.cpp.
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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 622 of file qgscurvepolygon.cpp.
bool QgsCurvePolygon::removeInteriorRing | ( | int | ringIndex | ) |
Removes an interior ring from the polygon.
The first interior ring has index 0. The corresponding ring is removed from the polygon and deleted. If a ring was successfully removed the function will return true
. It is not possible to remove the exterior ring using this method.
Definition at line 773 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::removeInteriorRings | ( | double | minimumAllowedArea = -1 | ) |
Removes the interior rings from the polygon.
If the minimumAllowedArea parameter is specified then only rings smaller than this minimum area will be removed.
Definition at line 784 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::removeInvalidRings | ( | ) |
Removes any interior rings which are not valid from the polygon.
For example, this removes unclosed rings and rings with less than 4 vertices.
Definition at line 802 of file qgscurvepolygon.cpp.
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Returns the number of rings of which this geometry is built.
Implements QgsAbstractGeometry.
Definition at line 1264 of file qgscurvepolygon.cpp.
double QgsCurvePolygon::roundness | ( | ) | const |
Returns the roundness of the curve polygon.
The returned value is between 0 and 1.
Definition at line 507 of file qgscurvepolygon.cpp.
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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 1242 of file qgscurvepolygon.cpp.
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Returns the length of the segment of the geometry which begins at startVertex.
Implements QgsAbstractGeometry.
Definition at line 1279 of file qgscurvepolygon.cpp.
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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.
ring | new exterior ring. Ownership is transferred to the CurvePolygon. |
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 706 of file qgscurvepolygon.cpp.
void QgsCurvePolygon::setInteriorRings | ( | const QVector< QgsCurve * > & | rings | ) |
Sets all interior rings (takes ownership)
Definition at line 740 of file qgscurvepolygon.cpp.
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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.
Implements QgsAbstractGeometry.
Definition at line 591 of file qgscurvepolygon.cpp.
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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. |
removeRedundantPoints | if true , then points which are redundant (e.g. they represent mid points on a straight line segment) will be skipped (since QGIS 3.38) |
Implements QgsAbstractGeometry.
Definition at line 557 of file qgscurvepolygon.cpp.
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Gets a polygon representation of this surface.
Ownership is transferred to the caller.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 516 of file qgscurvepolygon.cpp.
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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 1356 of file qgscurvepolygon.cpp.
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Returns the geometry converted to the more generic curve type.
E.g. QgsLineString -> QgsCompoundCurve, QgsPolygon -> QgsCurvePolygon, QgsMultiLineString -> QgsMultiCurve, QgsMultiPolygon -> QgsMultiSurface
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon, and QgsTriangle.
Definition at line 1367 of file qgscurvepolygon.cpp.
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Returns a new polygon geometry corresponding to a segmentized approximation of the curve.
tolerance | segmentation tolerance |
toleranceType | maximum segmentation angle or maximum difference between approximation and curve |
Definition at line 686 of file qgscurvepolygon.cpp.
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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 921 of file qgscurvepolygon.cpp.
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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 935 of file qgscurvepolygon.cpp.
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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 1372 of file qgscurvepolygon.cpp.
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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 1413 of file qgscurvepolygon.cpp.
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Returns approximate rotation angle for a vertex.
Usually average angle between adjacent segments.
vertex | the vertex id |
Implements QgsAbstractGeometry.
Definition at line 1247 of file qgscurvepolygon.cpp.
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Returns the point corresponding to a specified vertex id.
Implements QgsAbstractGeometry.
Definition at line 1274 of file qgscurvepolygon.cpp.
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Returns the number of vertices of which this geometry is built.
Implements QgsAbstractGeometry.
Definition at line 1259 of file qgscurvepolygon.cpp.
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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.
Definition at line 986 of file qgscurvepolygon.cpp.
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Returns the length of the QByteArray returned by asWkb()
The optional flags argument specifies flags controlling WKB export behavior
Implements QgsAbstractGeometry.
Reimplemented in QgsPolygon.
Definition at line 254 of file qgscurvepolygon.cpp.
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Definition at line 451 of file qgscurvepolygon.h.
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Definition at line 452 of file qgscurvepolygon.h.