Implementation of GeometrySimplifier using the Douglas-Peucker algorithm. More...
#include <qgsgeometrysimplifier.h>
Public Member Functions | |
| QgsTopologyPreservingSimplifier (double tolerance) | |
| Constructor for QgsTopologyPreservingSimplifier. More... | |
| QgsAbstractGeometry * | simplify (const QgsAbstractGeometry *geometry) const override |
| Returns a simplified version the specified geometry. More... | |
| QgsGeometry | simplify (const QgsGeometry &geometry) const override |
| Returns a simplified version the specified geometry. More... | |
 Public Member Functions inherited from QgsAbstractGeometrySimplifier | |
| virtual | ~QgsAbstractGeometrySimplifier ()=default |
Protected Attributes | |
| double | mTolerance |
| Distance tolerance for the simplification. More... | |
Additional Inherited Members | |
| Static Public Member Functions inherited from QgsAbstractGeometrySimplifier | |
| static bool | isGeneralizableByDeviceBoundingBox (const QgsRectangle &envelope, float mapToPixelTol=1.0f) |
| Returns whether the device-envelope can be replaced by its BBOX when is applied the specified tolerance. More... | |
| static bool | isGeneralizableByDeviceBoundingBox (const QVector< QPointF > &points, float mapToPixelTol=1.0f) |
| Returns whether the device-geometry can be replaced by its BBOX when is applied the specified tolerance. More... | |
Detailed Description
Implementation of GeometrySimplifier using the Douglas-Peucker algorithm.
Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input. The simplification uses a maximum distance difference algorithm similar to the one used in the Douglas-Peucker algorithm.
Definition at line 70 of file qgsgeometrysimplifier.h.
Constructor & Destructor Documentation
◆ QgsTopologyPreservingSimplifier()
| QgsTopologyPreservingSimplifier::QgsTopologyPreservingSimplifier | ( | double | tolerance | ) |
Constructor for QgsTopologyPreservingSimplifier.
The tolerance parameter is specified in layer units.
Definition at line 42 of file qgsgeometrysimplifier.cpp.
Member Function Documentation
◆ simplify() [1/2]
|
overridevirtual |
Returns a simplified version the specified geometry.
Will return nullptr if no simplification is to be performed to the geometry.
Caller takes ownership of the returned geometry.
- Since
- QGIS 3.18
Implements QgsAbstractGeometrySimplifier.
Definition at line 51 of file qgsgeometrysimplifier.cpp.
◆ simplify() [2/2]
|
overridevirtual |
Returns a simplified version the specified geometry.
Implements QgsAbstractGeometrySimplifier.
Definition at line 46 of file qgsgeometrysimplifier.cpp.
Member Data Documentation
◆ mTolerance
|
protected |
Distance tolerance for the simplification.
Definition at line 85 of file qgsgeometrysimplifier.h.
The documentation for this class was generated from the following files:
- /build/qgis-3.20.0+99unstable/src/core/qgsgeometrysimplifier.h
- /build/qgis-3.20.0+99unstable/src/core/qgsgeometrysimplifier.cpp
