QGIS API Documentation  2.99.0-Master (7d4f81d)
Public Member Functions | Protected Attributes | List of all members
QgsTopologyPreservingSimplifier Class Reference

Implementation of GeometrySimplifier using the Douglas-Peucker algorithm. More...

#include <qgsgeometrysimplifier.h>

Inheritance diagram for QgsTopologyPreservingSimplifier:
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Public Member Functions

 QgsTopologyPreservingSimplifier (double tolerance)
 Constructor for QgsTopologyPreservingSimplifier. More...
 
virtual 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 55 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 41 of file qgsgeometrysimplifier.cpp.

Member Function Documentation

◆ simplify()

QgsGeometry QgsTopologyPreservingSimplifier::simplify ( const QgsGeometry geometry) const
overridevirtual

Returns a simplified version the specified geometry.

Implements QgsAbstractGeometrySimplifier.

Definition at line 45 of file qgsgeometrysimplifier.cpp.

Member Data Documentation

◆ mTolerance

double QgsTopologyPreservingSimplifier::mTolerance
protected

Distance tolerance for the simplification.

Definition at line 69 of file qgsgeometrysimplifier.h.


The documentation for this class was generated from the following files: