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

#include <qgsgeometrysimplifier.h>

Inheritance diagram for QgsTopologyPreservingSimplifier:

Public Member Functions
	QgsTopologyPreservingSimplifier (double tolerance)
	Constructor for QgsTopologyPreservingSimplifier.

QgsAbstractGeometry *	simplify (const QgsAbstractGeometry *geometry) const override
	Returns a simplified version the specified geometry.

QgsGeometry	simplify (const QgsGeometry &geometry) const override
	Returns a simplified version the specified geometry.

Public Member Functions inherited from QgsAbstractGeometrySimplifier
virtual	~QgsAbstractGeometrySimplifier ()=default

Protected Attributes
double	mTolerance
	Distance tolerance for the simplification.

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.

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.

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]

QgsAbstractGeometry * QgsTopologyPreservingSimplifier::simplify ( const QgsAbstractGeometry * geometry ) const

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]

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

overridevirtual

Returns a simplified version the specified geometry.

Implements QgsAbstractGeometrySimplifier.

Definition at line 46 of file qgsgeometrysimplifier.cpp.

Member Data Documentation

◆ mTolerance

double QgsTopologyPreservingSimplifier::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-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsgeometrysimplifier.h
/build/qgis-3.41.0+git20241225+af5edcb665c+99sid/src/core/qgsgeometrysimplifier.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members