QgsTopologyPreservingSimplifier Class Reference

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. 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 57 of file qgsgeometrysimplifier.h.

Constructor & Destructor Documentation

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

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

double QgsTopologyPreservingSimplifier::mTolerance

protected

Distance tolerance for the simplification.

Definition at line 71 of file qgsgeometrysimplifier.h.

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

• /build/qgis-3.4.15+24xenial/src/core/qgsgeometrysimplifier.h
• /build/qgis-3.4.15+24xenial/src/core/qgsgeometrysimplifier.cpp