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48 lines
1.9 KiB
Plaintext
48 lines
1.9 KiB
Plaintext
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/**
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* Abstract base class for simplify geometries using a specific algorithm
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*/
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class QgsAbstractGeometrySimplifier
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{
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%TypeHeaderCode
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#include "qgsgeometrysimplifier.h"
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%End
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public:
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virtual ~QgsAbstractGeometrySimplifier();
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//! Returns a simplified version the specified geometry
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virtual QgsGeometry simplify( const QgsGeometry& geometry ) const = 0;
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//! Simplifies the specified geometry
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virtual bool simplifyGeometry( QgsGeometry* geometry ) const = 0;
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// MapToPixel simplification helper methods
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public:
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//! Returns whether the device-envelope can be replaced by its BBOX when is applied the specified tolerance
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static bool isGeneralizableByDeviceBoundingBox( const QgsRectangle& envelope, float mapToPixelTol = 1.0f );
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//! Returns whether the device-geometry can be replaced by its BBOX when is applied the specified tolerance
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static bool isGeneralizableByDeviceBoundingBox( const QVector<QPointF>& points, float mapToPixelTol = 1.0f );
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};
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/***************************************************************************/
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/**
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* Implementation of GeometrySimplifier using the Douglas-Peucker algorithm
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*
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* Simplifies a geometry, ensuring that the result is a valid geometry having the same dimension and number of components as the input.
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* The simplification uses a maximum distance difference algorithm similar to the one used in the Douglas-Peucker algorithm.
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*/
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class QgsTopologyPreservingSimplifier : QgsAbstractGeometrySimplifier
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{
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%TypeHeaderCode
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#include "qgsgeometrysimplifier.h"
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%End
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public:
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QgsTopologyPreservingSimplifier( double tolerance );
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virtual ~QgsTopologyPreservingSimplifier();
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//! Returns a simplified version the specified geometry
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virtual QgsGeometry simplify( const QgsGeometry& geometry ) const;
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//! Simplifies the specified geometry
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virtual bool simplifyGeometry( QgsGeometry* geometry ) const;
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};
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