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67 lines
3.4 KiB
Plaintext
67 lines
3.4 KiB
Plaintext
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/** This class contains information how to simplify geometries fetched from a vector layer
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* @note added in 2.2
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*/
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class QgsVectorSimplifyMethod
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{
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%TypeHeaderCode
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#include "qgsvectorsimplifymethod.h"
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%End
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public:
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//! construct a default object
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QgsVectorSimplifyMethod();
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//! copy constructor
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QgsVectorSimplifyMethod( const QgsVectorSimplifyMethod& rh );
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/** Simplification flags for fast rendering of features */
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enum SimplifyHint
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{
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NoSimplification, //!< No simplification can be applied
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GeometrySimplification, //!< The geometries can be simplified using the current map2pixel context state
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AntialiasingSimplification, //!< The geometries can be rendered with 'AntiAliasing' disabled because of it is '1-pixel size'
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FullSimplification, //!< All simplification hints can be applied ( Geometry + AA-disabling )
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};
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typedef QFlags<QgsVectorSimplifyMethod::SimplifyHint> SimplifyHints;
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/** Sets the simplification hints of the vector layer managed */
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void setSimplifyHints( const QFlags<QgsVectorSimplifyMethod::SimplifyHint>& simplifyHints );
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/** Gets the simplification hints of the vector layer managed */
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QFlags<QgsVectorSimplifyMethod::SimplifyHint> simplifyHints() const;
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/** Types of local simplification algorithms that can be used */
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enum SimplifyAlgorithm
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{
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Distance = 0, //!< The simplification uses the distance between points to remove duplicate points
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SnapToGrid = 1, //!< The simplification uses a grid (similar to ST_SnapToGrid) to remove duplicate points
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Visvalingam = 2, //!< The simplification gives each point in a line an importance weighting, so that least important points are removed first
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};
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/** Sets the local simplification algorithm of the vector layer managed */
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void setSimplifyAlgorithm( const SimplifyAlgorithm& simplifyAlgorithm );
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/** Gets the local simplification algorithm of the vector layer managed */
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SimplifyAlgorithm simplifyAlgorithm() const;
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/** Sets the tolerance of simplification in map units. Represents the maximum distance in map units between two coordinates which can be considered equal */
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void setTolerance( double tolerance );
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/** Gets the tolerance of simplification in map units. Represents the maximum distance in map units between two coordinates which can be considered equal */
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double tolerance() const;
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/** Sets the simplification threshold of the vector layer managed */
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void setThreshold( float threshold );
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/** Gets the simplification threshold of the vector layer managed */
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float threshold() const;
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/** Sets where the simplification executes, after fetch the geometries from provider, or when supported, in provider before fetch the geometries */
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void setForceLocalOptimization( bool localOptimization );
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/** Gets where the simplification executes, after fetch the geometries from provider, or when supported, in provider before fetch the geometries */
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bool forceLocalOptimization() const;
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/** Sets the maximum scale at which the layer should be simplified */
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void setMaximumScale( float maximumScale );
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/** Gets the maximum scale at which the layer should be simplified */
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float maximumScale() const;
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};
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QFlags<QgsVectorSimplifyMethod::SimplifyHint> operator|( QgsVectorSimplifyMethod::SimplifyHint f1, QFlags<QgsVectorSimplifyMethod::SimplifyHint> f2 );
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