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48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/** Interface class for interpolations. Interpolators take
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the vertices of a vector layer as base data. The z-Value
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can be an attribute or the z-coordinates in case of 25D types*/
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class QgsInterpolator
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{
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%TypeHeaderCode
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#include "qgsinterpolator.h"
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%End
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public:
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/** Describes the type of input data*/
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enum InputType
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{
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POINTS,
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STRUCTURE_LINES,
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BREAK_LINES
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};
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/** A layer together with the information about interpolation attribute / z-coordinate interpolation and the type (point, structure line, breakline)*/
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struct LayerData
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{
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QgsVectorLayer *vectorLayer;
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bool zCoordInterpolation;
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int interpolationAttribute;
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QgsInterpolator::InputType mInputType;
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};
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QgsInterpolator( const QList<QgsInterpolator::LayerData> &layerData );
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virtual ~QgsInterpolator();
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/** Calculates interpolation value for map coordinates x, y
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@param x x-coordinate (in map units)
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@param y y-coordinate (in map units)
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@param result out: interpolation result
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@return 0 in case of success*/
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virtual int interpolatePoint( double x, double y, double &result ) = 0;
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// @note not available in python bindings
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// const QList<LayerData> &layerData() const;
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protected:
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/** Caches the vertex and value data from the provider. All the vertex data
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will be held in virtual memory
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@return 0 in case of success*/
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int cacheBaseData();
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};
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