Inverse distance weight interpolator. More...

#include <qgsidwinterpolator.h>

Inheritance diagram for QgsIDWInterpolator:

Public Member Functions
	QgsIDWInterpolator (const QList< QgsInterpolator::LayerData > &layerData)
	Constructor for QgsIDWInterpolator, with the specified layerData sources. More...

double	distanceCoefficient () const
	Returns the distance coefficient, the parameter that sets how the values are weighted with distance. More...

int	interpolatePoint (double x, double y, double &result, QgsFeedback *feedback=nullptr) override
	Calculates interpolation value for map coordinates x, y. More...

void	setDistanceCoefficient (double coefficient)
	Sets the distance coefficient, the parameter that sets how the values are weighted with distance. More...

Public Member Functions inherited from QgsInterpolator
	QgsInterpolator (const QList< QgsInterpolator::LayerData > &layerData)

virtual	~QgsInterpolator ()=default

QList< LayerData >	layerData () const

Additional Inherited Members
Public Types inherited from QgsInterpolator
enum	Result { Success = 0, Canceled, InvalidSource, FeatureGeometryError }
	Result of an interpolation operation. More...

enum	SourceType { SourcePoints, SourceStructureLines, SourceBreakLines }
	Describes the type of input data. More...

enum	ValueSource { ValueAttribute, ValueZ, ValueM }
	Source for interpolated values from features. More...

Protected Member Functions inherited from QgsInterpolator
Result	cacheBaseData (QgsFeedback *feedback=nullptr)
	Caches the vertex and value data from the provider. More...

Protected Attributes inherited from QgsInterpolator
QVector< QgsInterpolatorVertexData >	mCachedBaseData
	Cached vertex data for input sources. More...

bool	mDataIsCached = false
	Flag that tells if the cache already has been filled. More...

QList< LayerData >	mLayerData
	Information about the input vector layers and the attributes (or z-values) that are used for interpolation. More...

Detailed Description

Inverse distance weight interpolator.

Definition at line 29 of file qgsidwinterpolator.h.

Constructor & Destructor Documentation

◆ QgsIDWInterpolator()

QgsIDWInterpolator::QgsIDWInterpolator ( const QList< QgsInterpolator::LayerData > & layerData )

Constructor for QgsIDWInterpolator, with the specified layerData sources.

Definition at line 23 of file qgsidwinterpolator.cpp.

Member Function Documentation

◆ distanceCoefficient()

double QgsIDWInterpolator::distanceCoefficient ( ) const

inline

Returns the distance coefficient, the parameter that sets how the values are weighted with distance.

Smaller values mean sharper peaks at the data points. The default is a coefficient of 2.

Point values are weighted by 1 / ( distance ^ coefficient ).

See also: setDistanceCoefficient()

Since: QGIS 3.0

Definition at line 61 of file qgsidwinterpolator.h.

◆ interpolatePoint()

int QgsIDWInterpolator::interpolatePoint	(	double	x,
		double	y,
		double &	result,
		QgsFeedback *	feedback = `nullptr`
	)

overridevirtual

Calculates interpolation value for map coordinates x, y.

Parameters

x	x-coordinate (in map units)
y	y-coordinate (in map units)
result	interpolation result
feedback	optional feedback object for progress and cancellation support

Returns: 0 in case of success

Implements QgsInterpolator.

Definition at line 27 of file qgsidwinterpolator.cpp.

◆ setDistanceCoefficient()

void QgsIDWInterpolator::setDistanceCoefficient ( double coefficient )

inline

Sets the distance coefficient, the parameter that sets how the values are weighted with distance.

Smaller values mean sharper peaks at the data points.

Point values are weighted by 1 / ( distance ^ coefficient ).

See also: distanceCoefficient()

Since: QGIS 3.0

Definition at line 49 of file qgsidwinterpolator.h.

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

/tmp/buildd/qgis-3.8.0+99unstable/src/analysis/interpolation/qgsidwinterpolator.h
/tmp/buildd/qgis-3.8.0+99unstable/src/analysis/interpolation/qgsidwinterpolator.cpp

Public Member Functions