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