Quantum GIS API Documentation
1.8
|
Adds the ability to calculate derivatives in x- and y-directions. More...
#include <qgsderivativefilter.h>
Public Member Functions | |
QgsDerivativeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat) | |
virtual | ~QgsDerivativeFilter () |
virtual float | processNineCellWindow (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33)=0 |
Calculates output value from nine input values. | |
Protected Member Functions | |
float | calcFirstDerX (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33) |
Calculates the first order derivative in x-direction according to Horn (1981) | |
float | calcFirstDerY (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33) |
Calculates the first order derivative in y-direction according to Horn (1981) |
Adds the ability to calculate derivatives in x- and y-directions.
Needs to be subclassed (e.g. for slope and aspect)
Definition at line 24 of file qgsderivativefilter.h.
QgsDerivativeFilter::QgsDerivativeFilter | ( | const QString & | inputFile, |
const QString & | outputFile, | ||
const QString & | outputFormat | ||
) |
Definition at line 20 of file qgsderivativefilter.cpp.
QgsDerivativeFilter::~QgsDerivativeFilter | ( | ) | [virtual] |
Definition at line 26 of file qgsderivativefilter.cpp.
float QgsDerivativeFilter::calcFirstDerX | ( | float * | x11, |
float * | x21, | ||
float * | x31, | ||
float * | x12, | ||
float * | x22, | ||
float * | x32, | ||
float * | x13, | ||
float * | x23, | ||
float * | x33 | ||
) | [protected] |
Calculates the first order derivative in x-direction according to Horn (1981)
Definition at line 31 of file qgsderivativefilter.cpp.
References QgsNineCellFilter::mCellSizeX, QgsNineCellFilter::mInputNodataValue, QgsNineCellFilter::mOutputNodataValue, and QgsNineCellFilter::mZFactor.
Referenced by QgsAspectFilter::processNineCellWindow(), QgsSlopeFilter::processNineCellWindow(), and QgsHillshadeFilter::processNineCellWindow().
float QgsDerivativeFilter::calcFirstDerY | ( | float * | x11, |
float * | x21, | ||
float * | x31, | ||
float * | x12, | ||
float * | x22, | ||
float * | x32, | ||
float * | x13, | ||
float * | x23, | ||
float * | x33 | ||
) | [protected] |
Calculates the first order derivative in y-direction according to Horn (1981)
Definition at line 98 of file qgsderivativefilter.cpp.
References QgsNineCellFilter::mCellSizeY, QgsNineCellFilter::mInputNodataValue, QgsNineCellFilter::mOutputNodataValue, and QgsNineCellFilter::mZFactor.
Referenced by QgsAspectFilter::processNineCellWindow(), QgsSlopeFilter::processNineCellWindow(), and QgsHillshadeFilter::processNineCellWindow().
virtual float QgsDerivativeFilter::processNineCellWindow | ( | float * | x11, |
float * | x21, | ||
float * | x31, | ||
float * | x12, | ||
float * | x22, | ||
float * | x32, | ||
float * | x13, | ||
float * | x23, | ||
float * | x33 | ||
) | [pure virtual] |
Calculates output value from nine input values.
The input values and the output value can be equal to the nodata value if not present or outside of the border. Must be implemented by subclasses
Implements QgsNineCellFilter.
Implemented in QgsAspectFilter, QgsHillshadeFilter, and QgsSlopeFilter.