QGIS API Documentation 3.39.0-Master (bca3cdb6021)
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A hillshade filter. More...
#include <qgshillshadefilter.h>
Public Member Functions | |
QgsHillshadeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat, double lightAzimuth=300, double lightAngle=40) | |
float | lightAngle () const |
float | lightAzimuth () const |
float | processNineCellWindow (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33) override |
Calculates output value from nine input values. | |
void | setLightAngle (float angle) |
void | setLightAzimuth (float azimuth) |
Public Member Functions inherited from QgsDerivativeFilter | |
QgsDerivativeFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat) | |
Public Member Functions inherited from QgsNineCellFilter | |
QgsNineCellFilter (const QString &inputFile, const QString &outputFile, const QString &outputFormat) | |
Constructor that takes input file, output file and output format (GDAL string) | |
virtual | ~QgsNineCellFilter ()=default |
double | cellSizeX () const |
double | cellSizeY () const |
double | inputNodataValue () const |
double | outputNodataValue () const |
int | processRaster (QgsFeedback *feedback=nullptr) |
Starts the calculation, reads from mInputFile and stores the result in mOutputFile. | |
void | setCellSizeX (double size) |
void | setCellSizeY (double size) |
void | setInputNodataValue (double value) |
void | setOutputNodataValue (double value) |
void | setZFactor (double factor) |
double | zFactor () const |
Additional Inherited Members | |
Protected Member Functions inherited from QgsDerivativeFilter | |
float | calcFirstDerX (float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33) const |
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) const |
Calculates the first order derivative in y-direction according to Horn (1981) | |
Protected Attributes inherited from QgsNineCellFilter | |
double | mCellSizeX = -1.0 |
double | mCellSizeY = -1.0 |
QString | mInputFile |
float | mInputNodataValue = -1.0 |
The nodata value of the input layer. | |
QString | mOutputFile |
QString | mOutputFormat |
float | mOutputNodataValue = -1.0 |
The nodata value of the output layer. | |
double | mZFactor = 1.0 |
Scale factor for z-value if x-/y- units are different to z-units (111120 for degree->meters and 370400 for degree->feet) | |
A hillshade filter.
Definition at line 29 of file qgshillshadefilter.h.
QgsHillshadeFilter::QgsHillshadeFilter | ( | const QString & | inputFile, |
const QString & | outputFile, | ||
const QString & | outputFormat, | ||
double | lightAzimuth = 300 , |
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double | lightAngle = 40 |
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) |
Definition at line 21 of file qgshillshadefilter.cpp.
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inline |
Definition at line 41 of file qgshillshadefilter.h.
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inline |
Definition at line 39 of file qgshillshadefilter.h.
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overridevirtual |
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.
First index of the input cell is the row, second index is the column
x11 | surrounding cell top left |
x21 | surrounding cell central left |
x31 | surrounding cell bottom left |
x12 | surrounding cell top central |
x22 | the central cell for which the value will be calculated |
x32 | surrounding cell bottom central |
x13 | surrounding cell top right |
x23 | surrounding cell central right |
x33 | surrounding cell bottom right |
Implements QgsDerivativeFilter.
Definition at line 32 of file qgshillshadefilter.cpp.
void QgsHillshadeFilter::setLightAngle | ( | float | angle | ) |
Definition at line 66 of file qgshillshadefilter.cpp.
void QgsHillshadeFilter::setLightAzimuth | ( | float | azimuth | ) |
Definition at line 60 of file qgshillshadefilter.cpp.