QGIS API Documentation  2.99.0-Master (ae4d26a)
qgsderivativefilter.h
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1 /***************************************************************************
2  qgsderivativefilter.h - description
3  ---------------------
4  begin : August 7th, 2009
5  copyright : (C) 2009 by Marco Hugentobler
6  email : marco dot hugentobler at karto dot baug dot ethz dot ch
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSDERIVATIVEFILTER_H
19 #define QGSDERIVATIVEFILTER_H
20 
21 #include "qgsninecellfilter.h"
22 #include "qgis_analysis.h"
23 
27 class ANALYSIS_EXPORT QgsDerivativeFilter : public QgsNineCellFilter
28 {
29  public:
30  QgsDerivativeFilter( const QString &inputFile, const QString &outputFile, const QString &outputFormat );
31  virtual ~QgsDerivativeFilter() = default;
32  //to be implemented by subclasses
33  virtual float processNineCellWindow( float *x11, float *x21, float *x31,
34  float *x12, float *x22, float *x32,
35  float *x13, float *x23, float *x33 ) override = 0;
36 
37  protected:
39  float calcFirstDerX( float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33 );
41  float calcFirstDerY( float *x11, float *x21, float *x31, float *x12, float *x22, float *x32, float *x13, float *x23, float *x33 );
42 };
43 
44 #endif // QGSDERIVATIVEFILTER_H
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.
Adds the ability to calculate derivatives in x- and y-directions.
Base class for raster analysis methods that work with a 3x3 cell filter and calculate the value of ea...