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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 
24 class ANALYSIS_EXPORT QgsDerivativeFilter : public QgsNineCellFilter
25 {
26  public:
27  QgsDerivativeFilter( const QString& inputFile, const QString& outputFile, const QString& outputFormat );
28  virtual ~QgsDerivativeFilter();
29  //to be implemented by subclasses
30  virtual float processNineCellWindow( float* x11, float* x21, float* x31,
31  float* x12, float* x22, float* x32,
32  float* x13, float* x23, float* x33 ) = 0;
33 
34  protected:
36  float calcFirstDerX( float* x11, float* x21, float* x31, float* x12, float* x22, float* x32, float* x13, float* x23, float* x33 );
38  float calcFirstDerY( float* x11, float* x21, float* x31, float* x12, float* x22, float* x32, float* x13, float* x23, float* x33 );
39 };
40 
41 #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...