Quantum GIS API Documentation  1.8
src/analysis/raster/qgsslopefilter.cpp
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00001 /***************************************************************************
00002                           qgsslopefilter.h  -  description
00003                           --------------------------------
00004     begin                : August 7th, 2009
00005     copyright            : (C) 2009 by Marco Hugentobler
00006     email                : marco dot hugentobler at karto dot baug dot ethz dot ch
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #include "qgsslopefilter.h"
00019 
00020 QgsSlopeFilter::QgsSlopeFilter( const QString& inputFile, const QString& outputFile, const QString& outputFormat )
00021     : QgsDerivativeFilter( inputFile, outputFile, outputFormat )
00022 {
00023 
00024 }
00025 
00026 QgsSlopeFilter::~QgsSlopeFilter()
00027 {
00028 
00029 }
00030 
00031 float QgsSlopeFilter::processNineCellWindow( float* x11, float* x21, float* x31,
00032     float* x12, float* x22, float* x32, float* x13, float* x23, float* x33 )
00033 {
00034   float derX = calcFirstDerX( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
00035   float derY = calcFirstDerY( x11, x21, x31, x12, x22, x32, x13, x23, x33 );
00036 
00037   if ( derX == mOutputNodataValue || derY == mOutputNodataValue )
00038   {
00039     return mOutputNodataValue;
00040   }
00041 
00042   return atan( sqrt( derX * derX + derY * derY ) ) * 180.0 / M_PI;
00043 }
00044 
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