Quantum GIS API Documentation  1.7.4
src/analysis/raster/qgsrastercalculator.h
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00001 /***************************************************************************
00002                           qgsrastercalculator.h  -  description
00003                           ---------------------
00004     begin                : September 28th, 2010
00005     copyright            : (C) 2010 by Marco Hugentobler
00006     email                : marco dot hugentobler at sourcepole 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 #ifndef QGSRASTERCALCULATOR_H
00019 #define QGSRASTERCALCULATOR_H
00020 
00021 #include "qgsfield.h"
00022 #include "qgsrectangle.h"
00023 #include <QString>
00024 #include <QVector>
00025 #include "gdal.h"
00026 
00027 class QgsRasterLayer;
00028 class QProgressDialog;
00029 
00030 
00031 struct ANALYSIS_EXPORT QgsRasterCalculatorEntry
00032 {
00033   QString ref; //name
00034   QgsRasterLayer* raster; //pointer to rasterlayer
00035   int bandNumber; //raster band number
00036 };
00037 
00039 class ANALYSIS_EXPORT QgsRasterCalculator
00040 {
00041   public:
00042     QgsRasterCalculator( const QString& formulaString, const QString& outputFile, const QString& outputFormat,
00043                          const QgsRectangle& outputExtent, int nOutputColumns, int nOutputRows, const QVector<QgsRasterCalculatorEntry>& rasterEntries );
00044     ~QgsRasterCalculator();
00045 
00049     int processCalculation( QProgressDialog* p = 0 );
00050 
00051   private:
00052     //default constructor forbidden. We need formula, output file, output format and output raster resolution obligatory
00053     QgsRasterCalculator();
00054 
00057     GDALDriverH openOutputDriver();
00058 
00061     GDALDatasetH openOutputFile( GDALDriverH outputDriver );
00062 
00074     void readRasterPart( double* targetGeotransform,
00075                          int xOffset, int yOffset,
00076                          int nCols, int nRows,
00077                          double* sourceTransform,
00078                          GDALRasterBandH sourceBand,
00079                          float* rasterBuffer );
00080 
00082     bool transformationsEqual( double* t1, double* t2 ) const;
00083 
00086     void outputGeoTransform( double* transform ) const;
00087 
00088     QString mFormulaString;
00089     QString mOutputFile;
00090     QString mOutputFormat;
00091 
00093     QgsRectangle mOutputRectangle;
00095     int mNumOutputColumns;
00097     int mNumOutputRows;
00098 
00099     /***/
00100     QVector<QgsRasterCalculatorEntry> mRasterEntries;
00101 };
00102 
00103 #endif // QGSRASTERCALCULATOR_H
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