qgsrastercalculator.h

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/***************************************************************************
                          qgsrastercalculator.h  -  description
                          ---------------------
    begin                : September 28th, 2010
    copyright            : (C) 2010 by Marco Hugentobler
    email                : marco dot hugentobler at sourcepole dot ch
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSRASTERCALCULATOR_H
#define QGSRASTERCALCULATOR_H

#include "qgsrectangle.h"
#include "qgscoordinatereferencesystem.h"
#include <QString>
#include <QVector>
#include "gdal.h"
#include "qgis_analysis.h"
#include "qgsogrutils.h"

class QgsRasterLayer;
class QgsFeedback;

class ANALYSIS_EXPORT QgsRasterCalculatorEntry
{

  public:

    QString ref;

    QgsRasterLayer *raster = nullptr;

    int bandNumber = 1;
};

class ANALYSIS_EXPORT QgsRasterCalculator
{
  public:

    enum Result
    {
      Success = 0, 
      CreateOutputError = 1, 
      InputLayerError = 2, 
      Canceled = 3, 
      ParserError = 4, 
      MemoryError = 5, 
      BandError = 6, 
    };

    QgsRasterCalculator( const QString &formulaString, const QString &outputFile, const QString &outputFormat,
                         const QgsRectangle &outputExtent, int nOutputColumns, int nOutputRows, const QVector<QgsRasterCalculatorEntry> &rasterEntries );

    QgsRasterCalculator( const QString &formulaString, const QString &outputFile, const QString &outputFormat,
                         const QgsRectangle &outputExtent, const QgsCoordinateReferenceSystem &outputCrs, int nOutputColumns, int nOutputRows, const QVector<QgsRasterCalculatorEntry> &rasterEntries );

    Result processCalculation( QgsFeedback *feedback = nullptr );

    QString lastError() const;

  private:
    //default constructor forbidden. We need formula, output file, output format and output raster resolution obligatory
    QgsRasterCalculator() = delete;

    GDALDriverH openOutputDriver();

    gdal::dataset_unique_ptr openOutputFile( GDALDriverH outputDriver );

    void outputGeoTransform( double *transform ) const;

    QString mFormulaString;
    QString mOutputFile;
    QString mOutputFormat;

    QgsRectangle mOutputRectangle;
    QgsCoordinateReferenceSystem mOutputCrs;

    int mNumOutputColumns = 0;
    int mNumOutputRows = 0;

    QString mLastError;

    /***/
    QVector<QgsRasterCalculatorEntry> mRasterEntries;
};

#endif // QGSRASTERCALCULATOR_H