qgsreclassifyutils.h

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/***************************************************************************
                         qgsreclassifyutils.h
                         ---------------------
    begin                : June, 2018
    copyright            : (C) 2018 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 QGSRECLASSIFYUTILS
#define QGSRECLASSIFYUTILS
 
 
#include "qgis_analysis.h"
#include "qgis_sip.h"
#include "qgsrasterrange.h"
 
#include <QVector>
 
#define SIP_NO_FILE
 
class QgsRasterInterface;
class QgsProcessingFeedback;
class QgsRasterDataProvider;
class QgsRectangle;


class ANALYSIS_EXPORT QgsReclassifyUtils
{
  public:
    class RasterClass : public QgsRasterRange
    {
      public:
        RasterClass() = default;

        RasterClass( double minValue, double maxValue, QgsRasterRange::BoundsType type, double value )
          : QgsRasterRange( minValue, maxValue, type )
          , value( value )
        {}

        double value = 0;
    };

    static void reportClasses( const QVector<RasterClass> &classes, QgsProcessingFeedback *feedback );

    static void checkForOverlaps( const QVector<RasterClass> &classes, QgsProcessingFeedback *feedback );

    static void reclassify(
      const QVector<RasterClass> &classes,
      QgsRasterInterface *sourceRaster,
      int band,
      const QgsRectangle &extent,
      int sourceWidthPixels,
      int sourceHeightPixels,
      std::unique_ptr<QgsRasterDataProvider> destinationRaster,
      double destNoDataValue,
      bool useNoDataForMissingValues,
      QgsProcessingFeedback *feedback = nullptr
    );

    static double reclassifyValue( const QVector<RasterClass> &classes, double input, bool &reclassified )
    {
      reclassified = false;
      for ( const QgsReclassifyUtils::RasterClass &c : classes )
      {
        if ( c.contains( input ) )
        {
          reclassified = true;
          return c.value;
        }
      }
      return input;
    }
};
 
Q_DECLARE_TYPEINFO( QgsReclassifyUtils::RasterClass, Q_MOVABLE_TYPE );
 

 
#endif // QGSRECLASSIFYUTILS