qgsalignraster.h

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/***************************************************************************
  qgsalignraster.h
  --------------------------------------
  Date                 : June 2015
  Copyright            : (C) 2015 by Martin Dobias
  Email                : wonder dot sk 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 QGSALIGNRASTER_H
#define QGSALIGNRASTER_H

#include <QList>
#include <QPointF>
#include <QSizeF>
#include <QString>

class QgsRectangle;

typedef void* GDALDatasetH;


class ANALYSIS_EXPORT QgsAlignRaster
{
  public:
    QgsAlignRaster();

    struct ANALYSIS_EXPORT RasterInfo
    {
    public:
      RasterInfo( const QString& layerpath );
      ~RasterInfo();

      bool isValid() const { return nullptr != mDataset; }

      QString crs() const { return mCrsWkt; }
      QSize rasterSize() const { return QSize( mXSize, mYSize ); }
      int bandCount() const { return mBandCnt; }
      QSizeF cellSize() const;
      QPointF gridOffset() const;
      QgsRectangle extent() const;
      QPointF origin() const;

      void dump() const;

      double identify( double mx, double my );

    protected:
      GDALDatasetH mDataset;
      QString mCrsWkt;
      double mGeoTransform[6];
      int mXSize, mYSize;
      int mBandCnt;

    private:

      RasterInfo( const RasterInfo& rh );
      RasterInfo& operator=( const RasterInfo& rh );

      friend class QgsAlignRaster;
    };


    enum ResampleAlg
    {
      RA_NearestNeighbour = 0, 
      RA_Bilinear = 1,       
      RA_Cubic = 2,          
      RA_CubicSpline = 3,    
      RA_Lanczos = 4,        
      RA_Average = 5,        
      RA_Mode = 6            
    };

    struct Item
    {
      Item( const QString& input, const QString& output )
          : inputFilename( input )
          , outputFilename( output )
          , resampleMethod( RA_NearestNeighbour )
          , rescaleValues( false )
          , srcCellSizeInDestCRS( 0.0 )
      {}

      QString inputFilename;
      QString outputFilename;
      ResampleAlg resampleMethod;
      bool rescaleValues;

      // private part

      double srcCellSizeInDestCRS;
    };
    typedef QList<Item> List;

    struct ProgressHandler
    {
      virtual bool progress( double complete ) = 0;

      virtual ~ProgressHandler() {}
    };

    void setProgressHandler( ProgressHandler* progressHandler ) { mProgressHandler = progressHandler; }
    ProgressHandler* progressHandler() const { return mProgressHandler; }

    void setRasters( const List& list ) { mRasters = list; }
    List rasters() const { return mRasters; }

    void setGridOffset( QPointF offset ) { mGridOffsetX = offset.x(); mGridOffsetY = offset.y(); }
    QPointF gridOffset() const { return QPointF( mGridOffsetX, mGridOffsetY ); }

    void setCellSize( double x, double y ) { return setCellSize( QSizeF( x, y ) ); }
    void setCellSize( QSizeF size ) { mCellSizeX = size.width(); mCellSizeY = size.height(); }
    QSizeF cellSize() const { return QSizeF( mCellSizeX, mCellSizeY ); }

    void setDestinationCRS( const QString& crsWkt ) { mCrsWkt = crsWkt; }
    QString destinationCRS() const { return mCrsWkt; }

    void setClipExtent( double xmin, double ymin, double xmax, double ymax );
    void setClipExtent( const QgsRectangle& extent );
    QgsRectangle clipExtent() const;

    bool setParametersFromRaster( const RasterInfo& rasterInfo, const QString& customCRSWkt = QString(), QSizeF customCellSize = QSizeF(), QPointF customGridOffset = QPointF( -1, -1 ) );
    bool setParametersFromRaster( const QString& filename, const QString& customCRSWkt = QString(), QSizeF customCellSize = QSizeF(), QPointF customGridOffset = QPointF( -1, -1 ) );

    bool checkInputParameters();

    QSize alignedRasterSize() const;
    QgsRectangle alignedRasterExtent() const;

    bool run();

    QString errorMessage() const { return mErrorMessage; }

    void dump() const;

    int suggestedReferenceLayer() const;

  protected:

    bool createAndWarp( const Item& raster );

    static bool suggestedWarpOutput( const RasterInfo& info, const QString& destWkt, QSizeF* cellSize = nullptr, QPointF* gridOffset = nullptr, QgsRectangle* rect = nullptr );

  protected:

    // set by the client

    ProgressHandler* mProgressHandler;

    QString mErrorMessage;

    List mRasters;

    QString mCrsWkt;
    double mCellSizeX, mCellSizeY;
    double mGridOffsetX, mGridOffsetY;

    double mClipExtent[4];

    // derived data from other members

    double mGeoTransform[6];
    int mXSize, mYSize;

};


#endif // QGSALIGNRASTER_H