qgsterraindownloader.h

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/***************************************************************************
  qgsterraindownloader.h
  --------------------------------------
  Date                 : March 2019
  Copyright            : (C) 2019 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 QGSTERRAINDOWNLOADER_H
#define QGSTERRAINDOWNLOADER_H
 
#include "qgis_3d.h"
 
#include <memory>
#include <QByteArray>
#include <QImage>
 
#include "qgscoordinatetransformcontext.h"
 
class QgsRectangle;
class QgsCoordinateReferenceSystem;
class QgsRasterLayer;
class QgsCoordinateTransformContext;
 
#define SIP_NO_FILE
 
class _3D_EXPORT QgsTerrainDownloader
{
 
  public:
 
    QgsTerrainDownloader( const QgsCoordinateTransformContext  &transformContext );
 
    ~QgsTerrainDownloader();
 
    typedef struct
    {
      QString uri;  
      int zMin = 0;  
      int zMax = 0;  
    } DataSource;
 
    static DataSource defaultDataSource();
 
    void setDataSource( const DataSource &ds );
 
    DataSource dataSource() const { return mDataSource; }
 
    QByteArray getHeightMap( const QgsRectangle &extentOrig, int res, const QgsCoordinateReferenceSystem &destCrs, const QgsCoordinateTransformContext &context = QgsCoordinateTransformContext(), QString tmpFilenameImg = QString(), QString tmpFilenameTif = QString() );
 
  private:
 
    double findBestTileResolution( double requestedMupp );
 
    static void adjustExtentAndResolution( double mupp, const QgsRectangle &extentOrig, QgsRectangle &extent, int &res );
 
    static void tileImageToHeightMap( const QImage &img, QByteArray &heightMap );
 
  private:
    DataSource mDataSource;
    std::unique_ptr<QgsRasterLayer> mOnlineDtm;
    double mXSpan = 0;   
};
 
#endif // QGSTERRAINDOWNLOADER_H