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 <memory>
 
#include "qgis_3d.h"
#include "qgscoordinatetransformcontext.h"
 
#include <QByteArray>
#include <QImage>
 
#define SIP_NO_FILE
 
class QgsRectangle;
class QgsCoordinateReferenceSystem;
class QgsRasterLayer;
class QgsCoordinateTransformContext;
 

class _3D_EXPORT QgsTerrainDownloader
{
  public:
    QgsTerrainDownloader( const QgsCoordinateTransformContext &transformContext );
 
    ~QgsTerrainDownloader();

    struct DataSource
    {
        QString uri;  
        int zMin = 0; 
        int zMax = 0; 
    };

    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 ) const;

    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