DtCDBTile.h

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/****************************************************************************** 
** Copyright (c) 2018 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 

#pragma once


#include <string>
#include <osgEarth/TileSource>
#include <osgearth_cdb_utils/DtCDBExport.h>
#include <osgearth_cdb_utils/DtCDBTileCache.h>
#include <osgearth_cdb_utils/DtCDBDatasets.h>
#include <osgearth_cdb_utils/DtCDBTileVerbose.h>

namespace makVrv { namespace oe { namespace CDB
{
    using namespace osgEarth;

    // IMPORTANT NOTES : here are the match between OSG LOD and CDB LOD
    // 
    // OSG LOD resolution per pixel CDB LOD  resolution per pixel between -50 to 50
    // 0       0.7031250000            -9      0.5000000000
    // 1       0.3515625000            -8      0.2500000000
    // 2       0.1757812500            -7      0.1250000000
    // 3       0.0878906250            -6      0.0625000000
    // 4       0.0439453125            -5      0.0312500000
    // 5       0.0219726563            -4      0.0156250000
    // 6       0.0109863281            -3      0.0078125000
    // 7       0.0054931641            -2      0.0039062500
    // 8       0.0027465820            -1      0.0019531250
    // 9       0.0013732910            0       0.0009765625
    // 10         0.0006866455            1       0.0004882813
    // 11         0.0003433228            2       0.0002441406
    // 12         0.0001716614            3       0.0001220703
    // 13         0.0000858307            4       0.0000610352
    // 14         0.0000429153            5       0.0000305176
    // 15         0.0000214577            6       0.0000152588
    // 16         0.0000107288            7       0.0000076294
    // 17         0.0000053644            8       0.0000038147
    // 18         0.0000026822            9       0.0000019073
    // etc ...
    #define OSG_CDB_LOD_OFFSET 9 


    class DT_DLL_OSGEARTH_CDB_UTILS CDBTile
    {
    public:

        CDBTile(const std::string& CdbRootDir);

        virtual ~CDBTile();

        bool getLatLon(unsigned int wsg84_lod, double coord_x, double coord_y,
            std::string& lat_str, std::string& lon_str, int& cdb_lod, int& DLonZone, std::string& path_lod_str, CDBTileCache* TileCachePtr);

        bool getPathComponents(unsigned int wgs84_lod, double x_coord, double y_coord,
            CDBTileVerbose& key, std::string& lod_str, std::string& path_lod_str,
            CDBTileCache* TileCachePtr);

        static int calcDLonZone(double coord_y);

        int  getNumTilesFoundOnDisk(const std::vector<TileKey>& intersectingKeys, 
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2, int lod, CDBTileCache* TileCachePtr);

        bool getTileName(unsigned int wgs84_lod, double x_coord, double y_coord,
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2,
            std::string& tile_name, CDBTileCache* TileCachePtr, bool exitIfGeocellDoesNotExist = false);
     
        std::string getTileFullPath(int lat, int lon,
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2,
            int lod, int uref, int rref, bool secondaryExt = false) const;

        std::string getTileFullPath(const CDBTileVerbose& key,
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2,
            int lod, bool secondaryExt = false) const;

        std::string getTileFolder(const CDBTileVerbose& key, const std::string& lod_string, int CdbDatasetCode) const;

        std::string getTileFilename(const CDBTileVerbose& key, 
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2,
            const std::string& lod_string, 
            const std::string& FACC, const std::string& FSC, const std::string& modelName) const;

        std::string getTileFilename(const CDBTileVerbose& key,
            int CdbDatasetCode, int CdbComponentSelector1, int CdbComponentSelector2,
            const std::string& lod_string, bool secondaryExt = false) const;

        std::string getLodString(int lod) const;

        std::string getLodFolderString(int lod) const;
        
        std::string getLatString(double lat) const;

        std::string getLatString(int lat) const;

        std::string getLonString(double lat, double lon, int& DLonZone) const;

        std::string getLonString(int lon) const;

        std::string getUrefString(int uref) const;

        std::string getRrefString(int rref) const;

        void getRrefString(double lat, double lon, int cdb_lod, std::string& uref_string, std::string& rref_string) const;


    private:

        std::string     myCdbRootDir;

        CDBDatasets*    myCDBDatasets;

    };

} } } // namespace mak::osgEarth::CDB