osgEarth 2.1.1

/home/cube/sources/osgearth/src/osgEarthDrivers/yahoo/ReaderWriterYahoo.cpp

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00001 /* -*-c++-*- */
00002 /* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
00003  * Copyright 2008-2010 Pelican Mapping
00004  * http://osgearth.org
00005  *
00006  * osgEarth is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program.  If not, see <http://www.gnu.org/licenses/>
00018  */
00019 
00020 #include <osgEarth/TileSource>
00021 #include <osgEarth/Registry>
00022 
00023 #include <osg/Notify>
00024 #include <osgDB/FileNameUtils>
00025 #include <osgDB/FileUtils>
00026 #include <osgDB/Registry>
00027 #include <osgDB/ReadFile>
00028 #include <osgDB/WriteFile>
00029 #include <sstream>
00030 
00031 #include "YahooOptions"
00032 
00033 using namespace osgEarth;
00034 using namespace osgEarth::Drivers;
00035 
00036 class YahooSource : public TileSource
00037 {
00038 public:
00039     YahooSource( const TileSourceOptions& options ) : TileSource( options ), _options(options)
00040     {
00041         //nop
00042     }
00043 
00044     // Yahoo! uses spherical mercator, but the top LOD is a 2x2 tile set.
00045     void initialize( const std::string& referenceURI, const Profile* overrideProfile)
00046     {
00047         setProfile( Profile::create( "spherical-mercator", "", 2, 2 ) );
00048     }
00049 
00050     osg::Image* createImage( const TileKey& key,
00051                              ProgressCallback* progress )
00052     {
00053         //Return NULL if we are given a non global-mercator key
00054         if ( !key.getProfile()->getProfileType() == Profile::TYPE_MERCATOR ) return 0;
00055 
00056         std::stringstream buf;
00057 
00058         std::string dataset = 
00059             _options.dataset().isSet() ? _options.dataset().value() : "roads";
00060         
00061         if ( dataset == "roads" || dataset == "map" )
00062         {            
00063             // http://us.maps1.yimg.com/us.tile.maps.yimg.com/tl?v=4.1&md=2&x=0&y=0&z=2&r=1
00064             unsigned int tile_x, tile_y;
00065             key.getTileXY( tile_x, tile_y );
00066             unsigned int zoom = key.getLevelOfDetail();
00067             unsigned int size_x, size_y;
00068             key.getProfile()->getNumTiles( zoom, size_x, size_y );
00069 
00070             buf << "http://us.maps1.yimg.com/us.tile.maps.yimg.com/tl"
00071                 << "?v=4.1&md=2&r=1"
00072                 << "&x=" << (int)tile_x
00073                 << "&y=" << ((int)size_y-1-(int)tile_y) - (int)size_y/2
00074                 << "&z=" << zoom + 2;
00075         }
00076         else if ( dataset == "aerial" || dataset == "satellite" )
00077         {
00078             unsigned int tile_x, tile_y;
00079             key.getTileXY( tile_x, tile_y );
00080             unsigned int zoom = key.getLevelOfDetail();
00081             unsigned int size_x, size_y;
00082             key.getProfile()->getNumTiles( zoom, size_x, size_y );
00083 
00084             buf << "http://us.maps3.yimg.com/aerial.maps.yimg.com/ximg"
00085                 << "?v=1.8&s=256&t=a&r=1"
00086                 << "&x=" << (int)tile_x
00087                 << "&y=" << ((int)size_y-1-(int)tile_y) - (int)size_y/2
00088                 << "&z=" << zoom + 2;
00089         }
00090 
00091                 std::string base;
00092                 base = buf.str();
00093 
00094         OE_DEBUG << key.str() << "=" << base << std::endl;
00095         
00096         osg::ref_ptr<osg::Image> image;
00097         HTTPClient::readImageFile( base, image, 0L, progress ); //getOptions(), progress );
00098         return image.release();
00099     }
00100 
00101     osg::HeightField* createHeightField( const TileKey& key,
00102                                          ProgressCallback* progress)
00103     {
00104         //NI
00105         OE_WARN << "[Yahoo] Driver does not support heightfields" << std::endl;
00106         return NULL;
00107     }
00108 
00109     virtual std::string getExtension()  const 
00110     {
00111         //All Yahoo tiles are in JPEG format
00112         return "jpg";
00113     }
00114 
00115     virtual bool supportsPersistentCaching() const
00116     {
00117         return false;
00118     }
00119 
00120 private:
00121     const YahooOptions _options;
00122 };
00123 
00124 
00125 class ReaderWriterYahoo : public TileSourceDriver
00126 {
00127     public:
00128         ReaderWriterYahoo()
00129         {
00130             supportsExtension( "osgearth_yahoo", "Yahoo maps data" );
00131         }
00132 
00133         virtual const char* className()
00134         {
00135             return "Yahoo Imagery ReaderWriter";
00136         }
00137 
00138         virtual ReadResult readObject(const std::string& file_name, const Options* options) const
00139         {
00140             if ( !acceptsExtension(osgDB::getLowerCaseFileExtension( file_name )))
00141                 return ReadResult::FILE_NOT_HANDLED;
00142 
00143             return new YahooSource( getTileSourceOptions(options) );
00144         }
00145 };
00146 
00147 REGISTER_OSGPLUGIN(osgearth_yahoo, ReaderWriterYahoo)
00148 
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