001// License: BSD or GPL. For details, see Readme.txt file. 002// Authors of this file, namely Gleb Smirnoff and Andrey Boltenkov, allow 003// to reuse the code under BSD license. 004package org.openstreetmap.gui.jmapviewer.tilesources; 005 006import java.awt.Point; 007import java.util.Random; 008 009import org.openstreetmap.gui.jmapviewer.Coordinate; 010import org.openstreetmap.gui.jmapviewer.OsmMercator; 011import org.openstreetmap.gui.jmapviewer.TileXY; 012import org.openstreetmap.gui.jmapviewer.interfaces.ICoordinate; 013 014/** 015 * This tilesource uses different to OsmMercator projection. 016 * 017 * Earth is assumed an ellipsoid in this projection, unlike 018 * sphere in OsmMercator, so latitude calculation differs a lot. 019 * 020 * The longitude calculation is the same as in OsmMercator, 021 * we inherit it from AbstractTMSTileSource. 022 * 023 * TODO: correct getDistance() method. 024 */ 025public class ScanexTileSource extends TMSTileSource { 026 private static final String DEFAULT_URL = "http://maps.kosmosnimki.ru"; 027 private static final int DEFAULT_MAXZOOM = 14; 028 private static final String API_KEY = "4018C5A9AECAD8868ED5DEB2E41D09F7"; 029 030 private enum ScanexLayer { 031 IRS("irs", "/TileSender.ashx?ModeKey=tile&MapName=F7B8CF651682420FA1749D894C8AD0F6&LayerName=BAC78D764F0443BD9AF93E7A998C9F5B"); 032 033 private final String name; 034 private final String uri; 035 036 ScanexLayer(String name, String uri) { 037 this.name = name; 038 this.uri = uri; 039 } 040 041 public String getName() { 042 return name; 043 } 044 045 public String getUri() { 046 return uri; 047 } 048 } 049 050 /** IRS by default */ 051 private ScanexLayer layer = ScanexLayer.IRS; 052 private TemplatedTMSTileSource TemplateSource = null; 053 054 /** cached latitude used in {@link #tileYToLat(double, int)} */ 055 private double cachedLat; 056 057 /** 058 * Constructs a new {@code ScanexTileSource}. 059 * @param info tile source info 060 */ 061 public ScanexTileSource(TileSourceInfo info) { 062 super(info); 063 String url = info.getUrl(); 064 065 /** 066 * The formulae in tileYToLat() and latToTileY() have 2^8 067 * hardcoded in them, so explicitly state that. For now 068 * the assignment matches OsmMercator.DEFAUL_TILE_SIZE, and 069 * thus is extraneous. But let it be there just in case if 070 * OsmMercator changes. 071 */ 072 this.tileSize = 256; 073 074 for (ScanexLayer slayer : ScanexLayer.values()) { 075 if (url.equalsIgnoreCase(slayer.getName())) { 076 this.layer = slayer; 077 // Override baseUrl and maxZoom in base class. 078 this.baseUrl = DEFAULT_URL; 079 if (maxZoom == 0) 080 this.maxZoom = DEFAULT_MAXZOOM; 081 return; 082 } 083 } 084 /** If not "irs" or "spot" keyword, then a custom URL. */ 085 TemplatedTMSTileSource.checkUrl(info.getUrl()); 086 this.TemplateSource = new TemplatedTMSTileSource(info); 087 } 088 089 @Override 090 public String getExtension() { 091 return "jpeg"; 092 } 093 094 @Override 095 public String getTileUrl(int zoom, int tilex, int tiley) { 096 if (this.TemplateSource != null) 097 return this.TemplateSource.getTileUrl(zoom, tilex, tiley); 098 else 099 return this.getBaseUrl() + getTilePath(zoom, tilex, tiley); 100 } 101 102 @Override 103 public String getTilePath(int zoom, int tilex, int tiley) { 104 int tmp = (int) Math.pow(2.0, zoom - 1); 105 106 tilex = tilex - tmp; 107 tiley = tmp - tiley - 1; 108 109 return this.layer.getUri() + "&apikey=" + API_KEY + "&x=" + tilex + "&y=" + tiley + "&z=" + zoom; 110 } 111 112 // Latitude to Y and back calculations. 113 private static final double RADIUS_E = 6378137; /* radius of Earth at equator, m */ 114 private static final double EQUATOR = 40075016.68557849; /* equator length, m */ 115 private static final double E = 0.0818191908426; /* eccentricity of Earth's ellipsoid */ 116 117 @Override 118 public Point latLonToXY(double lat, double lon, int zoom) { 119 return new Point( 120 (int) Math.round(osmMercator.lonToX(lon, zoom)), 121 (int) Math.round(latToTileY(lat, zoom)) 122 ); 123 } 124 125 @Override 126 public ICoordinate xyToLatLon(int x, int y, int zoom) { 127 return new Coordinate( 128 tileYToLat(y, zoom), 129 osmMercator.xToLon(x, zoom) 130 ); 131 } 132 133 @Override 134 public TileXY latLonToTileXY(double lat, double lon, int zoom) { 135 return new TileXY( 136 osmMercator.lonToX(lon, zoom) / getTileSize(), 137 latToTileY(lat, zoom) 138 ); 139 } 140 141 @Override 142 public ICoordinate tileXYToLatLon(int x, int y, int zoom) { 143 return new Coordinate( 144 tileYToLat(y, zoom), 145 osmMercator.xToLon(x * getTileSize(), zoom) 146 ); 147 } 148 149 private double latToTileY(double lat, int zoom) { 150 double tmp = Math.tan(Math.PI/4 * (1 + lat/90)); 151 double pow = Math.pow(Math.tan(Math.PI/4 + Math.asin(E * Math.sin(Math.toRadians(lat)))/2), E); 152 153 return (EQUATOR/2 - (RADIUS_E * Math.log(tmp/pow))) * Math.pow(2.0, zoom) / EQUATOR; 154 } 155 156 /* 157 * To solve inverse formula latitude = f(y) we use 158 * Newton's method. We cache previous calculated latitude, 159 * because new one is usually close to the old one. In case 160 * if solution gets out of bounds, we reset to a new random value. 161 */ 162 private double tileYToLat(double y, int zoom) { 163 double lat0; 164 double lat = cachedLat; 165 do { 166 lat0 = lat; 167 lat = lat - Math.toDegrees(nextTerm(Math.toRadians(lat), y, zoom)); 168 if (lat > OsmMercator.MAX_LAT || lat < OsmMercator.MIN_LAT) { 169 Random r = new Random(); 170 lat = OsmMercator.MIN_LAT + 171 r.nextInt((int) (OsmMercator.MAX_LAT - OsmMercator.MIN_LAT)); 172 } 173 } while (Math.abs(lat0 - lat) > 0.000001); 174 175 cachedLat = lat; 176 177 return lat; 178 } 179 180 /* Next term in Newton's polynomial */ 181 private static double nextTerm(double lat, double y, int zoom) { 182 double sinl = Math.sin(lat); 183 double cosl = Math.cos(lat); 184 185 zoom = (int) Math.pow(2.0, zoom - 1); 186 double ec = Math.exp((1 - y/zoom)*Math.PI); 187 188 double f = Math.tan(Math.PI/4+lat/2) - 189 ec * Math.pow(Math.tan(Math.PI/4 + Math.asin(E * sinl)/2), E); 190 double df = 1/(1 - sinl) - ec * E * cosl/((1 - E * sinl) * 191 Math.sqrt(1 - E * E * sinl * sinl)); 192 193 return f/df; 194 } 195}