git.gag.com Git - fw/altos/blob - altosui/AltosSiteMap.java

   1 /*
   2  * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  16  */
  17
  18 package altosui;
  19
  20 import java.awt.*;
  21 import javax.swing.*;
  22 import java.io.*;
  23 import java.lang.Math;
  24 import java.awt.geom.Point2D;
  25 import java.util.concurrent.*;
  26 import org.altusmetrum.altoslib_1.*;
  27 import org.altusmetrum.altosuilib_1.*;
  28
  29 public class AltosSiteMap extends JScrollPane implements AltosFlightDisplay {
  30         // preferred vertical step in a tile in naut. miles
  31         // will actually choose a step size between x and 2x, where this
  32         // is 1.5x
  33         static final double tile_size_nmi = 0.75;
  34
  35         static final int px_size = 512;
  36
  37         static final int MAX_TILE_DELTA = 100;
  38
  39         private static Point2D.Double translatePoint(Point2D.Double p,
  40                         Point2D.Double d)
  41         {
  42                 return new Point2D.Double(p.x + d.x, p.y + d.y);
  43         }
  44
  45         static class LatLng {
  46                 public double lat, lng;
  47                 public LatLng(double lat, double lng) {
  48                         this.lat = lat;
  49                         this.lng = lng;
  50                 }
  51         }
  52
  53         // based on google js
  54         //  http://maps.gstatic.com/intl/en_us/mapfiles/api-3/2/10/main.js
  55         // search for fromLatLngToPoint and fromPointToLatLng
  56         /*
  57         private static Point2D.Double pt(LatLng latlng, int zoom) {
  58                 double scale_x = 256/360.0 * Math.pow(2, zoom);
  59                 double scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
  60                 return pt(latlng, scale_x, scale_y);
  61         }
  62         */
  63
  64         private static Point2D.Double pt(LatLng latlng,
  65                                          double scale_x, double scale_y)
  66         {
  67                 Point2D.Double res = new Point2D.Double();
  68                 double e;
  69
  70                 res.x = latlng.lng * scale_x;
  71
  72                 e = Math.sin(Math.toRadians(latlng.lat));
  73                 e = Math.max(e,-(1-1.0E-15));
  74                 e = Math.min(e,  1-1.0E-15 );
  75
  76                 res.y = 0.5*Math.log((1+e)/(1-e))*-scale_y;
  77                 return res;
  78         }
  79
  80         static private LatLng latlng(Point2D.Double pt,
  81                                      double scale_x, double scale_y)
  82         {
  83                 double lat, lng;
  84                 double rads;
  85
  86                 lng = pt.x/scale_x;
  87                 rads = 2 * Math.atan(Math.exp(-pt.y/scale_y));
  88                 lat = Math.toDegrees(rads - Math.PI/2);
  89
  90                 return new LatLng(lat,lng);
  91         }
  92
  93         int zoom;
  94         double scale_x, scale_y;
  95
  96         int radius;     /* half width/height of tiles to load */
  97
  98         private Point2D.Double pt(double lat, double lng) {
  99                 return pt(new LatLng(lat, lng), scale_x, scale_y);
 100         }
 101
 102         private LatLng latlng(double x, double y) {
 103                 return latlng(new Point2D.Double(x,y), scale_x, scale_y);
 104         }
 105         /*
 106         private LatLng latlng(Point2D.Double pt) {
 107                 return latlng(pt, scale_x, scale_y);
 108         }
 109         */
 110
 111         ConcurrentHashMap<Point,AltosSiteMapTile> mapTiles = new ConcurrentHashMap<Point,AltosSiteMapTile>();
 112         Point2D.Double centre;
 113
 114         private Point2D.Double tileCoordOffset(Point p) {
 115                 return new Point2D.Double(centre.x - p.x*px_size,
 116                                           centre.y - p.y * px_size);
 117         }
 118
 119         private Point tileOffset(Point2D.Double p) {
 120                 return new Point((int)Math.floor((centre.x+p.x)/px_size),
 121                                  (int)Math.floor((centre.y+p.y)/px_size));
 122         }
 123
 124         private Point2D.Double getBaseLocation(double lat, double lng) {
 125                 Point2D.Double locn, north_step;
 126
 127                 zoom = 2;
 128                 // stupid loop structure to please Java's control flow analysis
 129                 do {
 130                         zoom++;
 131                         scale_x = 256/360.0 * Math.pow(2, zoom);
 132                         scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
 133                         locn = pt(lat, lng);
 134                         north_step = pt(lat+tile_size_nmi*4/3/60.0, lng);
 135                         if (locn.y - north_step.y > px_size)
 136                                 break;
 137                 } while (zoom < 22);
 138                 locn.x = -px_size * Math.floor(locn.x/px_size);
 139                 locn.y = -px_size * Math.floor(locn.y/px_size);
 140                 return locn;
 141         }
 142
 143         public void reset() {
 144                 // nothing
 145         }
 146
 147         public void set_font() {
 148                 // nothing
 149         }
 150
 151         private void loadMap(final AltosSiteMapTile tile,
 152                              File pngfile, String pngurl)
 153         {
 154                 final ImageIcon res = AltosSiteMapCache.fetchAndLoadMap(pngfile, pngurl);
 155                 if (res != null) {
 156                         SwingUtilities.invokeLater(new Runnable() {
 157                                         public void run() {
 158                                                 tile.loadMap(res);
 159                                         }
 160                                 });
 161                 } else {
 162                         System.out.printf("# Failed to fetch file %s\n", pngfile);
 163                         System.out.printf(" wget -O '%s' '%s'\n", pngfile, pngurl);
 164                 }
 165         }
 166
 167         File pngfile;
 168         String pngurl;
 169
 170         public int prefetchMap(int x, int y) {
 171                 LatLng map_latlng = latlng(
 172                         -centre.x + x*px_size + px_size/2,
 173                         -centre.y + y*px_size + px_size/2);
 174                 pngfile = MapFile(map_latlng.lat, map_latlng.lng, zoom);
 175                 pngurl = MapURL(map_latlng.lat, map_latlng.lng, zoom);
 176                 if (pngfile.exists()) {
 177                         return 1;
 178                 } else if (AltosSiteMapCache.fetchMap(pngfile, pngurl)) {
 179                         return 0;
 180                 } else {
 181                         return -1;
 182                 }
 183         }
 184
 185         public static void prefetchMaps(double lat, double lng, int w, int h) {
 186                 AltosSiteMap asm = new AltosSiteMap(true);
 187                 asm.centre = asm.getBaseLocation(lat, lng);
 188
 189                 //Point2D.Double p = new Point2D.Double();
 190                 //Point2D.Double p2;
 191                 int dx = -w/2, dy = -h/2;
 192                 for (int y = dy; y < h+dy; y++) {
 193                         for (int x = dx; x < w+dx; x++) {
 194                                 int r = asm.prefetchMap(x, y);
 195                                 switch (r) {
 196                                 case 1:
 197                                         System.out.printf("Already have %s\n", asm.pngfile);
 198                                         break;
 199                                 case 0:
 200                                         System.out.printf("Fetched map %s\n", asm.pngfile);
 201                                         break;
 202                                 case -1:
 203                                         System.out.printf("# Failed to fetch file %s\n", asm.pngfile);
 204                                         System.out.printf(" wget -O '%s' ''\n", asm.pngfile, asm.pngurl);
 205                                         break;
 206                                 }
 207                         }
 208                 }
 209         }
 210
 211         public String initMap(Point offset) {
 212                 AltosSiteMapTile tile = mapTiles.get(offset);
 213                 Point2D.Double coord = tileCoordOffset(offset);
 214
 215                 LatLng map_latlng = latlng(px_size/2-coord.x, px_size/2-coord.y);
 216
 217                 File pngfile = MapFile(map_latlng.lat, map_latlng.lng, zoom);
 218                 String pngurl = MapURL(map_latlng.lat, map_latlng.lng, zoom);
 219                 loadMap(tile, pngfile, pngurl);
 220                 return pngfile.toString();
 221         }
 222
 223         public void setBaseLocation(double lat, double lng) {
 224                 for (Point k : mapTiles.keySet()) {
 225                         AltosSiteMapTile tile = mapTiles.get(k);
 226                         tile.clearMap();
 227                 }
 228
 229                 centre = getBaseLocation(lat, lng);
 230                 scrollRocketToVisible(pt(lat,lng));
 231         }
 232
 233         private void initMaps(double lat, double lng) {
 234                 setBaseLocation(lat, lng);
 235
 236                 Thread thread = new Thread() {
 237                                 public void run() {
 238                                         for (Point k : mapTiles.keySet())
 239                                                 initMap(k);
 240                                 }
 241                         };
 242                 thread.start();
 243         }
 244
 245         private static File MapFile(double lat, double lng, int zoom) {
 246                 char chlat = lat < 0 ? 'S' : 'N';
 247                 char chlng = lng < 0 ? 'W' : 'E';
 248                 if (lat < 0) lat = -lat;
 249                 if (lng < 0) lng = -lng;
 250                 return new File(AltosUIPreferences.mapdir(),
 251                                 String.format("map-%c%.6f,%c%.6f-%d.png",
 252                                               chlat, lat, chlng, lng, zoom));
 253         }
 254
 255         private static String MapURL(double lat, double lng, int zoom) {
 256                 return String.format("http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&sensor=false&maptype=hybrid&format=png32", lat, lng, zoom, px_size, px_size);
 257         }
 258
 259         boolean initialised = false;
 260         Point2D.Double last_pt = null;
 261         int last_state = -1;
 262
 263         public void show(double lat, double lon) {
 264                 initMaps(lat, lon);
 265                 scrollRocketToVisible(pt(lat, lon));
 266         }
 267         public void show(final AltosState state, final int crc_errors) {
 268                 // if insufficient gps data, nothing to update
 269                 if (!state.gps.locked && state.gps.nsat < 4)
 270                         return;
 271
 272                 if (!initialised) {
 273                         if (state.pad_lat != 0 || state.pad_lon != 0) {
 274                                 initMaps(state.pad_lat, state.pad_lon);
 275                                 initialised = true;
 276                         } else if (state.gps.lat != 0 || state.gps.lon != 0) {
 277                                 initMaps(state.gps.lat, state.gps.lon);
 278                                 initialised = true;
 279                         } else {
 280                                 return;
 281                         }
 282                 }
 283
 284                 final Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
 285                 if (last_pt == pt && last_state == state.state)
 286                         return;
 287
 288                 if (last_pt == null) {
 289                         last_pt = pt;
 290                 }
 291                 boolean in_any = false;
 292                 for (Point offset : mapTiles.keySet()) {
 293                         AltosSiteMapTile tile = mapTiles.get(offset);
 294                         Point2D.Double ref, lref;
 295                         ref = translatePoint(pt, tileCoordOffset(offset));
 296                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 297                         tile.show(state, crc_errors, lref, ref);
 298                         if (0 <= ref.x && ref.x < px_size)
 299                                 if (0 <= ref.y && ref.y < px_size)
 300                                         in_any = true;
 301                 }
 302
 303                 Point offset = tileOffset(pt);
 304                 if (!in_any) {
 305                         Point2D.Double ref, lref;
 306                         ref = translatePoint(pt, tileCoordOffset(offset));
 307                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 308
 309                         AltosSiteMapTile tile = createTile(offset);
 310                         tile.show(state, crc_errors, lref, ref);
 311                         initMap(offset);
 312                         finishTileLater(tile, offset);
 313                 }
 314
 315                 scrollRocketToVisible(pt);
 316
 317                 if (offset != tileOffset(last_pt)) {
 318                         ensureTilesAround(offset);
 319                 }
 320
 321                 last_pt = pt;
 322                 last_state = state.state;
 323         }
 324
 325         public void centre(Point2D.Double pt) {
 326                 Rectangle r = comp.getVisibleRect();
 327                 Point2D.Double copt = translatePoint(pt, tileCoordOffset(topleft));
 328                 int dx = (int)copt.x - r.width/2 - r.x;
 329                 int dy = (int)copt.y - r.height/2 - r.y;
 330                 r.x += dx;
 331                 r.y += dy;
 332                 comp.scrollRectToVisible(r);
 333         }
 334
 335         public void centre(AltosState state) {
 336                 if (!state.gps.locked && state.gps.nsat < 4)
 337                         return;
 338                 centre(pt(state.gps.lat, state.gps.lon));
 339         }
 340
 341         public void draw_circle(double lat, double lon) {
 342                 final Point2D.Double pt = pt(lat, lon);
 343
 344                 for (Point offset : mapTiles.keySet()) {
 345                         AltosSiteMapTile tile = mapTiles.get(offset);
 346                         Point2D.Double ref = translatePoint(pt, tileCoordOffset(offset));
 347                         tile.draw_circle(ref);
 348                 }
 349         }
 350
 351         private AltosSiteMapTile createTile(Point offset) {
 352                 AltosSiteMapTile tile = new AltosSiteMapTile(px_size);
 353                 mapTiles.put(offset, tile);
 354                 return tile;
 355         }
 356         private void finishTileLater(final AltosSiteMapTile tile,
 357                                      final Point offset)
 358         {
 359                 SwingUtilities.invokeLater( new Runnable() {
 360                         public void run() {
 361                                 addTileAt(tile, offset);
 362                         }
 363                 } );
 364         }
 365
 366         private void ensureTilesAround(Point base_offset) {
 367                 for (int x = -radius; x <= radius; x++) {
 368                         for (int y = -radius; y <= radius; y++) {
 369                                 Point offset = new Point(base_offset.x + x, base_offset.y + y);
 370                                 if (mapTiles.containsKey(offset))
 371                                         continue;
 372                                 AltosSiteMapTile tile = createTile(offset);
 373                                 initMap(offset);
 374                                 finishTileLater(tile, offset);
 375                         }
 376                 }
 377         }
 378
 379         private Point topleft = new Point(0,0);
 380         private void scrollRocketToVisible(Point2D.Double pt) {
 381                 Rectangle r = comp.getVisibleRect();
 382                 Point2D.Double copt = translatePoint(pt, tileCoordOffset(topleft));
 383                 int dx = (int)copt.x - r.width/2 - r.x;
 384                 int dy = (int)copt.y - r.height/2 - r.y;
 385                 if (Math.abs(dx) > r.width/4 || Math.abs(dy) > r.height/4) {
 386                         r.x += dx;
 387                         r.y += dy;
 388                         comp.scrollRectToVisible(r);
 389                 }
 390         }
 391
 392         private void addTileAt(AltosSiteMapTile tile, Point offset) {
 393                 if (Math.abs(offset.x) >= MAX_TILE_DELTA ||
 394                                 Math.abs(offset.y) >= MAX_TILE_DELTA)
 395                 {
 396                         System.out.printf("Rocket too far away from pad (tile %d,%d)\n",
 397                                           offset.x, offset.y);
 398                         return;
 399                 }
 400
 401                 boolean review = false;
 402                 Rectangle r = comp.getVisibleRect();
 403                 if (offset.x < topleft.x) {
 404                         r.x += (topleft.x - offset.x) * px_size;
 405                         topleft.x = offset.x;
 406                         review = true;
 407                 }
 408                 if (offset.y < topleft.y) {
 409                         r.y += (topleft.y - offset.y) * px_size;
 410                         topleft.y = offset.y;
 411                         review = true;
 412                 }
 413                 GridBagConstraints c = new GridBagConstraints();
 414                 c.anchor = GridBagConstraints.CENTER;
 415                 c.fill = GridBagConstraints.BOTH;
 416                 // put some space between the map tiles, debugging only
 417                 // c.insets = new Insets(5, 5, 5, 5);
 418
 419                 c.gridx = offset.x + MAX_TILE_DELTA;
 420                 c.gridy = offset.y + MAX_TILE_DELTA;
 421                 layout.setConstraints(tile, c);
 422
 423                 comp.add(tile);
 424                 if (review) {
 425                         comp.scrollRectToVisible(r);
 426                 }
 427         }
 428
 429         private AltosSiteMap(boolean knowWhatYouAreDoing) {
 430                 if (!knowWhatYouAreDoing) {
 431                         throw new RuntimeException("Arggh.");
 432                 }
 433         }
 434
 435         JComponent comp = new JComponent() { };
 436         private GridBagLayout layout = new GridBagLayout();
 437
 438         public AltosSiteMap(int in_radius) {
 439                 radius = in_radius;
 440
 441                 GrabNDrag scroller = new GrabNDrag(comp);
 442
 443                 comp.setLayout(layout);
 444
 445                 for (int x = -radius; x <= radius; x++) {
 446                         for (int y = -radius; y <= radius; y++) {
 447                                 Point offset = new Point(x, y);
 448                                 AltosSiteMapTile t = createTile(offset);
 449                                 addTileAt(t, offset);
 450                         }
 451                 }
 452                 setViewportView(comp);
 453                 setPreferredSize(new Dimension(500,500));
 454         }
 455
 456         public AltosSiteMap() {
 457                 this(1);
 458         }
 459 }