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_2.*;
  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 initAndFinishMapAsync (final AltosSiteMapTile tile, final Point offset) {
 224                 Thread thread = new Thread() {
 225                                 public void run() {
 226                                         initMap(offset);
 227                                         finishTileLater(tile, offset);
 228                                 }
 229                         };
 230                 thread.start();
 231         }
 232
 233         public void setBaseLocation(double lat, double lng) {
 234                 for (Point k : mapTiles.keySet()) {
 235                         AltosSiteMapTile tile = mapTiles.get(k);
 236                         tile.clearMap();
 237                 }
 238
 239                 centre = getBaseLocation(lat, lng);
 240                 scrollRocketToVisible(pt(lat,lng));
 241         }
 242
 243         private void initMaps(double lat, double lng) {
 244                 setBaseLocation(lat, lng);
 245
 246                 Thread thread = new Thread() {
 247                                 public void run() {
 248                                         for (Point k : mapTiles.keySet())
 249                                                 initMap(k);
 250                                 }
 251                         };
 252                 thread.start();
 253         }
 254
 255         private static File MapFile(double lat, double lng, int zoom) {
 256                 char chlat = lat < 0 ? 'S' : 'N';
 257                 char chlng = lng < 0 ? 'W' : 'E';
 258                 if (lat < 0) lat = -lat;
 259                 if (lng < 0) lng = -lng;
 260                 return new File(AltosUIPreferences.mapdir(),
 261                                 String.format("map-%c%.6f,%c%.6f-%d.png",
 262                                               chlat, lat, chlng, lng, zoom));
 263         }
 264
 265         private static String MapURL(double lat, double lng, int zoom) {
 266                 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);
 267         }
 268
 269         boolean initialised = false;
 270         Point2D.Double last_pt = null;
 271         int last_state = -1;
 272
 273         public void show(double lat, double lon) {
 274                 System.out.printf ("show %g %g\n", lat, lon);
 275                 return;
 276 //              initMaps(lat, lon);
 277 //              scrollRocketToVisible(pt(lat, lon));
 278         }
 279         public void show(final AltosState state, final AltosListenerState listener_state) {
 280                 // if insufficient gps data, nothing to update
 281                 AltosGPS        gps = state.gps;
 282
 283                 if (gps == null)
 284                         return;
 285
 286                 if (!gps.locked && gps.nsat < 4)
 287                         return;
 288
 289                 if (!initialised) {
 290                         if (state.pad_lat != AltosLib.MISSING && state.pad_lon != AltosLib.MISSING) {
 291                                 initMaps(state.pad_lat, state.pad_lon);
 292                                 initialised = true;
 293                         } else if (gps.lat != AltosLib.MISSING && gps.lon != AltosLib.MISSING) {
 294                                 initMaps(gps.lat, gps.lon);
 295                                 initialised = true;
 296                         } else {
 297                                 return;
 298                         }
 299                 }
 300
 301                 final Point2D.Double pt = pt(gps.lat, gps.lon);
 302                 if (last_pt == pt && last_state == state.state)
 303                         return;
 304
 305                 if (last_pt == null) {
 306                         last_pt = pt;
 307                 }
 308                 boolean in_any = false;
 309                 for (Point offset : mapTiles.keySet()) {
 310                         AltosSiteMapTile tile = mapTiles.get(offset);
 311                         Point2D.Double ref, lref;
 312                         ref = translatePoint(pt, tileCoordOffset(offset));
 313                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 314                         tile.show(state, listener_state, lref, ref);
 315                         if (0 <= ref.x && ref.x < px_size)
 316                                 if (0 <= ref.y && ref.y < px_size)
 317                                         in_any = true;
 318                 }
 319
 320                 Point offset = tileOffset(pt);
 321                 if (!in_any) {
 322                         Point2D.Double ref, lref;
 323                         ref = translatePoint(pt, tileCoordOffset(offset));
 324                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 325
 326                         AltosSiteMapTile tile = createTile(offset);
 327                         tile.show(state, listener_state, lref, ref);
 328                         initAndFinishMapAsync(tile, offset);
 329                 }
 330
 331                 scrollRocketToVisible(pt);
 332
 333                 if (offset != tileOffset(last_pt)) {
 334                         ensureTilesAround(offset);
 335                 }
 336
 337                 last_pt = pt;
 338                 last_state = state.state;
 339         }
 340
 341         public void centre(Point2D.Double pt) {
 342                 Rectangle r = comp.getVisibleRect();
 343                 Point2D.Double copt = translatePoint(pt, tileCoordOffset(topleft));
 344                 int dx = (int)copt.x - r.width/2 - r.x;
 345                 int dy = (int)copt.y - r.height/2 - r.y;
 346                 r.x += dx;
 347                 r.y += dy;
 348                 comp.scrollRectToVisible(r);
 349         }
 350
 351         public void centre(AltosState state) {
 352                 if (!state.gps.locked && state.gps.nsat < 4)
 353                         return;
 354                 centre(pt(state.gps.lat, state.gps.lon));
 355         }
 356
 357         public void draw_circle(double lat, double lon) {
 358                 final Point2D.Double pt = pt(lat, lon);
 359
 360                 for (Point offset : mapTiles.keySet()) {
 361                         AltosSiteMapTile tile = mapTiles.get(offset);
 362                         Point2D.Double ref = translatePoint(pt, tileCoordOffset(offset));
 363                         tile.draw_circle(ref);
 364                 }
 365         }
 366
 367         private AltosSiteMapTile createTile(Point offset) {
 368                 AltosSiteMapTile tile = new AltosSiteMapTile(px_size);
 369                 mapTiles.put(offset, tile);
 370                 return tile;
 371         }
 372         private void finishTileLater(final AltosSiteMapTile tile,
 373                                      final Point offset)
 374         {
 375                 SwingUtilities.invokeLater( new Runnable() {
 376                         public void run() {
 377                                 addTileAt(tile, offset);
 378                         }
 379                 } );
 380         }
 381
 382         private void ensureTilesAround(Point base_offset) {
 383                 for (int x = -radius; x <= radius; x++) {
 384                         for (int y = -radius; y <= radius; y++) {
 385                                 Point offset = new Point(base_offset.x + x, base_offset.y + y);
 386                                 if (mapTiles.containsKey(offset))
 387                                         continue;
 388                                 AltosSiteMapTile tile = createTile(offset);
 389                                 initAndFinishMapAsync(tile, offset);
 390                         }
 391                 }
 392         }
 393
 394         private Point topleft = new Point(0,0);
 395         private void scrollRocketToVisible(Point2D.Double pt) {
 396                 Rectangle r = comp.getVisibleRect();
 397                 Point2D.Double copt = translatePoint(pt, tileCoordOffset(topleft));
 398                 int dx = (int)copt.x - r.width/2 - r.x;
 399                 int dy = (int)copt.y - r.height/2 - r.y;
 400                 if (Math.abs(dx) > r.width/4 || Math.abs(dy) > r.height/4) {
 401                         r.x += dx;
 402                         r.y += dy;
 403                         comp.scrollRectToVisible(r);
 404                 }
 405         }
 406
 407         private void addTileAt(AltosSiteMapTile tile, Point offset) {
 408                 if (Math.abs(offset.x) >= MAX_TILE_DELTA ||
 409                                 Math.abs(offset.y) >= MAX_TILE_DELTA)
 410                 {
 411                         System.out.printf("Rocket too far away from pad (tile %d,%d)\n",
 412                                           offset.x, offset.y);
 413                         return;
 414                 }
 415
 416                 boolean review = false;
 417                 Rectangle r = comp.getVisibleRect();
 418                 if (offset.x < topleft.x) {
 419                         r.x += (topleft.x - offset.x) * px_size;
 420                         topleft.x = offset.x;
 421                         review = true;
 422                 }
 423                 if (offset.y < topleft.y) {
 424                         r.y += (topleft.y - offset.y) * px_size;
 425                         topleft.y = offset.y;
 426                         review = true;
 427                 }
 428                 GridBagConstraints c = new GridBagConstraints();
 429                 c.anchor = GridBagConstraints.CENTER;
 430                 c.fill = GridBagConstraints.BOTH;
 431                 // put some space between the map tiles, debugging only
 432                 // c.insets = new Insets(5, 5, 5, 5);
 433
 434                 c.gridx = offset.x + MAX_TILE_DELTA;
 435                 c.gridy = offset.y + MAX_TILE_DELTA;
 436                 layout.setConstraints(tile, c);
 437
 438                 comp.add(tile);
 439                 if (review) {
 440                         comp.scrollRectToVisible(r);
 441                 }
 442         }
 443
 444         private AltosSiteMap(boolean knowWhatYouAreDoing) {
 445                 if (!knowWhatYouAreDoing) {
 446                         throw new RuntimeException("Arggh.");
 447                 }
 448         }
 449
 450         JComponent comp = new JComponent() { };
 451         private GridBagLayout layout = new GridBagLayout();
 452
 453         public AltosSiteMap(int in_radius) {
 454                 radius = in_radius;
 455
 456                 GrabNDrag scroller = new GrabNDrag(comp);
 457
 458                 comp.setLayout(layout);
 459
 460                 for (int x = -radius; x <= radius; x++) {
 461                         for (int y = -radius; y <= radius; y++) {
 462                                 Point offset = new Point(x, y);
 463                                 AltosSiteMapTile t = createTile(offset);
 464                                 addTileAt(t, offset);
 465                         }
 466                 }
 467                 setViewportView(comp);
 468                 setPreferredSize(new Dimension(500,500));
 469         }
 470
 471         public AltosSiteMap() {
 472                 this(1);
 473         }
 474 }