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