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 java.awt.image.*;
  22 import java.awt.event.*;
  23 import javax.swing.*;
  24 import javax.swing.event.MouseInputAdapter;
  25 import javax.imageio.ImageIO;
  26 import javax.swing.table.*;
  27 import java.io.*;
  28 import java.util.*;
  29 import java.text.*;
  30 import java.util.prefs.*;
  31 import java.lang.Math;
  32 import java.awt.geom.Point2D;
  33 import java.awt.geom.Line2D;
  34
  35 public class AltosSiteMap extends JScrollPane implements AltosFlightDisplay {
  36         // preferred vertical step in a tile in naut. miles
  37         // will actually choose a step size between x and 2x, where this
  38         // is 1.5x
  39         static final double tile_size_nmi = 0.75;
  40
  41         static final int px_size = 512;
  42
  43         static final int MAX_TILE_DELTA = 100;
  44
  45         private static Point2D.Double translatePoint(Point2D.Double p,
  46                         Point2D.Double d)
  47         {
  48                 return new Point2D.Double(p.x + d.x, p.y + d.y);
  49         }
  50
  51         static class LatLng {
  52                 public double lat, lng;
  53                 public LatLng(double lat, double lng) {
  54                         this.lat = lat;
  55                         this.lng = lng;
  56                 }
  57         }
  58
  59         // based on google js
  60         //  http://maps.gstatic.com/intl/en_us/mapfiles/api-3/2/10/main.js
  61         // search for fromLatLngToPoint and fromPointToLatLng
  62         private static Point2D.Double pt(LatLng latlng, int zoom) {
  63                 double scale_x = 256/360.0 * Math.pow(2, zoom);
  64                 double scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
  65                 return pt(latlng, scale_x, scale_y);
  66         }
  67
  68         private static Point2D.Double pt(LatLng latlng,
  69                                          double scale_x, double scale_y)
  70         {
  71                 Point2D.Double res = new Point2D.Double();
  72                 double e;
  73
  74                 res.x = latlng.lng * scale_x;
  75
  76                 e = Math.sin(Math.toRadians(latlng.lat));
  77                 e = Math.max(e,-(1-1.0E-15));
  78                 e = Math.min(e,  1-1.0E-15 );
  79
  80                 res.y = 0.5*Math.log((1+e)/(1-e))*-scale_y;
  81                 return res;
  82         }
  83
  84         static private LatLng latlng(Point2D.Double pt,
  85                                      double scale_x, double scale_y)
  86         {
  87                 double lat, lng;
  88                 double rads;
  89
  90                 lng = pt.x/scale_x;
  91                 rads = 2 * Math.atan(Math.exp(-pt.y/scale_y));
  92                 lat = Math.toDegrees(rads - Math.PI/2);
  93
  94                 return new LatLng(lat,lng);
  95         }
  96
  97         int zoom;
  98         double scale_x, scale_y;
  99
 100         int radius;     /* half width/height of tiles to load */
 101
 102         private Point2D.Double pt(double lat, double lng) {
 103                 return pt(new LatLng(lat, lng), scale_x, scale_y);
 104         }
 105
 106         private LatLng latlng(double x, double y) {
 107                 return latlng(new Point2D.Double(x,y), scale_x, scale_y);
 108         }
 109         private LatLng latlng(Point2D.Double pt) {
 110                 return latlng(pt, scale_x, scale_y);
 111         }
 112
 113         HashMap<Point,AltosSiteMapTile> mapTiles = new HashMap<Point,AltosSiteMapTile>();
 114         Point2D.Double centre;
 115
 116         private Point2D.Double tileCoordOffset(Point p) {
 117                 return new Point2D.Double(centre.x - p.x*px_size,
 118                                           centre.y - p.y * px_size);
 119         }
 120
 121         private Point tileOffset(Point2D.Double p) {
 122                 return new Point((int)Math.floor((centre.x+p.x)/px_size),
 123                                  (int)Math.floor((centre.y+p.y)/px_size));
 124         }
 125
 126         private Point2D.Double getBaseLocation(double lat, double lng) {
 127                 Point2D.Double locn, north_step;
 128
 129                 zoom = 2;
 130                 // stupid loop structure to please Java's control flow analysis
 131                 do {
 132                         zoom++;
 133                         scale_x = 256/360.0 * Math.pow(2, zoom);
 134                         scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
 135                         locn = pt(lat, lng);
 136                         north_step = pt(lat+tile_size_nmi*4/3/60.0, lng);
 137                         if (locn.y - north_step.y > px_size)
 138                                 break;
 139                 } while (zoom < 22);
 140                 locn.x = -px_size * Math.floor(locn.x/px_size);
 141                 locn.y = -px_size * Math.floor(locn.y/px_size);
 142                 return locn;
 143         }
 144
 145         public void reset() {
 146                 // nothing
 147         }
 148
 149         private void loadMap(final AltosSiteMapTile tile,
 150                              File pngfile, String pngurl)
 151         {
 152                 final ImageIcon res = AltosSiteMapCache.fetchAndLoadMap(pngfile, pngurl);
 153                 if (res != null) {
 154                         SwingUtilities.invokeLater(new Runnable() {
 155                                         public void run() {
 156                                                 tile.loadMap(res);
 157                                         }
 158                                 });
 159                 } else {
 160                         System.out.printf("# Failed to fetch file %s\n", pngfile);
 161                         System.out.printf(" wget -O '%s' '%s'\n", pngfile, pngurl);
 162                 }
 163         }
 164
 165         File pngfile;
 166         String pngurl;
 167
 168         public int prefetchMap(int x, int y) {
 169                 LatLng map_latlng = latlng(
 170                         -centre.x + x*px_size + px_size/2,
 171                         -centre.y + y*px_size + px_size/2);
 172                 pngfile = MapFile(map_latlng.lat, map_latlng.lng, zoom);
 173                 pngurl = MapURL(map_latlng.lat, map_latlng.lng, zoom);
 174                 if (pngfile.exists()) {
 175                         return 1;
 176                 } else if (AltosSiteMapCache.fetchMap(pngfile, pngurl)) {
 177                         return 0;
 178                 } else {
 179                         return -1;
 180                 }
 181         }
 182
 183         public static void prefetchMaps(double lat, double lng, int w, int h) {
 184                 AltosSiteMap asm = new AltosSiteMap(true);
 185                 asm.centre = asm.getBaseLocation(lat, lng);
 186
 187                 Point2D.Double p = new Point2D.Double();
 188                 Point2D.Double p2;
 189                 int dx = -w/2, dy = -h/2;
 190                 for (int y = dy; y < h+dy; y++) {
 191                         for (int x = dx; x < w+dx; x++) {
 192                                 int r = asm.prefetchMap(x, y);
 193                                 switch (r) {
 194                                 case 1:
 195                                         System.out.printf("Already have %s\n", asm.pngfile);
 196                                         break;
 197                                 case 0:
 198                                         System.out.printf("Fetched map %s\n", asm.pngfile);
 199                                         break;
 200                                 case -1:
 201                                         System.out.printf("# Failed to fetch file %s\n", asm.pngfile);
 202                                         System.out.printf(" wget -O '%s' ''\n", asm.pngfile, asm.pngurl);
 203                                         break;
 204                                 }
 205                         }
 206                 }
 207         }
 208
 209         public String initMap(Point offset) {
 210                 AltosSiteMapTile tile = mapTiles.get(offset);
 211                 Point2D.Double coord = tileCoordOffset(offset);
 212
 213                 LatLng map_latlng = latlng(px_size/2-coord.x, px_size/2-coord.y);
 214
 215                 File pngfile = MapFile(map_latlng.lat, map_latlng.lng, zoom);
 216                 String pngurl = MapURL(map_latlng.lat, map_latlng.lng, zoom);
 217                 loadMap(tile, pngfile, pngurl);
 218                 return pngfile.toString();
 219         }
 220
 221         public void setBaseLocation(double lat, double lng) {
 222                 for (Point k : mapTiles.keySet()) {
 223                         AltosSiteMapTile tile = mapTiles.get(k);
 224                         tile.clearMap();
 225                 }
 226
 227                 centre = getBaseLocation(lat, lng);
 228                 scrollRocketToVisible(pt(lat,lng));
 229         }
 230
 231         private void initMaps(double lat, double lng) {
 232                 setBaseLocation(lat, lng);
 233
 234                 Thread thread = new Thread() {
 235                                 public void run() {
 236                                         for (Point k : mapTiles.keySet())
 237                                                 initMap(k);
 238                                 }
 239                         };
 240                 thread.start();
 241         }
 242
 243         private static File MapFile(double lat, double lng, int zoom) {
 244                 char chlat = lat < 0 ? 'S' : 'N';
 245                 char chlng = lng < 0 ? 'W' : 'E';
 246                 if (lat < 0) lat = -lat;
 247                 if (lng < 0) lng = -lng;
 248                 return new File(AltosPreferences.mapdir(),
 249                                 String.format("map-%c%.6f,%c%.6f-%d.png",
 250                                               chlat, lat, chlng, lng, zoom));
 251         }
 252
 253         private static String MapURL(double lat, double lng, int zoom) {
 254                 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);
 255         }
 256
 257         boolean initialised = false;
 258         Point2D.Double last_pt = null;
 259         int last_state = -1;
 260
 261         public void show(double lat, double lon) {
 262                 initMaps(lat, lon);
 263                 scrollRocketToVisible(pt(lat, lon));
 264         }
 265         public void show(final AltosState state, final int crc_errors) {
 266                 // if insufficient gps data, nothing to update
 267                 if (!state.gps.locked && state.gps.nsat < 4)
 268                         return;
 269
 270                 if (!initialised) {
 271                         if (state.pad_lat != 0 || state.pad_lon != 0) {
 272                                 initMaps(state.pad_lat, state.pad_lon);
 273                                 initialised = true;
 274                         } else if (state.gps.lat != 0 || state.gps.lon != 0) {
 275                                 initMaps(state.gps.lat, state.gps.lon);
 276                                 initialised = true;
 277                         } else {
 278                                 return;
 279                         }
 280                 }
 281
 282                 final Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
 283                 if (last_pt == pt && last_state == state.state)
 284                         return;
 285
 286                 if (last_pt == null) {
 287                         last_pt = pt;
 288                 }
 289                 boolean in_any = false;
 290                 for (Point offset : mapTiles.keySet()) {
 291                         AltosSiteMapTile tile = mapTiles.get(offset);
 292                         Point2D.Double ref, lref;
 293                         ref = translatePoint(pt, tileCoordOffset(offset));
 294                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 295                         tile.show(state, crc_errors, lref, ref);
 296                         if (0 <= ref.x && ref.x < px_size)
 297                                 if (0 <= ref.y && ref.y < px_size)
 298                                         in_any = true;
 299                 }
 300
 301                 Point offset = tileOffset(pt);
 302                 if (!in_any) {
 303                         Point2D.Double ref, lref;
 304                         ref = translatePoint(pt, tileCoordOffset(offset));
 305                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 306
 307                         AltosSiteMapTile tile = createTile(offset);
 308                         tile.show(state, crc_errors, lref, ref);
 309                         initMap(offset);
 310                         finishTileLater(tile, offset);
 311                 }
 312
 313                 scrollRocketToVisible(pt);
 314
 315                 if (offset != tileOffset(last_pt)) {
 316                         ensureTilesAround(offset);
 317                 }
 318
 319                 last_pt = pt;
 320                 last_state = state.state;
 321         }
 322
 323         private AltosSiteMapTile createTile(Point offset) {
 324                 AltosSiteMapTile tile = new AltosSiteMapTile(px_size);
 325                 mapTiles.put(offset, tile);
 326                 return tile;
 327         }
 328         private void finishTileLater(final AltosSiteMapTile tile,
 329                                      final Point offset)
 330         {
 331                 SwingUtilities.invokeLater( new Runnable() {
 332                         public void run() {
 333                                 addTileAt(tile, offset);
 334                         }
 335                 } );
 336         }
 337
 338         private void ensureTilesAround(Point base_offset) {
 339                 for (int x = -radius; x <= radius; x++) {
 340                         for (int y = -radius; y <= radius; y++) {
 341                                 Point offset = new Point(base_offset.x + x, base_offset.y + y);
 342                                 if (mapTiles.containsKey(offset))
 343                                         continue;
 344                                 AltosSiteMapTile tile = createTile(offset);
 345                                 initMap(offset);
 346                                 finishTileLater(tile, offset);
 347                         }
 348                 }
 349         }
 350
 351         private Point topleft = new Point(0,0);
 352         private void scrollRocketToVisible(Point2D.Double pt) {
 353                 Rectangle r = comp.getVisibleRect();
 354                 Point2D.Double copt = translatePoint(pt, tileCoordOffset(topleft));
 355                 int dx = (int)copt.x - r.width/2 - r.x;
 356                 int dy = (int)copt.y - r.height/2 - r.y;
 357                 if (Math.abs(dx) > r.width/4 || Math.abs(dy) > r.height/4) {
 358                         r.x += dx;
 359                         r.y += dy;
 360                         comp.scrollRectToVisible(r);
 361                 }
 362         }
 363
 364         private void addTileAt(AltosSiteMapTile tile, Point offset) {
 365                 if (Math.abs(offset.x) >= MAX_TILE_DELTA ||
 366                                 Math.abs(offset.y) >= MAX_TILE_DELTA)
 367                 {
 368                         System.out.printf("Rocket too far away from pad (tile %d,%d)\n",
 369                                           offset.x, offset.y);
 370                         return;
 371                 }
 372
 373                 boolean review = false;
 374                 Rectangle r = comp.getVisibleRect();
 375                 if (offset.x < topleft.x) {
 376                         r.x += (topleft.x - offset.x) * px_size;
 377                         topleft.x = offset.x;
 378                         review = true;
 379                 }
 380                 if (offset.y < topleft.y) {
 381                         r.y += (topleft.y - offset.y) * px_size;
 382                         topleft.y = offset.y;
 383                         review = true;
 384                 }
 385                 GridBagConstraints c = new GridBagConstraints();
 386                 c.anchor = GridBagConstraints.CENTER;
 387                 c.fill = GridBagConstraints.BOTH;
 388                 // put some space between the map tiles, debugging only
 389                 // c.insets = new Insets(5, 5, 5, 5);
 390
 391                 c.gridx = offset.x + MAX_TILE_DELTA;
 392                 c.gridy = offset.y + MAX_TILE_DELTA;
 393                 layout.setConstraints(tile, c);
 394
 395                 comp.add(tile);
 396                 if (review) {
 397                         comp.scrollRectToVisible(r);
 398                 }
 399         }
 400
 401         private AltosSiteMap(boolean knowWhatYouAreDoing) {
 402                 if (!knowWhatYouAreDoing) {
 403                         throw new RuntimeException("Arggh.");
 404                 }
 405         }
 406
 407         JComponent comp = new JComponent() { };
 408         private GridBagLayout layout = new GridBagLayout();
 409
 410         public AltosSiteMap(int in_radius) {
 411                 radius = in_radius;
 412
 413                 GrabNDrag scroller = new GrabNDrag(comp);
 414
 415                 comp.setLayout(layout);
 416
 417                 for (int x = -radius; x <= radius; x++) {
 418                         for (int y = -radius; y <= radius; y++) {
 419                                 Point offset = new Point(x, y);
 420                                 AltosSiteMapTile t = createTile(offset);
 421                                 addTileAt(t, offset);
 422                         }
 423                 }
 424                 setViewportView(comp);
 425                 setPreferredSize(new Dimension(500,500));
 426         }
 427
 428         public AltosSiteMap() {
 429                 this(1);
 430         }
 431 }