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         private Point2D.Double pt(double lat, double lng) {
 101                 return pt(new LatLng(lat, lng), scale_x, scale_y);
 102         }
 103
 104         private LatLng latlng(double x, double y) {
 105                 return latlng(new Point2D.Double(x,y), scale_x, scale_y);
 106         }
 107         private LatLng latlng(Point2D.Double pt) {
 108                 return latlng(pt, scale_x, scale_y);
 109         }
 110
 111         HashMap<Point,AltosSiteMapTile> mapTiles = new HashMap<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         private void bgLoadMap(final AltosSiteMapTile tile,
 148                                final File pngfile, final String pngurl)
 149         {
 150                 //System.out.printf("Loading/fetching map %s\n", pngfile);
 151                 Thread thread = new Thread() {
 152                         public void run() {
 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' ''\n", pngfile, pngurl);
 163                                 }
 164                         }
 165                 };
 166                 thread.start();
 167         }
 168
 169         File    pngfile;
 170         String  pngurl;
 171
 172         public int prefetchMap(int x, int y) {
 173                 LatLng map_latlng = latlng(
 174                         -centre.x + x*px_size + px_size/2,
 175                         -centre.y + y*px_size + px_size/2);
 176                 pngfile = MapFile(map_latlng.lat, map_latlng.lng);
 177                 pngurl = MapURL(map_latlng.lat, map_latlng.lng);
 178                 if (pngfile.exists()) {
 179                         return 1;
 180                 } else if (AltosSiteMapCache.fetchMap(pngfile, pngurl)) {
 181                         return 0;
 182                 } else {
 183                         return -1;
 184                 }
 185         }
 186
 187         public static void prefetchMaps(double lat, double lng, int w, int h) {
 188                 AltosSiteMap asm = new AltosSiteMap(true);
 189                 asm.centre = asm.getBaseLocation(lat, lng);
 190
 191                 Point2D.Double p = new Point2D.Double();
 192                 Point2D.Double p2;
 193                 int dx = -w/2, dy = -h/2;
 194                 for (int y = dy; y < h+dy; y++) {
 195                         for (int x = dx; x < w+dx; x++) {
 196                                 int r = asm.prefetchMap(x, y);
 197                                 switch (r) {
 198                                 case 1:
 199                                         System.out.printf("Already have %s\n", asm.pngfile);
 200                                         break;
 201                                 case 0:
 202                                         System.out.printf("Fetched map %s\n", asm.pngfile);
 203                                         break;
 204                                 case -1:
 205                                         System.out.printf("# Failed to fetch file %s\n", asm.pngfile);
 206                                         System.out.printf(" wget -O '%s' ''\n", asm.pngfile, asm.pngurl);
 207                                         break;
 208                                 }
 209                         }
 210                 }
 211         }
 212
 213         private void initMap(AltosSiteMapTile tile, Point offset) {
 214                 Point2D.Double coord = tileCoordOffset(offset);
 215
 216                 LatLng map_latlng = latlng(px_size/2-coord.x, px_size/2-coord.y);
 217
 218                 File pngfile = MapFile(map_latlng.lat, map_latlng.lng);
 219                 String pngurl = MapURL(map_latlng.lat, map_latlng.lng);
 220                 bgLoadMap(tile, pngfile, pngurl);
 221         }
 222
 223         private void initMaps(double lat, double lng) {
 224                 centre = getBaseLocation(lat, lng);
 225
 226                 for (Point k : mapTiles.keySet()) {
 227                         initMap(mapTiles.get(k), k);
 228                 }
 229         }
 230
 231         private File MapFile(double lat, double lng) {
 232                 char chlat = lat < 0 ? 'S' : 'N';
 233                 char chlng = lng < 0 ? 'W' : 'E';
 234                 if (lat < 0) lat = -lat;
 235                 if (lng < 0) lng = -lng;
 236                 return new File(AltosPreferences.mapdir(),
 237                                 String.format("map-%c%.6f,%c%.6f-%d.png",
 238                                               chlat, lat, chlng, lng, zoom));
 239         }
 240
 241         private String MapURL(double lat, double lng) {
 242                 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);
 243         }
 244
 245         boolean initialised = false;
 246         Point2D.Double last_pt = null;
 247         int last_state = -1;
 248
 249         public void show(double lat, double lon) {
 250                 initMaps(lat, lon);
 251                 initialised = true;
 252                 scrollRocketToVisible(pt(lat, lon));
 253         }
 254         public void show(final AltosState state, final int crc_errors) {
 255                 // if insufficient gps data, nothing to update
 256                 if (!state.gps.locked && state.gps.nsat < 4)
 257                         return;
 258
 259                 if (!initialised) {
 260                         if (state.pad_lat != 0 || state.pad_lon != 0) {
 261                                 initMaps(state.pad_lat, state.pad_lon);
 262                                 initialised = true;
 263                         } else if (state.gps.lat != 0 || state.gps.lon != 0) {
 264                                 initMaps(state.gps.lat, state.gps.lon);
 265                                 initialised = true;
 266                         } else {
 267                                 return;
 268                         }
 269                 }
 270
 271                 final Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
 272                 if (last_pt == pt && last_state == state.state)
 273                         return;
 274
 275                 if (last_pt == null) {
 276                         last_pt = pt;
 277                 }
 278                 boolean in_any = false;
 279                 for (Point offset : mapTiles.keySet()) {
 280                         AltosSiteMapTile tile = mapTiles.get(offset);
 281                         Point2D.Double ref, lref;
 282                         ref = translatePoint(pt, tileCoordOffset(offset));
 283                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 284                         tile.show(state, crc_errors, lref, ref);
 285                         if (0 <= ref.x && ref.x < px_size)
 286                                 if (0 <= ref.y && ref.y < px_size)
 287                                         in_any = true;
 288                 }
 289
 290                 Point offset = tileOffset(pt);
 291                 if (!in_any) {
 292                         Point2D.Double ref, lref;
 293                         ref = translatePoint(pt, tileCoordOffset(offset));
 294                         lref = translatePoint(last_pt, tileCoordOffset(offset));
 295
 296                         AltosSiteMapTile tile = createTile(offset);
 297                         tile.show(state, crc_errors, lref, ref);
 298                         initMap(tile, offset);
 299                         finishTileLater(tile, offset);
 300                 }
 301
 302                 scrollRocketToVisible(pt);
 303
 304                 if (offset != tileOffset(last_pt)) {
 305                         ensureTilesAround(offset);
 306                 }
 307
 308                 last_pt = pt;
 309                 last_state = state.state;
 310         }
 311
 312         private AltosSiteMapTile createTile(Point offset) {
 313                 AltosSiteMapTile tile = new AltosSiteMapTile(px_size);
 314                 mapTiles.put(offset, tile);
 315                 return tile;
 316         }
 317         private void finishTileLater(final AltosSiteMapTile tile,
 318                                      final Point offset)
 319         {
 320                 SwingUtilities.invokeLater( new Runnable() {
 321                         public void run() {
 322                                 addTileAt(tile, offset);
 323                         }
 324                 } );
 325         }
 326
 327         private void ensureTilesAround(Point base_offset) {
 328                 for (int x = -1; x <= 1; x++) {
 329                         for (int y = -1; y <= 1; y++) {
 330                                 Point offset = new Point(base_offset.x + x, base_offset.y + y);
 331                                 if (mapTiles.containsKey(offset))
 332                                         continue;
 333                                 AltosSiteMapTile tile = createTile(offset);
 334                                 initMap(tile, offset);
 335                                 finishTileLater(tile, offset);
 336                         }
 337                 }
 338         }
 339
 340         private Point topleft = new Point(0,0);
 341         private void scrollRocketToVisible(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                 if (Math.abs(dx) > r.width/4 || Math.abs(dy) > r.height/4) {
 347                         r.x += dx;
 348                         r.y += dy;
 349                         comp.scrollRectToVisible(r);
 350                 }
 351         }
 352
 353         private void addTileAt(AltosSiteMapTile tile, Point offset) {
 354                 if (Math.abs(offset.x) >= MAX_TILE_DELTA ||
 355                                 Math.abs(offset.y) >= MAX_TILE_DELTA)
 356                 {
 357                         System.out.printf("Rocket too far away from pad (tile %d,%d)\n",
 358                                           offset.x, offset.y);
 359                         return;
 360                 }
 361
 362                 boolean review = false;
 363                 Rectangle r = comp.getVisibleRect();
 364                 if (offset.x < topleft.x) {
 365                         r.x += (topleft.x - offset.x) * px_size;
 366                         topleft.x = offset.x;
 367                         review = true;
 368                 }
 369                 if (offset.y < topleft.y) {
 370                         r.y += (topleft.y - offset.y) * px_size;
 371                         topleft.y = offset.y;
 372                         review = true;
 373                 }
 374                 GridBagConstraints c = new GridBagConstraints();
 375                 c.anchor = GridBagConstraints.CENTER;
 376                 c.fill = GridBagConstraints.BOTH;
 377                 // put some space between the map tiles, debugging only
 378                 // c.insets = new Insets(5, 5, 5, 5);
 379
 380                 c.gridx = offset.x + MAX_TILE_DELTA;
 381                 c.gridy = offset.y + MAX_TILE_DELTA;
 382                 layout.setConstraints(tile, c);
 383
 384                 comp.add(tile);
 385                 if (review) {
 386                         comp.scrollRectToVisible(r);
 387                 }
 388         }
 389
 390         private AltosSiteMap(boolean knowWhatYouAreDoing) {
 391                 if (!knowWhatYouAreDoing) {
 392                         throw new RuntimeException("Arggh.");
 393                 }
 394         }
 395
 396         JComponent comp = new JComponent() { };
 397         private GridBagLayout layout = new GridBagLayout();
 398
 399         public AltosSiteMap() {
 400                 GrabNDrag scroller = new GrabNDrag(comp);
 401
 402                 comp.setLayout(layout);
 403
 404                 for (int x = -1; x <= 1; x++) {
 405                         for (int y = -1; y <= 1; y++) {
 406                                 Point offset = new Point(x, y);
 407                                 AltosSiteMapTile t = createTile(offset);
 408                                 addTileAt(t, offset);
 409                         }
 410                 }
 411                 setViewportView(comp);
 412                 setPreferredSize(new Dimension(500,500));
 413         }
 414 }