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   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 = 1.5;
  40
  41         static final int px_size = 512;
  42
  43         private static Point2D.Double translatePoint(Point2D.Double p,
  44                         Point2D.Double d)
  45         {
  46                 return new Point2D.Double(p.x + d.x, p.y + d.y);
  47         }
  48
  49         static class LatLng {
  50                 public double lat, lng;
  51                 public LatLng(double lat, double lng) {
  52                         this.lat = lat;
  53                         this.lng = lng;
  54                 }
  55         }
  56
  57         // based on google js
  58         //  http://maps.gstatic.com/intl/en_us/mapfiles/api-3/2/10/main.js
  59         // search for fromLatLngToPoint and fromPointToLatLng
  60         private static Point2D.Double pt(LatLng latlng, int zoom) {
  61                 double scale_x = 256/360.0 * Math.pow(2, zoom);
  62                 double scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
  63                 return pt(latlng, scale_x, scale_y);
  64         }
  65
  66         private static Point2D.Double pt(LatLng latlng,
  67                                          double scale_x, double scale_y)
  68         {
  69                 Point2D.Double res = new Point2D.Double();
  70                 double e;
  71
  72                 res.x = latlng.lng * scale_x;
  73
  74                 e = Math.sin(Math.toRadians(latlng.lat));
  75                 e = Math.max(e,-(1-1.0E-15));
  76                 e = Math.min(e,  1-1.0E-15 );
  77
  78                 res.y = 0.5*Math.log((1+e)/(1-e))*-scale_y;
  79                 return res;
  80         }
  81
  82         static private LatLng latlng(Point2D.Double pt,
  83                                      double scale_x, double scale_y)
  84         {
  85                 double lat, lng;
  86                 double rads;
  87
  88                 lng = pt.x/scale_x;
  89                 rads = 2 * Math.atan(Math.exp(-pt.y/scale_y));
  90                 lat = Math.toDegrees(rads - Math.PI/2);
  91
  92                 return new LatLng(lat,lng);
  93         }
  94
  95         int zoom;
  96         double scale_x, scale_y;
  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         private LatLng latlng(Point2D.Double pt) {
 106                 return latlng(pt, scale_x, scale_y);
 107         }
 108
 109         AltosSiteMapTile [] mapTiles = new AltosSiteMapTile[9];
 110         Point2D.Double [] tileOffset = new Point2D.Double[9];
 111
 112         private Point2D.Double getBaseLocation(double lat, double lng) {
 113                 Point2D.Double locn, north_step;
 114
 115                 zoom = 2;
 116                 // stupid loop structure to please Java's control flow analysis
 117                 do {
 118                         zoom++;
 119                         scale_x = 256/360.0 * Math.pow(2, zoom);
 120                         scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
 121                         locn = pt(lat, lng);
 122                         north_step = pt(lat+tile_size_nmi*4/3/60.0, lng);
 123                         if (locn.y - north_step.y > px_size)
 124                                 break;
 125                 } while (zoom < 22);
 126                 locn.x = -px_size * Math.floor(locn.x/px_size);
 127                 locn.y = -px_size * Math.floor(locn.y/px_size);
 128                 return locn;
 129         }
 130
 131         public void reset() {
 132                 // nothing
 133         }
 134
 135         private void bgLoadMap(final int i,
 136                                final File pngfile, final String pngurl)
 137         {
 138                 Thread thread = new Thread() {
 139                         public void run() {
 140                                 ImageIcon res;
 141                                 res = AltosSiteMapCache.fetchAndLoadMap(pngfile, pngurl);
 142                                 if (res != null) {
 143                                         mapTiles[i].loadMap(res);
 144                                 } else {
 145                                         System.out.printf("# Failed to fetch file %s\n", pngfile);
 146                                         System.out.printf(" wget -O '%s' ''\n", pngfile, pngurl);
 147                                 }
 148                         }
 149                 };
 150                 thread.start();
 151         }
 152
 153         public static void prefetchMaps(double lat, double lng, int w, int h) {
 154                 AltosPreferences.init(null);
 155
 156                 AltosSiteMap asm = new AltosSiteMap(true);
 157                 Point2D.Double c = asm.getBaseLocation(lat, lng);
 158                 Point2D.Double p = new Point2D.Double();
 159                 Point2D.Double p2;
 160                 int dx = -w/2, dy = -h/2;
 161                 for (int y = dy; y < h+dy; y++) {
 162                         for (int x = dx; x < w+dx; x++) {
 163                                 LatLng map_latlng = asm.latlng(
 164                                                             -c.x + x*px_size + px_size/2,
 165                                                             -c.y + y*px_size + px_size/2);
 166                                 File pngfile = asm.MapFile(map_latlng.lat, map_latlng.lng);
 167                                 String pngurl = asm.MapURL(map_latlng.lat, map_latlng.lng);
 168                                 if (pngfile.exists()) {
 169                                         System.out.printf("Already have %s\n", pngfile);
 170                                 } else if (AltosSiteMapCache.fetchMap(pngfile, pngurl)) {
 171                                         System.out.printf("Fetched map %s\n", pngfile);
 172                                 } else {
 173                                         System.out.printf("# Failed to fetch file %s\n", pngfile);
 174                                         System.out.printf(" wget -O '%s' ''\n", pngfile, pngurl);
 175                                 }
 176                         }
 177                 }
 178         }
 179
 180         private void initMaps(double lat, double lng) {
 181                 Point2D.Double c = getBaseLocation(lat, lng);
 182                 Point2D.Double p = new Point2D.Double();
 183
 184                 for (int i = 0; i < 9; i++) {
 185                         int x = i%3 - 1, y = i/3 - 1;
 186
 187                         tileOffset[i] = new Point2D.Double(
 188                                 c.x - x*px_size, p.y = c.y - y*px_size);
 189                         LatLng map_latlng = latlng(
 190                                                     -tileOffset[i].x+px_size/2,
 191                                                     -tileOffset[i].y+px_size/2);
 192
 193                         File pngfile = MapFile(map_latlng.lat, map_latlng.lng);
 194                         String pngurl = MapURL(map_latlng.lat, map_latlng.lng);
 195                         bgLoadMap(i, pngfile, pngurl);
 196                 }
 197         }
 198
 199         private File MapFile(double lat, double lng) {
 200                 char chlat = lat < 0 ? 'S' : 'N';
 201                 char chlng = lng < 0 ? 'E' : 'W';
 202                 if (lat < 0) lat = -lat;
 203                 if (lng < 0) lng = -lng;
 204                 return new File(AltosPreferences.logdir(),
 205                                 String.format("map-%c%.6f,%c%.6f-%d.png",
 206                                               chlat, lat, chlng, lng, zoom));
 207         }
 208
 209         private String MapURL(double lat, double lng) {
 210                 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);
 211         }
 212
 213         boolean initialised = false;
 214         public void show(AltosState state, int crc_errors) {
 215                 // if insufficient gps data, nothing to update
 216                 if (state.gps == null)
 217                         return;
 218                 if (!state.gps.locked) {
 219                         if (state.pad_lat == 0 && state.pad_lon == 0)
 220                                 return;
 221                         if (state.gps.nsat < 4)
 222                                 return;
 223                 }
 224
 225                 if (!initialised) {
 226                         initMaps(state.pad_lat, state.pad_lon);
 227                         initialised = true;
 228                 }
 229
 230                 Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
 231                 for (int x = 0; x < mapTiles.length; x++) {
 232                         mapTiles[x].show(state, crc_errors,
 233                                          translatePoint(pt, tileOffset[x]));
 234                 }
 235         }
 236
 237         private AltosSiteMap(boolean knowWhatYouAreDoing) {
 238                 if (!knowWhatYouAreDoing) {
 239                         throw new RuntimeException("Arggh.");
 240                 }
 241         }
 242
 243         public AltosSiteMap() {
 244                 JComponent comp = new JComponent() {
 245                         GrabNDrag scroller = new GrabNDrag(this);
 246                         {
 247                                 addMouseMotionListener(scroller);
 248                                 addMouseListener(scroller);
 249                                 setAutoscrolls(true);
 250                         }
 251                 };
 252
 253                 GridBagLayout layout = new GridBagLayout();
 254                 comp.setLayout(layout);
 255
 256                 GridBagConstraints c = new GridBagConstraints();
 257                 c.anchor = GridBagConstraints.CENTER;
 258                 c.fill = GridBagConstraints.BOTH;
 259
 260                 // put some space between the map tiles, debugging only
 261                 // c.insets = new Insets(5, 5, 5, 5);
 262                 for (int x = 0; x < 9; x++) {
 263                         c.gridx = x % 3;
 264                         c.gridy = x / 3;
 265                         mapTiles[x] = new AltosSiteMapTile(px_size);
 266                         layout.setConstraints(mapTiles[x], c);
 267                         comp.add(mapTiles[x]);
 268                 }
 269                 setViewportView(comp);
 270                 setPreferredSize(new Dimension(500,200));
 271         }
 272 }