2 * Copyright © 2010 Anthony Towns <aj@erisian.com.au>
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.
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.
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.
21 import java.awt.image.*;
22 import java.awt.event.*;
24 import javax.swing.event.MouseInputAdapter;
25 import javax.imageio.ImageIO;
26 import javax.swing.table.*;
30 import java.util.prefs.*;
31 import java.lang.Math;
32 import java.awt.geom.Point2D;
33 import java.awt.geom.Line2D;
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
39 static final double tile_size_nmi = 1.5;
41 static final int px_size = 512;
43 private static Point2D.Double translatePoint(Point2D.Double p,
46 return new Point2D.Double(p.x + d.x, p.y + d.y);
50 public double lat, lng;
51 public LatLng(double lat, double lng) {
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);
66 private static Point2D.Double pt(LatLng latlng,
67 double scale_x, double scale_y)
69 Point2D.Double res = new Point2D.Double();
72 res.x = latlng.lng * scale_x;
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 );
78 res.y = 0.5*Math.log((1+e)/(1-e))*-scale_y;
82 static private LatLng latlng(Point2D.Double pt,
83 double scale_x, double scale_y)
89 rads = 2 * Math.atan(Math.exp(-pt.y/scale_y));
90 lat = Math.toDegrees(rads - Math.PI/2);
92 return new LatLng(lat,lng);
96 double scale_x, scale_y;
98 private Point2D.Double pt(double lat, double lng) {
99 return pt(new LatLng(lat, lng), scale_x, scale_y);
102 private LatLng latlng(double x, double y) {
103 return latlng(new Point2D.Double(x,y), scale_x, scale_y);
105 private LatLng latlng(Point2D.Double pt) {
106 return latlng(pt, scale_x, scale_y);
109 AltosSiteMapTile [] mapTiles = new AltosSiteMapTile[9];
110 Point2D.Double [] tileOffset = new Point2D.Double[9];
112 private Point2D.Double getBaseLocation(double lat, double lng) {
113 Point2D.Double locn, north_step;
116 // stupid loop structure to please Java's control flow analysis
119 scale_x = 256/360.0 * Math.pow(2, zoom);
120 scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
122 north_step = pt(lat+tile_size_nmi*4/3/60.0, lng);
123 if (locn.y - north_step.y > px_size)
126 locn.x = -px_size * Math.floor(locn.x/px_size);
127 locn.y = -px_size * Math.floor(locn.y/px_size);
131 public void reset() {
135 private void bgLoadMap(final int i,
136 final File pngfile, final String pngurl)
138 Thread thread = new Thread() {
141 res = AltosSiteMapCache.fetchAndLoadMap(pngfile, pngurl);
143 mapTiles[i].loadMap(res);
145 System.out.printf("# Failed to fetch file %s\n", pngfile);
146 System.out.printf(" wget -O '%s' ''\n", pngfile, pngurl);
153 public static void prefetchMaps(double lat, double lng, int w, int h) {
154 AltosPreferences.init(null);
156 AltosSiteMap asm = new AltosSiteMap(true);
157 Point2D.Double c = asm.getBaseLocation(lat, lng);
158 Point2D.Double p = new Point2D.Double();
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);
173 System.out.printf("# Failed to fetch file %s\n", pngfile);
174 System.out.printf(" wget -O '%s' ''\n", pngfile, pngurl);
180 private void initMaps(double lat, double lng) {
181 Point2D.Double c = getBaseLocation(lat, lng);
182 Point2D.Double p = new Point2D.Double();
184 for (int i = 0; i < 9; i++) {
185 int x = i%3 - 1, y = i/3 - 1;
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);
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);
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));
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);
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.locked) {
217 if (state.pad_lat == 0 && state.pad_lon == 0)
219 if (state.gps.nsat < 4)
224 initMaps(state.pad_lat, state.pad_lon);
228 Point2D.Double pt = pt(state.gps.lat, state.gps.lon);
229 for (int x = 0; x < mapTiles.length; x++) {
230 mapTiles[x].show(state, crc_errors,
231 translatePoint(pt, tileOffset[x]));
235 private AltosSiteMap(boolean knowWhatYouAreDoing) {
236 if (!knowWhatYouAreDoing) {
237 throw new RuntimeException("Arggh.");
241 public AltosSiteMap() {
242 JComponent comp = new JComponent() {
243 GrabNDrag scroller = new GrabNDrag(this);
245 addMouseMotionListener(scroller);
246 addMouseListener(scroller);
247 setAutoscrolls(true);
251 GridBagLayout layout = new GridBagLayout();
252 comp.setLayout(layout);
254 GridBagConstraints c = new GridBagConstraints();
255 c.anchor = GridBagConstraints.CENTER;
256 c.fill = GridBagConstraints.BOTH;
258 // put some space between the map tiles, debugging only
259 // c.insets = new Insets(5, 5, 5, 5);
260 for (int x = 0; x < 9; x++) {
263 mapTiles[x] = new AltosSiteMapTile(px_size);
264 layout.setConstraints(mapTiles[x], c);
265 comp.add(mapTiles[x]);
267 setViewportView(comp);
268 setPreferredSize(new Dimension(500,200));