- int off_x;
- int off_y;
-
- int px_size = 512;
-
- private boolean setLocation(double lat, double lng) {
- Point2D.Double north_1nm;
- for (zoom = 3; zoom < 22; zoom++) {
- coord_pt = pt(lat, lng, new Point2D.Double(0,0), zoom);
- north_1nm = pt(lat+1/60.0, lng, new Point2D.Double(0,0), zoom);
- if (coord_pt.y - north_1nm.y > px_size/2)
- break;
- }
- coord_pt.x = px_size/2 - ((long)coord_pt.x/px_size + off_x) * px_size;
- coord_pt.y = px_size/2 - ((long)coord_pt.y/px_size + off_y) * px_size;
-
- scale_x = 256/360.0 * Math.pow(2, zoom);
- scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
-
- last_pt = null;
-
- Point2D.Double map_latlng;
- map_latlng = latlng(new Point2D.Double(px_size/2, px_size/2));
-
- BufferedImage myPicture;
- File pngfile = new File(AltosPreferences.logdir(),
- FileCoord(map_latlng, zoom));
- try {
- myPicture = ImageIO.read(pngfile);
- System.out.printf("# Found file %s\n", pngfile);
- } catch (Exception e) {
- // throw new RuntimeException(e);
- System.out.printf("# Failed to find file %s\n", pngfile);
- System.out.printf(" wget -O '%s' 'http://maps.google.com/maps/api/staticmap?center=%.6f,%.6f&zoom=%d&size=%dx%d&sensor=false&maptype=hybrid&format=png32'\n", pngfile, map_latlng.x, map_latlng.y, zoom, px_size, px_size);
- myPicture = new BufferedImage(px_size, px_size,
- BufferedImage.TYPE_INT_RGB);
- }
- setIcon(new ImageIcon( myPicture ));
- g2d = myPicture.createGraphics();
- return true;
- }
-
- private static double limit(double v, double lo, double hi) {
- if (v < lo)
- return lo;
- if (hi < v)
- return hi;
- return v;
- }
-
- private static String FileCoord(Point2D.Double latlng, int zoom) {
- double lat, lng;
- lat = latlng.x;
- lng = latlng.y;
- return FileCoord(lat, lng, zoom);
- }
- private static String FileCoord(double lat, double lng, int zoom) {
- char chlat = lat < 0 ? 'S' : 'N';
- char chlng = lng < 0 ? 'E' : 'W';
- if (lat < 0) lat = -lat;
- if (lng < 0) lng = -lng;
- return String.format("map-%c%.6f,%c%.6f-%d.png",
- chlat, lat, chlng, lng, zoom);
- }
-
-
- // based on google js
- // http://maps.gstatic.com/intl/en_us/mapfiles/api-3/2/10/main.js
- // search for fromLatLngToPoint and fromPointToLatLng
- private Point2D.Double pt(double lat, double lng) {
- return pt(lat, lng, coord_pt, scale_x, scale_y);
- }
-
- private static Point2D.Double pt(double lat, double lng,
- Point2D.Double centre, int zoom)
- {
- double scale_x = 256/360.0 * Math.pow(2, zoom);
- double scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
- return pt(lat, lng, centre, scale_x, scale_y);
- }
-
- private static Point2D.Double pt(double lat, double lng,
- Point2D.Double centre, double scale_x, double scale_y)
- {
- Point2D.Double res = new Point2D.Double();
- double e;
-
- res.x = centre.x + lng*scale_x;
- e = limit(Math.sin(Math.toRadians(lat)),-(1-1.0E-15),1-1.0E-15);
- res.y = centre.y + 0.5*Math.log((1+e)/(1-e))*-scale_y;
- return res;
- }
-
- private Point2D.Double latlng(Point2D.Double pt) {
- return latlng(pt, coord_pt);
- }
- private Point2D.Double latlng(Point2D.Double pt, Point2D.Double centre) {
- double lat, lng;
- double rads;
-
- lng = (pt.x - centre.x)/scale_x;
- rads = 2 * Math.atan(Math.exp((pt.y-centre.y)/-scale_y));
- lat = Math.toDegrees(rads - Math.PI/2);
-
- return new Point2D.Double(lat,lng);