*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
-package org.altusmetrum.altoslib_7;
+package org.altusmetrum.altoslib_14;
import java.io.*;
import java.lang.Math;
double offset_x, offset_y;
+ int width, height;
+
public AltosLatLon lat_lon (AltosPointDouble point) {
double lat, lon;
double rads;
return lat_lon(screen_point(screen));
}
- public AltosPointDouble point(AltosLatLon lat_lon) {
+ public AltosPointDouble point(double lat, double lon) {
double x, y;
double e;
- x = lat_lon.lon * scale_x;
+ x = lon * scale_x;
- e = Math.sin(Math.toRadians(lat_lon.lat));
+ e = Math.sin(Math.toRadians(lat));
e = Math.max(e,-(1-1.0E-15));
e = Math.min(e, 1-1.0E-15 );
return new AltosPointDouble(x, y);
}
+ public AltosPointDouble point(AltosLatLon lat_lon) {
+ return point(lat_lon.lat, lat_lon.lon);
+ }
+
public AltosPointDouble screen(AltosPointDouble point) {
return new AltosPointDouble(point.x - offset_x, point.y - offset_y);
}
return screen(point(lat_lon));
}
+ public AltosPointDouble screen(double lat, double lon) {
+ return screen(point(lat, lon));
+ }
+
+ /* Return first longitude value which ends up on-screen */
+ public double first_lon(double lon) {
+ /* Find a longitude left of the screen */
+ for (;;) {
+ double x = lon * scale_x - offset_x;
+ if (x < 0)
+ break;
+ lon -= 360.0;
+ }
+ /* Find the first longitude on the screen */
+ for (;;) {
+ double x = lon * scale_x - offset_x;
+ if (x >= 0)
+ break;
+ lon += 360.0;
+ }
+ return lon;
+ }
+
+ /* Return last longitude value which ends up on-screen */
+ public double last_lon(double lon) {
+ lon = first_lon(lon);
+
+ for(;;) {
+ double next_lon = lon + 360.0;
+ double next_x = next_lon * scale_x - offset_x;
+ if (next_x >= width)
+ break;
+ lon = next_lon;
+ }
+ return lon;
+ }
+
private boolean has_location;
public boolean has_location() {
scale_x = 256/360.0 * Math.pow(2, zoom);
scale_y = 256/(2.0*Math.PI) * Math.pow(2, zoom);
+ this.width = width;
+ this.height = height;
+
AltosPointDouble centre_pt = point(centre_lat_lon);
has_location = (centre_lat_lon.lat != 0 || centre_lat_lon.lon != 0);
offset_x = centre_pt.x - width / 2.0;
offset_y = centre_pt.y - height / 2.0;
}
+
+ public static double lon_from_distance(double lat, double distance) {
+ double c = AltosGreatCircle.earth_radius * Math.cos(lat * Math.PI / 180) * 2 * Math.PI;
+
+ if (c < 10)
+ return 0;
+ return distance/c * 360.0;
+ }
}