X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=altoslib%2FAltosMapTransform.java;h=ae78befaa2a3f9d7b1290e351c769fca8a8f7eb2;hb=c61014914c80ad0dba72224109d9b147bb343562;hp=11ed4eb9c238e887669fe38ad9d64d1814ea2091;hpb=0f56903774d9e8bb033dfc0af6945e8ddc1d3065;p=fw%2Faltos

diff --git a/altoslib/AltosMapTransform.java b/altoslib/AltosMapTransform.java
index 11ed4eb9..ae78befa 100644
--- a/altoslib/AltosMapTransform.java
+++ b/altoslib/AltosMapTransform.java
@@ -15,7 +15,7 @@
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  */
 
-package org.altusmetrum.altoslib_7;
+package org.altusmetrum.altoslib_9;
 
 import java.io.*;
 import java.lang.Math;
@@ -117,4 +117,12 @@ public class AltosMapTransform {
 		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;
+	}
 }