altosdroid: Select tracker by clicking on map

This lets you pick a  tracker from the map, rather than having to use
the menu.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/altoslib/AltosMapTransform.java b/altoslib/AltosMapTransform.java
index 30994ecb..11ed4eb9 100644
--- a/altoslib/AltosMapTransform.java
+++ b/altoslib/AltosMapTransform.java
@@ -51,6 +51,13 @@ public class AltosMapTransform {
 		return new AltosPointDouble(screen.x + offset_x, screen.y + offset_y);
 	}
 
+	public double hypot(AltosLatLon a, AltosLatLon b) {
+		AltosPointDouble	a_pt = point(a);
+		AltosPointDouble	b_pt = point(b);
+
+		return Math.hypot(a_pt.x - b_pt.x, a_pt.y - b_pt.y);
+	}
+
 	public AltosLatLon screen_lat_lon(AltosPointInt screen) {
 		return lat_lon(screen_point(screen));
 	}