altoslib: Start restructuring AltosState harder

Make per-packet code update state itself rather than having all state
updates done centrally. Will make adding new packet types easier.

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

1 files changed, 11 insertions, 1 deletions

diff --git a/altoslib/AltosGreatCircle.java b/altoslib/AltosGreatCircle.java
index f1cf0ae9..770c3c6c 100644
--- a/altoslib/AltosGreatCircle.java
+++ b/altoslib/AltosGreatCircle.java
@@ -19,7 +19,7 @@ package org.altusmetrum.altoslib_1;
 
 import java.lang.Math;
 
-public class AltosGreatCircle {
+public class AltosGreatCircle implements Cloneable {
 	public double	distance;
 	public double	bearing;
 	public double	range;
@@ -95,6 +95,16 @@ public class AltosGreatCircle {
 		elevation = Math.atan2(height_diff, distance) * 180 / Math.PI;
 	}
 
+	public AltosGreatCircle clone() {
+		AltosGreatCircle n = new AltosGreatCircle();
+
+		n.distance = distance;
+		n.bearing = bearing;
+		n.range = range;
+		n.elevation = elevation;
+		return n;
+	}
+
 	public AltosGreatCircle (double start_lat, double start_lon,
 				 double end_lat, double end_lon) {
 		this(start_lat, start_lon, 0, end_lat, end_lon, 0);