altosui: Add a few simple unit conversions

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

diff --git a/altosui/AltosConvert.java b/altosui/AltosConvert.java
index 207470a5eb5ef6016341dc0fd0d8986db65c51ab..db7039ec5294a5dc16b8e99248a6612360fb3a0a 100644 (file)
--- a/altosui/AltosConvert.java
+++ b/altosui/AltosConvert.java
@@ -234,6 +234,18 @@ public class AltosConvert {
                return array;
        }
 
+       static double meters_to_feet(double meters) {
+               return meters * (100 / (2.54 * 12));
+       }
+
+       static double meters_to_mach(double meters) {
+               return meters / 343;            /* something close to mach at usual rocket sites */
+       }
+
+       static double meters_to_g(double meters) {
+               return meters / 9.80665;
+       }
+
        static int checksum(int[] data, int start, int length) {
                int     csum = 0x5a;
                for (int i = 0; i < length; i++)