From 5c799d1ba27325bcd54937d08d5b48f8bfc5d035 Mon Sep 17 00:00:00 2001
From: david <david>
Date: Thu, 9 May 2002 21:56:07 +0000
Subject: [PATCH] Patch from Melchior Franz:

It's cumbersome to use the MagicCarpet as 3D cursor, because everytime
you shoot over the target you have first to turn by 180 degrees and to
fly back.

This patch lets the magic carpet fly backwards if brake[0] is active,
which is by default associated with the joystick's fire button.
---
 src/FDM/MagicCarpet.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/FDM/MagicCarpet.cxx b/src/FDM/MagicCarpet.cxx
index 58bf6ec31..738e1e564 100644
--- a/src/FDM/MagicCarpet.cxx
+++ b/src/FDM/MagicCarpet.cxx
@@ -56,6 +56,10 @@ void FGMagicCarpet::update( int multiloop ) {
 
     // speed and distance traveled
     double speed = globals->get_controls()->get_throttle( 0 ) * 2000; // meters/sec
+    if ( globals->get_controls()->get_brake( 0 ) ) {
+        speed = -speed;
+    }
+
     double dist = speed * time_step;
     double kts = speed * SG_METER_TO_NM * 3600.0;
     _set_V_equiv_kts( kts );
@@ -73,7 +77,7 @@ void FGMagicCarpet::update( int multiloop ) {
 
     // update (lon/lat) position
     double lat2, lon2, az2;
-    if ( speed > SG_EPSILON ) {
+    if ( fabs( speed ) > SG_EPSILON ) {
 	geo_direct_wgs_84 ( get_Altitude(),
 			    get_Latitude() * SGD_RADIANS_TO_DEGREES,
 			    get_Longitude() * SGD_RADIANS_TO_DEGREES,
-- 
2.39.5