From ee8437431a60877b18746512ba33c276dc24c1d8 Mon Sep 17 00:00:00 2001
From: jmt <jmt>
Date: Sat, 27 Mar 2010 12:18:51 +0000
Subject: [PATCH] Expose a flag indicating if the GPS is driving the AP (to
 give clearer user feedback when that is the case)

---
 src/Instrumentation/gps.cxx | 8 +++++++-
 src/Instrumentation/gps.hxx | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/Instrumentation/gps.cxx b/src/Instrumentation/gps.cxx
index 740c70a38..c44cd7110 100644
--- a/src/Instrumentation/gps.cxx
+++ b/src/Instrumentation/gps.cxx
@@ -303,6 +303,7 @@ GPS::init ()
   fromFlag->alias(wp1_node->getChild("from-flag"));
     
 // autopilot drive properties
+  _apDrivingFlag = fgGetNode("/autopilot/settings/gps-driving-true-heading", true);
   _apTrueHeading = fgGetNode("/autopilot/settings/true-heading-deg",true);
   _apTargetAltitudeFt = fgGetNode("/autopilot/settings/target-altitude-ft", true);
   _apAltitudeLock = fgGetNode("/autopilot/locks/altitude", true);
@@ -958,12 +959,17 @@ void GPS::updateRouteData()
 void GPS::driveAutopilot()
 {
   if (!_config.driveAutopilot() || !_realismSimpleGps->getBoolValue()) {
+    _apDrivingFlag->setBoolValue(false);
     return;
   }
  
   // compatability feature - allow the route-manager / GPS to drive the
   // generic autopilot heading hold *in leg mode only* 
-  if (_mode == "leg") {
+  
+  bool drive = _mode == "leg";
+  _apDrivingFlag->setBoolValue(drive);
+  
+  if (drive) {
     // FIXME: we want to set desired track, not heading, here
     _apTrueHeading->setDoubleValue(getWP1Bearing());
   }
diff --git a/src/Instrumentation/gps.hxx b/src/Instrumentation/gps.hxx
index 56936974d..f1a1b4396 100644
--- a/src/Instrumentation/gps.hxx
+++ b/src/Instrumentation/gps.hxx
@@ -413,6 +413,7 @@ private:
   SGPropertyNode_ptr _realismSimpleGps; ///< should the GPS be simple or realistic?
   
 // autopilot drive properties
+  SGPropertyNode_ptr _apDrivingFlag;
   SGPropertyNode_ptr _apTrueHeading;
   SGPropertyNode_ptr _apTargetAltitudeFt;
   SGPropertyNode_ptr _apAltitudeLock;
-- 
2.39.5