Use some C++ FOOmagic to get the lat and lon updated in the property tree properly

src/AIModel/AIBase.cxx

@@ -42,7 +42,14 @@
 
 #include "AIBase.hxx"
 
+FGAIBase *FGAIBase::_self = NULL;
+
+FGAIBase::FGAIBase() {
+    _self = this;
+}
+
 FGAIBase::~FGAIBase() {
+    _self = NULL;
 }
 
 void FGAIBase::update(double dt) {
@@ -81,8 +88,12 @@ void FGAIBase::bind() {
    props->tie("velocities/vertical-speed-fps", SGRawValuePointer<double>(&vs));
 
    props->tie("position/altitude-ft", SGRawValuePointer<double>(&altitude));
-   props->tie("position/latitude-deg", SGRawValuePointer<double>(&lat));
+   props->tie("position/latitude-deg",
-   props->tie("position/longitude-deg", SGRawValuePointer<double>(&lon));
+               SGRawValueFunctions<double>(FGAIBase::_getLatitude,
+                                           FGAIBase::_setLatitude));
+   props->tie("position/longitude-deg",
+               SGRawValueFunctions<double>(FGAIBase::_getLongitude,
+                                           FGAIBase::_setLongitude));
 
    props->tie("orientation/pitch-deg", SGRawValuePointer<double>(&pitch));
    props->tie("orientation/roll-deg", SGRawValuePointer<double>(&roll));
@@ -101,3 +112,16 @@ void FGAIBase::unbind() {
     props->untie("orientation/roll-deg");
     props->untie("orientation/heading-deg");
 }
+
+
+void FGAIBase::_setLongitude( double longitude ) {
+    _self->pos.setlon(longitude);
+}
+
+void FGAIBase::_setLatitude ( double latitude )  {
+    _self->pos.setlat(latitude);
+}
+
+double FGAIBase::_getLongitude() { return _self->pos.lon(); }
+
+double FGAIBase::_getLatitude () { return _self->pos.lat(); }

src/AIModel/AIBase.hxx

@@ -29,8 +29,13 @@ SG_USING_STD(string);
 
 class FGAIBase {
 
+private:
+
+    static FGAIBase *_self;
+
 public:
 
+    FGAIBase();
     virtual ~FGAIBase();
     virtual void update(double dt);
     inline Point3D GetPos() { return(pos); }
@@ -42,9 +47,9 @@ public:
     void setPath( const char* model );
     void setSpeed( double speed_KTAS );
     void setAltitude( double altitude_ft );
-    void setLongitude( double longitude );
-    void setLatitude( double latitude );
     void setHeading( double heading );
+    void setLatitude( double latitude );
+    void setLongitude( double longitude );
 
     void setDie( bool die );
     bool getDie();
@@ -54,7 +59,6 @@ protected:
     SGPropertyNode *props;
 
     Point3D pos;	// WGS84 lat & lon in degrees, elev above sea-level in meters
-    double lat, lon;	// As above, this is needed for the property bindings
     double hdg;		// True heading in degrees
     double roll;	// degrees, left is negative
     double pitch;	// degrees, nose-down is negative
@@ -77,6 +81,11 @@ protected:
 
     void Transform();
 
+private:
+    static void _setLongitude( double longitude );
+    static void _setLatitude ( double latitude );
+    static double _getLongitude();
+    static double _getLatitude ();
 };
 
 
@@ -93,21 +102,18 @@ inline void FGAIBase::setAltitude( double altitude_ft ) {
   pos.setelev(altitude * SG_FEET_TO_METER);
 }
 
-
-inline void FGAIBase::setLongitude( double longitude ) {
-  lon = longitude;
-  pos.setlon(longitude);
-}
-
-inline void FGAIBase::setLatitude( double latitude ) {
-  lat = latitude;
-  pos.setlat(latitude);
-}
-
 inline void FGAIBase::setHeading( double heading ) {
   hdg = tgt_heading = heading;
 }
 
+inline void FGAIBase::setLongitude( double longitude ) {
+    pos.setlon( longitude );
+}
+
+inline void FGAIBase::setLatitude ( double latitude ) {
+    pos.setlat( latitude );
+}
+
 inline void FGAIBase::setDie( bool die ) { delete_me = die; }
 inline bool FGAIBase::getDie() { return delete_me; }