Updates to the net_gui code that can spit out updated flight information

to the network which a gui might be interested in.

src/Cockpit/radiostack.hxx

@@ -67,6 +67,7 @@ public:
     // Update nav/adf radios based on current postition
     void search ();
 
+    inline FGDME *get_dme() { return &dme; }
     inline FGNavCom *get_navcom1() { return &navcom1; }
     inline FGNavCom *get_navcom2() { return &navcom2; }
 };

src/Network/native_gui.cxx

@@ -30,6 +30,7 @@
 #include <simgear/io/iochannel.hxx>
 #include <simgear/timing/sg_time.hxx>
 
+#include <Cockpit/radiostack.hxx>
 #include <FDM/flight.hxx>
 #include <Time/tmp.hxx>
 #include <Main/fg_props.hxx>
@@ -69,6 +70,20 @@ static void htond (double &x)
         return;
     }
 }
+static void htonf (float &x)	
+{
+    if ( sgIsLittleEndian() ) {
+        int    *Float_Overlay;
+        int     Holding_Buffer;
+    
+        Float_Overlay = (int *) &x;
+        Holding_Buffer = Float_Overlay [0];
+    
+        Float_Overlay [0] = htonl (Holding_Buffer);
+    } else {
+        return;
+    }
+}
 
 
 FGNativeGUI::FGNativeGUI() {
@@ -129,25 +144,49 @@ void FGProps2NetGUI( FGNetGUI *net ) {
     net->cur_time = globals->get_time_params()->get_cur_time();
     net->warp = globals->get_warp();
 
+    // Approach
+    net->dist_nm = current_radiostack->get_dme()->get_dist();
+    net->course_deviation_deg
+        = current_radiostack->get_navcom1()->get_nav_heading()
+        - current_radiostack->get_navcom1()->get_nav_radial();
+    while ( net->course_deviation_deg >  180.0 ) {
+        net->course_deviation_deg -= 360.0;
+    }
+    while ( net->course_deviation_deg < -180.0 ) {
+        net->course_deviation_deg += 360.0;
+    }
+    if ( fabs(net->course_deviation_deg) > 90.0 )
+        net->course_deviation_deg
+            = ( net->course_deviation_deg<0.0
+                ? -net->course_deviation_deg - 180.0
+                : -net->course_deviation_deg + 180.0 );
+    net->gs_deviation_deg
+        = current_radiostack->get_navcom1()->get_nav_gs_needle_deflection()
+        / 5.0;
+
     // Convert the net buffer to network format
     net->version = htonl(net->version);
 
     htond(net->longitude);
     htond(net->latitude);
-    htond(net->altitude);
-    htond(net->phi);
-    htond(net->theta);
-    htond(net->psi);
-    htond(net->vcas);
-    htond(net->climb_rate);
+    htonf(net->altitude);
+    htonf(net->phi);
+    htonf(net->theta);
+    htonf(net->psi);
+    htonf(net->vcas);
+    htonf(net->climb_rate);
 
     for ( i = 0; i < net->num_tanks; ++i ) {
-        htond(net->fuel_quantity[i]);
+        htonf(net->fuel_quantity[i]);
     }
     net->num_tanks = htonl(net->num_tanks);
 
     net->cur_time = htonl( net->cur_time );
     net->warp = htonl( net->warp );
+
+    htonf(net->dist_nm);
+    htonf(net->course_deviation_deg);
+    htonf(net->gs_deviation_deg);
 }
 
 
@@ -159,21 +198,25 @@ void FGNetGUI2Props( FGNetGUI *net ) {
 
     htond(net->longitude);
     htond(net->latitude);
-    htond(net->altitude);
-    htond(net->phi);
-    htond(net->theta);
-    htond(net->psi);
-    htond(net->vcas);
-    htond(net->climb_rate);
+    htonf(net->altitude);
+    htonf(net->phi);
+    htonf(net->theta);
+    htonf(net->psi);
+    htonf(net->vcas);
+    htonf(net->climb_rate);
 
     net->num_tanks = htonl(net->num_tanks);
     for ( i = 0; i < net->num_tanks; ++i ) {
-	htond(net->fuel_quantity[i]);
+	htonf(net->fuel_quantity[i]);
     }
 
     net->cur_time = ntohl(net->cur_time);
     net->warp = ntohl(net->warp);
 
+    htonf(net->dist_nm);
+    htonf(net->course_deviation_deg);
+    htonf(net->gs_deviation_deg);
+
     if ( net->version == FG_NET_GUI_VERSION ) {
         // cout << "pos = " << net->longitude << " " << net->latitude << endl;
         // cout << "sea level rad = " << cur_fdm_state->get_Sea_level_radius()
@@ -200,6 +243,13 @@ void FGNetGUI2Props( FGNetGUI *net ) {
 	}
 
         globals->set_warp( net->warp );
+
+        // Approach
+        fgSetDouble( "/radios/dme/distance-nm", net->dist_nm );
+        fgSetDouble( "/radios/nav[0]/heading-needle-deflection",
+                     net->course_deviation_deg );
+        fgSetDouble( "/radios/nav[0]/gs-needle-deflection",
+                     net->gs_deviation_deg );
     } else {
 	SG_LOG( SG_IO, SG_ALERT,
                 "Error: version mismatch in FGNetNativeGUI2Props()" );

src/Network/net_gui.hxx

@@ -31,7 +31,7 @@
 #endif                                   
 
 
-const int FG_NET_GUI_VERSION = 1;
+const int FG_NET_GUI_VERSION = 2;
 
 
 // Define a structure containing the top level flight dynamics model
@@ -56,23 +56,28 @@ public:
     // Positions
     double longitude;		// geodetic (radians)
     double latitude;		// geodetic (radians)
-    double altitude;		// above sea level (meters)
-    double agl;			// above ground level (meters)
-    double phi;			// roll (radians)
-    double theta;		// pitch (radians)
-    double psi;			// yaw or true heading (radians)
+    float altitude;		// above sea level (meters)
+    float agl;			// above ground level (meters)
+    float phi;			// roll (radians)
+    float theta;		// pitch (radians)
+    float psi;			// yaw or true heading (radians)
 
     // Velocities
-    double vcas;
-    double climb_rate;		// feet per second
+    float vcas;
+    float climb_rate;		// feet per second
 
     // Consumables
     int num_tanks;		// Max number of fuel tanks
-    double fuel_quantity[FG_MAX_TANKS];
+    float fuel_quantity[FG_MAX_TANKS];
 
     // Environment
     time_t cur_time;            // current unix time
     long int warp;              // offset in seconds to unix time
+
+    // Approach
+    float dist_nm;              // distance to tuned navaid in nautical miles
+    float course_deviation_deg; // degrees off target course
+    float gs_deviation_deg;     // degrees off target glide slope
 };