Change fg_props.[ch]xx into a proper subsystem, under the control of

the subsystem manager.

Add properties for the individual parts of the time and date.

src/Main/fg_init.cxx

@@ -1455,7 +1455,13 @@ bool fgInitSubsystems() {
     ////////////////////////////////////////////////////////////////////
     // Initialize the property interpolator subsystem
     ////////////////////////////////////////////////////////////////////
-    globals->add_subsystem("interpolator", new SGInterpolator());
+    globals->add_subsystem("interpolator", new SGInterpolator);
+
+
+    ////////////////////////////////////////////////////////////////////
+    // Add the FlightGear property utilities.
+    ////////////////////////////////////////////////////////////////////
+    globals->add_subsystem("properties", new FGProperties);
 
     ////////////////////////////////////////////////////////////////////
     // Initialize the material property subsystem.
@@ -1743,13 +1749,6 @@ bool fgInitSubsystems() {
     }
 
     
-    ////////////////////////////////////////////////////////////////////
-    // Initialize the default (kludged) properties.
-    ////////////////////////////////////////////////////////////////////
-
-    fgInitProps();
-
-
     ////////////////////////////////////////////////////////////////////
     // Initialize the controls subsystem.
     ////////////////////////////////////////////////////////////////////

src/Main/fg_props.cxx

@@ -351,7 +351,6 @@ getGMTString ()
   return buf;
 }
 
-
 /**
  * Return the magnetic variation
  */
@@ -555,10 +554,22 @@ setFDMDataLogging (bool state)
 // Tie the properties.
 ////////////////////////////////////////////////////////////////////////
 
-void
-fgInitProps ()
+FGProperties::FGProperties ()
+{
+}
+
+FGProperties::~FGProperties ()
+{
+}
+
+void
+FGProperties::init ()
+{
+}
+
+void
+FGProperties::bind ()
 {
-  SG_LOG(SG_GENERAL, SG_DEBUG, "start of fgInitProps()" );
 				// Simulation
   fgTie("/sim/logging/priority", getLoggingPriority, setLoggingPriority);
   fgTie("/sim/logging/classes", getLoggingClasses, setLoggingClasses);
@@ -595,14 +606,61 @@ fgInitProps ()
   fgTie("/sim/temp/winding-ccw", getWindingCCW, setWindingCCW, false);
   fgTie("/sim/temp/full-screen", getFullScreen, setFullScreen);
   fgTie("/sim/temp/fdm-data-logging", getFDMDataLogging, setFDMDataLogging);
-
-  SG_LOG(SG_GENERAL, SG_DEBUG, "end of fgInitProps()" );
 }
 
+void
+FGProperties::unbind ()
+{
+				// Simulation
+  fgUntie("/sim/logging/priority");
+  fgUntie("/sim/logging/classes");
+  fgUntie("/sim/freeze/master");
+  fgUntie("/sim/aircraft-dir");
+
+  fgUntie("/sim/time/elapsed-sec");
+  fgUntie("/sim/time/gmt");
+  fgUntie("/sim/time/gmt-string");
+
+				// Orientation
+  fgUntie("/orientation/heading-magnetic-deg");
+
+				// Environment
+#ifdef FG_WEATHERCM
+  fgUntie("/environment/visibility-m");
+  fgUntie("/environment/wind-from-north-fps");
+  fgUntie("/environment/wind-from-east-fps");
+  fgUntie("/environment/wind-from-down-fps");
+#endif
+
+  fgUntie("/environment/magnetic-variation-deg");
+  fgUntie("/environment/magnetic-dip-deg");
+
+  fgUntie("/sim/time/warp");
+  fgUntie("/sim/time/warp-delta");
+
+				// Misc. Temporary junk.
+  fgUntie("/sim/temp/winding-ccw");
+  fgUntie("/sim/temp/full-screen");
+  fgUntie("/sim/temp/fdm-data-logging");
+}
 
 void
-fgUpdateProps ()
+FGProperties::update (double dt)
 {
+                                // Date and time
+    struct tm * t = globals->get_time_params()->getGmt();
+
+    fgSetInt("/sim/time/utc/year", t->tm_year + 1900);
+    fgSetInt("/sim/time/utc/month", t->tm_mon + 1);
+    fgSetInt("/sim/time/utc/day", t->tm_mday);
+    fgSetInt("/sim/time/utc/hour", t->tm_hour);
+    fgSetInt("/sim/time/utc/minute", t->tm_min);
+    fgSetInt("/sim/time/utc/second", t->tm_sec);
+
+    fgSetDouble("/sim/time/utc/day-seconds",
+                t->tm_hour * 3600 +
+                t->tm_min * 60 +
+                t->tm_sec);
 }
 
 

src/Main/fg_props.hxx

@@ -9,6 +9,7 @@
 #include <simgear/debug/logstream.hxx>
 #include <simgear/props/props.hxx>
 #include <simgear/props/props_io.hxx>
+#include <simgear/structure/subsystem_mgr.hxx>
 
 #include "globals.hxx"
 
@@ -17,25 +18,17 @@
 // Property management.
 ////////////////////////////////////////////////////////////////////////
 
+class FGProperties : public SGSubsystem
+{
+public:
+    FGProperties ();
+    virtual ~FGProperties ();
 
-/**
- * Initialize the default FlightGear properties.
- *
- * These are mostly properties that haven't been claimed by a
- * specific module yet.  This function should be invoked once,
- * while the program is starting (and after the global property
- * tree has been created).
- */
-extern void fgInitProps ();	// fixme: how are they untied?
-
-
-/**
- * Update the default FlightGear properties.
- *
- * This function should be invoked once in each loop to update all
- * of the default properties.
- */
-extern void fgUpdateProps ();
+    void init ();
+    void bind ();
+    void unbind ();
+    void update (double dt);
+};
 
 
 /**

src/Main/main.cxx

@@ -371,9 +371,6 @@ void fgRenderFrame() {
     static const SGPropertyNode *groundlevel_nearplane
         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 
-    // Update the default (kludged) properties.
-    fgUpdateProps();
-
     FGViewer *current__view = globals->get_current_view();
 
     FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));