]> git.mxchange.org Git - flightgear.git/blobdiff - src/Main/options.cxx
Fixed --enable-freeze.
[flightgear.git] / src / Main / options.cxx
index 0bc64b50b4dfb65c2ce9757b3385d4cc7fb3614a..1073c5635472bf8ffa5ede6c2b1f25ffdbe52eb9 100644 (file)
 #  include <config.h>
 #endif
 
-#if defined(FX) && defined(XMESA)
-bool global_fullscreen = true;
-#endif
-
 #include <simgear/compiler.h>
 
 #include <math.h>            // rint()
@@ -38,32 +34,36 @@ bool global_fullscreen = true;
 
 #include STL_STRING
 
-#include <simgear/constants.h>
-#include <simgear/debug/logstream.hxx>
 #include <simgear/misc/fgstream.hxx>
-#include <simgear/misc/props.hxx>
-#include <simgear/timing/sg_time.hxx>
-
-#include <Include/general.hxx>
-#include <Airports/simple.hxx>
-#include <Cockpit/cockpit.hxx>
-#include <FDM/flight.hxx>
-#include <FDM/UIUCModel/uiuc_aircraftdir.h>
+
+// #include <Include/general.hxx>
+// #include <Airports/simple.hxx>
+// #include <Cockpit/cockpit.hxx>
+// #include <FDM/flight.hxx>
+// #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 #ifdef FG_NETWORK_OLK
 #  include <NetworkOLK/network.h>
 #endif
 
-#include "fg_init.hxx"
 #include "globals.hxx"
+#include "fg_init.hxx"
+#include "fg_props.hxx"
 #include "options.hxx"
 
 FG_USING_STD(string);
 FG_USING_NAMESPACE(std);
 
-// from main.cxx
-extern void fgReshape( int width, int height );
 
-inline double
+#define NEW_DEFAULT_MODEL_HZ 120
+
+enum
+{
+    FG_OPTIONS_OK = 0,
+    FG_OPTIONS_HELP = 1,
+    FG_OPTIONS_ERROR = 2
+};
+
+static double
 atof( const string& str )
 {
 
@@ -75,7 +75,7 @@ atof( const string& str )
 #endif
 }
 
-inline int
+static int
 atoi( const string& str )
 {
 #ifdef __MWERKS__ 
@@ -87,37 +87,18 @@ atoi( const string& str )
 }
 
 
-// Defined the shared options class here
-// FGOptions current_options;
-
-#define PROP(name) (globals->get_props()->getValue(name, true))
-
-
-// Constructor
-FGOptions::FGOptions() 
+/**
+ * Set a few fail-safe default property values.
+ *
+ * These should all be set in $FG_ROOT/preferences.xml, but just
+ * in case, we provide some initial sane values here. This method 
+ * should be invoked *before* reading any init files.
+ */
+void
+fgSetDefaults ()
 {
-    char* envp = ::getenv( "FG_ROOT" );
-
-    if ( envp != NULL ) {
-       // fg_root could be anywhere, so default to environmental
-       // variable $FG_ROOT if it is set.
-        globals->set_fg_root(envp);
-    } else {
-       // Otherwise, default to a random compiled-in location if
-       // $FG_ROOT is not set.  This can still be overridden from the
-       // command line or a config file.
-
-#if defined( WIN32 )
-       globals->set_fg_root("\\FlightGear");
-#elif defined( macintosh )
-       globals->set_fg_root("");
-#else
-       globals->set_fg_root(PKGLIBDIR);
-#endif
-    }
-
     // set a possibly independent location for scenery data
-    envp = ::getenv( "FG_SCENERY" );
+    char *envp = ::getenv( "FG_SCENERY" );
 
     if ( envp != NULL ) {
        // fg_root could be anywhere, so default to environmental
@@ -127,170 +108,79 @@ FGOptions::FGOptions()
        // Otherwise, default to Scenery being in $FG_ROOT/Scenery
        globals->set_fg_scenery("");
     }
-}
-
-void
-FGOptions::init ()
-{
-                               // These are all deprecated, and will
-                               // be removed gradually.
-  airport_id = PROP("/sim/startup/airport-id");
-  lon = PROP("/position/longitude");
-  lat = PROP("/position/latitude");
-  altitude = PROP("/position/altitude");
-  heading = PROP("/orientation/heading");
-  roll = PROP("/orientation/roll");
-  pitch = PROP("/orientation/pitch");
-  speedset = PROP("/sim/startup/speed-set");
-  uBody = PROP("/velocities/uBody");
-  vBody = PROP("/velocities/vBody");
-  wBody = PROP("/velocities/wBody");
-  vNorth = PROP("/velocities/speed-north");
-  vEast = PROP("/velocities/speed-east");
-  vDown = PROP("/velocities/speed-down");
-  vkcas = PROP("/velocities/knots");
-  mach = PROP("/velocities/mach");
-  game_mode = PROP("/sim/startup/game-mode");
-  splash_screen = PROP("/sim/startup/splash-screen");
-  intro_music = PROP("/sim/startup/intro-music");
-  mouse_pointer = PROP("/sim/startup/mouse-pointer");
-  control_mode = PROP("/sim/control-mode");
-  auto_coordination = PROP("/sim/auto-coordination");
-  hud_status = PROP("/sim/hud/visibility");
-  panel_status = PROP("/sim/panel/visibility");
-  sound = PROP("/sim/sound");
-  anti_alias_hud = PROP("/sim/hud/antialiased");
-  flight_model = PROP("/sim/flight-model");
-  aircraft = PROP("/sim/aircraft");
-  model_hz = PROP("/sim/model-hz");
-  speed_up = PROP("/sim/speed-up");
-  trim = PROP("/sim/startup/trim");
-  fog = PROP("/sim/rendering/fog");
-  clouds = PROP("/environment/clouds/enabled");
-  clouds_asl = PROP("/environments/clouds/altitude");
-  fullscreen = PROP("/sim/startup/fullscreen");
-  shading = PROP("/sim/rendering/shading");
-  skyblend = PROP("/sim/rendering/skyblend");
-  textures = PROP("/sim/rendering/textures");
-  wireframe = PROP("/sim/rendering/wireframe");
-  xsize = PROP("/sim/startup/xsize");
-  ysize = PROP("/sim/startup/ysize");
-  bpp = PROP("/sim/rendering/bits-per-pixel");
-  view_mode = PROP("/sim/view-mode");
-  default_view_offset = PROP("/sim/startup/view-offset");
-  visibility = PROP("/environment/visibility");
-  units = PROP("/sim/startup/units");
-  tris_or_culled = PROP("/sim/hud/frame-stat-type");
-  time_offset = PROP("/sim/startup/time-offset");
-  time_offset_type = PROP("/sim/startup/time-offset-type");
-  network_olk = PROP("/sim/networking/network-olk");
-  net_id = PROP("/sim/networking/call-sign");
-}
-
-
-/**
- * Set a few fail-safe default property values.
- *
- * These should all be set in $FG_ROOT/preferences.xml, but just
- * in case, we provide some initial sane values here. This method 
- * should be invoked *before* reading any init files.
- */
-void
-FGOptions::set_default_props ()
-{
-  SGPropertyNode * props = globals->get_props();
-
                                // Position (Globe, AZ)
-  props->setDoubleValue("/position/longitude", -110.6642444);
-  props->setDoubleValue("/position/latitude", 33.3528917);
-  props->setDoubleValue("/position/altitude", -9999.0);
+    fgSetDouble("/position/longitude", -110.6642444);
+    fgSetDouble("/position/latitude", 33.3528917);
+    fgSetDouble("/position/altitude", -9999.0);
 
                                // Orientation
-  props->setDoubleValue("/orientation/heading", 270);
-  props->setDoubleValue("/orientation/roll", 0);
-  props->setDoubleValue("/orientation/pitch", 0.424);
+    fgSetDouble("/orientation/heading", 270);
+    fgSetDouble("/orientation/roll", 0);
+    fgSetDouble("/orientation/pitch", 0.424);
 
                                // Velocities
-  props->setStringValue("/sim/startup/speed-set", "knots");
-  props->setDoubleValue("/velocities/uBody", 0.0);
-  props->setDoubleValue("/velocities/vBody", 0.0);
-  props->setDoubleValue("/velocities/wBody", 0.0);
-  props->setDoubleValue("/velocities/speed-north", 0.0);
-  props->setDoubleValue("/velocities/speed-east", 0.0);
-  props->setDoubleValue("/velocities/speed-down", 0.0);
-  props->setDoubleValue("/velocities/airspeed", 0.0);
-  props->setDoubleValue("/velocities/mach", 0.0);
+    fgSetString("/sim/startup/speed-set", "knots");
+    fgSetDouble("/velocities/uBody", 0.0);
+    fgSetDouble("/velocities/vBody", 0.0);
+    fgSetDouble("/velocities/wBody", 0.0);
+    fgSetDouble("/velocities/speed-north", 0.0);
+    fgSetDouble("/velocities/speed-east", 0.0);
+    fgSetDouble("/velocities/speed-down", 0.0);
+    fgSetDouble("/velocities/airspeed", 0.0);
+    fgSetDouble("/velocities/mach", 0.0);
 
                                // Miscellaneous
-  props->setBoolValue("/sim/startup/game-mode", false);
-  props->setBoolValue("/sim/startup/splash-screen", true);
-  props->setBoolValue("/sim/startup/intro-music", true);
-  props->setStringValue("/sim/startup/mouse-pointer", "disabled");
-  props->setStringValue("/sim/control-mode", "joystick");
-  props->setBoolValue("/sim/auto-coordination", false);
+    fgSetBool("/sim/startup/game-mode", false);
+    fgSetBool("/sim/startup/splash-screen", true);
+    fgSetBool("/sim/startup/intro-music", true);
+    fgSetString("/sim/startup/mouse-pointer", "disabled");
+    fgSetString("/sim/control-mode", "joystick");
+    fgSetBool("/sim/auto-coordination", false);
 
                                // Features
-  props->setBoolValue("/sim/hud/visibility", false);
-  props->setBoolValue("/sim/panel/visibility", true);
-  props->setBoolValue("/sim/sound", true);
-  props->setBoolValue("/sim/hud/antialiased", false);
+    fgSetBool("/sim/hud/visibility", false);
+    fgSetBool("/sim/panel/visibility", true);
+    fgSetBool("/sim/sound", true);
+    fgSetBool("/sim/hud/antialiased", false);
 
                                // Flight Model options
-  props->setStringValue("/sim/flight-model", "larcsim");
-  props->setStringValue("/sim/aircraft", "c172");
-  props->setIntValue("/sim/model-hz", NEW_DEFAULT_MODEL_HZ);
-  props->setIntValue("/sim/speed-up", 1);
-  props->setBoolValue("/sim/startup/trim", false);
+    fgSetString("/sim/flight-model", "larcsim");
+    fgSetString("/sim/aircraft", "c172");
+    fgSetInt("/sim/model-hz", NEW_DEFAULT_MODEL_HZ);
+    fgSetInt("/sim/speed-up", 1);
+    fgSetBool("/sim/startup/trim", false);
+    fgSetBool("/sim/startup/onground", true);
 
                                // Rendering options
-  props->setStringValue("/sim/rendering/fog", "nicest");
-  props->setBoolValue("/environment/clouds/enabled", true);
-  props->setDoubleValue("/environment/clouds/altitude", 5000);
-  props->setBoolValue("/sim/startup/fullscreen", false);
-  props->setBoolValue("/sim/rendering/shading", true);
-  props->setBoolValue("/sim/rendering/skyblend", true);
-  props->setBoolValue("/sim/rendering/textures", true);
-  props->setBoolValue("/sim/rendering/wireframe", false);
-  props->setIntValue("/sim/startup/xsize", 800);
-  props->setIntValue("/sim/startup/ysize", 600);
-  props->setIntValue("/sim/rendering/bits-per-pixel", 16);
-  props->setIntValue("/sim/view-mode", (int)FG_VIEW_PILOT);
-  props->setDoubleValue("/sim/startup/view-offset", 0);
-  props->setDoubleValue("/environment/visibility", 20000);
+    fgSetString("/sim/rendering/fog", "nicest");
+    fgSetBool("/environment/clouds/status", true);
+    fgSetDouble("/environment/clouds/altitude", 5000);
+    fgSetBool("/sim/startup/fullscreen", false);
+    fgSetBool("/sim/rendering/shading", true);
+    fgSetBool("/sim/rendering/skyblend", true);
+    fgSetBool("/sim/rendering/textures", true);
+    fgSetBool("/sim/rendering/wireframe", false);
+    fgSetInt("/sim/startup/xsize", 800);
+    fgSetInt("/sim/startup/ysize", 600);
+    fgSetInt("/sim/rendering/bits-per-pixel", 16);
+    fgSetString("/sim/view-mode", "pilot");
+    fgSetDouble("/sim/startup/view-offset", 0);
+    fgSetDouble("/environment/visibility", 20000);
 
                                // HUD options
-  props->setStringValue("/sim/startup/units", "feet");
-  props->setStringValue("/sim/hud/frame-stat-type", "tris");
+    fgSetString("/sim/startup/units", "feet");
+    fgSetString("/sim/hud/frame-stat-type", "tris");
        
                                // Time options
-  props->setIntValue("/sim/startup/time-offset", 0);
+    fgSetInt("/sim/startup/time-offset", 0);
+    fgSetString("/sim/startup/time-offset-type", "system-offset");
 
-  props->setBoolValue("/sim/networking/network-olk", false);
-  props->setStringValue("/sim/networking/call-sign", "Johnny");
+    fgSetBool("/sim/networking/network-olk", false);
+    fgSetString("/sim/networking/call-sign", "Johnny");
 }
 
-void 
-FGOptions::toggle_panel() {
-    SGPropertyNode * props = globals->get_props();
-    bool freeze = globals->get_freeze();
-
-    if( !freeze )
-        globals->set_freeze(true);
-    
-    if(props->getBoolValue("/sim/panel/visibility"))
-        props->setBoolValue("/sim/panel/visibility", false);
-    else
-      props->setBoolValue("/sim/panel/visibility", true);
-
-    fgReshape(props->getIntValue("/sim/startup/xsize"),
-             props->getIntValue("/sim/startup/ysize"));
-
-    if( !freeze )
-        globals->set_freeze( false );
-}
-
-double
-FGOptions::parse_time(const string& time_in) {
+static double
+parse_time(const string& time_in) {
     char *time_str, num[256];
     double hours, minutes, seconds;
     double result = 0.0;
@@ -368,7 +258,8 @@ FGOptions::parse_time(const string& time_in) {
 }
 
 
-long int FGOptions::parse_date( const string& date)
+static long int 
+parse_date( const string& date)
 {
     struct tm gmt;
     char * date_str, num[256];
@@ -476,8 +367,8 @@ long int FGOptions::parse_date( const string& date)
 
 
 /// parse degree in the form of [+/-]hhh:mm:ss
-double
-FGOptions::parse_degree( const string& degree_str) {
+static double
+parse_degree( const string& degree_str) {
     double result = parse_time( degree_str );
 
     // printf("Degree = %.4f\n", result);
@@ -487,8 +378,8 @@ FGOptions::parse_degree( const string& degree_str) {
 
 
 // parse time offset command line option
-int
-FGOptions::parse_time_offset( const string& time_str) {
+static int
+parse_time_offset( const string& time_str) {
     int result;
 
     // printf("time offset = %s\n", time_str);
@@ -505,42 +396,15 @@ FGOptions::parse_time_offset( const string& time_str) {
 }
 
 
-// Parse --fdm=abcdefg type option 
-int
-FGOptions::parse_fdm( const string& fm ) const {
-    // cout << "fdm = " << fm << endl;
-
-    if ( fm == "ada" ) {
-       return FGInterface::FG_ADA;
-    } else if ( fm == "balloon" ) {
-       return FGInterface::FG_BALLOONSIM;
-    } else if ( fm == "external" ) {
-       return FGInterface::FG_EXTERNAL;
-    } else if ( fm == "jsb" ) {
-       return FGInterface::FG_JSBSIM;
-    } else if ( (fm == "larcsim") || (fm == "LaRCsim") ) {
-       return FGInterface::FG_LARCSIM;
-    } else if ( fm == "magic" ) {
-       return FGInterface::FG_MAGICCARPET;
-    } else {
-       FG_LOG( FG_GENERAL, FG_ALERT, "Unknown fdm = " << fm );
-       exit(-1);
-    }
-
-    // we'll never get here, but it makes the compiler happy.
-    return -1;
-}
-
-
 // Parse --fov=x.xx type option 
-double
-FGOptions::parse_fov( const string& arg ) {
+static double
+parse_fov( const string& arg ) {
     double fov = atof(arg);
 
     if ( fov < FG_FOV_MIN ) { fov = FG_FOV_MIN; }
     if ( fov > FG_FOV_MAX ) { fov = FG_FOV_MAX; }
 
-    globals->get_props()->setDoubleValue("/sim/field-of-view", fov);
+    fgSetDouble("/sim/field-of-view", fov);
 
     // printf("parse_fov(): result = %.4f\n", fov);
 
@@ -573,18 +437,19 @@ FGOptions::parse_fov( const string& arg ) {
 // 
 //  filename = file system file name
 
-bool 
-FGOptions::parse_channel( const string& type, const string& channel_str ) {
+static bool 
+parse_channel( const string& type, const string& channel_str ) {
     // cout << "Channel string = " << channel_str << endl;
 
-    globals->get_channel_options_list().push_back( type + "," + channel_str );
+    globals->get_channel_options_list()->push_back( type + "," + channel_str );
 
     return true;
 }
 
 
 // Parse --wp=ID[,alt]
-bool FGOptions::parse_wp( const string& arg ) {
+static bool 
+parse_wp( const string& arg ) {
     string id, alt_str;
     double alt = 0.0;
 
@@ -594,8 +459,7 @@ bool FGOptions::parse_wp( const string& arg ) {
        alt_str = arg.substr( pos + 1 );
        // cout << "id str = " << id << "  alt str = " << alt_str << endl;
        alt = atof( alt_str.c_str() );
-       if ( globals->get_props()->getStringValue("/sim/startup/units")
-            == "feet" ) {
+       if ( fgGetString("/sim/startup/units") == "feet" ) {
            alt *= FEET_TO_METER;
        }
     } else {
@@ -615,7 +479,8 @@ bool FGOptions::parse_wp( const string& arg ) {
 
 
 // Parse --flight-plan=[file]
-bool FGOptions::parse_flightplan(const string& arg)
+static bool 
+parse_flightplan(const string& arg)
 {
     fg_gzifstream infile(arg.c_str());
     if (!infile) {
@@ -641,193 +506,195 @@ bool FGOptions::parse_flightplan(const string& arg)
 
 
 // Parse a single option
-int FGOptions::parse_option( const string& arg ) {
-    SGPropertyNode * props = globals->get_props();
+static int 
+parse_option (const string& arg) 
+{
     // General Options
     if ( (arg == "--help") || (arg == "-h") ) {
        // help/usage request
        return(FG_OPTIONS_HELP);
     } else if ( arg == "--disable-game-mode") {
-       props->setBoolValue("/sim/startup/game-mode", false);
+       fgSetBool("/sim/startup/game-mode", false);
     } else if ( arg == "--enable-game-mode" ) {
-       props->setBoolValue("/sim/startup/game-mode", true);
+       fgSetBool("/sim/startup/game-mode", true);
     } else if ( arg == "--disable-splash-screen" ) {
-       props->setBoolValue("/sim/startup/splash-screen", false); 
+       fgSetBool("/sim/startup/splash-screen", false); 
     } else if ( arg == "--enable-splash-screen" ) {
-        props->setBoolValue("/sim/startup/splash-screen", true);
+        fgSetBool("/sim/startup/splash-screen", true);
     } else if ( arg == "--disable-intro-music" ) {
-       props->setBoolValue("/sim/startup/intro-music", false);
+       fgSetBool("/sim/startup/intro-music", false);
     } else if ( arg == "--enable-intro-music" ) {
-       props->setBoolValue("/sim/startup/intro-music", true);
+       fgSetBool("/sim/startup/intro-music", true);
     } else if ( arg == "--disable-mouse-pointer" ) {
-       props->setStringValue("/sim/startup/mouse-pointer", "disabled");
+       fgSetString("/sim/startup/mouse-pointer", "disabled");
     } else if ( arg == "--enable-mouse-pointer" ) {
-       props->setStringValue("/sim/startup/mouse-pointer", "enabled");
+       fgSetString("/sim/startup/mouse-pointer", "enabled");
     } else if ( arg == "--disable-freeze" ) {
-       props->setBoolValue("/sim/freeze", false);
+        globals->set_freeze(false);
     } else if ( arg == "--enable-freeze" ) {
-       props->setBoolValue("/sim/freeze", true);
+        globals->set_freeze(true);
     } else if ( arg == "--disable-anti-alias-hud" ) {
-       props->setBoolValue("/sim/hud/antialiased", false);
+       fgSetBool("/sim/hud/antialiased", false);
     } else if ( arg == "--enable-anti-alias-hud" ) {
-        props->setBoolValue("/sim/hud/antialiased", true);
+        fgSetBool("/sim/hud/antialiased", true);
     } else if ( arg.find( "--control=") != string::npos ) {
-        props->setStringValue("/sim/control-mode", arg.substr(10));
+        fgSetString("/sim/control-mode", arg.substr(10));
     } else if ( arg == "--disable-auto-coordination" ) {
-        props->setBoolValue("/sim/auto-coordination", false);
+        fgSetBool("/sim/auto-coordination", false);
     } else if ( arg == "--enable-auto-coordination" ) {
-       props->setBoolValue("/sim/auto-coordination", true);
+       fgSetBool("/sim/auto-coordination", true);
     } else if ( arg == "--disable-hud" ) {
-       props->setBoolValue("/sim/hud/visibility", false);
+       fgSetBool("/sim/hud/visibility", false);
     } else if ( arg == "--enable-hud" ) {
-       props->setBoolValue("/sim/hud/visibility", true);
+       fgSetBool("/sim/hud/visibility", true);
     } else if ( arg == "--disable-panel" ) {
-       props->setBoolValue("/sim/panel/visibility", false);
+       fgSetBool("/sim/panel/visibility", false);
     } else if ( arg == "--enable-panel" ) {
-       props->setBoolValue("/sim/panel/visibility", true);
+       fgSetBool("/sim/panel/visibility", true);
     } else if ( arg == "--disable-sound" ) {
-       props->setBoolValue("/sim/sound", false);
+       fgSetBool("/sim/sound", false);
     } else if ( arg == "--enable-sound" ) {
-       props->setBoolValue("/sim/sound", true);
+       fgSetBool("/sim/sound", true);
     } else if ( arg.find( "--airport-id=") != string::npos ) {
                                // NB: changed property name!!!
-       props->setStringValue("/sim/startup/airport-id", arg.substr(13));
+       fgSetString("/sim/startup/airport-id", arg.substr(13));
     } else if ( arg.find( "--lon=" ) != string::npos ) {
-       props->setDoubleValue("/position/longitude",
+       fgSetDouble("/position/longitude",
                              parse_degree(arg.substr(6)));
-       props->setStringValue("/position/airport-id", "");
+       fgSetString("/sim/startup/airport-id", "");
     } else if ( arg.find( "--lat=" ) != string::npos ) {
-       props->setDoubleValue("/position/latitude",
+       fgSetDouble("/position/latitude",
                              parse_degree(arg.substr(6)));
-       props->setStringValue("/position/airport-id", "");
+       fgSetString("/sim/startup/airport-id", "");
     } else if ( arg.find( "--altitude=" ) != string::npos ) {
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-           props->setDoubleValue(atof(arg.substr(11)));
+       fgSetBool("/sim/startup/onground", false);
+       if ( fgGetString("/sim/startup/units") == "feet" )
+           fgSetDouble("/position/altitude", atof(arg.substr(11)));
        else
-           props->setDoubleValue(atof(arg.substr(11)) * METER_TO_FEET);
+           fgSetDouble("/position/altitude",
+                       atof(arg.substr(11)) * METER_TO_FEET);
     } else if ( arg.find( "--uBody=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "UVW");
+        fgSetString("/sim/startup/speed-set", "UVW");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/uBody", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/uBody", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/uBody",
+         fgSetDouble("/velocities/uBody",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--vBody=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "UVW");
+        fgSetString("/sim/startup/speed-set", "UVW");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/vBody", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/vBody", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/vBody",
+         fgSetDouble("/velocities/vBody",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--wBody=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "UVW");
+        fgSetString("/sim/startup/speed-set", "UVW");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/wBody", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/wBody", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/wBody",
+         fgSetDouble("/velocities/wBody",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--vNorth=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "NED");
+        fgSetString("/sim/startup/speed-set", "NED");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/speed-north", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/speed-north", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/speed-north",
+         fgSetDouble("/velocities/speed-north",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--vEast=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "NED");
+        fgSetString("/sim/startup/speed-set", "NED");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/speed-east", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/speed-east", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/speed-east",
+         fgSetDouble("/velocities/speed-east",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--vDown=" ) != string::npos ) {
-        props->setStringValue("/sim/startup/speed-set", "NED");
+        fgSetString("/sim/startup/speed-set", "NED");
                                // FIXME: the units are totally confused here
-       if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/velocities/speed-down", atof(arg.substr(8)));
+       if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/velocities/speed-down", atof(arg.substr(8)));
        else
-         props->setDoubleValue("/velocities/speed-down",
+         fgSetDouble("/velocities/speed-down",
                               atof(arg.substr(8)) * FEET_TO_METER);
     } else if ( arg.find( "--vc=" ) != string::npos) {
-        props->setStringValue("/sim/startup/speed-set", "knots");
-       props->setDoubleValue("/velocities/airspeed", atof(arg.substr(5)));
+        fgSetString("/sim/startup/speed-set", "knots");
+       fgSetDouble("/velocities/airspeed", atof(arg.substr(5)));
     } else if ( arg.find( "--mach=" ) != string::npos) {
-        props->setStringValue("/sim/startup/speed-set", "mach");
-       props->setDoubleValue("/velocities/mach", atof(arg.substr(7)));
+        fgSetString("/sim/startup/speed-set", "mach");
+       fgSetDouble("/velocities/mach", atof(arg.substr(7)));
     } else if ( arg.find( "--heading=" ) != string::npos ) {
-       props->setDoubleValue("/orientation/heading", atof(arg.substr(10)));
+       fgSetDouble("/orientation/heading", atof(arg.substr(10)));
     } else if ( arg.find( "--roll=" ) != string::npos ) {
-       props->setDoubleValue("/orientation/roll", atof(arg.substr(7)));
+       fgSetDouble("/orientation/roll", atof(arg.substr(7)));
     } else if ( arg.find( "--pitch=" ) != string::npos ) {
-       props->setDoubleValue("/orientation/pitch", atof(arg.substr(8)));
+       fgSetDouble("/orientation/pitch", atof(arg.substr(8)));
     } else if ( arg.find( "--fg-root=" ) != string::npos ) {
        globals->set_fg_root(arg.substr( 10 ));
     } else if ( arg.find( "--fg-scenery=" ) != string::npos ) {
         globals->set_fg_scenery(arg.substr( 13 ));
     } else if ( arg.find( "--fdm=" ) != string::npos ) {
-       props->setStringValue("/sim/flight-model", arg.substr(6));
-                               // FIXME: reimplement this logic, somehow
-//     if((flight_model == FGInterface::FG_JSBSIM) && (get_trim_mode() == 0)) {
-//         props->
-//     set_trim_mode(1);
-//     } else {
-//     set_trim_mode(0);
-//     }        
+       fgSetString("/sim/flight-model", arg.substr(6));
     } else if ( arg.find( "--aircraft=" ) != string::npos ) {
-       props->setStringValue("/sim/aircraft", arg.substr(11));
+       fgSetString("/sim/aircraft", arg.substr(11));
     } else if ( arg.find( "--aircraft-dir=" ) != string::npos ) {
-        props->setStringValue("/sim/aircraft-dir", arg.substr(15));
+        fgSetString("/sim/aircraft-dir", arg.substr(15));
     } else if ( arg.find( "--model-hz=" ) != string::npos ) {
-       props->setIntValue("/sim/model-hz", atoi(arg.substr(11)));
+       fgSetInt("/sim/model-hz", atoi(arg.substr(11)));
     } else if ( arg.find( "--speed=" ) != string::npos ) {
-       props->setIntValue("/sim/speed-up", atoi(arg.substr(8)));
+       fgSetInt("/sim/speed-up", atoi(arg.substr(8)));
+    } else if ( arg.find( "--trim") != string::npos) {
+        fgSetBool("/sim/startup/trim", true);
     } else if ( arg.find( "--notrim") != string::npos) {
-        props->setIntValue("/sim/startup/trim", -1);
+        fgSetBool("/sim/startup/trim", false);
+    } else if ( arg.find( "--on-ground") != string::npos) {
+        fgSetBool("/sim/startup/onground", true);
+    } else if ( arg.find( "--in-air") != string::npos) {
+        fgSetBool("/sim/startup/onground", false);
     } else if ( arg == "--fog-disable" ) {
-       props->setStringValue("/sim/rendering/fog", "disabled");
+       fgSetString("/sim/rendering/fog", "disabled");
     } else if ( arg == "--fog-fastest" ) {
-       props->setStringValue("/sim/rendering/fog", "fastest");
+       fgSetString("/sim/rendering/fog", "fastest");
     } else if ( arg == "--fog-nicest" ) {
-       props->setStringValue("/sim/fog", "nicest");
+       fgSetString("/sim/fog", "nicest");
     } else if ( arg == "--disable-clouds" ) {
-        props->setBoolValue("/environment/clouds/enabled", false);
+        fgSetBool("/environment/clouds/status", false);
     } else if ( arg == "--enable-clouds" ) {
-        props->setBoolValue("/environment/clouds/enabled", true);
+        fgSetBool("/environment/clouds/status", true);
     } else if ( arg.find( "--clouds-asl=" ) != string::npos ) {
                                // FIXME: check units
-        if ( props->getStringValue("/sim/startup/units") == "feet" )
-         props->setDoubleValue("/environment/clouds/altitude",
+        if ( fgGetString("/sim/startup/units") == "feet" )
+         fgSetDouble("/environment/clouds/altitude",
                                atof(arg.substr(13)) * FEET_TO_METER);
        else
-         props->setDoubleValue("/environment/clouds/altitude",
+         fgSetDouble("/environment/clouds/altitude",
                                atof(arg.substr(13)));
     } else if ( arg.find( "--fov=" ) != string::npos ) {
        parse_fov( arg.substr(6) );
     } else if ( arg == "--disable-fullscreen" ) {
-        props->setBoolValue("/sim/startup/fullscreen", false);
+        fgSetBool("/sim/startup/fullscreen", false);
     } else if ( arg== "--enable-fullscreen") {
-        props->setBoolValue("/sim/startup/fullscreen", true);
+        fgSetBool("/sim/startup/fullscreen", true);
     } else if ( arg == "--shading-flat") {
-       props->setBoolValue("/sim/rendering/shading", false);
+       fgSetBool("/sim/rendering/shading", false);
     } else if ( arg == "--shading-smooth") {
-       props->setBoolValue("/sim/rendering/shading", true);
+       fgSetBool("/sim/rendering/shading", true);
     } else if ( arg == "--disable-skyblend") {
-       props->setBoolValue("/sim/rendering/skyblend", false);
+       fgSetBool("/sim/rendering/skyblend", false);
     } else if ( arg== "--enable-skyblend" ) {
-       props->setBoolValue("/sim/rendering/skyblend", true);
+       fgSetBool("/sim/rendering/skyblend", true);
     } else if ( arg == "--disable-textures" ) {
-        props->setBoolValue("/sim/rendering/textures", false);
+        fgSetBool("/sim/rendering/textures", false);
     } else if ( arg == "--enable-textures" ) {
-        props->setBoolValue("/sim/rendering/textures", true);
+        fgSetBool("/sim/rendering/textures", true);
     } else if ( arg == "--disable-wireframe" ) {
-        props->setBoolValue("/sim/rendering/wireframe", false);
+        fgSetBool("/sim/rendering/wireframe", false);
     } else if ( arg == "--enable-wireframe" ) {
-        props->setBoolValue("/sim/rendering/wireframe", true);
+        fgSetBool("/sim/rendering/wireframe", true);
     } else if ( arg.find( "--geometry=" ) != string::npos ) {
        bool geometry_ok = true;
        int xsize = 0, ysize = 0;
@@ -854,50 +721,50 @@ int FGOptions::parse_option( const string& arg ) {
        } else {
          FG_LOG( FG_GENERAL, FG_INFO,
                  "Setting geometry to " << xsize << 'x' << ysize << '\n');
-         props->setIntValue("/sim/startup/xsize", xsize);
-         props->setIntValue("/sim/startup/ysize", ysize);
+         fgSetInt("/sim/startup/xsize", xsize);
+         fgSetInt("/sim/startup/ysize", ysize);
        }
     } else if ( arg.find( "--bpp=" ) != string::npos ) {
        string bits_per_pix = arg.substr( 6 );
        if ( bits_per_pix == "16" ) {
-           props->setIntValue("/sim/rendering/bits-per-pixel", 16);
+           fgSetInt("/sim/rendering/bits-per-pixel", 16);
        } else if ( bits_per_pix == "24" ) {
-           props->setIntValue("/sim/rendering/bits-per-pixel", 24);
+           fgSetInt("/sim/rendering/bits-per-pixel", 24);
        } else if ( bits_per_pix == "32" ) {
-           props->setIntValue("/sim/rendering/bits-per-pixel", 32);
+           fgSetInt("/sim/rendering/bits-per-pixel", 32);
        } else {
          FG_LOG(FG_GENERAL, FG_ALERT, "Unsupported bpp " << bits_per_pix);
        }
     } else if ( arg == "--units-feet" ) {
-       props->setStringValue("/sim/startup/units", "feet");
+       fgSetString("/sim/startup/units", "feet");
     } else if ( arg == "--units-meters" ) {
-       props->setStringValue("/sim/startup/units", "meters");
+       fgSetString("/sim/startup/units", "meters");
     } else if ( arg.find( "--time-offset" ) != string::npos ) {
-        props->setIntValue("/sim/startup/time-offset",
+        fgSetInt("/sim/startup/time-offset",
                           parse_time_offset( (arg.substr(14)) ));
     } else if ( arg.find( "--time-match-real") != string::npos ) {
-        props->setStringValue("/sim/startup/time-offset_type",
+        fgSetString("/sim/startup/time-offset_type",
                              "system-offset");
     } else if ( arg.find( "--time-match-local") != string::npos ) {
-        props->setStringValue("/sim/startup/time-offset_type",
+        fgSetString("/sim/startup/time-offset_type",
                              "latitude-offset");
     } else if ( arg.find( "--start-date-sys=") != string::npos ) {
-        props->setIntValue("/sim/startup/time-offset",
+        fgSetInt("/sim/startup/time-offset",
                           parse_date((arg.substr(17))));
-       props->setStringValue("/sim/startup/time-offset-type", "system");
+       fgSetString("/sim/startup/time-offset-type", "system");
     } else if ( arg.find( "--start-date-lat=") != string::npos ) {
-        props->setIntValue("/sim/startup/time-offset",
+        fgSetInt("/sim/startup/time-offset",
                           parse_date((arg.substr(17))));
-       props->setStringValue("/sim/startup/time-offset-type",
+       fgSetString("/sim/startup/time-offset-type",
                           "latitude");
     } else if ( arg.find( "--start-date-gmt=") != string::npos ) {
-        props->setIntValue("/sim/startup/time-offset",
+        fgSetInt("/sim/startup/time-offset",
                           parse_date((arg.substr(17))));
-       props->setStringValue("/sim/startup/time-offset-type", "gmt");
+       fgSetString("/sim/startup/time-offset-type", "gmt");
     } else if ( arg == "--hud-tris" ) {
-        props->setStringValue("/sim/hud/frame-stat-type", "tris");
+        fgSetString("/sim/hud/frame-stat-type", "tris");
     } else if ( arg == "--hud-culled" ) {
-        props->setStringValue("/sim/hud/frame-stat-type", "culled");
+        fgSetString("/sim/hud/frame-stat-type", "culled");
     } else if ( arg.find( "--native=" ) != string::npos ) {
        parse_channel( "native", arg.substr(9) );
     } else if ( arg.find( "--garmin=" ) != string::npos ) {
@@ -916,14 +783,14 @@ int FGOptions::parse_option( const string& arg ) {
        parse_channel( "joyclient", arg.substr(12) );
 #ifdef FG_NETWORK_OLK
     } else if ( arg == "--disable-network-olk" ) {
-        props->setBoolValue("/sim/networking/olk", false);
+        fgSetBool("/sim/networking/olk", false);
     } else if ( arg== "--enable-network-olk") {
-        props->setBoolValue("/sim/networking/olk", true);
+        fgSetBool("/sim/networking/olk", true);
     } else if ( arg == "--net-hud" ) {
-        props->setBoolValue("/sim/hud/net-display", true);
+        fgSetBool("/sim/hud/net-display", true);
        net_hud_display = 1;    // FIXME
     } else if ( arg.find( "--net-id=") != string::npos ) {
-        props->setStringValue("sim/networking/call-sign", arg.substr(9));
+        fgSetString("sim/networking/call-sign", arg.substr(9));
 #endif
     } else if ( arg.find( "--prop:" ) == 0 ) {
         string assign = arg.substr(7);
@@ -934,9 +801,9 @@ int FGOptions::parse_option( const string& arg ) {
        }
        string name = assign.substr(0, pos);
        string value = assign.substr(pos + 1);
-       props->setStringValue(name.c_str(), value);
-       FG_LOG(FG_GENERAL, FG_INFO, "Setting default value of property "
-              << name << " to \"" << value << '"');
+       fgSetString(name.c_str(), value);
+       // FG_LOG(FG_GENERAL, FG_INFO, "Setting default value of property "
+       //        << name << " to \"" << value << '"');
     // $$$ begin - added VS Renganathan, 14 Oct 2K
     // for multi-window outside window imagery
     } else if ( arg.find( "--view-offset=" ) != string::npos ) {
@@ -955,13 +822,13 @@ int FGOptions::parse_option( const string& arg ) {
            (FGViewerRPH *)globals->get_viewmgr()->get_view( 0 );
        pilot_view->set_view_offset( default_view_offset );
        pilot_view->set_goal_view_offset( default_view_offset );
-       props->setDoubleValue("/sim/startup/view-offset", default_view_offset);
+       fgSetDouble("/sim/startup/view-offset", default_view_offset);
     // $$$ end - added VS Renganathan, 14 Oct 2K
     } else if ( arg.find( "--visibility=" ) != string::npos ) {
-       props->setDoubleValue("/environment/visibility", atof(arg.substr(13)));
+       fgSetDouble("/environment/visibility", atof(arg.substr(13)));
     } else if ( arg.find( "--visibility-miles=" ) != string::npos ) {
         double visibility = atof(arg.substr(19)) * 5280.0 * FEET_TO_METER;
-       props->setDoubleValue("/environment/visibility", visibility);
+       fgSetDouble("/environment/visibility", visibility);
     } else if ( arg.find( "--wind=" ) == 0 ) {
         string val = arg.substr(7);
        int pos = val.find('@');
@@ -979,9 +846,9 @@ int FGOptions::parse_option( const string& arg ) {
        if (dir >= 360)
          dir -= 360;
        dir *= DEG_TO_RAD;
-       props->setDoubleValue("/environment/wind-north",
+       fgSetDouble("/environment/wind-north",
                                             speed * cos(dir));
-       props->setDoubleValue("/environment/wind-east",
+       fgSetDouble("/environment/wind-east",
                                             speed * sin(dir));
     } else if ( arg.find( "--wp=" ) != string::npos ) {
        parse_wp( arg.substr( 5 ) );
@@ -998,31 +865,35 @@ int FGOptions::parse_option( const string& arg ) {
 
 // Scan the command line options for an fg_root definition and set
 // just that.
-int FGOptions::scan_command_line_for_root( int argc, char **argv ) {
+string
+fgScanForRoot (int argc, char **argv) 
+{
     int i = 1;
 
-    FG_LOG(FG_GENERAL, FG_INFO, "Processing command line arguments");
+    FG_LOG(FG_GENERAL, FG_INFO, "Scanning for root: command line");
 
     while ( i < argc ) {
        FG_LOG( FG_GENERAL, FG_DEBUG, "argv[" << i << "] = " << argv[i] );
 
        string arg = argv[i];
        if ( arg.find( "--fg-root=" ) != string::npos ) {
-           globals->set_fg_root(arg.substr( 10 ));
+           return arg.substr( 10 );
        }
 
        i++;
     }
-    
-    return FG_OPTIONS_OK;
+
+    return "";
 }
 
 
 // Scan the config file for an fg_root definition and set just that.
-int FGOptions::scan_config_file_for_root( const string& path ) {
+string
+fgScanForRoot (const string& path)
+{
     fg_gzifstream in( path );
     if ( !in.is_open() )
-       return(FG_OPTIONS_ERROR);
+      return "";
 
     FG_LOG( FG_GENERAL, FG_INFO, "Scanning for root: " << path );
 
@@ -1045,18 +916,19 @@ int FGOptions::scan_config_file_for_root( const string& path ) {
 #endif
 
        if ( line.find( "--fg-root=" ) != string::npos ) {
-           globals->set_fg_root(line.substr( 10 ));
+           return line.substr( 10 );
        }
 
        in >> skipcomment;
     }
 
-    return FG_OPTIONS_OK;
+    return "";
 }
 
 
 // Parse the command line options
-int FGOptions::parse_command_line( int argc, char **argv ) {
+void
+fgParseOptions (int argc, char **argv) {
     int i = 1;
     int result;
 
@@ -1067,21 +939,21 @@ int FGOptions::parse_command_line( int argc, char **argv ) {
 
        result = parse_option(argv[i]);
        if ( (result == FG_OPTIONS_HELP) || (result == FG_OPTIONS_ERROR) ) {
-           return(result);
+           fgUsage();
+           exit(-1);
        }
 
        i++;
     }
-    
-    return FG_OPTIONS_OK;
 }
 
 
 // Parse config file options
-int FGOptions::parse_config_file( const string& path ) {
+void
+fgParseOptions (const string& path) {
     fg_gzifstream in( path );
     if ( !in.is_open() )
-       return(FG_OPTIONS_ERROR);
+      return;
 
     FG_LOG( FG_GENERAL, FG_INFO, "Processing config file: " << path );
 
@@ -1107,17 +979,18 @@ int FGOptions::parse_config_file( const string& path ) {
            FG_LOG( FG_GENERAL, FG_ALERT, 
                    "Config file parse error: " << path << " '" 
                    << line << "'" );
+           fgUsage();
            exit(-1);
        }
        in >> skipcomment;
     }
-
-    return FG_OPTIONS_OK;
 }
 
 
 // Print usage message
-void FGOptions::usage ( void ) {
+void 
+fgUsage ()
+{
     cout << "Usage: fg [ options ... ]" << endl;
     cout << endl;
 
@@ -1164,6 +1037,9 @@ void FGOptions::usage ( void ) {
         << endl;
     cout << "\t--speed=n:  run the FDM this much faster than real time" << endl;
     cout << "\t--notrim:  Do NOT attempt to trim the model when initializing JSBsim" << endl;
+    cout << "\t--on-ground:  Start up at ground level (default)" << endl;
+    cout << "\t--in-air:  Start up in air (implied by specifying an initial"
+        << " altitude above ground level." << endl;
     cout << "\t--wind=DIR@SPEED: specify wind coming from DIR (degrees) at SPEED (knots)" << endl;
     cout << endl;
 
@@ -1269,31 +1145,3 @@ void FGOptions::usage ( void ) {
     cout << "\t\tinstances of --wp=" << endl;
     cout << "\t--flight-plan=[file]: Read all waypoints from [file]" <<endl;
 }
-
-
-// Destructor
-FGOptions::~FGOptions( void ) {
-}
-
-
-//
-// Temporary methods...
-//
-
-string
-FGOptions::get_fg_root() const
-{
-  return globals->get_fg_root();
-}
-
-string
-FGOptions::get_fg_scenery () const
-{
-  return globals->get_fg_scenery();
-}
-
-string_list
-FGOptions::get_channel_options_list () const
-{
-  return globals->get_channel_options_list();
-}