]> git.mxchange.org Git - flightgear.git/blobdiff - src/FDM/JSBSim/FGFDMExec.cpp
Latest JSBSim changes, including some gear tweaking from Jon and some
[flightgear.git] / src / FDM / JSBSim / FGFDMExec.cpp
index d98f24038b1944d497c920a5a37587d90765d8b0..fdf6eaf2cd7acbdb7072440e04626ad78275cf6a 100644 (file)
@@ -4,7 +4,6 @@
  Author:       Jon S. Berndt
  Date started: 11/17/98
  Purpose:      Schedules and runs the model routines.
- Called by:    The GUI.
 
  ------------- Copyright (C) 1999  Jon S. Berndt (jsb@hal-pc.org) -------------
 
@@ -44,18 +43,14 @@ INCLUDES
 
 #ifdef FGFS
 #  include <simgear/compiler.h>
-#  ifdef FG_HAVE_STD_INCLUDES
-#    include <iostream>
-#    include <ctime>
-#    include <iterator>
-#  else
+#  include STL_IOSTREAM
+#  include STL_ITERATOR
+#else
+#  if defined(sgi) && !defined(__GNUC__)
 #    include <iostream.h>
-#    include <time.h>
-#    include <iterator.h>
+#  else
+#    include <iostream>
 #  endif
-#else
-#  include <iostream>
-#  include <ctime>
 #  include <iterator>
 #endif
 
@@ -64,6 +59,10 @@ INCLUDES
 #include "FGAtmosphere.h"
 #include "FGFCS.h"
 #include "FGPropulsion.h"
+#include "FGMassBalance.h"
+#include "FGGroundReactions.h"
+#include "FGAerodynamics.h"
+#include "FGInertial.h"
 #include "FGAircraft.h"
 #include "FGTranslation.h"
 #include "FGRotation.h"
@@ -71,43 +70,16 @@ INCLUDES
 #include "FGAuxiliary.h"
 #include "FGOutput.h"
 #include "FGConfigFile.h"
+#include "FGInitialCondition.h"
 
 static const char *IdSrc = "$Id$";
-static const char *IdHdr = "ID_FDMEXEC";
-
-char highint[5]  = {27, '[', '1', 'm', '\0'      };
-char halfint[5]  = {27, '[', '2', 'm', '\0'      };
-char normint[6]  = {27, '[', '2', '2', 'm', '\0' };
-char reset[5]    = {27, '[', '0', 'm', '\0'      };
-char underon[5]  = {27, '[', '4', 'm', '\0'      };
-char underoff[6] = {27, '[', '2', '4', 'm', '\0' };
-char fgblue[6]   = {27, '[', '3', '4', 'm', '\0' };
-char fgcyan[6]   = {27, '[', '3', '6', 'm', '\0' };
-char fgred[6]    = {27, '[', '3', '1', 'm', '\0' };
-char fggreen[6]  = {27, '[', '3', '2', 'm', '\0' };
-char fgdef[6]    = {27, '[', '3', '9', 'm', '\0' };
+static const char *IdHdr = ID_FDMEXEC;
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 GLOBAL DECLARATIONS
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
-short debug_lvl;  // This describes to any interested entity the debug level
-                  // requested by setting the JSBSIM_DEBUG environment variable.
-                  // The bitmasked value choices are as follows:
-                  // a) unset: In this case (the default) JSBSim would only print
-                  //    out the normally expected messages, essentially echoing
-                  //    the config files as they are read. If the environment
-                  //    variable is not set, debug_lvl is set to 1 internally
-                  // b) 0: This requests JSBSim not to output any messages
-                  //    whatsoever.
-                  // c) 1: This value explicity requests the normal JSBSim
-                  //    startup messages
-                  // d) 2: This value asks for a message to be printed out when
-                  //    a class is instantiated
-                  // e) 4: When this value is set, a message is displayed when a
-                  //    FGModel object executes its Run() method
-                  // f) 8: When this value is set, various runtime state variables
-                  //    are printed out periodically
+unsigned int FGFDMExec::FDMctr = 0;
 
 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 CLASS IMPLEMENTATION
@@ -117,28 +89,30 @@ CLASS IMPLEMENTATION
 
 FGFDMExec::FGFDMExec(void)
 {
-  FirstModel  = 0;
-  Error       = 0;
-  State       = 0;
-  Atmosphere  = 0;
-  FCS         = 0;
-  Propulsion  = 0;
-  Aircraft    = 0;
-  Translation = 0;
-  Rotation    = 0;
-  Position    = 0;
-  Auxiliary   = 0;
-  Output      = 0;
+  Frame           = 0;
+  FirstModel      = 0;
+  Error           = 0;
+  State           = 0;
+  Atmosphere      = 0;
+  FCS             = 0;
+  Propulsion      = 0;
+  MassBalance     = 0;
+  Aerodynamics    = 0;
+  Inertial        = 0;
+  GroundReactions = 0;
+  Aircraft        = 0;
+  Translation     = 0;
+  Rotation        = 0;
+  Position        = 0;
+  Auxiliary       = 0;
+  Output          = 0;
 
   terminate = false;
   frozen = false;
   modelLoaded = false;
-  Scripted = false;
 
-  cout << "\n\n     " << highint << underon << "JSBSim Flight Dynamics Model v"
-                                 << JSBSIM_VERSION << underoff << normint << endl;
-  cout << halfint << "            [cfg file spec v" << NEEDED_CFG_VERSION << "]\n\n";
-  cout << normint << "JSBSim startup beginning ...\n\n";
+  IdFDM = FDMctr;
+  FDMctr++;
 
   try {
     char* num = getenv("JSBSIM_DEBUG");
@@ -148,36 +122,44 @@ FGFDMExec::FGFDMExec(void)
     debug_lvl = 1;
   }
 
-  if (debug_lvl & 2) cout << "Instantiated: FGFDMExec" << endl;
+  Debug(0);
 
   Allocate();
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-FGFDMExec::~FGFDMExec() {
+FGFDMExec::~FGFDMExec()
+{
   DeAllocate();
-  if (debug_lvl & 2) cout << "Destroyed:    FGFDMExec" << endl;
+
+  Debug(1);
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-bool FGFDMExec::Allocate(void) {
-
+bool FGFDMExec::Allocate(void)
+{
   bool result=true;
 
-  Atmosphere  = new FGAtmosphere(this);
-  FCS         = new FGFCS(this);
-  Propulsion  = new FGPropulsion(this);
-  Aircraft    = new FGAircraft(this);
-  Translation = new FGTranslation(this);
-  Rotation    = new FGRotation(this);
-  Position    = new FGPosition(this);
-  Auxiliary   = new FGAuxiliary(this);
-  Output      = new FGOutput(this);
-
-  State       = new FGState(this);
-
+  Atmosphere      = new FGAtmosphere(this);
+  FCS             = new FGFCS(this);
+  Propulsion      = new FGPropulsion(this);
+  MassBalance     = new FGMassBalance(this);
+  Aerodynamics    = new FGAerodynamics (this);
+  Inertial        = new FGInertial(this);
+  GroundReactions = new FGGroundReactions(this);
+  Aircraft        = new FGAircraft(this);
+  Translation     = new FGTranslation(this);
+  Rotation        = new FGRotation(this);
+  Position        = new FGPosition(this);
+  Auxiliary       = new FGAuxiliary(this);
+  Output          = new FGOutput(this);
+
+  State        = new FGState(this); // This must be done here, as the FGState
+                                    // class needs valid pointers to the above
+                                    // model classes
+  
   // Initialize models so they can communicate with each other
 
   if (!Atmosphere->InitModel()) {
@@ -189,24 +171,36 @@ bool FGFDMExec::Allocate(void) {
   if (!Propulsion->InitModel()) {
     cerr << fgred << "FGPropulsion model init failed" << fgdef << endl;
     Error+=4;}
+  if (!MassBalance->InitModel()) {
+    cerr << fgred << "FGMassBalance model init failed" << fgdef << endl;
+    Error+=8;}
+  if (!Aerodynamics->InitModel()) {
+    cerr << fgred << "FGAerodynamics model init failed" << fgdef << endl;
+    Error+=16;}
+  if (!Inertial->InitModel()) {
+    cerr << fgred << "FGInertial model init failed" << fgdef << endl;
+    Error+=32;}
+  if (!GroundReactions->InitModel())   {
+    cerr << fgred << "Ground Reactions model init failed" << fgdef << endl;
+    Error+=64;}
   if (!Aircraft->InitModel())   {
     cerr << fgred << "Aircraft model init failed" << fgdef << endl;
-    Error+=8;}
+    Error+=128;}
   if (!Translation->InitModel()){
     cerr << fgred << "Translation model init failed" << fgdef << endl;
-    Error+=16;}
+    Error+=256;}
   if (!Rotation->InitModel())   {
     cerr << fgred << "Rotation model init failed" << fgdef << endl;
-    Error+=32;}
+    Error+=512;}
   if (!Position->InitModel())   {
     cerr << fgred << "Position model init failed" << fgdef << endl;
-    Error+=64;}
+    Error+=1024;}
   if (!Auxiliary->InitModel())  {
     cerr << fgred << "Auxiliary model init failed" << fgdef << endl;
-    Error+=128;}
+    Error+=2058;}
   if (!Output->InitModel())     {
     cerr << fgred << "Output model init failed" << fgdef << endl;
-    Error+=256;}
+    Error+=4096;}
 
   if (Error > 0) result = false;
 
@@ -214,15 +208,19 @@ bool FGFDMExec::Allocate(void) {
   // instance, the atmosphere model gets executed every fifth pass it is called
   // by the executive. Everything else here gets executed each pass.
 
-  Schedule(Atmosphere,  1);
-  Schedule(FCS,         1);
-  Schedule(Propulsion,  1);
-  Schedule(Aircraft,    1);
-  Schedule(Rotation,    1);
-  Schedule(Translation, 1);
-  Schedule(Position,    1);
-  Schedule(Auxiliary,   1);
-  Schedule(Output,     1);
+  Schedule(Atmosphere,      1);
+  Schedule(FCS,             1);
+  Schedule(Propulsion,      1);
+  Schedule(MassBalance,     1);
+  Schedule(Aerodynamics,    1);
+  Schedule(Inertial,        1);
+  Schedule(GroundReactions, 1);
+  Schedule(Aircraft,        1);
+  Schedule(Rotation,        1);
+  Schedule(Translation,     1);
+  Schedule(Position,        1);
+  Schedule(Auxiliary,       1);
+  Schedule(Output,          1);
 
   modelLoaded = false;
 
@@ -233,30 +231,38 @@ bool FGFDMExec::Allocate(void) {
 
 bool FGFDMExec::DeAllocate(void) {
 
-  if ( Atmosphere != 0 )  delete Atmosphere;
-  if ( FCS != 0 )         delete FCS;
-  if ( Propulsion != 0)   delete Propulsion;
-  if ( Aircraft != 0 )    delete Aircraft;
-  if ( Translation != 0 ) delete Translation;
-  if ( Rotation != 0 )    delete Rotation;
-  if ( Position != 0 )    delete Position;
-  if ( Auxiliary != 0 )   delete Auxiliary;
-  if ( Output != 0 )      delete Output;
-  if ( State != 0 )       delete State;
+  if ( Atmosphere != 0 )     delete Atmosphere;
+  if ( FCS != 0 )            delete FCS;
+  if ( Propulsion != 0)      delete Propulsion;
+  if ( MassBalance != 0)     delete MassBalance;
+  if ( Aerodynamics != 0)    delete Aerodynamics;
+  if ( Inertial != 0)        delete Inertial;
+  if ( GroundReactions != 0) delete GroundReactions;
+  if ( Aircraft != 0 )       delete Aircraft;
+  if ( Translation != 0 )    delete Translation;
+  if ( Rotation != 0 )       delete Rotation;
+  if ( Position != 0 )       delete Position;
+  if ( Auxiliary != 0 )      delete Auxiliary;
+  if ( Output != 0 )         delete Output;
+  if ( State != 0 )          delete State;
 
   FirstModel  = 0L;
   Error       = 0;
 
-  State       = 0;
-  Atmosphere  = 0;
-  FCS         = 0;
-  Propulsion  = 0;
-  Aircraft    = 0;
-  Translation = 0;
-  Rotation    = 0;
-  Position    = 0;
-  Auxiliary   = 0;
-  Output      = 0;
+  State           = 0;
+  Atmosphere      = 0;
+  FCS             = 0;
+  Propulsion      = 0;
+  MassBalance     = 0;
+  Aerodynamics    = 0;
+  Inertial        = 0;
+  GroundReactions = 0;
+  Aircraft        = 0;
+  Translation     = 0;
+  Rotation        = 0;
+  Position        = 0;
+  Auxiliary       = 0;
+  Output          = 0;
 
   modelLoaded = false;
   return modelLoaded;
@@ -285,6 +291,7 @@ int FGFDMExec::Schedule(FGModel* model, int rate)
     model_iterator->NextModel->SetRate(rate);
 
   }
+  
   return 0;
 }
 
@@ -299,18 +306,14 @@ bool FGFDMExec::Run(void)
   model_iterator = FirstModel;
   if (model_iterator == 0L) return false;
 
-  if (Scripted) {                                              
-    RunScript();
-    if (State->Getsim_time() >= EndTime) return false;
-  }
-
-  if (debug_lvl & 4) cout << "=========================" << endl;
+  Debug(2);
 
   while (!model_iterator->Run()) {
     model_iterator = model_iterator->NextModel;
     if (model_iterator == 0L) break;
   }
 
+  frame = Frame++;
   State->IncrTime();
 
   return true;
@@ -331,300 +334,212 @@ bool FGFDMExec::RunIC(FGInitialCondition *fgic)
 
 bool FGFDMExec::LoadModel(string APath, string EPath, string model)
 {
-  bool result = false;
-  
+  bool result = true;
+  string token;
+  string aircraftCfgFileName;
+
+  AircraftPath = APath;
+  EnginePath   = EPath;
+
+# ifndef macintosh
+  aircraftCfgFileName = AircraftPath + "/" + model + "/" + model + ".xml";
+# else
+  aircraftCfgFileName = AircraftPath + ";" + model + ";" + model + ".xml";
+# endif
+
+  FGConfigFile AC_cfg(aircraftCfgFileName);
+  if (!AC_cfg.IsOpen()) return false;
+
   if (modelLoaded) {
     DeAllocate();
     Allocate();
   }
-  
-  AircraftPath = APath;
-  EnginePath   = EPath;
-  result = Aircraft->LoadAircraft(AircraftPath, EnginePath, model);
+
+  if (!ReadPrologue(&AC_cfg)) return false;
+
+  while ((AC_cfg.GetNextConfigLine() != string("EOF")) &&
+         (token = AC_cfg.GetValue()) != string("/FDM_CONFIG")) {
+    if (token == "METRICS") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Metrics" << fgdef << endl;
+      if (!ReadMetrics(&AC_cfg)) result = false;
+    } else if (token == "AERODYNAMICS") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Aerodynamics" << fgdef << endl;
+      if (!ReadAerodynamics(&AC_cfg)) result = false;
+    } else if (token == "UNDERCARRIAGE") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Landing Gear" << fgdef << endl;
+      if (!ReadUndercarriage(&AC_cfg)) result = false;
+    } else if (token == "PROPULSION") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Propulsion" << fgdef << endl;
+      if (!ReadPropulsion(&AC_cfg)) result = false;
+    } else if (token == "FLIGHT_CONTROL") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Flight Control" << fgdef << endl;
+      if (!ReadFlightControls(&AC_cfg)) result = false;
+    } else if (token == "OUTPUT") {
+      if (debug_lvl > 0) cout << fgcyan << "\n  Reading Output directives" << fgdef << endl;
+      if (!ReadOutput(&AC_cfg)) result = false;
+    }
+  }
 
   if (result) {
     modelLoaded = true;
+    Debug(3);
   } else {
     cerr << fgred
-         << "FGFDMExec: Failed to load aircraft and/or engine model"
+         << "  FGFDMExec: Failed to load aircraft and/or engine model"
          << fgdef << endl;
   }
 
-  cout << "\n\nJSBSim startup complete\n\n";
   return result;
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-bool FGFDMExec::LoadScript(string script)
+bool FGFDMExec::ReadPrologue(FGConfigFile* AC_cfg)
 {
-  FGConfigFile Script(script);
-  string token="";
-  string aircraft="";
-  string initialize="";
-  bool result=false;
-  float dt=0.0;
-  struct condition *newCondition;
-
-  if (!Script.IsOpen()) return false;
-
-  Script.GetNextConfigLine();
-  ScriptName = Script.GetValue("name");
-  Scripted = true;
-  cout << "Reading Script File " << ScriptName << endl;
-
-  while (Script.GetNextConfigLine() != "EOF" && Script.GetValue() != "/runscript") {
-    token = Script.GetValue();
-    if (token == "use") {
-      if ((token = Script.GetValue("aircraft")) != "") {
-        aircraft = token;
-        cout << "  Use aircraft: " << token << endl;
-      } else if ((token = Script.GetValue("initialize")) != "") {
-        initialize = token;
-        cout << "  Use reset file: " << token << endl;
-      } else {
-        cerr << "Unknown 'use' keyword: \"" << token << "\"" << endl;
-      }
-    } else if (token == "run") {
-      StartTime = strtod(Script.GetValue("start").c_str(), NULL);
-      State->Setsim_time(StartTime);
-      EndTime   = strtod(Script.GetValue("end").c_str(), NULL);
-      dt        = strtod(Script.GetValue("dt").c_str(), NULL);
-      State->Setdt(dt);
-      Script.GetNextConfigLine();
-      token = Script.GetValue();
-      while (token != "/run") {
-
-        if (token == "when") {
-          Script.GetNextConfigLine();
-          token = Script.GetValue();
-          newCondition = new struct condition();
-          while (token != "/when") {
-            if (token == "parameter") {
-              newCondition->TestParam.push_back(State->GetParameterIndex(Script.GetValue("name")));
-              newCondition->TestValue.push_back(strtod(Script.GetValue("value").c_str(), NULL));
-              newCondition->Comparison.push_back(Script.GetValue("comparison"));
-            } else if (token == "set") {
-              newCondition->SetParam.push_back(State->GetParameterIndex(Script.GetValue("name")));
-              newCondition->SetValue.push_back(strtod(Script.GetValue("value").c_str(), NULL));
-              newCondition->Triggered.push_back(false);
-              newCondition->OriginalValue.push_back(0.0);
-              newCondition->newValue.push_back(0.0);
-              newCondition->StartTime.push_back(0.0);
-              newCondition->EndTime.push_back(0.0);
-              string tempCompare = Script.GetValue("type");
-              if      (tempCompare == "FG_DELTA") newCondition->Type.push_back(FG_DELTA);
-              else if (tempCompare == "FG_BOOL")  newCondition->Type.push_back(FG_BOOL);
-              else if (tempCompare == "FG_VALUE") newCondition->Type.push_back(FG_VALUE);
-              else                                newCondition->Type.push_back((eType)0);
-              tempCompare = Script.GetValue("action");
-              if      (tempCompare == "FG_RAMP") newCondition->Action.push_back(FG_RAMP);
-              else if (tempCompare == "FG_STEP") newCondition->Action.push_back(FG_STEP);
-              else if (tempCompare == "FG_EXP")  newCondition->Action.push_back(FG_EXP);
-              else                               newCondition->Action.push_back((eAction)0);
-              
-              if (Script.GetValue("persistent") == "true")
-                newCondition->Persistent.push_back(true);
-              else
-                newCondition->Persistent.push_back(false);
-               
-              newCondition->TC.push_back(strtod(Script.GetValue("tc").c_str(), NULL));
-             
-            } else {
-              cerr << "Unrecognized keyword in script file: \" [when] " << token << "\"" << endl;
-            }
-            Script.GetNextConfigLine();
-            token = Script.GetValue();
-          }
-          Conditions.push_back(*newCondition);
-          Script.GetNextConfigLine();
-          token = Script.GetValue();
-
-        } else {
-          cerr << "Error reading script file: expected \"when\", got \"" << token << "\"" << endl;
-        }
-
-      }
-    } else {
-      cerr << "Unrecognized keyword in script file: \"" << token << "\" [runscript] " << endl;
-    }
+  string token = AC_cfg->GetValue();
+  string scratch;
+  string AircraftName;
+  
+  AircraftName = AC_cfg->GetValue("NAME");
+  Aircraft->SetAircraftName(AircraftName);
+
+  if (debug_lvl > 0) cout << underon << "Reading Aircraft Configuration File"
+            << underoff << ": " << highint << AircraftName << normint << endl;
+  scratch = AC_cfg->GetValue("VERSION").c_str();
+
+  CFGVersion = AC_cfg->GetValue("VERSION");
+
+  if (debug_lvl > 0)
+    cout << "                            Version: " << highint << CFGVersion
+                                                             << normint << endl;
+  if (CFGVersion != needed_cfg_version) {
+    cerr << endl << fgred << "YOU HAVE AN INCOMPATIBLE CFG FILE FOR THIS AIRCRAFT."
+            " RESULTS WILL BE UNPREDICTABLE !!" << endl;
+    cerr << "Current version needed is: " << needed_cfg_version << endl;
+    cerr << "         You have version: " << CFGVersion << endl << fgdef << endl;
+    return false;
   }
+  return true;
+}
 
-  if (aircraft == "") {
-    cerr << "Aircraft file not loaded in script" << endl;
-    exit(-1);
-  }
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-  // print out conditions for double-checking
+bool FGFDMExec::ReadPropulsion(FGConfigFile* AC_cfg)
+{
+  if (!Propulsion->Load(AC_cfg)) {
+    cerr << "  Propulsion not successfully loaded" << endl;
+    return false;
+  }
+  return true;
+}
 
-  vector <struct condition>::iterator iterConditions = Conditions.begin();
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-  int count=0;
+bool FGFDMExec::ReadFlightControls(FGConfigFile* AC_cfg)
+{
+  if (!FCS->Load(AC_cfg)) {
+    cerr << "  Flight Controls not successfully loaded" << endl;
+    return false;
+  }
+  return true;
+}
 
-  cout << "\n  Script goes from " << StartTime << " to " << EndTime
-       << " with dt = " << dt << endl << endl;
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-  while (iterConditions < Conditions.end()) {
-    cout << "  Condition: " << count++ << endl;
-    cout << "    if (";
+bool FGFDMExec::ReadAerodynamics(FGConfigFile* AC_cfg)
+{
+  if (!Aerodynamics->Load(AC_cfg)) {
+    cerr << "  Aerodynamics not successfully loaded" << endl;
+    return false;
+  }
+  return true;
+}
 
-    for (int i=0; i<iterConditions->TestValue.size(); i++) {
-      if (i>0) cout << " and" << endl << "        ";
-      cout << "(" << State->paramdef[iterConditions->TestParam[i]]
-                  << iterConditions->Comparison[i] << " "
-                  << iterConditions->TestValue[i] << ")";
-    }
-    cout << ") then {" << endl;
-
-    for (int i=0; i<iterConditions->SetValue.size(); i++) {
-      cout << "      set" << State->paramdef[iterConditions->SetParam[i]]
-           << "to " << iterConditions->SetValue[i];
-
-      switch (iterConditions->Type[i]) {
-      case FG_VALUE:
-        cout << " (constant";
-        break;
-      case FG_DELTA:
-        cout << " (delta";
-        break;
-      case FG_BOOL:
-        cout << " (boolean";
-        break;
-      default:
-        cout << " (unspecified type";
-      }
-
-      switch (iterConditions->Action[i]) {
-      case FG_RAMP:
-        cout << " via ramp";
-        break;
-      case FG_STEP:
-        cout << " via step";
-        break;
-      case FG_EXP:
-        cout << " via exponential approach";
-        break;
-      default:
-        cout << " via unspecified action";
-      }
-
-      if (!iterConditions->Persistent[i]) cout << endl
-                         << "                              once";
-      else cout << endl
-                         << "                              repeatedly";
-
-      if (iterConditions->Action[i] == FG_RAMP ||
-          iterConditions->Action[i] == FG_EXP) cout << endl
-                         << "                              with time constant "
-                         << iterConditions->TC[i];
-    }
-    cout << ")" << endl << "    }" << endl << endl;
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-    iterConditions++;
+bool FGFDMExec::ReadUndercarriage(FGConfigFile* AC_cfg)
+{
+  if (!GroundReactions->Load(AC_cfg)) {
+    cerr << "  Ground Reactions not successfully loaded" << endl;
+    return false;
   }
+  return true;
+}
 
-  cout << endl;
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-  result = LoadModel("aircraft", "engine", aircraft);
-  if (!result) {
-    cerr << "Aircraft file " << aircraft << " was not found" << endl;
-         exit(-1);
+bool FGFDMExec::ReadMetrics(FGConfigFile* AC_cfg)
+{
+  if (!Aircraft->Load(AC_cfg)) {
+    cerr << "  Aircraft metrics not successfully loaded" << endl;
+    return false;
   }
-  if ( ! State->Reset("aircraft", aircraft, initialize))
-                 State->Initialize(2000,0,0,0,0,0,0.5,0.5,40000);
-
   return true;
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-void FGFDMExec::RunScript(void)
+bool FGFDMExec::ReadOutput(FGConfigFile* AC_cfg)
 {
-  vector <struct condition>::iterator iC = Conditions.begin();
-  bool truth;
-  bool WholeTruth;
-
-  int count=0;
-
-  float currentTime = State->Getsim_time();
-  float newSetValue;
-
-  while (iC < Conditions.end()) {
-    // determine whether the set of conditional tests for this condition equate
-    // to true
-    for (int i=0; i<iC->TestValue.size(); i++) {
-           if (iC->Comparison[i] == "lt")
-              truth = State->GetParameter(iC->TestParam[i]) <  iC->TestValue[i];
-      else if (iC->Comparison[i] == "le")
-              truth = State->GetParameter(iC->TestParam[i]) <= iC->TestValue[i];
-      else if (iC->Comparison[i] == "eq")
-              truth = State->GetParameter(iC->TestParam[i]) == iC->TestValue[i];
-      else if (iC->Comparison[i] == "ge")
-              truth = State->GetParameter(iC->TestParam[i]) >= iC->TestValue[i];
-      else if (iC->Comparison[i] == "gt")
-              truth = State->GetParameter(iC->TestParam[i]) >  iC->TestValue[i];
-      else if (iC->Comparison[i] == "ne")
-              truth = State->GetParameter(iC->TestParam[i]) != iC->TestValue[i];
-      else
-              cerr << "Bad comparison" << endl;
-
-      if (i == 0) WholeTruth = truth;
-      else        WholeTruth = WholeTruth && truth;
-
-      if (!truth && iC->Persistent[i] && iC->Triggered[i]) iC->Triggered[i] = false;
-    }
-
-    // if the conditions are true, do the setting of the desired parameters
-
-    if (WholeTruth) {
-      for (int i=0; i<iC->SetValue.size(); i++) {
-        if ( ! iC->Triggered[i]) {
-          iC->OriginalValue[i] = State->GetParameter(iC->SetParam[i]);
-          switch (iC->Type[i]) {
-          case FG_VALUE:
-            iC->newValue[i] = iC->SetValue[i];
-            break;
-          case FG_DELTA:
-            iC->newValue[i] = iC->OriginalValue[i] + iC->SetValue[i];
-            break;
-          case FG_BOOL:
-            break;
-          default:
-            cerr << "Invalid Type specified" << endl;
-            break;
-          }
-          iC->Triggered[i] = true;
-          iC->StartTime[i] = currentTime;
-        }
-
-        switch (iC->Action[i]) {
-        case FG_RAMP:
-          newSetValue = (currentTime - iC->StartTime[i])/(iC->TC[i])
-                      * (iC->newValue[i] - iC->OriginalValue[i]) + iC->OriginalValue[i];
-          if (newSetValue > iC->newValue[i]) newSetValue = iC->newValue[i];
-          break;
-        case FG_STEP:
-          newSetValue = iC->newValue[i];
-          break;
-        case FG_EXP:
-          newSetValue = (1 - exp(-(currentTime - iC->StartTime[i])/(iC->TC[i])))
-              * (iC->newValue[i] - iC->OriginalValue[i]) + iC->OriginalValue[i];
-          break;
-        default:
-          cerr << "Invalid Action specified" << endl;
-          break;
-        }
-        State->SetParameter(iC->SetParam[i], newSetValue);
-      }
-    }
-    iC++;
+  if (!Output->Load(AC_cfg)) {
+    cerr << "  Output not successfully loaded" << endl;
+    return false;
   }
+  return true;
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-void FGFDMExec::Debug(void)
+//    The bitmasked value choices are as follows:
+//    unset: In this case (the default) JSBSim would only print
+//       out the normally expected messages, essentially echoing
+//       the config files as they are read. If the environment
+//       variable is not set, debug_lvl is set to 1 internally
+//    0: This requests JSBSim not to output any messages
+//       whatsoever.
+//    1: This value explicity requests the normal JSBSim
+//       startup messages
+//    2: This value asks for a message to be printed out when
+//       a class is instantiated
+//    4: When this value is set, a message is displayed when a
+//       FGModel object executes its Run() method
+//    8: When this value is set, various runtime state variables
+//       are printed out periodically
+//    16: When set various parameters are sanity checked and
+//       a message is printed out when they go out of bounds
+
+void FGFDMExec::Debug(int from)
 {
-    //TODO: Add your source code here
+  if (debug_lvl <= 0) return;
+
+  if (debug_lvl & 1) { // Standard console startup message output
+    if (from == 0) { // Constructor
+      cout << "\n\n     " << highint << underon << "JSBSim Flight Dynamics Model v"
+                                     << JSBSim_version << underoff << normint << endl;
+      cout << halfint << "            [cfg file spec v" << needed_cfg_version << "]\n\n";
+      cout << normint << "JSBSim startup beginning ...\n\n";
+    } else if (from == 3) {
+      cout << "\n\nJSBSim startup complete\n\n";
+    }
+  }
+  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
+    if (from == 0) cout << "Instantiated: FGFDMExec" << endl;
+    if (from == 1) cout << "Destroyed:    FGFDMExec" << endl;
+  }
+  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
+    if (from == 2) {
+      cout << "================== Frame: " << Frame << "  Time: "
+           << State->Getsim_time() << endl;
+    }
+  }
+  if (debug_lvl & 8 ) { // Runtime state variables
+  }
+  if (debug_lvl & 16) { // Sanity checking
+  }
+  if (debug_lvl & 64) {
+    if (from == 0) { // Constructor
+      cout << IdSrc << endl;
+      cout << IdHdr << endl;
+    }
+  }
 }