]> git.mxchange.org Git - flightgear.git/blobdiff - src/FDM/JSBSim/FGFDMExec.cpp
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[flightgear.git] / src / FDM / JSBSim / FGFDMExec.cpp
index a46a9644abe1ece6efbfd9bf3e2d02d5fe67e543..806a08b21959719cf9a26d1437be95989bd4c882 100644 (file)
@@ -1,4 +1,4 @@
-/*******************************************************************************
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
  Module:       FGFDMExec.cpp
  Author:       Jon S. Berndt
@@ -34,122 +34,263 @@ HISTORY
 --------------------------------------------------------------------------------
 11/17/98   JSB   Created
 
-********************************************************************************
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+COMMENTS, REFERENCES,  and NOTES
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 INCLUDES
-*******************************************************************************/
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
 #ifdef FGFS
 #  include <simgear/compiler.h>
-#  ifdef FG_HAVE_STD_INCLUDES
-#    include <iostream>
-#    include <ctime>
-#  else
+#  include STL_IOSTREAM
+#  include STL_ITERATOR
+#else
+#  if defined(sgi) && !defined(__GNUC__)
 #    include <iostream.h>
-#    include <time.h>
+#  else
+#    include <iostream>
 #  endif
-#else
-#  include <iostream>
-#  include <ctime>
+#  include <iterator>
 #endif
 
 #include "FGFDMExec.h"
 #include "FGState.h"
 #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"
 #include "FGPosition.h"
 #include "FGAuxiliary.h"
 #include "FGOutput.h"
-
-/*******************************************************************************
-************************************ CODE **************************************
-*******************************************************************************/
-
+#include "FGConfigFile.h"
+#include "FGInitialCondition.h"
+
+static const char *IdSrc = "$Id$";
+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
+                  // g) 16: When set various parameters are sanity checked and
+                  //    a message is printed out when they go out of bounds.
+
+unsigned int FGFDMExec::FDMctr = 0;
+
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+CLASS IMPLEMENTATION
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
 // Constructor
 
 FGFDMExec::FGFDMExec(void)
 {
-  FirstModel  = 0;
-  Error       = 0;
-  State       = 0;
-  Atmosphere  = 0;
-  FCS         = 0;
-  Aircraft    = 0;
-  Translation = 0;
-  Rotation    = 0;
-  Position    = 0;
-  Auxiliary   = 0;
-  Output      = 0;
-
-  // Instantiate this FDM Executive's Models
-
-  Atmosphere  = new FGAtmosphere(this);
-  FCS         = new FGFCS(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);
+  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;
+
+  IdFDM = FDMctr;
+  FDMctr++;
+
+  try {
+    char* num = getenv("JSBSIM_DEBUG");
+    if (!num) debug_lvl = 1;
+    else debug_lvl = atoi(num); // set debug level
+  } catch (...) {               // if error set to 1
+    debug_lvl = 1;
+  }
+
+  Debug(0);
+
+  Allocate();
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+FGFDMExec::~FGFDMExec()
+{
+  DeAllocate();
+
+  Debug(1);
+}
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+bool FGFDMExec::Allocate(void)
+{
+  bool result=true;
+
+  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()) {cerr << "Atmosphere model init failed"; Error+=1;}
-  if (!FCS->InitModel())        {cerr << "FCS model init failed"; Error+=2;}
-  if (!Aircraft->InitModel())   {cerr << "Aircraft model init failed"; Error+=4;}
-  if (!Translation->InitModel()){cerr << "Translation model init failed"; Error+=8;}
-  if (!Rotation->InitModel())   {cerr << "Rotation model init failed"; Error+=16;}
-  if (!Position->InitModel())   {cerr << "Position model init failed"; Error+=32;}
-  if (!Auxiliary->InitModel())  {cerr << "Auxiliary model init failed"; Error+=64;}
-  if (!Output->InitModel())     {cerr << "Output model init failed"; Error+=128;}
+  if (!Atmosphere->InitModel()) {
+    cerr << fgred << "Atmosphere model init failed" << fgdef << endl;
+    Error+=1;}
+  if (!FCS->InitModel())        {
+    cerr << fgred << "FCS model init failed" << fgdef << endl;
+    Error+=2;}
+  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+=128;}
+  if (!Translation->InitModel()){
+    cerr << fgred << "Translation model init failed" << fgdef << endl;
+    Error+=256;}
+  if (!Rotation->InitModel())   {
+    cerr << fgred << "Rotation model init failed" << fgdef << endl;
+    Error+=512;}
+  if (!Position->InitModel())   {
+    cerr << fgred << "Position model init failed" << fgdef << endl;
+    Error+=1024;}
+  if (!Auxiliary->InitModel())  {
+    cerr << fgred << "Auxiliary model init failed" << fgdef << endl;
+    Error+=2058;}
+  if (!Output->InitModel())     {
+    cerr << fgred << "Output model init failed" << fgdef << endl;
+    Error+=4096;}
+
+  if (Error > 0) result = false;
 
   // Schedule a model. The second arg (the integer) is the pass number. For
   // 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(Aircraft,    1);
-  Schedule(Rotation,    1);
-  Schedule(Translation, 1);
-  Schedule(Position,    1);
-  Schedule(Auxiliary,   1);
-  Schedule(Output,     1);
-
-  terminate = false;
-  frozen = false;
+  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;
+
+  return result;
 }
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+bool FGFDMExec::DeAllocate(void) {
+
+  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;
 
-FGFDMExec::~FGFDMExec(void){
-  
-  cout << "~FGFDMExec" << endl;
-  if ( Atmosphere != NULL )  delete Atmosphere;
-  cout << "Atmosphere" << endl;
-  if ( FCS != NULL )         delete FCS;
-  cout << "FCS" << endl;
-  if ( Aircraft != NULL )    delete Aircraft;
-  cout << "Aircraft" << endl;
-  if ( Translation != NULL ) delete Translation;
-  cout << "Translation" << endl;
-  if ( Rotation != NULL )    delete Rotation;
-  cout << "Rotation" << endl;
-  if ( Position != NULL )    delete Position;
-  cout << "Position" << endl;
-  if ( Auxiliary != NULL )   delete Auxiliary;
-  cout << "Auxiliary" << endl;
-  if ( Output != NULL )      delete Output;
-  cout << "Output" << endl;
-  if ( State != NULL )       delete State;
-  cout << "State" << endl;
-
+  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;
 }
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 int FGFDMExec::Schedule(FGModel* model, int rate)
 {
@@ -172,9 +313,11 @@ int FGFDMExec::Schedule(FGModel* model, int rate)
     model_iterator->NextModel->SetRate(rate);
 
   }
+  
   return 0;
 }
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 bool FGFDMExec::Run(void)
 {
@@ -185,17 +328,25 @@ bool FGFDMExec::Run(void)
   model_iterator = FirstModel;
   if (model_iterator == 0L) return false;
 
-  while (!model_iterator->Run())
-  {
+  if (Scripted) {
+    RunScript();
+    if (State->Getsim_time() >= EndTime) return false;
+  }
+
+  Debug(2);
+
+  while (!model_iterator->Run()) {
     model_iterator = model_iterator->NextModel;
     if (model_iterator == 0L) break;
   }
 
+  frame = Frame++;
   State->IncrTime();
 
   return true;
 }
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 bool FGFDMExec::RunIC(FGInitialCondition *fgic)
 {
@@ -205,16 +356,366 @@ bool FGFDMExec::RunIC(FGInitialCondition *fgic)
   State->Resume();
   return true;
 }
-  
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 bool FGFDMExec::LoadModel(string APath, string EPath, string model)
 {
-       AircraftPath = APath;
-       EnginePath = EPath;
-  return Aircraft->LoadAircraft(AircraftPath, EnginePath, model);
+  bool result = false;
+
+  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();
+  }
+
+  result = Aircraft->Load(&AC_cfg);
+
+  if (result) {
+    modelLoaded = true;
+    Debug(3);
+  } else {
+    cerr << fgred
+         << "  FGFDMExec: Failed to load aircraft and/or engine model"
+         << fgdef << endl;
+  }
+
+  return result;
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+bool FGFDMExec::LoadScript(string script)
+{
+  FGConfigFile Script(script);
+  string token="";
+  string aircraft="";
+  string initialize="";
+  bool result = false;
+  double dt = 0.0;
+  unsigned i;
+  struct condition *newCondition;
+
+  if (!Script.IsOpen()) return false;
+
+  Script.GetNextConfigLine();
+  ScriptName = Script.GetValue("name");
+  Scripted = true;
+  if (debug_lvl > 0) cout << "Reading Script File " << ScriptName << endl;
+
+  while (Script.GetNextConfigLine() != string("EOF") && Script.GetValue() != string("/runscript")) {
+    token = Script.GetValue();
+    if (token == "use") {
+      if ((token = Script.GetValue("aircraft")) != string("")) {
+        aircraft = token;
+        if (debug_lvl > 0) cout << "  Use aircraft: " << token << endl;
+      } else if ((token = Script.GetValue("initialize")) != string("")) {
+        initialize = token;
+        if (debug_lvl > 0) 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 != string("/run")) {
+
+        if (token == "when") {
+          Script.GetNextConfigLine();
+          token = Script.GetValue();
+          newCondition = new struct condition();
+          while (token != string("/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 if (token.empty()) {
+     // do nothing
+    } else {
+      cerr << "Unrecognized keyword in script file: \"" << token << "\" [runscript] " << endl;
+    }
+  }
+
+  if (aircraft == "") {
+    cerr << "Aircraft file not loaded in script" << endl;
+    exit(-1);
+  }
+
+  Debug(4);
+
+  result = LoadModel("aircraft", "engine", aircraft);
+  if (!result) {
+    cerr << "Aircraft file " << aircraft << " was not found" << endl;
+         exit(-1);
+  }
+
+  FGInitialCondition IC(this);
+  if ( ! IC.Load("aircraft", aircraft, initialize)) {
+    cerr << "Initialization unsuccessful" << endl;
+    exit(-1);
+  }
+
+  return true;
 }
 
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-bool FGFDMExec::RunScript(string script)
+void FGFDMExec::RunScript(void)
 {
+  vector <struct condition>::iterator iC = Conditions.begin();
+  bool truth = false;
+  bool WholeTruth = false;
+  unsigned i;
+
+  double currentTime = State->Getsim_time();
+  double newSetValue = 0;
+
+  while (iC < Conditions.end()) {
+    // determine whether the set of conditional tests for this condition equate
+    // to true
+    for (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 (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:
+            iC->newValue[i] = iC->SetValue[i];
+            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++;
+  }
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//    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)
+{
+  unsigned int i;
+
+  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";
+    } else if (from == 4)  { // print out script data
+      vector <struct condition>::iterator iterConditions = Conditions.begin();
+      int count=0;
+
+      cout << "\n  Script goes from " << StartTime << " to " << EndTime
+           << " with dt = " << State->Getdt() << endl << endl;
+
+      while (iterConditions < Conditions.end()) {
+        cout << "  Condition: " << count++ << endl;
+        cout << "    if (";
+
+        for (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 {";
+
+        for (i=0; i<iterConditions->SetValue.size(); i++) {
+          cout << endl << "      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++;
+      }
+
+      cout << endl;
+    }
+  }
+  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
+  }
 }