src/FDM/JSBSim/JSBSim.cxx

   1 // JSBsim.cxx -- interface to the JSBsim flight model
   2 //
   3 // Written by Curtis Olson, started February 1999.
   4 //
   5 // Copyright (C) 1999  Curtis L. Olson  - curt@flightgear.org
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #include <simgear/compiler.h>
  29
  30 #include <stdio.h>    //    size_t
  31 #include <string>
  32
  33 #include <simgear/constants.h>
  34 #include <simgear/debug/logstream.hxx>
  35 #include <simgear/math/sg_geodesy.hxx>
  36 #include <simgear/misc/sg_path.hxx>
  37 #include <simgear/structure/commands.hxx>
  38
  39 #include <FDM/flight.hxx>
  40
  41 #include <Aircraft/aircraft.hxx>
  42 #include <Aircraft/controls.hxx>
  43 #include <Main/globals.hxx>
  44 #include <Main/fg_props.hxx>
  45
  46 #include "JSBSim.hxx"
  47 #include <FDM/JSBSim/FGFDMExec.h>
  48 #include <FDM/JSBSim/FGJSBBase.h>
  49 #include <FDM/JSBSim/FGState.h>
  50 #include <FDM/JSBSim/initialization/FGInitialCondition.h>
  51 #include <FDM/JSBSim/initialization/FGTrim.h>
  52 #include <FDM/JSBSim/models/FGModel.h>
  53 #include <FDM/JSBSim/models/FGAircraft.h>
  54 #include <FDM/JSBSim/models/FGFCS.h>
  55 #include <FDM/JSBSim/models/FGPropagate.h>
  56 #include <FDM/JSBSim/models/FGAuxiliary.h>
  57 #include <FDM/JSBSim/models/FGInertial.h>
  58 #include <FDM/JSBSim/models/FGAtmosphere.h>
  59 #include <FDM/JSBSim/models/FGMassBalance.h>
  60 #include <FDM/JSBSim/models/FGAerodynamics.h>
  61 #include <FDM/JSBSim/models/FGLGear.h>
  62 #include <FDM/JSBSim/models/propulsion/FGEngine.h>
  63 #include <FDM/JSBSim/models/propulsion/FGPiston.h>
  64 #include <FDM/JSBSim/models/propulsion/FGTurbine.h>
  65 #include <FDM/JSBSim/models/propulsion/FGTurboProp.h>
  66 #include <FDM/JSBSim/models/propulsion/FGRocket.h>
  67 #include <FDM/JSBSim/models/propulsion/FGElectric.h>
  68 #include <FDM/JSBSim/models/propulsion/FGNozzle.h>
  69 #include <FDM/JSBSim/models/propulsion/FGPropeller.h>
  70 #include <FDM/JSBSim/models/propulsion/FGRotor.h>
  71 #include <FDM/JSBSim/models/propulsion/FGTank.h>
  72 #include <FDM/JSBSim/input_output/FGPropertyManager.h>
  73 #include <FDM/JSBSim/input_output/FGGroundCallback.h>
  74
  75 using namespace JSBSim;
  76
  77 static inline double
  78 FMAX (double a, double b)
  79 {
  80   return a > b ? a : b;
  81 }
  82
  83 class FGFSGroundCallback : public FGGroundCallback {
  84 public:
  85   FGFSGroundCallback(FGJSBsim* ifc) : mInterface(ifc) {}
  86   virtual ~FGFSGroundCallback() {}
  87
  88   /** Get the altitude above sea level dependent on the location. */
  89   virtual double GetAltitude(const FGLocation& l) const {
  90     double pt[3] = { SG_FEET_TO_METER*l(eX),
  91                      SG_FEET_TO_METER*l(eY),
  92                      SG_FEET_TO_METER*l(eZ) };
  93     double lat, lon, alt;
  94     sgCartToGeod( pt, &lat, &lon, &alt);
  95     return alt * SG_METER_TO_FEET;
  96   }
  97
  98   /** Compute the altitude above ground. */
  99   virtual double GetAGLevel(double t, const FGLocation& l,
 100                             FGLocation& cont,
 101                             FGColumnVector3& n, FGColumnVector3& v) const {
 102     double loc_cart[3] = { l(eX), l(eY), l(eZ) };
 103     double contact[3], normal[3], vel[3], agl = 0;
 104     mInterface->get_agl_ft(t, loc_cart, SG_METER_TO_FEET*2, contact, normal,
 105                            vel, &agl);
 106     n = FGColumnVector3( -normal[0], -normal[1], -normal[2] );
 107     v = FGColumnVector3( vel[0], vel[1], vel[2] );
 108     cont = FGColumnVector3( contact[0], contact[1], contact[2] );
 109     return agl;
 110   }
 111 private:
 112   FGJSBsim* mInterface;
 113 };
 114
 115 /******************************************************************************/
 116
 117 FGJSBsim::FGJSBsim( double dt )
 118   : FGInterface(dt), got_wire(false)
 119 {
 120     bool result;
 121                                 // Set up the debugging level
 122                                 // FIXME: this will not respond to
 123                                 // runtime changes
 124
 125                                 // if flight is excluded, don't bother
 126     if ((logbuf::get_log_classes() & SG_FLIGHT) != 0) {
 127
 128                                 // do a rough-and-ready mapping to
 129                                 // the levels documented in FGFDMExec.h
 130         switch (logbuf::get_log_priority()) {
 131         case SG_BULK:
 132             FGJSBBase::debug_lvl = 0x1f;
 133             break;
 134         case SG_DEBUG:
 135             FGJSBBase::debug_lvl = 0x0f;
 136         case SG_INFO:
 137             FGJSBBase::debug_lvl = 0x01;
 138             break;
 139         case SG_WARN:
 140         case SG_ALERT:
 141             FGJSBBase::debug_lvl = 0x00;
 142             break;
 143         }
 144     }
 145
 146     fdmex = new FGFDMExec( (FGPropertyManager*)globals->get_props() );
 147
 148     // Register ground callback.
 149     fdmex->SetGroundCallback( new FGFSGroundCallback(this) );
 150
 151     State           = fdmex->GetState();
 152     Atmosphere      = fdmex->GetAtmosphere();
 153     FCS             = fdmex->GetFCS();
 154     MassBalance     = fdmex->GetMassBalance();
 155     Propulsion      = fdmex->GetPropulsion();
 156     Aircraft        = fdmex->GetAircraft();
 157     Propagate        = fdmex->GetPropagate();
 158     Auxiliary       = fdmex->GetAuxiliary();
 159     Inertial        = fdmex->GetInertial();
 160     Aerodynamics    = fdmex->GetAerodynamics();
 161     GroundReactions = fdmex->GetGroundReactions();
 162
 163     fgic=fdmex->GetIC();
 164     needTrim=true;
 165
 166     SGPath aircraft_path( fgGetString("/sim/aircraft-dir") );
 167
 168     SGPath engine_path( fgGetString("/sim/aircraft-dir") );
 169     engine_path.append( "Engine" );
 170
 171     SGPath systems_path( fgGetString("/sim/aircraft-dir") );
 172     systems_path.append( "Systems" );
 173
 174     State->Setdt( dt );
 175
 176     result = fdmex->LoadModel( aircraft_path.str(),
 177                                engine_path.str(),
 178                                systems_path.str(),
 179                                fgGetString("/sim/aero"), false );
 180
 181     if (result) {
 182       SG_LOG( SG_FLIGHT, SG_INFO, "  loaded aero.");
 183     } else {
 184       SG_LOG( SG_FLIGHT, SG_INFO,
 185               "  aero does not exist (you may have mis-typed the name).");
 186       throw(-1);
 187     }
 188
 189     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 190     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 191     SG_LOG( SG_FLIGHT, SG_INFO, "After loading aero definition file ..." );
 192
 193     int Neng = Propulsion->GetNumEngines();
 194     SG_LOG( SG_FLIGHT, SG_INFO, "num engines = " << Neng );
 195
 196     if ( GroundReactions->GetNumGearUnits() <= 0 ) {
 197         SG_LOG( SG_FLIGHT, SG_ALERT, "num gear units = "
 198                 << GroundReactions->GetNumGearUnits() );
 199         SG_LOG( SG_FLIGHT, SG_ALERT, "This is a very bad thing because with 0 gear units, the ground trimming");
 200         SG_LOG( SG_FLIGHT, SG_ALERT, "routine (coming up later in the code) will core dump.");
 201         SG_LOG( SG_FLIGHT, SG_ALERT, "Halting the sim now, and hoping a solution will present itself soon!");
 202         exit(-1);
 203     }
 204
 205     init_gear();
 206
 207     // Set initial fuel levels if provided.
 208     for (unsigned int i = 0; i < Propulsion->GetNumTanks(); i++) {
 209       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 210       if (node->getChild("level-gal_us", 0, false) != 0) {
 211         Propulsion->GetTank(i)->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 212       } else {
 213         node->setDoubleValue("level-lbs", Propulsion->GetTank(i)->GetContents());
 214         node->setDoubleValue("level-gal_us", Propulsion->GetTank(i)->GetContents() / 6.6);
 215       }
 216       node->setDoubleValue("capacity-gal_us",
 217                            Propulsion->GetTank(i)->GetCapacity() / 6.6);
 218     }
 219     Propulsion->SetFuelFreeze((fgGetNode("/sim/freeze/fuel",true))->getBoolValue());
 220
 221     fgSetDouble("/fdm/trim/pitch-trim", FCS->GetPitchTrimCmd());
 222     fgSetDouble("/fdm/trim/throttle",   FCS->GetThrottleCmd(0));
 223     fgSetDouble("/fdm/trim/aileron",    FCS->GetDaCmd());
 224     fgSetDouble("/fdm/trim/rudder",     FCS->GetDrCmd());
 225
 226     startup_trim = fgGetNode("/sim/presets/trim", true);
 227
 228     trimmed = fgGetNode("/fdm/trim/trimmed", true);
 229     trimmed->setBoolValue(false);
 230
 231     pitch_trim = fgGetNode("/fdm/trim/pitch-trim", true );
 232     throttle_trim = fgGetNode("/fdm/trim/throttle", true );
 233     aileron_trim = fgGetNode("/fdm/trim/aileron", true );
 234     rudder_trim = fgGetNode("/fdm/trim/rudder", true );
 235
 236     stall_warning = fgGetNode("/sim/alarms/stall-warning",true);
 237     stall_warning->setDoubleValue(0);
 238
 239
 240     flap_pos_pct=fgGetNode("/surface-positions/flap-pos-norm",true);
 241     elevator_pos_pct=fgGetNode("/surface-positions/elevator-pos-norm",true);
 242     left_aileron_pos_pct
 243         =fgGetNode("/surface-positions/left-aileron-pos-norm",true);
 244     right_aileron_pos_pct
 245         =fgGetNode("/surface-positions/right-aileron-pos-norm",true);
 246     rudder_pos_pct=fgGetNode("/surface-positions/rudder-pos-norm",true);
 247     speedbrake_pos_pct
 248         =fgGetNode("/surface-positions/speedbrake-pos-norm",true);
 249     spoilers_pos_pct=fgGetNode("/surface-positions/spoilers-pos-norm",true);
 250     tailhook_pos_pct=fgGetNode("/gear/tailhook/position-norm",true);
 251     wing_fold_pos_pct=fgGetNode("surface-positions/wing-fold-pos-norm",true);
 252
 253     elevator_pos_pct->setDoubleValue(0);
 254     left_aileron_pos_pct->setDoubleValue(0);
 255     right_aileron_pos_pct->setDoubleValue(0);
 256     rudder_pos_pct->setDoubleValue(0);
 257     flap_pos_pct->setDoubleValue(0);
 258     speedbrake_pos_pct->setDoubleValue(0);
 259     spoilers_pos_pct->setDoubleValue(0);
 260
 261     temperature = fgGetNode("/environment/temperature-degc",true);
 262     pressure = fgGetNode("/environment/pressure-inhg",true);
 263     density = fgGetNode("/environment/density-slugft3",true);
 264     turbulence_gain = fgGetNode("/environment/turbulence/magnitude-norm",true);
 265     turbulence_rate = fgGetNode("/environment/turbulence/rate-hz",true);
 266
 267     wind_from_north= fgGetNode("/environment/wind-from-north-fps",true);
 268     wind_from_east = fgGetNode("/environment/wind-from-east-fps" ,true);
 269     wind_from_down = fgGetNode("/environment/wind-from-down-fps" ,true);
 270
 271     slaved = fgGetNode("/sim/slaved/enabled", true);
 272
 273     for (unsigned int i = 0; i < Propulsion->GetNumEngines(); i++) {
 274       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 275       Propulsion->GetEngine(i)->GetThruster()->SetRPM(node->getDoubleValue("rpm") /
 276                      Propulsion->GetEngine(i)->GetThruster()->GetGearRatio());
 277     }
 278
 279     hook_root_struct = FGColumnVector3(
 280         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-x-in", 196),
 281         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-y-in", 0),
 282         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-z-in", -16));
 283
 284     crashed = false;
 285 }
 286
 287 /******************************************************************************/
 288 FGJSBsim::~FGJSBsim(void)
 289 {
 290   delete fdmex;
 291 }
 292
 293 /******************************************************************************/
 294
 295 // Initialize the JSBsim flight model, dt is the time increment for
 296 // each subsequent iteration through the EOM
 297
 298 void FGJSBsim::init()
 299 {
 300     double tmp;
 301
 302     SG_LOG( SG_FLIGHT, SG_INFO, "Starting and initializing JSBsim" );
 303
 304     // Explicitly call the superclass's
 305     // init method first.
 306
 307     if (fgGetBool("/environment/params/control-fdm-atmosphere")) {
 308       Atmosphere->UseExternal();
 309       Atmosphere->SetExTemperature(
 310                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 311       Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 312       Atmosphere->SetExDensity(density->getDoubleValue());
 313       Atmosphere->SetTurbType(FGAtmosphere::ttCulp);
 314       Atmosphere->SetTurbGain(turbulence_gain->getDoubleValue());
 315       Atmosphere->SetTurbRate(turbulence_rate->getDoubleValue());
 316
 317     } else {
 318       Atmosphere->UseInternal();
 319     }
 320
 321     fgic->SetVNorthFpsIC( -wind_from_north->getDoubleValue() );
 322     fgic->SetVEastFpsIC( -wind_from_east->getDoubleValue() );
 323     fgic->SetVDownFpsIC( -wind_from_down->getDoubleValue() );
 324
 325     //Atmosphere->SetExTemperature(get_Static_temperature());
 326     //Atmosphere->SetExPressure(get_Static_pressure());
 327     //Atmosphere->SetExDensity(get_Density());
 328     SG_LOG(SG_FLIGHT,SG_INFO,"T,p,rho: " << fdmex->GetAtmosphere()->GetTemperature()
 329      << ", " << fdmex->GetAtmosphere()->GetPressure()
 330      << ", " << fdmex->GetAtmosphere()->GetDensity() );
 331
 332     if (fgGetBool("/sim/presets/running")) {
 333           for (unsigned int i=0; i < Propulsion->GetNumEngines(); i++) {
 334             SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 335             node->setBoolValue("running", true);
 336             Propulsion->GetEngine(i)->SetRunning(true);
 337           }
 338     }
 339
 340     FCS->SetDfPos( ofNorm, globals->get_controls()->get_flaps() );
 341
 342     common_init();
 343
 344     copy_to_JSBsim();
 345     fdmex->RunIC();     //loop JSBSim once w/o integrating
 346     copy_from_JSBsim(); //update the bus
 347
 348     SG_LOG( SG_FLIGHT, SG_INFO, "  Initialized JSBSim with:" );
 349
 350     switch(fgic->GetSpeedSet()) {
 351     case setned:
 352         SG_LOG(SG_FLIGHT,SG_INFO, "  Vn,Ve,Vd= "
 353                << Propagate->GetVel(FGJSBBase::eNorth) << ", "
 354                << Propagate->GetVel(FGJSBBase::eEast) << ", "
 355                << Propagate->GetVel(FGJSBBase::eDown) << " ft/s");
 356     break;
 357     case setuvw:
 358         SG_LOG(SG_FLIGHT,SG_INFO, "  U,V,W= "
 359                << Propagate->GetUVW(1) << ", "
 360                << Propagate->GetUVW(2) << ", "
 361                << Propagate->GetUVW(3) << " ft/s");
 362     break;
 363     case setmach:
 364         SG_LOG(SG_FLIGHT,SG_INFO, "  Mach: "
 365                << Auxiliary->GetMach() );
 366     break;
 367     case setvc:
 368     default:
 369         SG_LOG(SG_FLIGHT,SG_INFO, "  Indicated Airspeed: "
 370                << Auxiliary->GetVcalibratedKTS() << " knots" );
 371     break;
 372     }
 373
 374     stall_warning->setDoubleValue(0);
 375
 376     SG_LOG( SG_FLIGHT, SG_INFO, "  Bank Angle: "
 377             << Propagate->GetEuler(FGJSBBase::ePhi)*RADTODEG << " deg" );
 378     SG_LOG( SG_FLIGHT, SG_INFO, "  Pitch Angle: "
 379             << Propagate->GetEuler(FGJSBBase::eTht)*RADTODEG << " deg" );
 380     SG_LOG( SG_FLIGHT, SG_INFO, "  True Heading: "
 381             << Propagate->GetEuler(FGJSBBase::ePsi)*RADTODEG << " deg" );
 382     SG_LOG( SG_FLIGHT, SG_INFO, "  Latitude: "
 383             << Propagate->GetLocation().GetLatitudeDeg() << " deg" );
 384     SG_LOG( SG_FLIGHT, SG_INFO, "  Longitude: "
 385             << Propagate->GetLocation().GetLongitudeDeg() << " deg" );
 386     SG_LOG( SG_FLIGHT, SG_INFO, "  Altitude: "
 387             << Propagate->GetAltitudeASL() << " feet" );
 388     SG_LOG( SG_FLIGHT, SG_INFO, "  loaded initial conditions" );
 389
 390     SG_LOG( SG_FLIGHT, SG_INFO, "  set dt" );
 391
 392     SG_LOG( SG_FLIGHT, SG_INFO, "Finished initializing JSBSim" );
 393
 394     SG_LOG( SG_FLIGHT, SG_INFO, "FGControls::get_gear_down()= " <<
 395                                   globals->get_controls()->get_gear_down() );
 396 }
 397
 398 /******************************************************************************/
 399
 400 // Run an iteration of the EOM (equations of motion)
 401
 402 void FGJSBsim::update( double dt )
 403 {
 404     if(crashed) {
 405       if(!fgGetBool("/sim/crashed"))
 406         fgSetBool("/sim/crashed", true);
 407       return;
 408     }
 409
 410     if (is_suspended())
 411       return;
 412
 413     int multiloop = _calc_multiloop(dt);
 414
 415     int i;
 416
 417     // Compute the radius of the aircraft. That is the radius of a ball
 418     // where all gear units are in. At the moment it is at least 10ft ...
 419     double acrad = 10.0;
 420     int n_gears = GroundReactions->GetNumGearUnits();
 421     for (i=0; i<n_gears; ++i) {
 422       FGColumnVector3 bl = GroundReactions->GetGearUnit(i)->GetBodyLocation();
 423       double r = bl.Magnitude();
 424       if (acrad < r)
 425         acrad = r;
 426     }
 427
 428     // Compute the potential movement of this aircraft and query for the
 429     // ground in this area.
 430     double groundCacheRadius = acrad + 2*dt*Propagate->GetUVW().Magnitude();
 431     double alt, slr, lat, lon;
 432     FGColumnVector3 cart = Auxiliary->GetLocationVRP();
 433     if ( needTrim && startup_trim->getBoolValue() ) {
 434       alt = fgic->GetAltitudeASLFtIC();
 435       slr = fgic->GetSeaLevelRadiusFtIC();
 436       lat = fgic->GetLatitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 437       lon = fgic->GetLongitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 438       cart = FGLocation(lon, lat, alt+slr);
 439     }
 440     double cart_pos[3] = { cart(1), cart(2), cart(3) };
 441     double t0 = State->Getsim_time();
 442     bool cache_ok = prepare_ground_cache_ft( t0, t0 + dt, cart_pos,
 443                                              groundCacheRadius );
 444     if (!cache_ok) {
 445       SG_LOG(SG_FLIGHT, SG_WARN,
 446              "FGInterface is being called without scenery below the aircraft!");
 447
 448       alt = fgic->GetAltitudeASLFtIC();
 449       SG_LOG(SG_FLIGHT, SG_WARN, "altitude         = " << alt);
 450
 451       slr = fgic->GetSeaLevelRadiusFtIC();
 452       SG_LOG(SG_FLIGHT, SG_WARN, "sea level radius = " << slr);
 453
 454       lat = fgic->GetLatitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 455       SG_LOG(SG_FLIGHT, SG_WARN, "latitude         = " << lat);
 456
 457       lon = fgic->GetLongitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 458       SG_LOG(SG_FLIGHT, SG_WARN, "longitude        = " << lon);
 459       //return;
 460     }
 461
 462     copy_to_JSBsim();
 463
 464     trimmed->setBoolValue(false);
 465
 466     if ( needTrim ) {
 467       if ( startup_trim->getBoolValue() ) {
 468         double contact[3], d[3], agl;
 469         get_agl_ft(State->Getsim_time(), cart_pos, SG_METER_TO_FEET*2, contact,
 470                    d, d, &agl);
 471         double terrain_alt = sqrt(contact[0]*contact[0] + contact[1]*contact[1]
 472              + contact[2]*contact[2]) - fgic->GetSeaLevelRadiusFtIC();
 473
 474         SG_LOG(SG_FLIGHT, SG_INFO,
 475           "Ready to trim, terrain elevation is: "
 476             << terrain_alt * SG_METER_TO_FEET );
 477
 478         fgic->SetTerrainElevationFtIC( terrain_alt );
 479         do_trim();
 480       } else {
 481         fdmex->RunIC();  //apply any changes made through the set_ functions
 482       }
 483       needTrim = false;
 484     }
 485
 486     for ( i=0; i < multiloop; i++ ) {
 487       fdmex->Run();
 488       update_external_forces(State->Getsim_time() + i * State->Getdt());
 489     }
 490
 491     FGJSBBase::Message* msg;
 492     while (msg = fdmex->ProcessNextMessage()) {
 493 //      msg = fdmex->ProcessNextMessage();
 494       switch (msg->type) {
 495       case FGJSBBase::Message::eText:
 496         if (msg->text == "Crash Detected: Simulation FREEZE.")
 497           crashed = true;
 498         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text );
 499         break;
 500       case FGJSBBase::Message::eBool:
 501         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->bVal );
 502         break;
 503       case FGJSBBase::Message::eInteger:
 504         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->iVal );
 505         break;
 506       case FGJSBBase::Message::eDouble:
 507         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->dVal );
 508         break;
 509       default:
 510         SG_LOG( SG_FLIGHT, SG_INFO, "Unrecognized message type." );
 511         break;
 512       }
 513     }
 514
 515     // translate JSBsim back to FG structure so that the
 516     // autopilot (and the rest of the sim can use the updated values
 517     copy_from_JSBsim();
 518 }
 519
 520 /******************************************************************************/
 521
 522 // Convert from the FGInterface struct to the JSBsim generic_ struct
 523
 524 bool FGJSBsim::copy_to_JSBsim()
 525 {
 526     double tmp;
 527     unsigned int i;
 528
 529     // copy control positions into the JSBsim structure
 530
 531     FCS->SetDaCmd( globals->get_controls()->get_aileron());
 532     FCS->SetRollTrimCmd( globals->get_controls()->get_aileron_trim() );
 533     FCS->SetDeCmd( globals->get_controls()->get_elevator());
 534     FCS->SetPitchTrimCmd( globals->get_controls()->get_elevator_trim() );
 535     FCS->SetDrCmd( -globals->get_controls()->get_rudder() );
 536     FCS->SetYawTrimCmd( -globals->get_controls()->get_rudder_trim() );
 537     FCS->SetDsCmd( globals->get_controls()->get_rudder() );
 538     FCS->SetDfCmd( globals->get_controls()->get_flaps() );
 539     FCS->SetDsbCmd( globals->get_controls()->get_speedbrake() );
 540     FCS->SetDspCmd( globals->get_controls()->get_spoilers() );
 541
 542         // Parking brake sets minimum braking
 543         // level for mains.
 544     double parking_brake = globals->get_controls()->get_brake_parking();
 545     FCS->SetLBrake(FMAX(globals->get_controls()->get_brake_left(), parking_brake));
 546     FCS->SetRBrake(FMAX(globals->get_controls()->get_brake_right(), parking_brake));
 547     FCS->SetCBrake( 0.0 );
 548     // FCS->SetCBrake( globals->get_controls()->get_brake(2) );
 549
 550     FCS->SetGearCmd( globals->get_controls()->get_gear_down());
 551     for (i = 0; i < Propulsion->GetNumEngines(); i++) {
 552       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 553
 554       FCS->SetThrottleCmd(i, globals->get_controls()->get_throttle(i));
 555       FCS->SetMixtureCmd(i, globals->get_controls()->get_mixture(i));
 556       FCS->SetPropAdvanceCmd(i, globals->get_controls()->get_prop_advance(i));
 557       FCS->SetFeatherCmd(i, globals->get_controls()->get_feather(i));
 558
 559       switch (Propulsion->GetEngine(i)->GetType()) {
 560       case FGEngine::etPiston:
 561         { // FGPiston code block
 562         FGPiston* eng = (FGPiston*)Propulsion->GetEngine(i);
 563         eng->SetMagnetos( globals->get_controls()->get_magnetos(i) );
 564         break;
 565         } // end FGPiston code block
 566       case FGEngine::etTurbine:
 567         { // FGTurbine code block
 568         FGTurbine* eng = (FGTurbine*)Propulsion->GetEngine(i);
 569         eng->SetAugmentation( globals->get_controls()->get_augmentation(i) );
 570         eng->SetReverse( globals->get_controls()->get_reverser(i) );
 571         //eng->SetInjection( globals->get_controls()->get_water_injection(i) );
 572         eng->SetCutoff( globals->get_controls()->get_cutoff(i) );
 573         eng->SetIgnition( globals->get_controls()->get_ignition(i) );
 574         break;
 575         } // end FGTurbine code block
 576       case FGEngine::etRocket:
 577         { // FGRocket code block
 578         FGRocket* eng = (FGRocket*)Propulsion->GetEngine(i);
 579         break;
 580         } // end FGRocket code block
 581       case FGEngine::etTurboprop:
 582         { // FGTurboProp code block
 583         FGTurboProp* eng = (FGTurboProp*)Propulsion->GetEngine(i);
 584         eng->SetReverse( globals->get_controls()->get_reverser(i) );
 585         eng->SetCutoff( globals->get_controls()->get_cutoff(i) );
 586         eng->SetIgnition( globals->get_controls()->get_ignition(i) );
 587
 588         eng->SetGeneratorPower( globals->get_controls()->get_generator_breaker(i) );
 589         eng->SetCondition( globals->get_controls()->get_condition(i) );
 590         break;
 591         } // end FGTurboProp code block
 592       default:
 593         break;
 594       }
 595
 596       { // FGEngine code block
 597       FGEngine* eng = Propulsion->GetEngine(i);
 598
 599       eng->SetStarter( globals->get_controls()->get_starter(i) );
 600       eng->SetRunning( node->getBoolValue("running") );
 601       } // end FGEngine code block
 602     }
 603
 604
 605     Propagate->SetSeaLevelRadius( get_Sea_level_radius() );
 606
 607     Atmosphere->SetExTemperature(
 608                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 609     Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 610     Atmosphere->SetExDensity(density->getDoubleValue());
 611
 612     tmp = turbulence_gain->getDoubleValue();
 613     //Atmosphere->SetTurbGain(tmp * tmp * 100.0);
 614
 615     tmp = turbulence_rate->getDoubleValue();
 616     //Atmosphere->SetTurbRate(tmp);
 617
 618     Atmosphere->SetWindNED( -wind_from_north->getDoubleValue(),
 619                             -wind_from_east->getDoubleValue(),
 620                             -wind_from_down->getDoubleValue() );
 621 //    SG_LOG(SG_FLIGHT,SG_INFO, "Wind NED: "
 622 //                  << get_V_north_airmass() << ", "
 623 //                  << get_V_east_airmass()  << ", "
 624 //                  << get_V_down_airmass() );
 625
 626     for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 627       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 628       FGTank * tank = Propulsion->GetTank(i);
 629       tank->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 630 //       tank->SetContents(node->getDoubleValue("level-lbs"));
 631     }
 632
 633     Propulsion->SetFuelFreeze((fgGetNode("/sim/freeze/fuel",true))->getBoolValue());
 634     fdmex->SetChild(slaved->getBoolValue());
 635
 636     return true;
 637 }
 638
 639 /******************************************************************************/
 640
 641 // Convert from the JSBsim generic_ struct to the FGInterface struct
 642
 643 bool FGJSBsim::copy_from_JSBsim()
 644 {
 645     unsigned int i, j;
 646 /*
 647     _set_Inertias( MassBalance->GetMass(),
 648                    MassBalance->GetIxx(),
 649                    MassBalance->GetIyy(),
 650                    MassBalance->GetIzz(),
 651                    MassBalance->GetIxz() );
 652 */
 653     _set_CG_Position( MassBalance->GetXYZcg(1),
 654                       MassBalance->GetXYZcg(2),
 655                       MassBalance->GetXYZcg(3) );
 656
 657     _set_Accels_Body( Aircraft->GetBodyAccel(1),
 658                       Aircraft->GetBodyAccel(2),
 659                       Aircraft->GetBodyAccel(3) );
 660
 661     _set_Accels_CG_Body_N ( Aircraft->GetNcg(1),
 662                             Aircraft->GetNcg(2),
 663                             Aircraft->GetNcg(3) );
 664
 665     _set_Accels_Pilot_Body( Auxiliary->GetPilotAccel(1),
 666                             Auxiliary->GetPilotAccel(2),
 667                             Auxiliary->GetPilotAccel(3) );
 668
 669     _set_Nlf( Aircraft->GetNlf() );
 670
 671     // Velocities
 672
 673     _set_Velocities_Local( Propagate->GetVel(FGJSBBase::eNorth),
 674                            Propagate->GetVel(FGJSBBase::eEast),
 675                            Propagate->GetVel(FGJSBBase::eDown) );
 676
 677     _set_Velocities_Wind_Body( Propagate->GetUVW(1),
 678                                Propagate->GetUVW(2),
 679                                Propagate->GetUVW(3) );
 680
 681     // Make the HUD work ...
 682     _set_Velocities_Ground( Propagate->GetVel(FGJSBBase::eNorth),
 683                             Propagate->GetVel(FGJSBBase::eEast),
 684                             -Propagate->GetVel(FGJSBBase::eDown) );
 685
 686     _set_V_rel_wind( Auxiliary->GetVt() );
 687
 688     _set_V_equiv_kts( Auxiliary->GetVequivalentKTS() );
 689
 690     _set_V_calibrated_kts( Auxiliary->GetVcalibratedKTS() );
 691
 692     _set_V_ground_speed( Auxiliary->GetVground() );
 693
 694     _set_Omega_Body( Propagate->GetPQR(FGJSBBase::eP),
 695                      Propagate->GetPQR(FGJSBBase::eQ),
 696                      Propagate->GetPQR(FGJSBBase::eR) );
 697
 698     _set_Euler_Rates( Auxiliary->GetEulerRates(FGJSBBase::ePhi),
 699                       Auxiliary->GetEulerRates(FGJSBBase::eTht),
 700                       Auxiliary->GetEulerRates(FGJSBBase::ePsi) );
 701
 702     _set_Mach_number( Auxiliary->GetMach() );
 703
 704     // Positions of Visual Reference Point
 705     FGLocation l = Auxiliary->GetLocationVRP();
 706     _updateGeocentricPosition( l.GetLatitude(), l.GetLongitude(),
 707                                l.GetRadius() - get_Sea_level_radius() );
 708
 709     _set_Altitude_AGL( Propagate->GetDistanceAGL() );
 710     {
 711       double loc_cart[3] = { l(FGJSBBase::eX), l(FGJSBBase::eY), l(FGJSBBase::eZ) };
 712       double contact[3], d[3], sd, t;
 713       is_valid_m(&t, d, &sd);
 714       get_agl_ft(t, loc_cart, SG_METER_TO_FEET*2, contact, d, d, &sd);
 715       double rwrad
 716         = FGColumnVector3( contact[0], contact[1], contact[2] ).Magnitude();
 717       _set_Runway_altitude( rwrad - get_Sea_level_radius() );
 718     }
 719
 720     _set_Euler_Angles( Propagate->GetEuler(FGJSBBase::ePhi),
 721                        Propagate->GetEuler(FGJSBBase::eTht),
 722                        Propagate->GetEuler(FGJSBBase::ePsi) );
 723
 724     _set_Alpha( Auxiliary->Getalpha() );
 725     _set_Beta( Auxiliary->Getbeta() );
 726
 727
 728     _set_Gamma_vert_rad( Auxiliary->GetGamma() );
 729
 730     _set_Earth_position_angle( Inertial->GetEarthPositionAngle() );
 731
 732     _set_Climb_Rate( Propagate->Gethdot() );
 733
 734     const FGMatrix33& Tl2b = Propagate->GetTl2b();
 735     for ( i = 1; i <= 3; i++ ) {
 736         for ( j = 1; j <= 3; j++ ) {
 737             _set_T_Local_to_Body( i, j, Tl2b(i,j) );
 738         }
 739     }
 740
 741     // Copy the engine values from JSBSim.
 742     for ( i=0; i < Propulsion->GetNumEngines(); i++ ) {
 743       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 744       char buf[30];
 745       sprintf(buf, "engines/engine[%d]/thruster", i);
 746       SGPropertyNode * tnode = fgGetNode(buf, true);
 747       FGThruster * thruster = Propulsion->GetEngine(i)->GetThruster();
 748
 749       switch (Propulsion->GetEngine(i)->GetType()) {
 750       case FGEngine::etPiston:
 751         { // FGPiston code block
 752         FGPiston* eng = (FGPiston*)Propulsion->GetEngine(i);
 753         node->setDoubleValue("egt-degf", eng->getExhaustGasTemp_degF());
 754         node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
 755         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 756         node->setDoubleValue("mp-osi", eng->getManifoldPressure_inHg());
 757         // NOTE: mp-osi is not in ounces per square inch.
 758         // This error is left for reasons of backwards compatibility with
 759         // existing FlightGear sound and instrument configurations.
 760         node->setDoubleValue("mp-inhg", eng->getManifoldPressure_inHg());
 761         node->setDoubleValue("cht-degf", eng->getCylinderHeadTemp_degF());
 762         node->setDoubleValue("rpm", eng->getRPM());
 763         } // end FGPiston code block
 764         break;
 765       case FGEngine::etRocket:
 766         { // FGRocket code block
 767         FGRocket* eng = (FGRocket*)Propulsion->GetEngine(i);
 768         } // end FGRocket code block
 769         break;
 770       case FGEngine::etTurbine:
 771         { // FGTurbine code block
 772         FGTurbine* eng = (FGTurbine*)Propulsion->GetEngine(i);
 773         node->setDoubleValue("n1", eng->GetN1());
 774         node->setDoubleValue("n2", eng->GetN2());
 775         node->setDoubleValue("egt_degf", 32 + eng->GetEGT()*9/5);
 776         node->setBoolValue("augmentation", eng->GetAugmentation());
 777         node->setBoolValue("water-injection", eng->GetInjection());
 778         node->setBoolValue("ignition", eng->GetIgnition());
 779         node->setDoubleValue("nozzle-pos-norm", eng->GetNozzle());
 780         node->setDoubleValue("inlet-pos-norm", eng->GetInlet());
 781         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 782         node->setBoolValue("reversed", eng->GetReversed());
 783         node->setBoolValue("cutoff", eng->GetCutoff());
 784         node->setDoubleValue("epr", eng->GetEPR());
 785         globals->get_controls()->set_reverser(i, eng->GetReversed() );
 786         globals->get_controls()->set_cutoff(i, eng->GetCutoff() );
 787         globals->get_controls()->set_water_injection(i, eng->GetInjection() );
 788         globals->get_controls()->set_augmentation(i, eng->GetAugmentation() );
 789         } // end FGTurbine code block
 790         break;
 791       case FGEngine::etTurboprop:
 792         { // FGTurboProp code block
 793         FGTurboProp* eng = (FGTurboProp*)Propulsion->GetEngine(i);
 794         node->setDoubleValue("n1", eng->GetN1());
 795         //node->setDoubleValue("n2", eng->GetN2());
 796         node->setDoubleValue("itt_degf", 32 + eng->GetITT()*9/5);
 797         node->setBoolValue("ignition", eng->GetIgnition());
 798         node->setDoubleValue("nozzle-pos-norm", eng->GetNozzle());
 799         node->setDoubleValue("inlet-pos-norm", eng->GetInlet());
 800         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 801         node->setBoolValue("reversed", eng->GetReversed());
 802         node->setBoolValue("cutoff", eng->GetCutoff());
 803         node->setBoolValue("starting", eng->GetEngStarting());
 804         node->setBoolValue("generator-power", eng->GetGeneratorPower());
 805         node->setBoolValue("damaged", eng->GetCondition());
 806         node->setBoolValue("ielu-intervent", eng->GetIeluIntervent());
 807         node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
 808 //        node->setBoolValue("onfire", eng->GetFire());
 809         globals->get_controls()->set_reverser(i, eng->GetReversed() );
 810         globals->get_controls()->set_cutoff(i, eng->GetCutoff() );
 811         } // end FGTurboProp code block
 812         break;
 813       case FGEngine::etElectric:
 814         { // FGElectric code block
 815         FGElectric* eng = (FGElectric*)Propulsion->GetEngine(i);
 816         node->setDoubleValue("rpm", eng->getRPM());
 817         } // end FGElectric code block
 818         break;
 819       }
 820
 821       { // FGEngine code block
 822       FGEngine* eng = Propulsion->GetEngine(i);
 823       node->setDoubleValue("fuel-flow-gph", eng->getFuelFlow_gph());
 824       node->setDoubleValue("thrust_lb", thruster->GetThrust());
 825       node->setDoubleValue("fuel-flow_pph", eng->getFuelFlow_pph());
 826       node->setBoolValue("running", eng->GetRunning());
 827       node->setBoolValue("starter", eng->GetStarter());
 828       node->setBoolValue("cranking", eng->GetCranking());
 829       globals->get_controls()->set_starter(i, eng->GetStarter() );
 830       } // end FGEngine code block
 831
 832       switch (thruster->GetType()) {
 833       case FGThruster::ttNozzle:
 834         { // FGNozzle code block
 835         FGNozzle* noz = (FGNozzle*)thruster;
 836         } // end FGNozzle code block
 837         break;
 838       case FGThruster::ttPropeller:
 839         { // FGPropeller code block
 840         FGPropeller* prop = (FGPropeller*)thruster;
 841         tnode->setDoubleValue("rpm", thruster->GetRPM());
 842         tnode->setDoubleValue("pitch", prop->GetPitch());
 843         tnode->setDoubleValue("torque", prop->GetTorque());
 844         tnode->setBoolValue("feathered", prop->GetFeather());
 845         } // end FGPropeller code block
 846         break;
 847       case FGThruster::ttRotor:
 848         { // FGRotor code block
 849         FGRotor* rotor = (FGRotor*)thruster;
 850         } // end FGRotor code block
 851         break;
 852       case FGThruster::ttDirect:
 853         { // Direct code block
 854         } // end Direct code block
 855         break;
 856       }
 857
 858     }
 859
 860     // Copy the fuel levels from JSBSim if fuel
 861     // freeze not enabled.
 862     if ( ! Propulsion->GetFuelFreeze() ) {
 863       for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 864         SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 865         FGTank* tank = Propulsion->GetTank(i);
 866         double contents = tank->GetContents();
 867         double temp = tank->GetTemperature_degC();
 868         node->setDoubleValue("level-gal_us", contents/6.6);
 869         node->setDoubleValue("level-lbs", contents);
 870         if (temp != -9999.0) node->setDoubleValue("temperature_degC", temp);
 871       }
 872     }
 873
 874     update_gear();
 875
 876     stall_warning->setDoubleValue( Aerodynamics->GetStallWarn() );
 877
 878     elevator_pos_pct->setDoubleValue( FCS->GetDePos(ofNorm) );
 879     left_aileron_pos_pct->setDoubleValue( FCS->GetDaLPos(ofNorm) );
 880     right_aileron_pos_pct->setDoubleValue( FCS->GetDaRPos(ofNorm) );
 881     rudder_pos_pct->setDoubleValue( -1*FCS->GetDrPos(ofNorm) );
 882     flap_pos_pct->setDoubleValue( FCS->GetDfPos(ofNorm) );
 883     speedbrake_pos_pct->setDoubleValue( FCS->GetDsbPos(ofNorm) );
 884     spoilers_pos_pct->setDoubleValue( FCS->GetDspPos(ofNorm) );
 885     tailhook_pos_pct->setDoubleValue( FCS->GetTailhookPos() );
 886     wing_fold_pos_pct->setDoubleValue( FCS->GetWingFoldPos() );
 887
 888     // force a sim crashed if crashed (altitude AGL < 0)
 889     if (get_Altitude_AGL() < -100.0) {
 890          State->SuspendIntegration();
 891          crashed = true;
 892     }
 893
 894     return true;
 895 }
 896
 897
 898 bool FGJSBsim::ToggleDataLogging(void)
 899 {
 900   // ToDo: handle this properly
 901   fdmex->DisableOutput();
 902   return false;
 903 }
 904
 905
 906 bool FGJSBsim::ToggleDataLogging(bool state)
 907 {
 908     if (state) {
 909       fdmex->EnableOutput();
 910       return true;
 911     } else {
 912       fdmex->DisableOutput();
 913       return false;
 914     }
 915 }
 916
 917
 918 //Positions
 919 void FGJSBsim::set_Latitude(double lat)
 920 {
 921     static SGConstPropertyNode_ptr altitude = fgGetNode("/position/altitude-ft");
 922     double alt;
 923     double sea_level_radius_meters, lat_geoc;
 924
 925     // In case we're not trimming
 926     FGInterface::set_Latitude(lat);
 927
 928     if ( altitude->getDoubleValue() > -9990 ) {
 929       alt = altitude->getDoubleValue();
 930     } else {
 931       alt = 0.0;
 932     }
 933
 934     update_ic();
 935     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Latitude: " << lat );
 936     SG_LOG(SG_FLIGHT,SG_INFO," cur alt (ft) =  " << alt );
 937
 938     sgGeodToGeoc( lat, alt * SG_FEET_TO_METER,
 939                       &sea_level_radius_meters, &lat_geoc );
 940     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
 941     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET  );
 942     fgic->SetLatitudeRadIC( lat_geoc );
 943     needTrim=true;
 944 }
 945
 946
 947 void FGJSBsim::set_Longitude(double lon)
 948 {
 949     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Longitude: " << lon );
 950
 951     // In case we're not trimming
 952     FGInterface::set_Longitude(lon);
 953
 954     update_ic();
 955     fgic->SetLongitudeRadIC( lon );
 956     needTrim=true;
 957 }
 958
 959 // Sets the altitude above sea level.
 960 void FGJSBsim::set_Altitude(double alt)
 961 {
 962     static SGConstPropertyNode_ptr latitude = fgGetNode("/position/latitude-deg");
 963
 964     double sea_level_radius_meters,lat_geoc;
 965
 966     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Altitude: " << alt );
 967     SG_LOG(SG_FLIGHT,SG_INFO, "  lat (deg) = " << latitude->getDoubleValue() );
 968
 969     // In case we're not trimming
 970     FGInterface::set_Altitude(alt);
 971
 972     update_ic();
 973     sgGeodToGeoc( latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS, alt,
 974                   &sea_level_radius_meters, &lat_geoc);
 975     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
 976     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET );
 977     SG_LOG(SG_FLIGHT, SG_INFO,
 978           "Terrain elevation: " << cur_fdm_state->get_Runway_altitude() * SG_METER_TO_FEET );
 979     fgic->SetLatitudeRadIC( lat_geoc );
 980     fgic->SetAltitudeASLFtIC(alt);
 981     needTrim=true;
 982 }
 983
 984 void FGJSBsim::set_V_calibrated_kts(double vc)
 985 {
 986     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_V_calibrated_kts: " <<  vc );
 987
 988     // In case we're not trimming
 989     FGInterface::set_V_calibrated_kts(vc);
 990
 991     update_ic();
 992     fgic->SetVcalibratedKtsIC(vc);
 993     needTrim=true;
 994 }
 995
 996 void FGJSBsim::set_Mach_number(double mach)
 997 {
 998     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Mach_number: " <<  mach );
 999
1000     // In case we're not trimming
1001     FGInterface::set_Mach_number(mach);
1002
1003     update_ic();
1004     fgic->SetMachIC(mach);
1005     needTrim=true;
1006 }
1007
1008 void FGJSBsim::set_Velocities_Local( double north, double east, double down )
1009 {
1010     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Local: "
1011        << north << ", " <<  east << ", " << down );
1012
1013     // In case we're not trimming
1014     FGInterface::set_Velocities_Local(north, east, down);
1015
1016     update_ic();
1017     fgic->SetVNorthFpsIC(north);
1018     fgic->SetVEastFpsIC(east);
1019     fgic->SetVDownFpsIC(down);
1020     needTrim=true;
1021 }
1022
1023 void FGJSBsim::set_Velocities_Wind_Body( double u, double v, double w)
1024 {
1025     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Wind_Body: "
1026        << u << ", " <<  v << ", " <<  w );
1027
1028     // In case we're not trimming
1029     FGInterface::set_Velocities_Wind_Body(u, v, w);
1030
1031     update_ic();
1032     fgic->SetUBodyFpsIC(u);
1033     fgic->SetVBodyFpsIC(v);
1034     fgic->SetWBodyFpsIC(w);
1035     needTrim=true;
1036 }
1037
1038 //Euler angles
1039 void FGJSBsim::set_Euler_Angles( double phi, double theta, double psi )
1040 {
1041     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Euler_Angles: "
1042        << phi << ", " << theta << ", " << psi );
1043
1044     // In case we're not trimming
1045     FGInterface::set_Euler_Angles(phi, theta, psi);
1046
1047     update_ic();
1048     fgic->SetThetaRadIC(theta);
1049     fgic->SetPhiRadIC(phi);
1050     fgic->SetPsiRadIC(psi);
1051     needTrim=true;
1052 }
1053
1054 //Flight Path
1055 void FGJSBsim::set_Climb_Rate( double roc)
1056 {
1057     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Climb_Rate: " << roc );
1058
1059     // In case we're not trimming
1060     FGInterface::set_Climb_Rate(roc);
1061
1062     update_ic();
1063     //since both climb rate and flight path angle are set in the FG
1064     //startup sequence, something is needed to keep one from cancelling
1065     //out the other.
1066     if( !(fabs(roc) > 1 && fabs(fgic->GetFlightPathAngleRadIC()) < 0.01) ) {
1067       fgic->SetClimbRateFpsIC(roc);
1068     }
1069     needTrim=true;
1070 }
1071
1072 void FGJSBsim::set_Gamma_vert_rad( double gamma)
1073 {
1074     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Gamma_vert_rad: " << gamma );
1075
1076     update_ic();
1077     if( !(fabs(gamma) < 0.01 && fabs(fgic->GetClimbRateFpsIC()) > 1) ) {
1078       fgic->SetFlightPathAngleRadIC(gamma);
1079     }
1080     needTrim=true;
1081 }
1082
1083 void FGJSBsim::init_gear(void )
1084 {
1085     FGGroundReactions* gr=fdmex->GetGroundReactions();
1086     int Ngear=GroundReactions->GetNumGearUnits();
1087     for (int i=0;i<Ngear;i++) {
1088       FGLGear *gear = gr->GetGearUnit(i);
1089       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
1090       node->setDoubleValue("xoffset-in", gear->GetBodyLocation()(1));
1091       node->setDoubleValue("yoffset-in", gear->GetBodyLocation()(2));
1092       node->setDoubleValue("zoffset-in", gear->GetBodyLocation()(3));
1093       node->setBoolValue("wow", gear->GetWOW());
1094       node->setDoubleValue("rollspeed-ms", gear->GetWheelRollVel()*0.3043);
1095       node->setBoolValue("has-brake", gear->GetBrakeGroup() > 0);
1096       node->setDoubleValue("position-norm", gear->GetGearUnitPos());
1097       node->setDoubleValue("tire-pressure-norm", gear->GetTirePressure());
1098       node->setDoubleValue("compression-norm", gear->GetCompLen());
1099       node->setDoubleValue("compression-ft", gear->GetCompLen());
1100       if ( gear->GetSteerable() )
1101         node->setDoubleValue("steering-norm", gear->GetSteerNorm());
1102     }
1103 }
1104
1105 void FGJSBsim::update_gear(void)
1106 {
1107     FGGroundReactions* gr=fdmex->GetGroundReactions();
1108     int Ngear=GroundReactions->GetNumGearUnits();
1109     for (int i=0;i<Ngear;i++) {
1110       FGLGear *gear = gr->GetGearUnit(i);
1111       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
1112       node->getChild("wow", 0, true)->setBoolValue( gear->GetWOW());
1113       node->getChild("rollspeed-ms", 0, true)->setDoubleValue(gear->GetWheelRollVel()*0.3043);
1114       node->getChild("position-norm", 0, true)->setDoubleValue(gear->GetGearUnitPos());
1115       gear->SetTirePressure(node->getDoubleValue("tire-pressure-norm"));
1116       node->setDoubleValue("compression-norm", gear->GetCompLen());
1117       node->setDoubleValue("compression-ft", gear->GetCompLen());
1118       if ( gear->GetSteerable() )
1119         node->setDoubleValue("steering-norm", gear->GetSteerNorm());
1120     }
1121 }
1122
1123 void FGJSBsim::do_trim(void)
1124 {
1125   FGTrim *fgtrim;
1126
1127   if ( fgGetBool("/sim/presets/onground") )
1128   {
1129     fgtrim = new FGTrim(fdmex,tGround);
1130   } else {
1131     fgtrim = new FGTrim(fdmex,tLongitudinal);
1132   }
1133
1134   if ( !fgtrim->DoTrim() ) {
1135     fgtrim->Report();
1136     fgtrim->TrimStats();
1137   } else {
1138     trimmed->setBoolValue(true);
1139   }
1140 //  if (FGJSBBase::debug_lvl > 0)
1141 //      State->ReportState();
1142
1143   delete fgtrim;
1144
1145   pitch_trim->setDoubleValue( FCS->GetPitchTrimCmd() );
1146   throttle_trim->setDoubleValue( FCS->GetThrottleCmd(0) );
1147   aileron_trim->setDoubleValue( FCS->GetDaCmd() );
1148   rudder_trim->setDoubleValue( FCS->GetDrCmd() );
1149
1150   globals->get_controls()->set_elevator_trim(FCS->GetPitchTrimCmd());
1151   globals->get_controls()->set_elevator(FCS->GetDeCmd());
1152   globals->get_controls()->set_throttle(FGControls::ALL_ENGINES,
1153   FCS->GetThrottleCmd(0));
1154
1155   globals->get_controls()->set_aileron(FCS->GetDaCmd());
1156   globals->get_controls()->set_rudder( FCS->GetDrCmd());
1157
1158   SG_LOG( SG_FLIGHT, SG_INFO, "  Trim complete" );
1159 }
1160
1161 void FGJSBsim::update_ic(void)
1162 {
1163    if ( !needTrim ) {
1164      fgic->SetLatitudeRadIC(get_Lat_geocentric() );
1165      fgic->SetLongitudeRadIC( get_Longitude() );
1166      fgic->SetAltitudeASLFtIC( get_Altitude() );
1167      fgic->SetVcalibratedKtsIC( get_V_calibrated_kts() );
1168      fgic->SetThetaRadIC( get_Theta() );
1169      fgic->SetPhiRadIC( get_Phi() );
1170      fgic->SetPsiRadIC( get_Psi() );
1171      fgic->SetClimbRateFpsIC( get_Climb_Rate() );
1172    }
1173 }
1174
1175 bool
1176 FGJSBsim::get_agl_ft(double t, const double pt[3], double alt_off,
1177                      double contact[3], double normal[3], double vel[3],
1178                      double *agl)
1179 {
1180    double angularVel[3];
1181    const SGMaterial* material;
1182    simgear::BVHNode::Id id;
1183    if (!FGInterface::get_agl_ft(t, pt, alt_off, contact, normal, vel,
1184                                 angularVel, material, id))
1185        return false;
1186    SGGeod geodPt = SGGeod::fromCart(SG_FEET_TO_METER*SGVec3d(pt));
1187    SGQuatd hlToEc = SGQuatd::fromLonLat(geodPt);
1188    *agl = dot(hlToEc.rotate(SGVec3d(0, 0, 1)), SGVec3d(contact) - SGVec3d(pt));
1189    return true;
1190 }
1191
1192 inline static double dot3(const FGColumnVector3& a, const FGColumnVector3& b)
1193 {
1194     return a(1) * b(1) + a(2) * b(2) + a(3) * b(3);
1195 }
1196
1197 inline static double sqr(double x)
1198 {
1199     return x * x;
1200 }
1201
1202 static double angle_diff(double a, double b)
1203 {
1204     double diff = fabs(a - b);
1205     if (diff > 180) diff = 360 - diff;
1206
1207     return diff;
1208 }
1209
1210 static void check_hook_solution(const FGColumnVector3& ground_normal_body, double E, double hook_length, double sin_fi_guess, double cos_fi_guess, double* sin_fis, double* cos_fis, double* fis, int* points)
1211 {
1212     FGColumnVector3 tip(-hook_length * cos_fi_guess, 0, hook_length * sin_fi_guess);
1213     double dist = dot3(tip, ground_normal_body);
1214     if (fabs(dist + E) < 0.0001) {
1215         sin_fis[*points] = sin_fi_guess;
1216         cos_fis[*points] = cos_fi_guess;
1217         fis[*points] = atan2(sin_fi_guess, cos_fi_guess) * SG_RADIANS_TO_DEGREES;
1218         (*points)++;
1219     }
1220 }
1221
1222
1223 static void check_hook_solution(const FGColumnVector3& ground_normal_body, double E, double hook_length, double sin_fi_guess, double* sin_fis, double* cos_fis, double* fis, int* points)
1224 {
1225     if (sin_fi_guess >= -1 && sin_fi_guess <= 1) {
1226         double cos_fi_guess = sqrt(1 - sqr(sin_fi_guess));
1227         check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, cos_fi_guess, sin_fis, cos_fis, fis, points);
1228         if (fabs(cos_fi_guess) > SG_EPSILON) {
1229             check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, -cos_fi_guess, sin_fis, cos_fis, fis, points);
1230         }
1231     }
1232 }
1233
1234 void FGJSBsim::update_external_forces(double t_off)
1235 {
1236     const FGMatrix33& Tb2l = Propagate->GetTb2l();
1237     const FGMatrix33& Tl2b = Propagate->GetTl2b();
1238     const FGLocation& Location = Propagate->GetLocation();
1239     const FGMatrix33& Tec2l = Location.GetTec2l();
1240
1241     double hook_area[4][3];
1242
1243     FGColumnVector3 hook_root_body = MassBalance->StructuralToBody(hook_root_struct);
1244     FGColumnVector3 hook_root = Location.LocalToLocation(Tb2l *   hook_root_body);
1245     hook_area[1][0] = hook_root(1);
1246     hook_area[1][1] = hook_root(2);
1247     hook_area[1][2] = hook_root(3);
1248
1249     hook_length = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-length-ft", 6.75);
1250     double fi_min = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-min-deg", -18);
1251     double fi_max = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-max-deg", 30);
1252     double fi = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-norm") * (fi_max - fi_min) + fi_min;
1253     double cos_fi = cos(fi * SG_DEGREES_TO_RADIANS);
1254     double sin_fi = sin(fi * SG_DEGREES_TO_RADIANS);
1255
1256     FGColumnVector3 hook_tip_body = hook_root_body;
1257     hook_tip_body(1) -= hook_length * cos_fi;
1258     hook_tip_body(3) += hook_length * sin_fi;
1259     bool hook_tip_valid = true;
1260
1261     double contact[3];
1262     double ground_normal[3];
1263     double ground_vel[3];
1264     double root_agl_ft;
1265
1266     if (!got_wire) {
1267         bool got = get_agl_ft(t_off, hook_area[1], 0, contact, ground_normal, ground_vel, &root_agl_ft);
1268         if (got && root_agl_ft > 0 && root_agl_ft < hook_length) {
1269             FGColumnVector3 ground_normal_body = Tl2b * (Tec2l * FGColumnVector3(ground_normal[0], ground_normal[1], ground_normal[2]));
1270             FGColumnVector3 contact_body = Tl2b * Location.LocationToLocal(FGColumnVector3(contact[0], contact[1], contact[2]));
1271             double D = -dot3(contact_body, ground_normal_body);
1272
1273             // check hook tip agl against same ground plane
1274             double hook_tip_agl_ft = dot3(hook_tip_body, ground_normal_body) + D;
1275             if (hook_tip_agl_ft < 0) {
1276
1277                 // hook tip: hx - l cos, hy, hz + l sin
1278                 // on ground:  - n0 l cos + n2 l sin + E = 0
1279
1280                 double E = D + dot3(hook_root_body, ground_normal_body);
1281
1282                 // substitue x = sin fi, cos fi = sqrt(1 - x * x)
1283                 // and rearrange to get a quadratic with coeffs:
1284                 double a = sqr(hook_length) * (sqr(ground_normal_body(1)) + sqr(ground_normal_body(3)));
1285                 double b = 2 * E * ground_normal_body(3) * hook_length;
1286                 double c = sqr(E) - sqr(ground_normal_body(1) * hook_length);
1287
1288                 double disc = sqr(b) - 4 * a * c;
1289                 if (disc >= 0) {
1290                     double delta = sqrt(disc) / (2 * a);
1291
1292                     // allow 4 solutions for safety, should never happen
1293                     double sin_fis[4];
1294                     double cos_fis[4];
1295                     double fis[4];
1296                     int points = 0;
1297
1298                     double sin_fi_guess = -b / (2 * a) - delta;
1299                     check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, sin_fis, cos_fis, fis, &points);
1300                     check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess + 2 * delta, sin_fis, cos_fis, fis, &points);
1301
1302                     if (points == 2) {
1303                         double diff1 = angle_diff(fi, fis[0]);
1304                         double diff2 = angle_diff(fi, fis[1]);
1305                         int point = diff1 < diff2 ? 0 : 1;
1306                         fi = fis[point];
1307                         sin_fi = sin_fis[point];
1308                         cos_fi = cos_fis[point];
1309                         hook_tip_body(1) = hook_root_body(1) - hook_length * cos_fi;
1310                         hook_tip_body(3) = hook_root_body(3) + hook_length * sin_fi;
1311                     }
1312                 }
1313             }
1314         }
1315     } else {
1316         FGColumnVector3 hook_root_vel = Propagate->GetVel() + (Tb2l * (Propagate->GetPQR() *  hook_root_body));
1317         double wire_ends_ec[2][3];
1318         double wire_vel_ec[2][3];
1319         get_wire_ends_ft(t_off, wire_ends_ec, wire_vel_ec);
1320         FGColumnVector3 wire_vel_1 = Tec2l * FGColumnVector3(wire_vel_ec[0][0], wire_vel_ec[0][1], wire_vel_ec[0][2]);
1321         FGColumnVector3 wire_vel_2 = Tec2l * FGColumnVector3(wire_vel_ec[1][0], wire_vel_ec[1][1], wire_vel_ec[1][2]);
1322         FGColumnVector3 rel_vel = hook_root_vel - (wire_vel_1 + wire_vel_2) / 2;
1323         if (rel_vel.Magnitude() < 3) {
1324             got_wire = false;
1325             release_wire();
1326             fgSetDouble("/fdm/jsbsim/external_reactions/hook/magnitude", 0.0);
1327         } else {
1328             FGColumnVector3 wire_end1_body = Tl2b * Location.LocationToLocal(FGColumnVector3(wire_ends_ec[0][0], wire_ends_ec[0][1], wire_ends_ec[0][2])) - hook_root_body;
1329             FGColumnVector3 wire_end2_body = Tl2b * Location.LocationToLocal(FGColumnVector3(wire_ends_ec[1][0], wire_ends_ec[1][1], wire_ends_ec[1][2])) - hook_root_body;
1330             FGColumnVector3 force_plane_normal = wire_end1_body * wire_end2_body;
1331             force_plane_normal.Normalize();
1332             cos_fi = dot3(force_plane_normal, FGColumnVector3(0, 0, 1));
1333             if (cos_fi < 0) cos_fi = -cos_fi;
1334             sin_fi = sqrt(1 - sqr(cos_fi));
1335             fi = atan2(sin_fi, cos_fi) * SG_RADIANS_TO_DEGREES;
1336
1337             fgSetDouble("/fdm/jsbsim/external_reactions/hook/x", -cos_fi);
1338             fgSetDouble("/fdm/jsbsim/external_reactions/hook/y", 0);
1339             fgSetDouble("/fdm/jsbsim/external_reactions/hook/z", sin_fi);
1340             fgSetDouble("/fdm/jsbsim/external_reactions/hook/magnitude", fgGetDouble("/fdm/jsbsim/systems/hook/force"));
1341         }
1342     }
1343
1344     FGColumnVector3 hook_tip = Location.LocalToLocation(Tb2l * hook_tip_body);
1345
1346     hook_area[0][0] = hook_tip(1);
1347     hook_area[0][1] = hook_tip(2);
1348     hook_area[0][2] = hook_tip(3);
1349
1350     if (!got_wire) {
1351         // The previous positions.
1352         hook_area[2][0] = last_hook_root[0];
1353         hook_area[2][1] = last_hook_root[1];
1354         hook_area[2][2] = last_hook_root[2];
1355         hook_area[3][0] = last_hook_tip[0];
1356         hook_area[3][1] = last_hook_tip[1];
1357         hook_area[3][2] = last_hook_tip[2];
1358
1359         // Check if we caught a wire.
1360         // Returns true if we caught one.
1361         if (caught_wire_ft(t_off, hook_area)) {
1362                 got_wire = true;
1363         }
1364     }
1365
1366     // save actual position as old position ...
1367     last_hook_tip[0] = hook_area[0][0];
1368     last_hook_tip[1] = hook_area[0][1];
1369     last_hook_tip[2] = hook_area[0][2];
1370     last_hook_root[0] = hook_area[1][0];
1371     last_hook_root[1] = hook_area[1][1];
1372     last_hook_root[2] = hook_area[1][2];
1373
1374     fgSetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-deg", fi);
1375 }
1376