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 #ifdef SG_MATH_EXCEPTION_CLASH
  31 #  include <math.h>
  32 #endif
  33
  34 #include STL_STRING
  35
  36 #include <simgear/constants.h>
  37 #include <simgear/debug/logstream.hxx>
  38 #include <simgear/math/sg_geodesy.hxx>
  39 #include <simgear/misc/sg_path.hxx>
  40
  41 #include <FDM/flight.hxx>
  42
  43 #include <Aircraft/aircraft.hxx>
  44 #include <Controls/controls.hxx>
  45 #include <Main/globals.hxx>
  46 #include <Main/fg_props.hxx>
  47
  48 #include <FDM/JSBSim/FGFDMExec.h>
  49 #include <FDM/JSBSim/FGAircraft.h>
  50 #include <FDM/JSBSim/FGFCS.h>
  51 #include <FDM/JSBSim/FGPosition.h>
  52 #include <FDM/JSBSim/FGRotation.h>
  53 #include <FDM/JSBSim/FGState.h>
  54 #include <FDM/JSBSim/FGTranslation.h>
  55 #include <FDM/JSBSim/FGAuxiliary.h>
  56 #include <FDM/JSBSim/FGInitialCondition.h>
  57 #include <FDM/JSBSim/FGTrim.h>
  58 #include <FDM/JSBSim/FGAtmosphere.h>
  59 #include <FDM/JSBSim/FGMassBalance.h>
  60 #include <FDM/JSBSim/FGAerodynamics.h>
  61 #include <FDM/JSBSim/FGLGear.h>
  62 #include <FDM/JSBSim/FGPropertyManager.h>
  63 #include "JSBSim.hxx"
  64
  65 static inline double
  66 FMAX (double a, double b)
  67 {
  68   return a > b ? a : b;
  69 }
  70
  71
  72 /******************************************************************************/
  73
  74 FGJSBsim::FGJSBsim( double dt )
  75   : FGInterface(dt)
  76 {
  77     bool result;
  78
  79     fdmex = new FGFDMExec( (FGPropertyManager*)globals->get_props() );
  80
  81     State           = fdmex->GetState();
  82     Atmosphere      = fdmex->GetAtmosphere();
  83     FCS             = fdmex->GetFCS();
  84     MassBalance     = fdmex->GetMassBalance();
  85     Propulsion      = fdmex->GetPropulsion();
  86     Aircraft        = fdmex->GetAircraft();
  87     Translation     = fdmex->GetTranslation();
  88     Rotation        = fdmex->GetRotation();
  89     Position        = fdmex->GetPosition();
  90     Auxiliary       = fdmex->GetAuxiliary();
  91     Aerodynamics    = fdmex->GetAerodynamics();
  92     GroundReactions = fdmex->GetGroundReactions();
  93
  94     fgic=fdmex->GetIC();
  95     needTrim=true;
  96
  97     SGPath aircraft_path( globals->get_fg_root() );
  98     aircraft_path.append( "Aircraft" );
  99
 100     SGPath engine_path( globals->get_fg_root() );
 101     engine_path.append( "Engine" );
 102     State->Setdt( dt );
 103
 104     result = fdmex->LoadModel( aircraft_path.str(),
 105                                engine_path.str(),
 106                                fgGetString("/sim/aero") );
 107
 108     if (result) {
 109       SG_LOG( SG_FLIGHT, SG_INFO, "  loaded aero.");
 110     } else {
 111       SG_LOG( SG_FLIGHT, SG_INFO,
 112               "  aero does not exist (you may have mis-typed the name).");
 113       throw(-1);
 114     }
 115
 116     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 117     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 118     SG_LOG( SG_FLIGHT, SG_INFO, "After loading aero definition file ..." );
 119
 120     int Neng = Propulsion->GetNumEngines();
 121     SG_LOG( SG_FLIGHT, SG_INFO, "num engines = " << Neng );
 122
 123     if ( GroundReactions->GetNumGearUnits() <= 0 ) {
 124         SG_LOG( SG_FLIGHT, SG_ALERT, "num gear units = "
 125                 << GroundReactions->GetNumGearUnits() );
 126         SG_LOG( SG_FLIGHT, SG_ALERT, "This is a very bad thing because with 0 gear units, the ground trimming");
 127          SG_LOG( SG_FLIGHT, SG_ALERT, "routine (coming up later in the code) will core dump.");
 128          SG_LOG( SG_FLIGHT, SG_ALERT, "Halting the sim now, and hoping a solution will present itself soon!");
 129          exit(-1);
 130     }
 131
 132
 133     init_gear();
 134
 135                                 // Set initial fuel levels if provided.
 136     for (unsigned int i = 0; i < Propulsion->GetNumTanks(); i++) {
 137       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 138       if (node->getChild("level-gal_us", 0, false) != 0)
 139         Propulsion->GetTank(i)
 140           ->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 141     }
 142
 143     fgSetDouble("/fdm/trim/pitch-trim", FCS->GetPitchTrimCmd());
 144     fgSetDouble("/fdm/trim/throttle",   FCS->GetThrottleCmd(0));
 145     fgSetDouble("/fdm/trim/aileron",    FCS->GetDaCmd());
 146     fgSetDouble("/fdm/trim/rudder",     FCS->GetDrCmd());
 147
 148     startup_trim = fgGetNode("/sim/presets/trim", true);
 149
 150     trimmed = fgGetNode("/fdm/trim/trimmed", true);
 151     trimmed->setBoolValue(false);
 152
 153     pitch_trim = fgGetNode("/fdm/trim/pitch-trim", true );
 154     throttle_trim = fgGetNode("/fdm/trim/throttle", true );
 155     aileron_trim = fgGetNode("/fdm/trim/aileron", true );
 156     rudder_trim = fgGetNode("/fdm/trim/rudder", true );
 157
 158     stall_warning = fgGetNode("/sim/alarms/stall-warning",true);
 159     stall_warning->setDoubleValue(0);
 160
 161
 162     flap_pos_pct=fgGetNode("/surface-positions/flap-pos-norm",true);
 163     elevator_pos_pct=fgGetNode("/surface-positions/elevator-pos-norm",true);
 164     left_aileron_pos_pct
 165         =fgGetNode("/surface-positions/left-aileron-pos-norm",true);
 166     right_aileron_pos_pct
 167         =fgGetNode("/surface-positions/right-aileron-pos-norm",true);
 168     rudder_pos_pct=fgGetNode("/surface-positions/rudder-pos-norm",true);
 169     speedbrake_pos_pct
 170         =fgGetNode("/surface-positions/speedbrake-pos-norm",true);
 171     spoilers_pos_pct=fgGetNode("/surface-positions/spoilers-pos-norm",true);
 172
 173
 174     elevator_pos_pct->setDoubleValue(0);
 175     left_aileron_pos_pct->setDoubleValue(0);
 176     right_aileron_pos_pct->setDoubleValue(0);
 177     rudder_pos_pct->setDoubleValue(0);
 178     flap_pos_pct->setDoubleValue(0);
 179     speedbrake_pos_pct->setDoubleValue(0);
 180     spoilers_pos_pct->setDoubleValue(0);
 181
 182     temperature = fgGetNode("/environment/temperature-degc",true);
 183     pressure = fgGetNode("/environment/pressure-inhg",true);
 184     density = fgGetNode("/environment/density-slugft3",true);
 185     turbulence = fgGetNode("environment/turbulence-norm",true);
 186
 187     wind_from_north= fgGetNode("/environment/wind-from-north-fps",true);
 188     wind_from_east = fgGetNode("/environment/wind-from-east-fps" ,true);
 189     wind_from_down = fgGetNode("/environment/wind-from-down-fps" ,true);
 190
 191
 192 }
 193 /******************************************************************************/
 194 FGJSBsim::~FGJSBsim(void) {
 195         delete fdmex;
 196 }
 197
 198 /******************************************************************************/
 199
 200 // Initialize the JSBsim flight model, dt is the time increment for
 201 // each subsequent iteration through the EOM
 202
 203 void FGJSBsim::init() {
 204
 205     SG_LOG( SG_FLIGHT, SG_INFO, "Starting and initializing JSBsim" );
 206
 207     // Explicitly call the superclass's
 208     // init method first.
 209
 210 #ifdef FG_WEATHERCM
 211     Atmosphere->UseInternal();
 212 #else
 213     if (fgGetBool("/environment/params/control-fdm-atmosphere")) {
 214       Atmosphere->UseExternal();
 215       Atmosphere->SetExTemperature(
 216                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 217       Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 218       Atmosphere->SetExDensity(density->getDoubleValue());
 219       Atmosphere->SetTurbGain(turbulence->getDoubleValue() *
 220                               turbulence->getDoubleValue() *
 221                               100.0);
 222     } else {
 223       Atmosphere->UseInternal();
 224     }
 225 #endif
 226
 227     fgic->SetVnorthFpsIC( wind_from_north->getDoubleValue() );
 228     fgic->SetVeastFpsIC( wind_from_east->getDoubleValue() );
 229     fgic->SetVdownFpsIC( wind_from_down->getDoubleValue() );
 230
 231     //Atmosphere->SetExTemperature(get_Static_temperature());
 232     //Atmosphere->SetExPressure(get_Static_pressure());
 233     //Atmosphere->SetExDensity(get_Density());
 234     SG_LOG(SG_FLIGHT,SG_INFO,"T,p,rho: " << fdmex->GetAtmosphere()->GetTemperature()
 235      << ", " << fdmex->GetAtmosphere()->GetPressure()
 236      << ", " << fdmex->GetAtmosphere()->GetDensity() );
 237
 238     common_init();
 239     copy_to_JSBsim();
 240
 241
 242     fdmex->RunIC(); //loop JSBSim once w/o integrating
 243     copy_from_JSBsim(); //update the bus
 244
 245     SG_LOG( SG_FLIGHT, SG_INFO, "  Initialized JSBSim with:" );
 246
 247     switch(fgic->GetSpeedSet()) {
 248     case setned:
 249         SG_LOG(SG_FLIGHT,SG_INFO, "  Vn,Ve,Vd= "
 250                << Position->GetVn() << ", "
 251                << Position->GetVe() << ", "
 252                << Position->GetVd() << " ft/s");
 253     break;
 254     case setuvw:
 255         SG_LOG(SG_FLIGHT,SG_INFO, "  U,V,W= "
 256                << Translation->GetUVW(1) << ", "
 257                << Translation->GetUVW(2) << ", "
 258                << Translation->GetUVW(3) << " ft/s");
 259     break;
 260     case setmach:
 261         SG_LOG(SG_FLIGHT,SG_INFO, "  Mach: "
 262                << Translation->GetMach() );
 263     break;
 264     case setvc:
 265     default:
 266         SG_LOG(SG_FLIGHT,SG_INFO, "  Indicated Airspeed: "
 267                << Auxiliary->GetVcalibratedKTS() << " knots" );
 268     break;
 269     }
 270
 271     stall_warning->setDoubleValue(0);
 272
 273     SG_LOG( SG_FLIGHT, SG_INFO, "  Bank Angle: "
 274             <<  Rotation->Getphi()*RADTODEG << " deg" );
 275     SG_LOG( SG_FLIGHT, SG_INFO, "  Pitch Angle: "
 276             << Rotation->Gettht()*RADTODEG << " deg" );
 277     SG_LOG( SG_FLIGHT, SG_INFO, "  True Heading: "
 278             << Rotation->Getpsi()*RADTODEG << " deg" );
 279     SG_LOG( SG_FLIGHT, SG_INFO, "  Latitude: "
 280             << Position->GetLatitude() << " deg" );
 281     SG_LOG( SG_FLIGHT, SG_INFO, "  Longitude: "
 282             << Position->GetLongitude() << " deg" );
 283     SG_LOG( SG_FLIGHT, SG_INFO, "  Altitude: "
 284         << Position->Geth() << " feet" );
 285     SG_LOG( SG_FLIGHT, SG_INFO, "  loaded initial conditions" );
 286
 287     SG_LOG( SG_FLIGHT, SG_INFO, "  set dt" );
 288
 289     SG_LOG( SG_FLIGHT, SG_INFO, "Finished initializing JSBSim" );
 290
 291     SG_LOG( SG_FLIGHT, SG_INFO, "FGControls::get_gear_down()= " <<
 292                                   globals->get_controls()->get_gear_down() );
 293
 294
 295
 296 }
 297
 298 /******************************************************************************/
 299
 300 // Run an iteration of the EOM (equations of motion)
 301
 302 void
 303 FGJSBsim::update( double dt ) {
 304
 305     if (is_suspended())
 306       return;
 307
 308     int multiloop = _calc_multiloop(dt);
 309
 310     int i;
 311
 312     // double save_alt = 0.0;
 313
 314     copy_to_JSBsim();
 315
 316     trimmed->setBoolValue(false);
 317
 318     if ( needTrim ) {
 319       if ( startup_trim->getBoolValue() ) {
 320         SG_LOG(SG_FLIGHT, SG_INFO,
 321           "Ready to trim, terrain altitude is: "
 322             << cur_fdm_state->get_Runway_altitude() * SG_METER_TO_FEET );
 323         fgic->SetTerrainAltitudeFtIC( cur_fdm_state->get_ground_elev_ft() );
 324         do_trim();
 325       } else {
 326         fdmex->RunIC();  //apply any changes made through the set_ functions
 327       }
 328       needTrim = false;
 329     }
 330
 331     for ( i=0; i < multiloop; i++ ) {
 332         fdmex->Run();
 333     }
 334
 335     FGJSBBase::Message* msg;
 336     while (fdmex->ReadMessage()) {
 337       msg = fdmex->ProcessMessage();
 338       switch (msg->type) {
 339       case FGJSBBase::Message::eText:
 340         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text );
 341         break;
 342       case FGJSBBase::Message::eBool:
 343         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->bVal );
 344         break;
 345       case FGJSBBase::Message::eInteger:
 346         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->iVal );
 347         break;
 348       case FGJSBBase::Message::eDouble:
 349         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->dVal );
 350         break;
 351       default:
 352         SG_LOG( SG_FLIGHT, SG_INFO, "Unrecognized message type." );
 353         break;
 354       }
 355     }
 356
 357     // translate JSBsim back to FG structure so that the
 358     // autopilot (and the rest of the sim can use the updated values
 359     copy_from_JSBsim();
 360 }
 361
 362 /******************************************************************************/
 363
 364 // Convert from the FGInterface struct to the JSBsim generic_ struct
 365
 366 bool FGJSBsim::copy_to_JSBsim() {
 367     unsigned int i;
 368
 369     // copy control positions into the JSBsim structure
 370
 371     FCS->SetDaCmd( globals->get_controls()->get_aileron());
 372     FCS->SetRollTrimCmd( globals->get_controls()->get_aileron_trim() );
 373     FCS->SetDeCmd( globals->get_controls()->get_elevator());
 374     FCS->SetPitchTrimCmd( globals->get_controls()->get_elevator_trim() );
 375     FCS->SetDrCmd( -globals->get_controls()->get_rudder() );
 376     FCS->SetYawTrimCmd( -globals->get_controls()->get_rudder_trim() );
 377     FCS->SetDfCmd(  globals->get_controls()->get_flaps() );
 378     FCS->SetDsbCmd( globals->get_controls()->get_speedbrake() );
 379     FCS->SetDspCmd( globals->get_controls()->get_spoilers() );
 380
 381                                 // Parking brake sets minimum braking
 382                                 // level for mains.
 383     double parking_brake = globals->get_controls()->get_parking_brake();
 384     FCS->SetLBrake(FMAX(globals->get_controls()->get_brake(0), parking_brake));
 385     FCS->SetRBrake(FMAX(globals->get_controls()->get_brake(1), parking_brake));
 386     FCS->SetCBrake( globals->get_controls()->get_brake(2) );
 387
 388     FCS->SetGearCmd( globals->get_controls()->get_gear_down());
 389     for (i = 0; i < Propulsion->GetNumEngines(); i++) {
 390       FGEngine * eng = Propulsion->GetEngine(i);
 391       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 392       FCS->SetThrottleCmd(i, globals->get_controls()->get_throttle(i));
 393       FCS->SetMixtureCmd(i, globals->get_controls()->get_mixture(i));
 394       FCS->SetPropAdvanceCmd(i, globals->get_controls()->get_prop_advance(i));
 395       Propulsion->GetThruster(i)->SetRPM(node->getDoubleValue("rpm"));
 396       eng->SetMagnetos( globals->get_controls()->get_magnetos(i) );
 397       eng->SetStarter( globals->get_controls()->get_starter(i) );
 398       eng->SetAugmentation( globals->get_controls()->get_augmentation(i) );
 399       eng->SetReverse( globals->get_controls()->get_reverser(i) );
 400       eng->SetInjection( globals->get_controls()->get_water_injection(i) );
 401       eng->SetIgnition( globals->get_controls()->get_ignition(i) );
 402       eng->SetCutoff( globals->get_controls()->get_cutoff(i) );
 403       eng->SetNitrous( globals->get_controls()->get_nitrous_injection(i) );
 404     }
 405
 406     _set_Runway_altitude( cur_fdm_state->get_Runway_altitude() );
 407     Position->SetSeaLevelRadius( get_Sea_level_radius() );
 408     Position->SetRunwayRadius( get_Runway_altitude()
 409                                + get_Sea_level_radius() );
 410
 411     Atmosphere->SetExTemperature(
 412                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 413     Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 414     Atmosphere->SetExDensity(density->getDoubleValue());
 415     Atmosphere->SetTurbGain(turbulence->getDoubleValue() *
 416                             turbulence->getDoubleValue() *
 417                             100.0);
 418
 419     Atmosphere->SetWindNED( wind_from_north->getDoubleValue(),
 420                             wind_from_east->getDoubleValue(),
 421                             wind_from_down->getDoubleValue() );
 422 //    SG_LOG(SG_FLIGHT,SG_INFO, "Wind NED: "
 423 //                  << get_V_north_airmass() << ", "
 424 //                  << get_V_east_airmass()  << ", "
 425 //                  << get_V_down_airmass() );
 426
 427     for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 428       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 429       FGTank * tank = Propulsion->GetTank(i);
 430       tank->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 431 //       tank->SetContents(node->getDoubleValue("level-lb"));
 432     }
 433
 434     return true;
 435 }
 436
 437 /******************************************************************************/
 438
 439 // Convert from the JSBsim generic_ struct to the FGInterface struct
 440
 441 bool FGJSBsim::copy_from_JSBsim() {
 442     unsigned int i, j;
 443
 444     _set_Inertias( MassBalance->GetMass(),
 445                    MassBalance->GetIxx(),
 446                    MassBalance->GetIyy(),
 447                    MassBalance->GetIzz(),
 448                    MassBalance->GetIxz() );
 449
 450     _set_CG_Position( MassBalance->GetXYZcg(1),
 451                       MassBalance->GetXYZcg(2),
 452                       MassBalance->GetXYZcg(3) );
 453
 454     _set_Accels_Body( Aircraft->GetBodyAccel()(1),
 455                       Aircraft->GetBodyAccel()(2),
 456                       Aircraft->GetBodyAccel()(3) );
 457
 458     //_set_Accels_CG_Body( Aircraft->GetBodyAccel()(1),
 459     //                     Aircraft->GetBodyAccel()(2),
 460     //                     Aircraft->GetBodyAccel()(3) );
 461     //
 462     _set_Accels_CG_Body_N ( Aircraft->GetNcg()(1),
 463                             Aircraft->GetNcg()(2),
 464                             Aircraft->GetNcg()(3) );
 465
 466     _set_Accels_Pilot_Body( Auxiliary->GetPilotAccel()(1),
 467                             Auxiliary->GetPilotAccel()(2),
 468                             Auxiliary->GetPilotAccel()(3) );
 469
 470    // _set_Accels_Pilot_Body_N( Auxiliary->GetPilotAccel()(1)/32.1739,
 471    //                           Auxiliary->GetNpilot(2)/32.1739,
 472    //                           Auxiliary->GetNpilot(3)/32.1739 );
 473
 474     _set_Nlf( Aircraft->GetNlf() );
 475
 476     // Velocities
 477
 478     _set_Velocities_Local( Position->GetVn(),
 479                            Position->GetVe(),
 480                            Position->GetVd() );
 481
 482     _set_Velocities_Wind_Body( Translation->GetUVW(1),
 483                                Translation->GetUVW(2),
 484                                Translation->GetUVW(3) );
 485
 486     _set_V_rel_wind( Translation->GetVt() );
 487
 488     _set_V_equiv_kts( Auxiliary->GetVequivalentKTS() );
 489
 490     // _set_V_calibrated( Auxiliary->GetVcalibratedFPS() );
 491
 492     _set_V_calibrated_kts( Auxiliary->GetVcalibratedKTS() );
 493
 494     _set_V_ground_speed( Position->GetVground() );
 495
 496     _set_Omega_Body( Rotation->GetPQR(1),
 497                      Rotation->GetPQR(2),
 498                      Rotation->GetPQR(3) );
 499
 500     _set_Euler_Rates( Rotation->GetEulerRates(1),
 501                       Rotation->GetEulerRates(2),
 502                       Rotation->GetEulerRates(3) );
 503
 504     _set_Geocentric_Rates(Position->GetLatitudeDot(),
 505                           Position->GetLongitudeDot(),
 506                           Position->Gethdot() );
 507
 508     _set_Mach_number( Translation->GetMach() );
 509
 510     // Positions
 511     _updateGeocentricPosition( Position->GetLatitude(),
 512                                Position->GetLongitude(),
 513                                Position->Geth() );
 514
 515     _set_Altitude_AGL( Position->GetDistanceAGL() );
 516
 517     _set_Euler_Angles( Rotation->Getphi(),
 518                        Rotation->Gettht(),
 519                        Rotation->Getpsi() );
 520
 521     _set_Alpha( Translation->Getalpha() );
 522     _set_Beta( Translation->Getbeta() );
 523
 524
 525     _set_Gamma_vert_rad( Position->GetGamma() );
 526     // set_Gamma_horiz_rad( Gamma_horiz_rad );
 527
 528     _set_Earth_position_angle( Auxiliary->GetEarthPositionAngle() );
 529
 530     _set_Climb_Rate( Position->Gethdot() );
 531
 532
 533     for ( i = 1; i <= 3; i++ ) {
 534         for ( j = 1; j <= 3; j++ ) {
 535             _set_T_Local_to_Body( i, j, State->GetTl2b(i,j) );
 536         }
 537     }
 538
 539                                 // Copy the engine values from JSBSim.
 540     for( i=0; i < Propulsion->GetNumEngines(); i++ ) {
 541       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 542       FGEngine * eng = Propulsion->GetEngine(i);
 543       FGThruster * thrust = Propulsion->GetThruster(i);
 544
 545       node->setDoubleValue("mp-osi", eng->getManifoldPressure_inHg());
 546       node->setDoubleValue("rpm", thrust->GetRPM());
 547       node->setDoubleValue("egt-degf", eng->getExhaustGasTemp_degF());
 548       node->setDoubleValue("fuel-flow-gph", eng->getFuelFlow_gph());
 549       node->setDoubleValue("cht-degf", eng->getCylinderHeadTemp_degF());
 550       node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
 551       node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 552       node->setDoubleValue("thrust_lb", eng->GetThrust());
 553       node->setDoubleValue("N1", eng->GetN1());
 554       node->setDoubleValue("N2", eng->GetN2());
 555       node->setDoubleValue("EGT_degC", eng->GetEGT());
 556       node->setDoubleValue("fuel-flow_pph", eng->getFuelFlow_pph());
 557       node->setDoubleValue("nozzle-pos-norm", eng->GetNozzle());
 558       node->setDoubleValue("inlet-pos-norm", eng->GetInlet());
 559       node->setBoolValue("running", eng->GetRunning());
 560       node->setBoolValue("cranking", eng->GetCranking());
 561       node->setBoolValue("ignition", eng->GetIgnition());
 562       node->setBoolValue("augmentation", eng->GetAugmentation());
 563       node->setBoolValue("water-injection", eng->GetInjection());
 564       node->setBoolValue("reversed", eng->GetReversed());
 565       node->setBoolValue("cutoff", eng->GetCutoff());
 566       node->setBoolValue("nitrous", eng->GetNitrous());
 567     }
 568
 569     static const SGPropertyNode *fuel_freeze
 570         = fgGetNode("/sim/freeze/fuel");
 571
 572                                 // Copy the fuel levels from JSBSim if fuel
 573                                 // freeze not enabled.
 574     if ( ! fuel_freeze->getBoolValue() ) {
 575         for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 576             SGPropertyNode * node
 577                 = fgGetNode("/consumables/fuel/tank", i, true);
 578             double contents = Propulsion->GetTank(i)->GetContents();
 579             node->setDoubleValue("level-gal_us", contents/6.6);
 580             node->setDoubleValue("level-lb", contents);
 581             // node->setDoubleValue("temperature_degC",
 582         }
 583     }
 584
 585     update_gear();
 586
 587     stall_warning->setDoubleValue( Aerodynamics->GetStallWarn() );
 588
 589     /* elevator_pos_deg->setDoubleValue( FCS->GetDePos()*SG_RADIANS_TO_DEGREES );
 590     left_aileron_pos_deg->setDoubleValue( FCS->GetDaLPos()*SG_RADIANS_TO_DEGREES );
 591     right_aileron_pos_deg->setDoubleValue( FCS->GetDaRPos()*SG_RADIANS_TO_DEGREES );
 592     rudder_pos_deg->setDoubleValue( -1*FCS->GetDrPos()*SG_RADIANS_TO_DEGREES );
 593     flap_pos_deg->setDoubleValue( FCS->GetDfPos() ); */
 594
 595
 596     elevator_pos_pct->setDoubleValue( FCS->GetDePos(ofNorm) );
 597     left_aileron_pos_pct->setDoubleValue( FCS->GetDaLPos(ofNorm) );
 598     right_aileron_pos_pct->setDoubleValue( -1*FCS->GetDaLPos(ofNorm) );
 599     rudder_pos_pct->setDoubleValue( -1*FCS->GetDrPos(ofNorm) );
 600     flap_pos_pct->setDoubleValue( FCS->GetDfPos(ofNorm) );
 601     speedbrake_pos_pct->setDoubleValue( FCS->GetDsbPos(ofNorm) );
 602     spoilers_pos_pct->setDoubleValue( FCS->GetDspPos(ofNorm) );
 603
 604
 605     return true;
 606 }
 607
 608 bool FGJSBsim::ToggleDataLogging(void) {
 609     return fdmex->GetOutput()->Toggle();
 610 }
 611
 612
 613 bool FGJSBsim::ToggleDataLogging(bool state) {
 614     if (state) {
 615       fdmex->GetOutput()->Enable();
 616       return true;
 617     } else {
 618       fdmex->GetOutput()->Disable();
 619       return false;
 620     }
 621 }
 622
 623
 624 //Positions
 625 void FGJSBsim::set_Latitude(double lat) {
 626     static const SGPropertyNode *altitude = fgGetNode("/position/altitude-ft");
 627     double alt;
 628     double sea_level_radius_meters, lat_geoc;
 629
 630                                 // In case we're not trimming
 631     FGInterface::set_Latitude(lat);
 632
 633     if ( altitude->getDoubleValue() > -9990 ) {
 634       alt = altitude->getDoubleValue();
 635     } else {
 636       alt = 0.0;
 637     }
 638
 639     update_ic();
 640     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Latitude: " << lat );
 641     SG_LOG(SG_FLIGHT,SG_INFO," cur alt (ft) =  " << alt );
 642
 643     sgGeodToGeoc( lat, alt * SG_FEET_TO_METER,
 644                       &sea_level_radius_meters, &lat_geoc );
 645     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
 646     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET  );
 647     _set_Runway_altitude( cur_fdm_state->get_Runway_altitude() );
 648     fgic->SetTerrainAltitudeFtIC( cur_fdm_state->get_ground_elev_ft() );
 649     fgic->SetLatitudeRadIC( lat_geoc );
 650     needTrim=true;
 651 }
 652
 653 void FGJSBsim::set_Longitude(double lon) {
 654
 655     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Longitude: " << lon );
 656
 657                                 // In case we're not trimming
 658     FGInterface::set_Longitude(lon);
 659
 660     update_ic();
 661     fgic->SetLongitudeRadIC( lon );
 662     _set_Runway_altitude( cur_fdm_state->get_Runway_altitude() );
 663     fgic->SetTerrainAltitudeFtIC( cur_fdm_state->get_ground_elev_ft() );
 664     needTrim=true;
 665 }
 666
 667 void FGJSBsim::set_Altitude(double alt) {
 668     static const SGPropertyNode *latitude = fgGetNode("/position/latitude-deg");
 669
 670     double sea_level_radius_meters,lat_geoc;
 671
 672     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Altitude: " << alt );
 673     SG_LOG(SG_FLIGHT,SG_INFO, "  lat (deg) = " << latitude->getDoubleValue() );
 674
 675                                 // In case we're not trimming
 676     FGInterface::set_Altitude(alt);
 677
 678     update_ic();
 679     sgGeodToGeoc( latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS, alt,
 680                   &sea_level_radius_meters, &lat_geoc);
 681     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
 682     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET );
 683     _set_Runway_altitude( cur_fdm_state->get_Runway_altitude() );
 684     fgic->SetTerrainAltitudeFtIC( cur_fdm_state->get_ground_elev_ft() );
 685     SG_LOG(SG_FLIGHT, SG_INFO,
 686           "Terrain altitude: " << cur_fdm_state->get_Runway_altitude() * SG_METER_TO_FEET );
 687     fgic->SetLatitudeRadIC( lat_geoc );
 688     fgic->SetAltitudeFtIC(alt);
 689     needTrim=true;
 690 }
 691
 692 void FGJSBsim::set_V_calibrated_kts(double vc) {
 693     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_V_calibrated_kts: " <<  vc );
 694
 695                                 // In case we're not trimming
 696     FGInterface::set_V_calibrated_kts(vc);
 697
 698     update_ic();
 699     fgic->SetVcalibratedKtsIC(vc);
 700     needTrim=true;
 701 }
 702
 703 void FGJSBsim::set_Mach_number(double mach) {
 704     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Mach_number: " <<  mach );
 705
 706                                 // In case we're not trimming
 707     FGInterface::set_Mach_number(mach);
 708
 709     update_ic();
 710     fgic->SetMachIC(mach);
 711     needTrim=true;
 712 }
 713
 714 void FGJSBsim::set_Velocities_Local( double north, double east, double down ){
 715     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Local: "
 716        << north << ", " <<  east << ", " << down );
 717
 718                                 // In case we're not trimming
 719     FGInterface::set_Velocities_Local(north, east, down);
 720
 721     update_ic();
 722     fgic->SetVnorthFpsIC(north);
 723     fgic->SetVeastFpsIC(east);
 724     fgic->SetVdownFpsIC(down);
 725     needTrim=true;
 726 }
 727
 728 void FGJSBsim::set_Velocities_Wind_Body( double u, double v, double w){
 729     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Wind_Body: "
 730        << u << ", " <<  v << ", " <<  w );
 731
 732                                 // In case we're not trimming
 733     FGInterface::set_Velocities_Wind_Body(u, v, w);
 734
 735     update_ic();
 736     fgic->SetUBodyFpsIC(u);
 737     fgic->SetVBodyFpsIC(v);
 738     fgic->SetWBodyFpsIC(w);
 739     needTrim=true;
 740 }
 741
 742 //Euler angles
 743 void FGJSBsim::set_Euler_Angles( double phi, double theta, double psi ) {
 744     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Euler_Angles: "
 745        << phi << ", " << theta << ", " << psi );
 746
 747                                 // In case we're not trimming
 748     FGInterface::set_Euler_Angles(phi, theta, psi);
 749
 750     update_ic();
 751     fgic->SetPitchAngleRadIC(theta);
 752     fgic->SetRollAngleRadIC(phi);
 753     fgic->SetTrueHeadingRadIC(psi);
 754     needTrim=true;
 755 }
 756
 757 //Flight Path
 758 void FGJSBsim::set_Climb_Rate( double roc) {
 759     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Climb_Rate: " << roc );
 760
 761                                 // In case we're not trimming
 762     FGInterface::set_Climb_Rate(roc);
 763
 764     update_ic();
 765     //since both climb rate and flight path angle are set in the FG
 766     //startup sequence, something is needed to keep one from cancelling
 767     //out the other.
 768     if( !(fabs(roc) > 1 && fabs(fgic->GetFlightPathAngleRadIC()) < 0.01) ) {
 769       fgic->SetClimbRateFpsIC(roc);
 770     }
 771     needTrim=true;
 772 }
 773
 774 void FGJSBsim::set_Gamma_vert_rad( double gamma) {
 775     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Gamma_vert_rad: " << gamma );
 776
 777     update_ic();
 778     if( !(fabs(gamma) < 0.01 && fabs(fgic->GetClimbRateFpsIC()) > 1) ) {
 779       fgic->SetFlightPathAngleRadIC(gamma);
 780     }
 781     needTrim=true;
 782 }
 783
 784 void FGJSBsim::init_gear(void ) {
 785
 786     FGGroundReactions* gr=fdmex->GetGroundReactions();
 787     int Ngear=GroundReactions->GetNumGearUnits();
 788     for (int i=0;i<Ngear;i++) {
 789       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
 790       node->setDoubleValue("xoffset-in",
 791                            gr->GetGearUnit(i)->GetBodyLocation()(1));
 792       node->setDoubleValue("yoffset-in",
 793                            gr->GetGearUnit(i)->GetBodyLocation()(2));
 794       node->setDoubleValue("zoffset-in",
 795                            gr->GetGearUnit(i)->GetBodyLocation()(3));
 796       node->setBoolValue("wow", gr->GetGearUnit(i)->GetWOW());
 797       node->setBoolValue("has-brake", gr->GetGearUnit(i)->GetBrakeGroup() > 0);
 798       node->setDoubleValue("position-norm", FCS->GetGearPos());
 799     }
 800 }
 801
 802 void FGJSBsim::update_gear(void) {
 803
 804     FGGroundReactions* gr=fdmex->GetGroundReactions();
 805     int Ngear=GroundReactions->GetNumGearUnits();
 806     for (int i=0;i<Ngear;i++) {
 807       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
 808       node->getChild("wow", 0, true)
 809         ->setBoolValue(gr->GetGearUnit(i)->GetWOW());
 810       node->getChild("position-norm", 0, true)
 811         ->setDoubleValue(FCS->GetGearPos());
 812     }
 813 }
 814
 815 void FGJSBsim::do_trim(void) {
 816
 817         FGTrim *fgtrim;
 818         if( fgGetBool("/sim/presets/onground") ) {
 819             fgic->SetVcalibratedKtsIC(0.0);
 820             fgtrim=new FGTrim(fdmex,tGround);
 821         } else {
 822             fgtrim=new FGTrim(fdmex,tLongitudinal);
 823         }
 824         if( !fgtrim->DoTrim() ) {
 825             fgtrim->Report();
 826             fgtrim->TrimStats();
 827         } else {
 828             trimmed->setBoolValue(true);
 829         }
 830         State->ReportState();
 831         delete fgtrim;
 832         pitch_trim->setDoubleValue( FCS->GetPitchTrimCmd() );
 833         throttle_trim->setDoubleValue( FCS->GetThrottleCmd(0) );
 834         aileron_trim->setDoubleValue( FCS->GetDaCmd() );
 835         rudder_trim->setDoubleValue( FCS->GetDrCmd() );
 836
 837         globals->get_controls()->set_elevator_trim(FCS->GetPitchTrimCmd());
 838         globals->get_controls()->set_elevator(FCS->GetDeCmd());
 839         globals->get_controls()->set_throttle(FGControls::ALL_ENGINES,
 840                                               FCS->GetThrottleCmd(0));
 841
 842         globals->get_controls()->set_aileron(FCS->GetDaCmd());
 843         globals->get_controls()->set_rudder( FCS->GetDrCmd());
 844
 845         SG_LOG( SG_FLIGHT, SG_INFO, "  Trim complete" );
 846 }
 847
 848 void FGJSBsim::update_ic(void) {
 849    if( !needTrim ) {
 850      fgic->SetLatitudeRadIC(get_Lat_geocentric() );
 851      fgic->SetLongitudeRadIC( get_Longitude() );
 852      fgic->SetAltitudeFtIC( get_Altitude() );
 853      fgic->SetVcalibratedKtsIC( get_V_calibrated_kts() );
 854      fgic->SetPitchAngleRadIC( get_Theta() );
 855      fgic->SetRollAngleRadIC( get_Phi() );
 856      fgic->SetTrueHeadingRadIC( get_Psi() );
 857      fgic->SetClimbRateFpsIC( get_Climb_Rate() );
 858    }
 859 }
 860