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 Lesser 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 // Lesser General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU Lesser 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: JSBSim.cxx,v 1.64 2010/10/31 04:49:25 jberndt Exp $
  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/controls.hxx>
  42 #include <Main/globals.hxx>
  43 #include <Main/fg_props.hxx>
  44
  45 #include "JSBSim.hxx"
  46 #include <FDM/JSBSim/FGFDMExec.h>
  47 #include <FDM/JSBSim/FGJSBBase.h>
  48 #include <FDM/JSBSim/initialization/FGInitialCondition.h>
  49 #include <FDM/JSBSim/initialization/FGTrim.h>
  50 #include <FDM/JSBSim/models/FGModel.h>
  51 #include <FDM/JSBSim/models/FGAircraft.h>
  52 #include <FDM/JSBSim/models/FGFCS.h>
  53 #include <FDM/JSBSim/models/FGPropagate.h>
  54 #include <FDM/JSBSim/models/FGAuxiliary.h>
  55 #include <FDM/JSBSim/models/FGInertial.h>
  56 #include <FDM/JSBSim/models/FGAtmosphere.h>
  57 #include <FDM/JSBSim/models/FGMassBalance.h>
  58 #include <FDM/JSBSim/models/FGAerodynamics.h>
  59 #include <FDM/JSBSim/models/FGLGear.h>
  60 #include <FDM/JSBSim/models/FGGroundReactions.h>
  61 #include <FDM/JSBSim/models/FGPropulsion.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, FGColumnVector3& n,
 101                             FGColumnVector3& v, FGColumnVector3& w) const {
 102     double loc_cart[3] = { l(eX), l(eY), l(eZ) };
 103     double contact[3], normal[3], vel[3], angularVel[3], agl = 0;
 104     mInterface->get_agl_ft(t, loc_cart, SG_METER_TO_FEET*2, contact, normal,
 105                            vel, angularVel, &agl);
 106     n = FGColumnVector3( normal[0], normal[1], normal[2] );
 107     v = FGColumnVector3( vel[0], vel[1], vel[2] );
 108     w = FGColumnVector3( angularVel[0], angularVel[1], angularVel[2] );
 109     cont = FGColumnVector3( contact[0], contact[1], contact[2] );
 110     return agl;
 111   }
 112 private:
 113   FGJSBsim* mInterface;
 114 };
 115
 116 /******************************************************************************/
 117
 118 FGJSBsim::FGJSBsim( double dt )
 119   : FGInterface(dt), got_wire(false)
 120 {
 121     bool result;
 122                                 // Set up the debugging level
 123                                 // FIXME: this will not respond to
 124                                 // runtime changes
 125
 126                                 // if flight is excluded, don't bother
 127     if ((logbuf::get_log_classes() & SG_FLIGHT) != 0) {
 128
 129                                 // do a rough-and-ready mapping to
 130                                 // the levels documented in FGFDMExec.h
 131         switch (logbuf::get_log_priority()) {
 132         case SG_BULK:
 133             FGJSBBase::debug_lvl = 0x1f;
 134             break;
 135         case SG_DEBUG:
 136             FGJSBBase::debug_lvl = 0x0f;
 137         case SG_INFO:
 138             FGJSBBase::debug_lvl = 0x01;
 139             break;
 140         case SG_WARN:
 141         case SG_ALERT:
 142             FGJSBBase::debug_lvl = 0x00;
 143             break;
 144         }
 145     }
 146
 147     fdmex = new FGFDMExec( (FGPropertyManager*)globals->get_props() );
 148
 149     // Register ground callback.
 150     fdmex->SetGroundCallback( new FGFSGroundCallback(this) );
 151
 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 // deprecate sim-time-sec for simulation/sim-time-sec
 175 // remove alias with increased configuration file version number (2.1 or later)
 176     SGPropertyNode * node = fgGetNode("/fdm/jsbsim/simulation/sim-time-sec");
 177     fgGetNode("/fdm/jsbsim/sim-time-sec", true)->alias( node );
 178 // end of sim-time-sec deprecation patch
 179
 180     fdmex->Setdt( dt );
 181
 182     result = fdmex->LoadModel( aircraft_path.str(),
 183                                engine_path.str(),
 184                                systems_path.str(),
 185                                fgGetString("/sim/aero"), false );
 186
 187     if (result) {
 188       SG_LOG( SG_FLIGHT, SG_INFO, "  loaded aero.");
 189     } else {
 190       SG_LOG( SG_FLIGHT, SG_INFO,
 191               "  aero does not exist (you may have mis-typed the name).");
 192       throw(-1);
 193     }
 194
 195     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 196     SG_LOG( SG_FLIGHT, SG_INFO, "" );
 197     SG_LOG( SG_FLIGHT, SG_INFO, "After loading aero definition file ..." );
 198
 199     int Neng = Propulsion->GetNumEngines();
 200     SG_LOG( SG_FLIGHT, SG_INFO, "num engines = " << Neng );
 201
 202     if ( GroundReactions->GetNumGearUnits() <= 0 ) {
 203         SG_LOG( SG_FLIGHT, SG_ALERT, "num gear units = "
 204                 << GroundReactions->GetNumGearUnits() );
 205         SG_LOG( SG_FLIGHT, SG_ALERT, "This is a very bad thing because with 0 gear units, the ground trimming");
 206         SG_LOG( SG_FLIGHT, SG_ALERT, "routine (coming up later in the code) will core dump.");
 207         SG_LOG( SG_FLIGHT, SG_ALERT, "Halting the sim now, and hoping a solution will present itself soon!");
 208         exit(-1);
 209     }
 210
 211     init_gear();
 212
 213     // Set initial fuel levels if provided.
 214     for (unsigned int i = 0; i < Propulsion->GetNumTanks(); i++) {
 215       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 216       if (node->getChild("level-gal_us", 0, false) != 0) {
 217         Propulsion->GetTank(i)->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 218       } else {
 219         node->setDoubleValue("level-lbs", Propulsion->GetTank(i)->GetContents());
 220         node->setDoubleValue("level-gal_us", Propulsion->GetTank(i)->GetContents() / 6.6);
 221       }
 222       node->setDoubleValue("capacity-gal_us",
 223                            Propulsion->GetTank(i)->GetCapacity() / 6.6);
 224     }
 225     Propulsion->SetFuelFreeze((fgGetNode("/sim/freeze/fuel",true))->getBoolValue());
 226
 227     fgSetDouble("/fdm/trim/pitch-trim", FCS->GetPitchTrimCmd());
 228     fgSetDouble("/fdm/trim/throttle",   FCS->GetThrottleCmd(0));
 229     fgSetDouble("/fdm/trim/aileron",    FCS->GetDaCmd());
 230     fgSetDouble("/fdm/trim/rudder",     FCS->GetDrCmd());
 231
 232     startup_trim = fgGetNode("/sim/presets/trim", true);
 233
 234     trimmed = fgGetNode("/fdm/trim/trimmed", true);
 235     trimmed->setBoolValue(false);
 236
 237     pitch_trim = fgGetNode("/fdm/trim/pitch-trim", true );
 238     throttle_trim = fgGetNode("/fdm/trim/throttle", true );
 239     aileron_trim = fgGetNode("/fdm/trim/aileron", true );
 240     rudder_trim = fgGetNode("/fdm/trim/rudder", true );
 241
 242     stall_warning = fgGetNode("/sim/alarms/stall-warning",true);
 243     stall_warning->setDoubleValue(0);
 244
 245
 246     flap_pos_pct=fgGetNode("/surface-positions/flap-pos-norm",true);
 247     elevator_pos_pct=fgGetNode("/surface-positions/elevator-pos-norm",true);
 248     left_aileron_pos_pct
 249         =fgGetNode("/surface-positions/left-aileron-pos-norm",true);
 250     right_aileron_pos_pct
 251         =fgGetNode("/surface-positions/right-aileron-pos-norm",true);
 252     rudder_pos_pct=fgGetNode("/surface-positions/rudder-pos-norm",true);
 253     speedbrake_pos_pct
 254         =fgGetNode("/surface-positions/speedbrake-pos-norm",true);
 255     spoilers_pos_pct=fgGetNode("/surface-positions/spoilers-pos-norm",true);
 256     tailhook_pos_pct=fgGetNode("/gear/tailhook/position-norm",true);
 257     wing_fold_pos_pct=fgGetNode("surface-positions/wing-fold-pos-norm",true);
 258
 259     elevator_pos_pct->setDoubleValue(0);
 260     left_aileron_pos_pct->setDoubleValue(0);
 261     right_aileron_pos_pct->setDoubleValue(0);
 262     rudder_pos_pct->setDoubleValue(0);
 263     flap_pos_pct->setDoubleValue(0);
 264     speedbrake_pos_pct->setDoubleValue(0);
 265     spoilers_pos_pct->setDoubleValue(0);
 266
 267     ab_brake_engaged = fgGetNode("/autopilot/autobrake/engaged", true);
 268     ab_brake_left_pct = fgGetNode("/autopilot/autobrake/brake-left-output", true);
 269     ab_brake_right_pct = fgGetNode("/autopilot/autobrake/brake-right-output", true);
 270
 271     temperature = fgGetNode("/environment/temperature-degc",true);
 272     pressure = fgGetNode("/environment/pressure-inhg",true);
 273     density = fgGetNode("/environment/density-slugft3",true);
 274     turbulence_gain = fgGetNode("/environment/turbulence/magnitude-norm",true);
 275     turbulence_rate = fgGetNode("/environment/turbulence/rate-hz",true);
 276
 277     wind_from_north= fgGetNode("/environment/wind-from-north-fps",true);
 278     wind_from_east = fgGetNode("/environment/wind-from-east-fps" ,true);
 279     wind_from_down = fgGetNode("/environment/wind-from-down-fps" ,true);
 280
 281     slaved = fgGetNode("/sim/slaved/enabled", true);
 282
 283     for (unsigned int i = 0; i < Propulsion->GetNumEngines(); i++) {
 284       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 285       Propulsion->GetEngine(i)->GetThruster()->SetRPM(node->getDoubleValue("rpm") /
 286                      Propulsion->GetEngine(i)->GetThruster()->GetGearRatio());
 287     }
 288
 289     hook_root_struct = FGColumnVector3(
 290         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-x-in", 196),
 291         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-y-in", 0),
 292         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-z-in", -16));
 293     last_hook_tip[0] = 0; last_hook_tip[1] = 0; last_hook_tip[2] = 0;
 294     last_hook_root[0] = 0; last_hook_root[1] = 0; last_hook_root[2] = 0;
 295
 296     crashed = false;
 297 }
 298
 299 /******************************************************************************/
 300 FGJSBsim::~FGJSBsim(void)
 301 {
 302   delete fdmex;
 303 }
 304
 305 /******************************************************************************/
 306
 307 // Initialize the JSBsim flight model, dt is the time increment for
 308 // each subsequent iteration through the EOM
 309
 310 void FGJSBsim::init()
 311 {
 312     SG_LOG( SG_FLIGHT, SG_INFO, "Starting and initializing JSBsim" );
 313
 314     // Explicitly call the superclass's
 315     // init method first.
 316
 317     if (fgGetBool("/environment/params/control-fdm-atmosphere")) {
 318       Atmosphere->UseExternal();
 319       Atmosphere->SetExTemperature(
 320                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 321       Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 322       Atmosphere->SetExDensity(density->getDoubleValue());
 323       Atmosphere->SetTurbType(FGAtmosphere::ttCulp);
 324       Atmosphere->SetTurbGain(turbulence_gain->getDoubleValue());
 325       Atmosphere->SetTurbRate(turbulence_rate->getDoubleValue());
 326
 327     } else {
 328       Atmosphere->UseInternal();
 329     }
 330
 331     fgic->SetVNorthFpsIC( -wind_from_north->getDoubleValue() );
 332     fgic->SetVEastFpsIC( -wind_from_east->getDoubleValue() );
 333     fgic->SetVDownFpsIC( -wind_from_down->getDoubleValue() );
 334
 335     //Atmosphere->SetExTemperature(get_Static_temperature());
 336     //Atmosphere->SetExPressure(get_Static_pressure());
 337     //Atmosphere->SetExDensity(get_Density());
 338     SG_LOG(SG_FLIGHT,SG_INFO,"T,p,rho: " << fdmex->GetAtmosphere()->GetTemperature()
 339      << ", " << fdmex->GetAtmosphere()->GetPressure()
 340      << ", " << fdmex->GetAtmosphere()->GetDensity() );
 341
 342 // deprecate egt_degf for egt-degf to have consistent naming
 343 // TODO: raise log-level to ALERT in summer 2010,
 344 // remove alias in fall 2010,
 345 // remove this code in winter 2010
 346     for (unsigned int i=0; i < Propulsion->GetNumEngines(); i++) {
 347       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 348       SGPropertyNode * egtn = node->getNode( "egt_degf" );
 349       if( egtn != NULL ) {
 350         SG_LOG(SG_FLIGHT,SG_WARN,
 351                "Aircraft uses deprecated node egt_degf. Please upgrade to egt-degf");
 352         node->getNode("egt-degf", true)->alias( egtn );
 353       }
 354     }
 355 // end of egt_degf deprecation patch
 356
 357     if (fgGetBool("/sim/presets/running")) {
 358           for (unsigned int i=0; i < Propulsion->GetNumEngines(); i++) {
 359             SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 360             node->setBoolValue("running", true);
 361             Propulsion->GetEngine(i)->SetRunning(true);
 362           }
 363     }
 364
 365     FCS->SetDfPos( ofNorm, globals->get_controls()->get_flaps() );
 366
 367     common_init();
 368
 369     copy_to_JSBsim();
 370     fdmex->RunIC();     //loop JSBSim once w/o integrating
 371     copy_from_JSBsim(); //update the bus
 372
 373     SG_LOG( SG_FLIGHT, SG_INFO, "  Initialized JSBSim with:" );
 374
 375     switch(fgic->GetSpeedSet()) {
 376     case setned:
 377         SG_LOG(SG_FLIGHT,SG_INFO, "  Vn,Ve,Vd= "
 378                << Propagate->GetVel(FGJSBBase::eNorth) << ", "
 379                << Propagate->GetVel(FGJSBBase::eEast) << ", "
 380                << Propagate->GetVel(FGJSBBase::eDown) << " ft/s");
 381     break;
 382     case setuvw:
 383         SG_LOG(SG_FLIGHT,SG_INFO, "  U,V,W= "
 384                << Propagate->GetUVW(1) << ", "
 385                << Propagate->GetUVW(2) << ", "
 386                << Propagate->GetUVW(3) << " ft/s");
 387     break;
 388     case setmach:
 389         SG_LOG(SG_FLIGHT,SG_INFO, "  Mach: "
 390                << Auxiliary->GetMach() );
 391     break;
 392     case setvc:
 393     default:
 394         SG_LOG(SG_FLIGHT,SG_INFO, "  Indicated Airspeed: "
 395                << Auxiliary->GetVcalibratedKTS() << " knots" );
 396     break;
 397     }
 398
 399     stall_warning->setDoubleValue(0);
 400
 401     SG_LOG( SG_FLIGHT, SG_INFO, "  Bank Angle: "
 402             << Propagate->GetEuler(FGJSBBase::ePhi)*RADTODEG << " deg" );
 403     SG_LOG( SG_FLIGHT, SG_INFO, "  Pitch Angle: "
 404             << Propagate->GetEuler(FGJSBBase::eTht)*RADTODEG << " deg" );
 405     SG_LOG( SG_FLIGHT, SG_INFO, "  True Heading: "
 406             << Propagate->GetEuler(FGJSBBase::ePsi)*RADTODEG << " deg" );
 407     SG_LOG( SG_FLIGHT, SG_INFO, "  Latitude: "
 408             << Propagate->GetLocation().GetLatitudeDeg() << " deg" );
 409     SG_LOG( SG_FLIGHT, SG_INFO, "  Longitude: "
 410             << Propagate->GetLocation().GetLongitudeDeg() << " deg" );
 411     SG_LOG( SG_FLIGHT, SG_INFO, "  Altitude: "
 412             << Propagate->GetAltitudeASL() << " feet" );
 413     SG_LOG( SG_FLIGHT, SG_INFO, "  loaded initial conditions" );
 414
 415     SG_LOG( SG_FLIGHT, SG_INFO, "  set dt" );
 416
 417     SG_LOG( SG_FLIGHT, SG_INFO, "Finished initializing JSBSim" );
 418
 419     SG_LOG( SG_FLIGHT, SG_INFO, "FGControls::get_gear_down()= " <<
 420                                   globals->get_controls()->get_gear_down() );
 421 }
 422
 423 /******************************************************************************/
 424
 425 void FGJSBsim::unbind()
 426 {
 427   fdmex->Unbind();
 428   FGInterface::unbind();
 429 }
 430
 431 /******************************************************************************/
 432
 433 // Run an iteration of the EOM (equations of motion)
 434
 435 void FGJSBsim::update( double dt )
 436 {
 437     if(crashed) {
 438       if(!fgGetBool("/sim/crashed"))
 439         fgSetBool("/sim/crashed", true);
 440       return;
 441     }
 442
 443     if (is_suspended())
 444       return;
 445
 446     int multiloop = _calc_multiloop(dt);
 447
 448     int i;
 449
 450     // Compute the radius of the aircraft. That is the radius of a ball
 451     // where all gear units are in. At the moment it is at least 10ft ...
 452     double acrad = 10.0;
 453     int n_gears = GroundReactions->GetNumGearUnits();
 454     for (i=0; i<n_gears; ++i) {
 455       FGColumnVector3 bl = GroundReactions->GetGearUnit(i)->GetBodyLocation();
 456       double r = bl.Magnitude();
 457       if (acrad < r)
 458         acrad = r;
 459     }
 460
 461     // Compute the potential movement of this aircraft and query for the
 462     // ground in this area.
 463     double groundCacheRadius = acrad + 2*dt*Propagate->GetUVW().Magnitude();
 464     double alt, slr, lat, lon;
 465     FGLocation cart = Auxiliary->GetLocationVRP();
 466     if ( needTrim && startup_trim->getBoolValue() ) {
 467       alt = fgic->GetAltitudeASLFtIC();
 468       slr = fgic->GetSeaLevelRadiusFtIC();
 469       lat = fgic->GetLatitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 470       lon = fgic->GetLongitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 471       cart = FGLocation(lon, lat, alt+slr);
 472     }
 473     double cart_pos[3] = { cart(1), cart(2), cart(3) };
 474     double t0 = fdmex->GetSimTime();
 475     bool cache_ok = prepare_ground_cache_ft( t0, t0 + dt, cart_pos,
 476                                              groundCacheRadius );
 477     if (!cache_ok) {
 478       SG_LOG(SG_FLIGHT, SG_WARN,
 479              "FGInterface is being called without scenery below the aircraft!");
 480
 481       alt = fgic->GetAltitudeASLFtIC();
 482       SG_LOG(SG_FLIGHT, SG_WARN, "altitude         = " << alt);
 483
 484       slr = fgic->GetSeaLevelRadiusFtIC();
 485       SG_LOG(SG_FLIGHT, SG_WARN, "sea level radius = " << slr);
 486
 487       lat = fgic->GetLatitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 488       SG_LOG(SG_FLIGHT, SG_WARN, "latitude         = " << lat);
 489
 490       lon = fgic->GetLongitudeDegIC() * SGD_DEGREES_TO_RADIANS;
 491       SG_LOG(SG_FLIGHT, SG_WARN, "longitude        = " << lon);
 492       //return;
 493     }
 494
 495     copy_to_JSBsim();
 496
 497     trimmed->setBoolValue(false);
 498
 499     if ( needTrim ) {
 500       if ( startup_trim->getBoolValue() ) {
 501         double contact[3], d[3], vel[3], agl;
 502         get_agl_ft(fdmex->GetSimTime(), cart_pos, SG_METER_TO_FEET*2, contact,
 503                    d, vel, d, &agl);
 504         double terrain_alt = sqrt(contact[0]*contact[0] + contact[1]*contact[1]
 505              + contact[2]*contact[2]) - fgic->GetSeaLevelRadiusFtIC();
 506
 507         SG_LOG(SG_FLIGHT, SG_INFO,
 508           "Ready to trim, terrain elevation is: "
 509             << terrain_alt * SG_METER_TO_FEET );
 510
 511         if (fgGetBool("/sim/presets/onground")) {
 512           FGColumnVector3 gndVelNED = cart.GetTec2l()
 513                                     * FGColumnVector3(vel[0], vel[1], vel[2]);
 514           fgic->SetVNorthFpsIC(gndVelNED(1));
 515           fgic->SetVEastFpsIC(gndVelNED(2));
 516           fgic->SetVDownFpsIC(gndVelNED(3));
 517         }
 518         fgic->SetTerrainElevationFtIC( terrain_alt );
 519         do_trim();
 520       } else {
 521         fdmex->RunIC();  //apply any changes made through the set_ functions
 522       }
 523       needTrim = false;
 524     }
 525
 526     for ( i=0; i < multiloop; i++ ) {
 527       fdmex->Run();
 528       update_external_forces(fdmex->GetSimTime() + i * fdmex->GetDeltaT());
 529     }
 530
 531     FGJSBBase::Message* msg;
 532     while (msg = fdmex->ProcessNextMessage()) {
 533 //      msg = fdmex->ProcessNextMessage();
 534       switch (msg->type) {
 535       case FGJSBBase::Message::eText:
 536         if (msg->text == "Crash Detected: Simulation FREEZE.")
 537           crashed = true;
 538         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text );
 539         break;
 540       case FGJSBBase::Message::eBool:
 541         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->bVal );
 542         break;
 543       case FGJSBBase::Message::eInteger:
 544         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->iVal );
 545         break;
 546       case FGJSBBase::Message::eDouble:
 547         SG_LOG( SG_FLIGHT, SG_INFO, msg->messageId << ": " << msg->text << " " << msg->dVal );
 548         break;
 549       default:
 550         SG_LOG( SG_FLIGHT, SG_INFO, "Unrecognized message type." );
 551         break;
 552       }
 553     }
 554
 555     // translate JSBsim back to FG structure so that the
 556     // autopilot (and the rest of the sim can use the updated values
 557     copy_from_JSBsim();
 558 }
 559
 560 /******************************************************************************/
 561
 562 // Convert from the FGInterface struct to the JSBsim generic_ struct
 563
 564 bool FGJSBsim::copy_to_JSBsim()
 565 {
 566     double tmp;
 567     unsigned int i;
 568
 569     // copy control positions into the JSBsim structure
 570
 571     FCS->SetDaCmd( globals->get_controls()->get_aileron());
 572     FCS->SetRollTrimCmd( globals->get_controls()->get_aileron_trim() );
 573     FCS->SetDeCmd( globals->get_controls()->get_elevator());
 574     FCS->SetPitchTrimCmd( globals->get_controls()->get_elevator_trim() );
 575     FCS->SetDrCmd( -globals->get_controls()->get_rudder() );
 576     FCS->SetYawTrimCmd( -globals->get_controls()->get_rudder_trim() );
 577     FCS->SetDsCmd( globals->get_controls()->get_rudder() );
 578     FCS->SetDfCmd( globals->get_controls()->get_flaps() );
 579     FCS->SetDsbCmd( globals->get_controls()->get_speedbrake() );
 580     FCS->SetDspCmd( globals->get_controls()->get_spoilers() );
 581
 582         // Parking brake sets minimum braking
 583         // level for mains.
 584     double parking_brake = globals->get_controls()->get_brake_parking();
 585     double left_brake = globals->get_controls()->get_brake_left();
 586     double right_brake = globals->get_controls()->get_brake_right();
 587
 588     if (ab_brake_engaged->getBoolValue()) {
 589       left_brake = ab_brake_left_pct->getDoubleValue();
 590       right_brake = ab_brake_right_pct->getDoubleValue();
 591     }
 592
 593     FCS->SetLBrake(FMAX(left_brake, parking_brake));
 594     FCS->SetRBrake(FMAX(right_brake, parking_brake));
 595
 596
 597     FCS->SetCBrake( 0.0 );
 598     // FCS->SetCBrake( globals->get_controls()->get_brake(2) );
 599
 600     FCS->SetGearCmd( globals->get_controls()->get_gear_down());
 601     for (i = 0; i < Propulsion->GetNumEngines(); i++) {
 602       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 603
 604       FCS->SetThrottleCmd(i, globals->get_controls()->get_throttle(i));
 605       FCS->SetMixtureCmd(i, globals->get_controls()->get_mixture(i));
 606       FCS->SetPropAdvanceCmd(i, globals->get_controls()->get_prop_advance(i));
 607       FCS->SetFeatherCmd(i, globals->get_controls()->get_feather(i));
 608
 609       switch (Propulsion->GetEngine(i)->GetType()) {
 610       case FGEngine::etPiston:
 611         { // FGPiston code block
 612         FGPiston* eng = (FGPiston*)Propulsion->GetEngine(i);
 613         eng->SetMagnetos( globals->get_controls()->get_magnetos(i) );
 614         break;
 615         } // end FGPiston code block
 616       case FGEngine::etTurbine:
 617         { // FGTurbine code block
 618         FGTurbine* eng = (FGTurbine*)Propulsion->GetEngine(i);
 619         eng->SetAugmentation( globals->get_controls()->get_augmentation(i) );
 620         eng->SetReverse( globals->get_controls()->get_reverser(i) );
 621         //eng->SetInjection( globals->get_controls()->get_water_injection(i) );
 622         eng->SetCutoff( globals->get_controls()->get_cutoff(i) );
 623         eng->SetIgnition( globals->get_controls()->get_ignition(i) );
 624         break;
 625         } // end FGTurbine code block
 626       case FGEngine::etRocket:
 627         { // FGRocket code block
 628         FGRocket* eng = (FGRocket*)Propulsion->GetEngine(i);
 629         break;
 630         } // end FGRocket code block
 631       case FGEngine::etTurboprop:
 632         { // FGTurboProp code block
 633         FGTurboProp* eng = (FGTurboProp*)Propulsion->GetEngine(i);
 634         eng->SetReverse( globals->get_controls()->get_reverser(i) );
 635         eng->SetCutoff( globals->get_controls()->get_cutoff(i) );
 636         eng->SetIgnition( globals->get_controls()->get_ignition(i) );
 637
 638         eng->SetGeneratorPower( globals->get_controls()->get_generator_breaker(i) );
 639         eng->SetCondition( globals->get_controls()->get_condition(i) );
 640         break;
 641         } // end FGTurboProp code block
 642       default:
 643         break;
 644       }
 645
 646       { // FGEngine code block
 647       FGEngine* eng = Propulsion->GetEngine(i);
 648
 649       eng->SetStarter( globals->get_controls()->get_starter(i) );
 650       eng->SetRunning( node->getBoolValue("running") );
 651       } // end FGEngine code block
 652     }
 653
 654
 655     Propagate->SetSeaLevelRadius( get_Sea_level_radius() );
 656
 657     Atmosphere->SetExTemperature(
 658                   9.0/5.0*(temperature->getDoubleValue()+273.15) );
 659     Atmosphere->SetExPressure(pressure->getDoubleValue()*70.726566);
 660     Atmosphere->SetExDensity(density->getDoubleValue());
 661
 662     tmp = turbulence_gain->getDoubleValue();
 663     //Atmosphere->SetTurbGain(tmp * tmp * 100.0);
 664
 665     tmp = turbulence_rate->getDoubleValue();
 666     //Atmosphere->SetTurbRate(tmp);
 667
 668     Atmosphere->SetWindNED( -wind_from_north->getDoubleValue(),
 669                             -wind_from_east->getDoubleValue(),
 670                             -wind_from_down->getDoubleValue() );
 671 //    SG_LOG(SG_FLIGHT,SG_INFO, "Wind NED: "
 672 //                  << get_V_north_airmass() << ", "
 673 //                  << get_V_east_airmass()  << ", "
 674 //                  << get_V_down_airmass() );
 675
 676     for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 677       SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 678       FGTank * tank = Propulsion->GetTank(i);
 679       tank->SetContents(node->getDoubleValue("level-gal_us") * 6.6);
 680 //       tank->SetContents(node->getDoubleValue("level-lbs"));
 681     }
 682
 683     Propulsion->SetFuelFreeze((fgGetNode("/sim/freeze/fuel",true))->getBoolValue());
 684     fdmex->SetChild(slaved->getBoolValue());
 685
 686     return true;
 687 }
 688
 689 /******************************************************************************/
 690
 691 // Convert from the JSBsim generic_ struct to the FGInterface struct
 692
 693 bool FGJSBsim::copy_from_JSBsim()
 694 {
 695     unsigned int i, j;
 696 /*
 697     _set_Inertias( MassBalance->GetMass(),
 698                    MassBalance->GetIxx(),
 699                    MassBalance->GetIyy(),
 700                    MassBalance->GetIzz(),
 701                    MassBalance->GetIxz() );
 702 */
 703     _set_CG_Position( MassBalance->GetXYZcg(1),
 704                       MassBalance->GetXYZcg(2),
 705                       MassBalance->GetXYZcg(3) );
 706
 707     _set_Accels_Body( Aircraft->GetBodyAccel(1),
 708                       Aircraft->GetBodyAccel(2),
 709                       Aircraft->GetBodyAccel(3) );
 710
 711     _set_Accels_CG_Body_N ( Aircraft->GetNcg(1),
 712                             Aircraft->GetNcg(2),
 713                             Aircraft->GetNcg(3) );
 714
 715     _set_Accels_Pilot_Body( Auxiliary->GetPilotAccel(1),
 716                             Auxiliary->GetPilotAccel(2),
 717                             Auxiliary->GetPilotAccel(3) );
 718
 719     _set_Nlf( Aircraft->GetNlf() );
 720
 721     // Velocities
 722
 723     _set_Velocities_Local( Propagate->GetVel(FGJSBBase::eNorth),
 724                            Propagate->GetVel(FGJSBBase::eEast),
 725                            Propagate->GetVel(FGJSBBase::eDown) );
 726
 727     _set_Velocities_Wind_Body( Propagate->GetUVW(1),
 728                                Propagate->GetUVW(2),
 729                                Propagate->GetUVW(3) );
 730
 731     // Make the HUD work ...
 732     _set_Velocities_Ground( Propagate->GetVel(FGJSBBase::eNorth),
 733                             Propagate->GetVel(FGJSBBase::eEast),
 734                             -Propagate->GetVel(FGJSBBase::eDown) );
 735
 736     _set_V_rel_wind( Auxiliary->GetVt() );
 737
 738     _set_V_equiv_kts( Auxiliary->GetVequivalentKTS() );
 739
 740     _set_V_calibrated_kts( Auxiliary->GetVcalibratedKTS() );
 741
 742     _set_V_ground_speed( Auxiliary->GetVground() );
 743
 744     _set_Omega_Body( Propagate->GetPQR(FGJSBBase::eP),
 745                      Propagate->GetPQR(FGJSBBase::eQ),
 746                      Propagate->GetPQR(FGJSBBase::eR) );
 747
 748     _set_Euler_Rates( Auxiliary->GetEulerRates(FGJSBBase::ePhi),
 749                       Auxiliary->GetEulerRates(FGJSBBase::eTht),
 750                       Auxiliary->GetEulerRates(FGJSBBase::ePsi) );
 751
 752     _set_Mach_number( Auxiliary->GetMach() );
 753
 754     // Positions of Visual Reference Point
 755     FGLocation l = Auxiliary->GetLocationVRP();
 756     _updateGeocentricPosition( l.GetLatitude(), l.GetLongitude(),
 757                                l.GetRadius() - get_Sea_level_radius() );
 758
 759     _set_Altitude_AGL( Propagate->GetDistanceAGL() );
 760     {
 761       double loc_cart[3] = { l(FGJSBBase::eX), l(FGJSBBase::eY), l(FGJSBBase::eZ) };
 762       double contact[3], d[3], sd, t;
 763       is_valid_m(&t, d, &sd);
 764       get_agl_ft(t, loc_cart, SG_METER_TO_FEET*2, contact, d, d, d, &sd);
 765       double rwrad
 766         = FGColumnVector3( contact[0], contact[1], contact[2] ).Magnitude();
 767       _set_Runway_altitude( rwrad - get_Sea_level_radius() );
 768     }
 769
 770     _set_Euler_Angles( Propagate->GetEuler(FGJSBBase::ePhi),
 771                        Propagate->GetEuler(FGJSBBase::eTht),
 772                        Propagate->GetEuler(FGJSBBase::ePsi) );
 773
 774     _set_Alpha( Auxiliary->Getalpha() );
 775     _set_Beta( Auxiliary->Getbeta() );
 776
 777
 778     _set_Gamma_vert_rad( Auxiliary->GetGamma() );
 779
 780     _set_Earth_position_angle( Inertial->GetEarthPositionAngle() );
 781
 782     _set_Climb_Rate( Propagate->Gethdot() );
 783
 784     const FGMatrix33& Tl2b = Propagate->GetTl2b();
 785     for ( i = 1; i <= 3; i++ ) {
 786         for ( j = 1; j <= 3; j++ ) {
 787             _set_T_Local_to_Body( i, j, Tl2b(i,j) );
 788         }
 789     }
 790
 791     // Copy the engine values from JSBSim.
 792     for ( i=0; i < Propulsion->GetNumEngines(); i++ ) {
 793       SGPropertyNode * node = fgGetNode("engines/engine", i, true);
 794       SGPropertyNode * tnode = node->getChild("thruster", 0, true);
 795       FGThruster * thruster = Propulsion->GetEngine(i)->GetThruster();
 796
 797       switch (Propulsion->GetEngine(i)->GetType()) {
 798       case FGEngine::etPiston:
 799         { // FGPiston code block
 800         FGPiston* eng = (FGPiston*)Propulsion->GetEngine(i);
 801         node->setDoubleValue("egt-degf", eng->getExhaustGasTemp_degF());
 802         node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
 803         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 804         node->setDoubleValue("mp-osi", eng->getManifoldPressure_inHg());
 805         // NOTE: mp-osi is not in ounces per square inch.
 806         // This error is left for reasons of backwards compatibility with
 807         // existing FlightGear sound and instrument configurations.
 808         node->setDoubleValue("mp-inhg", eng->getManifoldPressure_inHg());
 809         node->setDoubleValue("cht-degf", eng->getCylinderHeadTemp_degF());
 810         node->setDoubleValue("rpm", eng->getRPM());
 811         } // end FGPiston code block
 812         break;
 813       case FGEngine::etRocket:
 814         { // FGRocket code block
 815         FGRocket* eng = (FGRocket*)Propulsion->GetEngine(i);
 816         } // end FGRocket code block
 817         break;
 818       case FGEngine::etTurbine:
 819         { // FGTurbine code block
 820         FGTurbine* eng = (FGTurbine*)Propulsion->GetEngine(i);
 821         node->setDoubleValue("n1", eng->GetN1());
 822         node->setDoubleValue("n2", eng->GetN2());
 823         node->setDoubleValue("egt-degf", 32 + eng->GetEGT()*9/5);
 824         node->setBoolValue("augmentation", eng->GetAugmentation());
 825         node->setBoolValue("water-injection", eng->GetInjection());
 826         node->setBoolValue("ignition", eng->GetIgnition());
 827         node->setDoubleValue("nozzle-pos-norm", eng->GetNozzle());
 828         node->setDoubleValue("inlet-pos-norm", eng->GetInlet());
 829         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 830         node->setBoolValue("reversed", eng->GetReversed());
 831         node->setBoolValue("cutoff", eng->GetCutoff());
 832         node->setDoubleValue("epr", eng->GetEPR());
 833         globals->get_controls()->set_reverser(i, eng->GetReversed() );
 834         globals->get_controls()->set_cutoff(i, eng->GetCutoff() );
 835         globals->get_controls()->set_water_injection(i, eng->GetInjection() );
 836         globals->get_controls()->set_augmentation(i, eng->GetAugmentation() );
 837         } // end FGTurbine code block
 838         break;
 839       case FGEngine::etTurboprop:
 840         { // FGTurboProp code block
 841         FGTurboProp* eng = (FGTurboProp*)Propulsion->GetEngine(i);
 842         node->setDoubleValue("n1", eng->GetN1());
 843         //node->setDoubleValue("n2", eng->GetN2());
 844         node->setDoubleValue("itt_degf", 32 + eng->GetITT()*9/5);
 845         node->setBoolValue("ignition", eng->GetIgnition());
 846         node->setDoubleValue("nozzle-pos-norm", eng->GetNozzle());
 847         node->setDoubleValue("inlet-pos-norm", eng->GetInlet());
 848         node->setDoubleValue("oil-pressure-psi", eng->getOilPressure_psi());
 849         node->setBoolValue("reversed", eng->GetReversed());
 850         node->setBoolValue("cutoff", eng->GetCutoff());
 851         node->setBoolValue("starting", eng->GetEngStarting());
 852         node->setBoolValue("generator-power", eng->GetGeneratorPower());
 853         node->setBoolValue("damaged", eng->GetCondition());
 854         node->setBoolValue("ielu-intervent", eng->GetIeluIntervent());
 855         node->setDoubleValue("oil-temperature-degf", eng->getOilTemp_degF());
 856 //        node->setBoolValue("onfire", eng->GetFire());
 857         globals->get_controls()->set_reverser(i, eng->GetReversed() );
 858         globals->get_controls()->set_cutoff(i, eng->GetCutoff() );
 859         } // end FGTurboProp code block
 860         break;
 861       case FGEngine::etElectric:
 862         { // FGElectric code block
 863         FGElectric* eng = (FGElectric*)Propulsion->GetEngine(i);
 864         node->setDoubleValue("rpm", eng->getRPM());
 865         } // end FGElectric code block
 866         break;
 867       case FGEngine::etUnknown:
 868         break;
 869       }
 870
 871       { // FGEngine code block
 872       FGEngine* eng = Propulsion->GetEngine(i);
 873       node->setDoubleValue("fuel-flow-gph", eng->getFuelFlow_gph());
 874       node->setDoubleValue("thrust_lb", thruster->GetThrust());
 875       node->setDoubleValue("fuel-flow_pph", eng->getFuelFlow_pph());
 876       node->setBoolValue("running", eng->GetRunning());
 877       node->setBoolValue("starter", eng->GetStarter());
 878       node->setBoolValue("cranking", eng->GetCranking());
 879       globals->get_controls()->set_starter(i, eng->GetStarter() );
 880       } // end FGEngine code block
 881
 882       switch (thruster->GetType()) {
 883       case FGThruster::ttNozzle:
 884         { // FGNozzle code block
 885         FGNozzle* noz = (FGNozzle*)thruster;
 886         } // end FGNozzle code block
 887         break;
 888       case FGThruster::ttPropeller:
 889         { // FGPropeller code block
 890         FGPropeller* prop = (FGPropeller*)thruster;
 891         tnode->setDoubleValue("rpm", thruster->GetRPM());
 892         tnode->setDoubleValue("pitch", prop->GetPitch());
 893         tnode->setDoubleValue("torque", prop->GetTorque());
 894         tnode->setBoolValue("feathered", prop->GetFeather());
 895         } // end FGPropeller code block
 896         break;
 897       case FGThruster::ttRotor:
 898         { // FGRotor code block
 899         FGRotor* rotor = (FGRotor*)thruster;
 900         } // end FGRotor code block
 901         break;
 902       case FGThruster::ttDirect:
 903         { // Direct code block
 904         } // end Direct code block
 905         break;
 906       }
 907
 908     }
 909
 910     // Copy the fuel levels from JSBSim if fuel
 911     // freeze not enabled.
 912     if ( ! Propulsion->GetFuelFreeze() ) {
 913       for (i = 0; i < Propulsion->GetNumTanks(); i++) {
 914         SGPropertyNode * node = fgGetNode("/consumables/fuel/tank", i, true);
 915         FGTank* tank = Propulsion->GetTank(i);
 916         double contents = tank->GetContents();
 917         double temp = tank->GetTemperature_degC();
 918         node->setDoubleValue("level-gal_us", contents/6.6);
 919         node->setDoubleValue("level-lbs", contents);
 920         if (temp != -9999.0) node->setDoubleValue("temperature_degC", temp);
 921       }
 922     }
 923
 924     update_gear();
 925
 926     stall_warning->setDoubleValue( Aerodynamics->GetStallWarn() );
 927
 928     elevator_pos_pct->setDoubleValue( FCS->GetDePos(ofNorm) );
 929     left_aileron_pos_pct->setDoubleValue( FCS->GetDaLPos(ofNorm) );
 930     right_aileron_pos_pct->setDoubleValue( FCS->GetDaRPos(ofNorm) );
 931     rudder_pos_pct->setDoubleValue( -1*FCS->GetDrPos(ofNorm) );
 932     flap_pos_pct->setDoubleValue( FCS->GetDfPos(ofNorm) );
 933     speedbrake_pos_pct->setDoubleValue( FCS->GetDsbPos(ofNorm) );
 934     spoilers_pos_pct->setDoubleValue( FCS->GetDspPos(ofNorm) );
 935     tailhook_pos_pct->setDoubleValue( FCS->GetTailhookPos() );
 936     wing_fold_pos_pct->setDoubleValue( FCS->GetWingFoldPos() );
 937
 938     // force a sim crashed if crashed (altitude AGL < 0)
 939     if (get_Altitude_AGL() < -100.0) {
 940          fdmex->SuspendIntegration();
 941          crashed = true;
 942     }
 943
 944     return true;
 945 }
 946
 947
 948 bool FGJSBsim::ToggleDataLogging(void)
 949 {
 950   // ToDo: handle this properly
 951   fdmex->DisableOutput();
 952   return false;
 953 }
 954
 955
 956 bool FGJSBsim::ToggleDataLogging(bool state)
 957 {
 958     if (state) {
 959       fdmex->EnableOutput();
 960       return true;
 961     } else {
 962       fdmex->DisableOutput();
 963       return false;
 964     }
 965 }
 966
 967
 968 //Positions
 969 void FGJSBsim::set_Latitude(double lat)
 970 {
 971     static SGConstPropertyNode_ptr altitude = fgGetNode("/position/altitude-ft");
 972     double alt;
 973     double sea_level_radius_meters, lat_geoc;
 974
 975     // In case we're not trimming
 976     FGInterface::set_Latitude(lat);
 977
 978     if ( altitude->getDoubleValue() > -9990 ) {
 979       alt = altitude->getDoubleValue();
 980     } else {
 981       alt = 0.0;
 982     }
 983
 984     update_ic();
 985     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Latitude: " << lat );
 986     SG_LOG(SG_FLIGHT,SG_INFO," cur alt (ft) =  " << alt );
 987
 988     sgGeodToGeoc( lat, alt * SG_FEET_TO_METER,
 989                       &sea_level_radius_meters, &lat_geoc );
 990     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
 991     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET  );
 992     fgic->SetLatitudeRadIC( lat_geoc );
 993     needTrim=true;
 994 }
 995
 996
 997 void FGJSBsim::set_Longitude(double lon)
 998 {
 999     SG_LOG(SG_FLIGHT,SG_INFO,"FGJSBsim::set_Longitude: " << lon );
1000
1001     // In case we're not trimming
1002     FGInterface::set_Longitude(lon);
1003
1004     update_ic();
1005     fgic->SetLongitudeRadIC( lon );
1006     needTrim=true;
1007 }
1008
1009 // Sets the altitude above sea level.
1010 void FGJSBsim::set_Altitude(double alt)
1011 {
1012     static SGConstPropertyNode_ptr latitude = fgGetNode("/position/latitude-deg");
1013
1014     double sea_level_radius_meters,lat_geoc;
1015
1016     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Altitude: " << alt );
1017     SG_LOG(SG_FLIGHT,SG_INFO, "  lat (deg) = " << latitude->getDoubleValue() );
1018
1019     // In case we're not trimming
1020     FGInterface::set_Altitude(alt);
1021
1022     update_ic();
1023     sgGeodToGeoc( latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS, alt,
1024                   &sea_level_radius_meters, &lat_geoc);
1025     _set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET  );
1026     fgic->SetSeaLevelRadiusFtIC( sea_level_radius_meters * SG_METER_TO_FEET );
1027     SG_LOG(SG_FLIGHT, SG_INFO,
1028           "Terrain elevation: " << FGInterface::get_Runway_altitude() * SG_METER_TO_FEET );
1029     fgic->SetLatitudeRadIC( lat_geoc );
1030     fgic->SetAltitudeASLFtIC(alt);
1031     needTrim=true;
1032 }
1033
1034 void FGJSBsim::set_V_calibrated_kts(double vc)
1035 {
1036     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_V_calibrated_kts: " <<  vc );
1037
1038     // In case we're not trimming
1039     FGInterface::set_V_calibrated_kts(vc);
1040
1041     update_ic();
1042     fgic->SetVcalibratedKtsIC(vc);
1043     needTrim=true;
1044 }
1045
1046 void FGJSBsim::set_Mach_number(double mach)
1047 {
1048     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Mach_number: " <<  mach );
1049
1050     // In case we're not trimming
1051     FGInterface::set_Mach_number(mach);
1052
1053     update_ic();
1054     fgic->SetMachIC(mach);
1055     needTrim=true;
1056 }
1057
1058 void FGJSBsim::set_Velocities_Local( double north, double east, double down )
1059 {
1060     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Local: "
1061        << north << ", " <<  east << ", " << down );
1062
1063     // In case we're not trimming
1064     FGInterface::set_Velocities_Local(north, east, down);
1065
1066     update_ic();
1067     fgic->SetVNorthFpsIC(north);
1068     fgic->SetVEastFpsIC(east);
1069     fgic->SetVDownFpsIC(down);
1070     needTrim=true;
1071 }
1072
1073 void FGJSBsim::set_Velocities_Wind_Body( double u, double v, double w)
1074 {
1075     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Velocities_Wind_Body: "
1076        << u << ", " <<  v << ", " <<  w );
1077
1078     // In case we're not trimming
1079     FGInterface::set_Velocities_Wind_Body(u, v, w);
1080
1081     update_ic();
1082     fgic->SetUBodyFpsIC(u);
1083     fgic->SetVBodyFpsIC(v);
1084     fgic->SetWBodyFpsIC(w);
1085     needTrim=true;
1086 }
1087
1088 //Euler angles
1089 void FGJSBsim::set_Euler_Angles( double phi, double theta, double psi )
1090 {
1091     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Euler_Angles: "
1092        << phi << ", " << theta << ", " << psi );
1093
1094     // In case we're not trimming
1095     FGInterface::set_Euler_Angles(phi, theta, psi);
1096
1097     update_ic();
1098     fgic->SetThetaRadIC(theta);
1099     fgic->SetPhiRadIC(phi);
1100     fgic->SetPsiRadIC(psi);
1101     needTrim=true;
1102 }
1103
1104 //Flight Path
1105 void FGJSBsim::set_Climb_Rate( double roc)
1106 {
1107     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Climb_Rate: " << roc );
1108
1109     // In case we're not trimming
1110     FGInterface::set_Climb_Rate(roc);
1111
1112     update_ic();
1113     //since both climb rate and flight path angle are set in the FG
1114     //startup sequence, something is needed to keep one from cancelling
1115     //out the other.
1116     if( !(fabs(roc) > 1 && fabs(fgic->GetFlightPathAngleRadIC()) < 0.01) ) {
1117       fgic->SetClimbRateFpsIC(roc);
1118     }
1119     needTrim=true;
1120 }
1121
1122 void FGJSBsim::set_Gamma_vert_rad( double gamma)
1123 {
1124     SG_LOG(SG_FLIGHT,SG_INFO, "FGJSBsim::set_Gamma_vert_rad: " << gamma );
1125
1126     update_ic();
1127     if( !(fabs(gamma) < 0.01 && fabs(fgic->GetClimbRateFpsIC()) > 1) ) {
1128       fgic->SetFlightPathAngleRadIC(gamma);
1129     }
1130     needTrim=true;
1131 }
1132
1133 void FGJSBsim::init_gear(void )
1134 {
1135     FGGroundReactions* gr=fdmex->GetGroundReactions();
1136     int Ngear=GroundReactions->GetNumGearUnits();
1137     for (int i=0;i<Ngear;i++) {
1138       FGLGear *gear = gr->GetGearUnit(i);
1139       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
1140       node->setDoubleValue("xoffset-in", gear->GetBodyLocation()(1));
1141       node->setDoubleValue("yoffset-in", gear->GetBodyLocation()(2));
1142       node->setDoubleValue("zoffset-in", gear->GetBodyLocation()(3));
1143       node->setBoolValue("wow", gear->GetWOW());
1144       node->setDoubleValue("rollspeed-ms", gear->GetWheelRollVel()*0.3043);
1145       node->setBoolValue("has-brake", gear->GetBrakeGroup() > 0);
1146       node->setDoubleValue("position-norm", gear->GetGearUnitPos());
1147       node->setDoubleValue("tire-pressure-norm", gear->GetTirePressure());
1148       node->setDoubleValue("compression-norm", gear->GetCompLen());
1149       node->setDoubleValue("compression-ft", gear->GetCompLen());
1150       if ( gear->GetSteerable() )
1151         node->setDoubleValue("steering-norm", gear->GetSteerNorm());
1152     }
1153 }
1154
1155 void FGJSBsim::update_gear(void)
1156 {
1157     FGGroundReactions* gr=fdmex->GetGroundReactions();
1158     int Ngear=GroundReactions->GetNumGearUnits();
1159     for (int i=0;i<Ngear;i++) {
1160       FGLGear *gear = gr->GetGearUnit(i);
1161       SGPropertyNode * node = fgGetNode("gear/gear", i, true);
1162       node->getChild("wow", 0, true)->setBoolValue( gear->GetWOW());
1163       node->getChild("rollspeed-ms", 0, true)->setDoubleValue(gear->GetWheelRollVel()*0.3043);
1164       node->getChild("position-norm", 0, true)->setDoubleValue(gear->GetGearUnitPos());
1165       gear->SetTirePressure(node->getDoubleValue("tire-pressure-norm"));
1166       node->setDoubleValue("compression-norm", gear->GetCompLen());
1167       node->setDoubleValue("compression-ft", gear->GetCompLen());
1168       if ( gear->GetSteerable() )
1169         node->setDoubleValue("steering-norm", gear->GetSteerNorm());
1170     }
1171 }
1172
1173 void FGJSBsim::do_trim(void)
1174 {
1175   FGTrim *fgtrim;
1176
1177   if ( fgGetBool("/sim/presets/onground") )
1178   {
1179     fgtrim = new FGTrim(fdmex,tGround);
1180   } else {
1181     fgtrim = new FGTrim(fdmex,tLongitudinal);
1182   }
1183
1184   if ( !fgtrim->DoTrim() ) {
1185     fgtrim->Report();
1186     fgtrim->TrimStats();
1187   } else {
1188     trimmed->setBoolValue(true);
1189   }
1190   delete fgtrim;
1191
1192   pitch_trim->setDoubleValue( FCS->GetPitchTrimCmd() );
1193   throttle_trim->setDoubleValue( FCS->GetThrottleCmd(0) );
1194   aileron_trim->setDoubleValue( FCS->GetDaCmd() );
1195   rudder_trim->setDoubleValue( FCS->GetDrCmd() );
1196
1197   globals->get_controls()->set_elevator_trim(FCS->GetPitchTrimCmd());
1198   globals->get_controls()->set_elevator(FCS->GetDeCmd());
1199   globals->get_controls()->set_throttle(FGControls::ALL_ENGINES,
1200   FCS->GetThrottleCmd(0));
1201
1202   globals->get_controls()->set_aileron(FCS->GetDaCmd());
1203   globals->get_controls()->set_rudder( FCS->GetDrCmd());
1204
1205   SG_LOG( SG_FLIGHT, SG_INFO, "  Trim complete" );
1206 }
1207
1208 void FGJSBsim::update_ic(void)
1209 {
1210    if ( !needTrim ) {
1211      fgic->SetLatitudeRadIC(get_Lat_geocentric() );
1212      fgic->SetLongitudeRadIC( get_Longitude() );
1213      fgic->SetAltitudeASLFtIC( get_Altitude() );
1214      fgic->SetVcalibratedKtsIC( get_V_calibrated_kts() );
1215      fgic->SetThetaRadIC( get_Theta() );
1216      fgic->SetPhiRadIC( get_Phi() );
1217      fgic->SetPsiRadIC( get_Psi() );
1218      fgic->SetClimbRateFpsIC( get_Climb_Rate() );
1219    }
1220 }
1221
1222 bool
1223 FGJSBsim::get_agl_ft(double t, const double pt[3], double alt_off,
1224                      double contact[3], double normal[3], double vel[3],
1225                      double angularVel[3], double *agl)
1226 {
1227    const SGMaterial* material;
1228    simgear::BVHNode::Id id;
1229    if (!FGInterface::get_agl_ft(t, pt, alt_off, contact, normal, vel,
1230                                 angularVel, material, id))
1231        return false;
1232    SGGeod geodPt = SGGeod::fromCart(SG_FEET_TO_METER*SGVec3d(pt));
1233    SGQuatd hlToEc = SGQuatd::fromLonLat(geodPt);
1234    *agl = dot(hlToEc.rotate(SGVec3d(0, 0, 1)), SGVec3d(contact) - SGVec3d(pt));
1235    return true;
1236 }
1237
1238 inline static double dot3(const FGColumnVector3& a, const FGColumnVector3& b)
1239 {
1240     return a(1) * b(1) + a(2) * b(2) + a(3) * b(3);
1241 }
1242
1243 inline static double sqr(double x)
1244 {
1245     return x * x;
1246 }
1247
1248 static double angle_diff(double a, double b)
1249 {
1250     double diff = fabs(a - b);
1251     if (diff > 180) diff = 360 - diff;
1252
1253     return diff;
1254 }
1255
1256 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)
1257 {
1258     FGColumnVector3 tip(-hook_length * cos_fi_guess, 0, hook_length * sin_fi_guess);
1259     double dist = dot3(tip, ground_normal_body);
1260     if (fabs(dist + E) < 0.0001) {
1261         sin_fis[*points] = sin_fi_guess;
1262         cos_fis[*points] = cos_fi_guess;
1263         fis[*points] = atan2(sin_fi_guess, cos_fi_guess) * SG_RADIANS_TO_DEGREES;
1264         (*points)++;
1265     }
1266 }
1267
1268
1269 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)
1270 {
1271     if (sin_fi_guess >= -1 && sin_fi_guess <= 1) {
1272         double cos_fi_guess = sqrt(1 - sqr(sin_fi_guess));
1273         check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, cos_fi_guess, sin_fis, cos_fis, fis, points);
1274         if (fabs(cos_fi_guess) > SG_EPSILON) {
1275             check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, -cos_fi_guess, sin_fis, cos_fis, fis, points);
1276         }
1277     }
1278 }
1279
1280 void FGJSBsim::update_external_forces(double t_off)
1281 {
1282     const FGMatrix33& Tb2l = Propagate->GetTb2l();
1283     const FGMatrix33& Tl2b = Propagate->GetTl2b();
1284     const FGLocation& Location = Propagate->GetLocation();
1285     const FGMatrix33& Tec2l = Location.GetTec2l();
1286
1287     double hook_area[4][3];
1288
1289     FGColumnVector3 hook_root_body = MassBalance->StructuralToBody(hook_root_struct);
1290     FGColumnVector3 hook_root = Location.LocalToLocation(Tb2l *   hook_root_body);
1291     hook_area[1][0] = hook_root(1);
1292     hook_area[1][1] = hook_root(2);
1293     hook_area[1][2] = hook_root(3);
1294
1295     hook_length = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-length-ft", 6.75);
1296     double fi_min = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-min-deg", -18);
1297     double fi_max = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-max-deg", 30);
1298     double fi = fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-norm") * (fi_max - fi_min) + fi_min;
1299     double cos_fi = cos(fi * SG_DEGREES_TO_RADIANS);
1300     double sin_fi = sin(fi * SG_DEGREES_TO_RADIANS);
1301
1302     FGColumnVector3 hook_tip_body = hook_root_body;
1303     hook_tip_body(1) -= hook_length * cos_fi;
1304     hook_tip_body(3) += hook_length * sin_fi;
1305
1306     double contact[3];
1307     double ground_normal[3];
1308     double ground_vel[3];
1309     double ground_angular_vel[3];
1310     double root_agl_ft;
1311
1312     if (!got_wire) {
1313         bool got = get_agl_ft(t_off, hook_area[1], 0, contact, ground_normal,
1314                               ground_vel, ground_angular_vel, &root_agl_ft);
1315         if (got && root_agl_ft > 0 && root_agl_ft < hook_length) {
1316             FGColumnVector3 ground_normal_body = Tl2b * (Tec2l * FGColumnVector3(ground_normal[0], ground_normal[1], ground_normal[2]));
1317             FGColumnVector3 contact_body = Tl2b * Location.LocationToLocal(FGColumnVector3(contact[0], contact[1], contact[2]));
1318             double D = -dot3(contact_body, ground_normal_body);
1319
1320             // check hook tip agl against same ground plane
1321             double hook_tip_agl_ft = dot3(hook_tip_body, ground_normal_body) + D;
1322             if (hook_tip_agl_ft < 0) {
1323
1324                 // hook tip: hx - l cos, hy, hz + l sin
1325                 // on ground:  - n0 l cos + n2 l sin + E = 0
1326
1327                 double E = D + dot3(hook_root_body, ground_normal_body);
1328
1329                 // substitue x = sin fi, cos fi = sqrt(1 - x * x)
1330                 // and rearrange to get a quadratic with coeffs:
1331                 double a = sqr(hook_length) * (sqr(ground_normal_body(1)) + sqr(ground_normal_body(3)));
1332                 double b = 2 * E * ground_normal_body(3) * hook_length;
1333                 double c = sqr(E) - sqr(ground_normal_body(1) * hook_length);
1334
1335                 double disc = sqr(b) - 4 * a * c;
1336                 if (disc >= 0) {
1337                     double delta = sqrt(disc) / (2 * a);
1338
1339                     // allow 4 solutions for safety, should never happen
1340                     double sin_fis[4];
1341                     double cos_fis[4];
1342                     double fis[4];
1343                     int points = 0;
1344
1345                     double sin_fi_guess = -b / (2 * a) - delta;
1346                     check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess, sin_fis, cos_fis, fis, &points);
1347                     check_hook_solution(ground_normal_body, E, hook_length, sin_fi_guess + 2 * delta, sin_fis, cos_fis, fis, &points);
1348
1349                     if (points == 2) {
1350                         double diff1 = angle_diff(fi, fis[0]);
1351                         double diff2 = angle_diff(fi, fis[1]);
1352                         int point = diff1 < diff2 ? 0 : 1;
1353                         fi = fis[point];
1354                         sin_fi = sin_fis[point];
1355                         cos_fi = cos_fis[point];
1356                         hook_tip_body(1) = hook_root_body(1) - hook_length * cos_fi;
1357                         hook_tip_body(3) = hook_root_body(3) + hook_length * sin_fi;
1358                     }
1359                 }
1360             }
1361         }
1362     } else {
1363         FGColumnVector3 hook_root_vel = Propagate->GetVel() + (Tb2l * (Propagate->GetPQR() *  hook_root_body));
1364         double wire_ends_ec[2][3];
1365         double wire_vel_ec[2][3];
1366         get_wire_ends_ft(t_off, wire_ends_ec, wire_vel_ec);
1367         FGColumnVector3 wire_vel_1 = Tec2l * FGColumnVector3(wire_vel_ec[0][0], wire_vel_ec[0][1], wire_vel_ec[0][2]);
1368         FGColumnVector3 wire_vel_2 = Tec2l * FGColumnVector3(wire_vel_ec[1][0], wire_vel_ec[1][1], wire_vel_ec[1][2]);
1369         FGColumnVector3 rel_vel = hook_root_vel - (wire_vel_1 + wire_vel_2) / 2;
1370         if (rel_vel.Magnitude() < 3) {
1371             got_wire = false;
1372             release_wire();
1373             fgSetDouble("/fdm/jsbsim/external_reactions/hook/magnitude", 0.0);
1374         } else {
1375             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;
1376             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;
1377             FGColumnVector3 force_plane_normal = wire_end1_body * wire_end2_body;
1378             force_plane_normal.Normalize();
1379             cos_fi = dot3(force_plane_normal, FGColumnVector3(0, 0, 1));
1380             if (cos_fi < 0) cos_fi = -cos_fi;
1381             sin_fi = sqrt(1 - sqr(cos_fi));
1382             fi = atan2(sin_fi, cos_fi) * SG_RADIANS_TO_DEGREES;
1383
1384             fgSetDouble("/fdm/jsbsim/external_reactions/hook/x", -cos_fi);
1385             fgSetDouble("/fdm/jsbsim/external_reactions/hook/y", 0);
1386             fgSetDouble("/fdm/jsbsim/external_reactions/hook/z", sin_fi);
1387             fgSetDouble("/fdm/jsbsim/external_reactions/hook/magnitude", fgGetDouble("/fdm/jsbsim/systems/hook/force"));
1388         }
1389     }
1390
1391     FGColumnVector3 hook_tip = Location.LocalToLocation(Tb2l * hook_tip_body);
1392
1393     hook_area[0][0] = hook_tip(1);
1394     hook_area[0][1] = hook_tip(2);
1395     hook_area[0][2] = hook_tip(3);
1396
1397     if (!got_wire) {
1398         // The previous positions.
1399         hook_area[2][0] = last_hook_root[0];
1400         hook_area[2][1] = last_hook_root[1];
1401         hook_area[2][2] = last_hook_root[2];
1402         hook_area[3][0] = last_hook_tip[0];
1403         hook_area[3][1] = last_hook_tip[1];
1404         hook_area[3][2] = last_hook_tip[2];
1405
1406         // Check if we caught a wire.
1407         // Returns true if we caught one.
1408         if (caught_wire_ft(t_off, hook_area)) {
1409                 got_wire = true;
1410         }
1411     }
1412
1413     // save actual position as old position ...
1414     last_hook_tip[0] = hook_area[0][0];
1415     last_hook_tip[1] = hook_area[0][1];
1416     last_hook_tip[2] = hook_area[0][2];
1417     last_hook_root[0] = hook_area[1][0];
1418     last_hook_root[1] = hook_area[1][1];
1419     last_hook_root[2] = hook_area[1][2];
1420
1421     fgSetDouble("/fdm/jsbsim/systems/hook/tailhook-pos-deg", fi);
1422 }
1423