// flight.c -- a general interface to the various flight models
//
// Written by Curtis Olson, started May 1997.
//
// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
// (Log is kept at end of this file)
#include <stdio.h>
#include "flight.hxx"
#include "LaRCsim.hxx"
#include <Debug/logstream.hxx>
#include <Flight/LaRCsim/ls_interface.h>
#include <Include/fg_constants.h>
#include <Math/fg_geodesy.hxx>
fgFLIGHT cur_flight_params;
/* Initialize the flight model parameters */
int fgFlightModelInit(int model, fgFLIGHT *f, double dt) {
double save_alt = 0.0;
int result;
FG_LOG( FG_FLIGHT ,FG_INFO, "Initializing flight model" );
if ( model == FG_SLEW ) {
// fgSlewInit(dt);
} else if ( model == FG_LARCSIM ) {
/* lets try to avoid really screwing up the LaRCsim model */
if ( FG_Altitude < -9000 ) {
save_alt = FG_Altitude;
FG_Altitude = 0;
}
fgFlight_2_LaRCsim(f); /* translate FG to LaRCsim structure */
fgLaRCsimInit(dt);
FG_LOG( FG_FLIGHT, FG_INFO, "FG pos = " << FG_Latitude );
fgLaRCsim_2_Flight(f); /* translate LaRCsim back to FG structure */
/* but lets restore our original bogus altitude when we are done */
if ( save_alt < -9000 ) {
FG_Altitude = save_alt;
}
} else {
FG_LOG( FG_FLIGHT, FG_WARN,
"Unimplemented flight model == " << model );
}
result = 1;
return(result);
}
/* Run multiloop iterations of the flight model */
int fgFlightModelUpdate(int model, fgFLIGHT *f, int multiloop) {
double time_step, start_elev, end_elev;
int result;
// printf("Altitude = %.2f\n", FG_Altitude * 0.3048);
time_step = (1.0 / DEFAULT_MODEL_HZ) * multiloop;
start_elev = FG_Altitude;
if ( model == FG_SLEW ) {
// fgSlewUpdate(f, multiloop);
} else if ( model == FG_LARCSIM ) {
fgLaRCsimUpdate(f, multiloop);
} else {
FG_LOG( FG_FLIGHT, FG_WARN,
"Unimplemented flight model == " << model );
}
end_elev = FG_Altitude;
FG_Climb_Rate = (end_elev - start_elev) / time_step; /* feet per second */
result = 1;
return(result);
}
/* Set the altitude (force) */
void fgFlightModelSetAltitude(int model, fgFLIGHT *f, double alt_meters) {
double sea_level_radius_meters;
double lat_geoc;
// Set the FG variables first
fgGeodToGeoc( FG_Latitude, alt_meters,
&sea_level_radius_meters, &lat_geoc);
FG_Altitude = alt_meters * METER_TO_FEET;
FG_Radius_to_vehicle = FG_Altitude +
(sea_level_radius_meters * METER_TO_FEET);
/* additional work needed for some flight models */
if ( model == FG_LARCSIM ) {
ls_ForceAltitude(FG_Altitude);
}
}
// $Log$
// Revision 1.3 1998/11/06 21:18:03 curt
// Converted to new logstream debugging facility. This allows release
// builds with no messages at all (and no performance impact) by using
// the -DFG_NDEBUG flag.
//
// Revision 1.2 1998/10/16 23:27:40 curt
// C++-ifying.
//
// Revision 1.1 1998/10/16 20:16:41 curt
// Renamed flight.[ch] to flight.[ch]xx
//
// Revision 1.19 1998/09/29 14:57:38 curt
// c++-ified comments.
//
// Revision 1.18 1998/09/29 02:02:40 curt
// Added a rate of climb calculation.
//
// Revision 1.17 1998/08/24 20:09:07 curt
// .
//
// Revision 1.16 1998/08/22 14:49:55 curt
// Attempting to iron out seg faults and crashes.
// Did some shuffling to fix a initialization order problem between view
// position, scenery elevation.
//
// Revision 1.15 1998/07/30 23:44:36 curt
// Beginning to add support for multiple flight models.
//
// Revision 1.14 1998/07/12 03:08:27 curt
// Added fgFlightModelSetAltitude() to force the altitude to something
// other than the current altitude. LaRCsim doesn't let you do this by just
// changing FG_Altitude.
//
// Revision 1.13 1998/04/25 22:06:28 curt
// Edited cvs log messages in source files ... bad bad bad!
//
// Revision 1.12 1998/04/21 16:59:33 curt
// Integrated autopilot.
// Prepairing for C++ integration.
//
// Revision 1.11 1998/04/18 04:14:04 curt
// Moved fg_debug.c to it's own library.
//
// Revision 1.10 1998/02/07 15:29:37 curt
// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.9 1998/01/27 00:47:53 curt
// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
// system and commandline/config file processing code.
//
// Revision 1.8 1998/01/19 19:27:03 curt
// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
// This should simplify things tremendously.
//
// Revision 1.7 1998/01/19 18:40:23 curt
// Tons of little changes to clean up the code and to remove fatal errors
// when building with the c++ compiler.
//
// Revision 1.6 1998/01/19 18:35:43 curt
// Minor tweaks and fixes for cygwin32.
//
// Revision 1.5 1997/12/30 20:47:37 curt
// Integrated new event manager with subsystem initializations.
//
// Revision 1.4 1997/12/10 22:37:42 curt
// Prepended "fg" on the name of all global structures that didn't have it yet.
// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
//
// Revision 1.3 1997/08/27 03:30:04 curt
// Changed naming scheme of basic shared structures.
//
// Revision 1.2 1997/05/29 22:39:57 curt
// Working on incorporating the LaRCsim flight model.
//
// Revision 1.1 1997/05/29 02:35:04 curt
// Initial revision.
//