1 // flight.c -- a general interface to the various flight models
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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.
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.
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.
22 // (Log is kept at end of this file)
27 #include <Debug/fg_debug.h>
28 #include <Flight/flight.h>
29 #include <Flight/LaRCsim/ls_interface.h>
30 #include <Include/fg_constants.h>
31 #include <Math/fg_geodesy.h>
34 fgFLIGHT cur_flight_params;
37 /* Initialize the flight model parameters */
38 int fgFlightModelInit(int model, fgFLIGHT *f, double dt) {
39 double save_alt = 0.0;
42 fgPrintf(FG_FLIGHT,FG_INFO,"Initializing flight model\n");
44 if ( model == FG_SLEW ) {
46 } else if ( model == FG_LARCSIM ) {
47 /* lets try to avoid really screwing up the LaRCsim model */
48 if ( FG_Altitude < -9000 ) {
49 save_alt = FG_Altitude;
53 fgFlight_2_LaRCsim(f); /* translate FG to LaRCsim structure */
55 fgPrintf( FG_FLIGHT, FG_INFO, "FG pos = %.2f\n", FG_Latitude );
56 fgLaRCsim_2_Flight(f); /* translate LaRCsim back to FG structure */
58 /* but lets restore our original bogus altitude when we are done */
59 if ( save_alt < -9000 ) {
60 FG_Altitude = save_alt;
63 fgPrintf( FG_FLIGHT, FG_WARN,
64 "Unimplemented flight model == %d\n", model );
73 /* Run multiloop iterations of the flight model */
74 int fgFlightModelUpdate(int model, fgFLIGHT *f, int multiloop) {
75 double time_step, start_elev, end_elev;
77 // printf("Altitude = %.2f\n", FG_Altitude * 0.3048);
79 time_step = (1.0 / DEFAULT_MODEL_HZ) * multiloop;
80 start_elev = FG_Altitude;
82 if ( model == FG_SLEW ) {
83 // fgSlewUpdate(f, multiloop);
84 } else if ( model == FG_LARCSIM ) {
85 fgLaRCsimUpdate(f, multiloop);
87 fgPrintf( FG_FLIGHT, FG_WARN,
88 "Unimplemented flight model == %d\n", model );
91 end_elev = FG_Altitude;
93 FG_Climb_Rate = (end_elev - start_elev) / time_step; /* feet per second */
101 /* Set the altitude (force) */
102 int fgFlightModelSetAltitude(int model, fgFLIGHT *f, double alt_meters) {
103 double sea_level_radius_meters;
105 // Set the FG variables first
106 fgGeodToGeoc( FG_Latitude, alt_meters,
107 &sea_level_radius_meters, &lat_geoc);
109 FG_Altitude = alt_meters * METER_TO_FEET;
110 FG_Radius_to_vehicle = FG_Altitude +
111 (sea_level_radius_meters * METER_TO_FEET);
113 /* additional work needed for some flight models */
114 if ( model == FG_LARCSIM ) {
115 ls_ForceAltitude(FG_Altitude);
122 // Revision 1.1 1998/10/16 20:16:41 curt
123 // Renamed flight.[ch] to flight.[ch]xx
125 // Revision 1.19 1998/09/29 14:57:38 curt
126 // c++-ified comments.
128 // Revision 1.18 1998/09/29 02:02:40 curt
129 // Added a rate of climb calculation.
131 // Revision 1.17 1998/08/24 20:09:07 curt
134 // Revision 1.16 1998/08/22 14:49:55 curt
135 // Attempting to iron out seg faults and crashes.
136 // Did some shuffling to fix a initialization order problem between view
137 // position, scenery elevation.
139 // Revision 1.15 1998/07/30 23:44:36 curt
140 // Beginning to add support for multiple flight models.
142 // Revision 1.14 1998/07/12 03:08:27 curt
143 // Added fgFlightModelSetAltitude() to force the altitude to something
144 // other than the current altitude. LaRCsim doesn't let you do this by just
145 // changing FG_Altitude.
147 // Revision 1.13 1998/04/25 22:06:28 curt
148 // Edited cvs log messages in source files ... bad bad bad!
150 // Revision 1.12 1998/04/21 16:59:33 curt
151 // Integrated autopilot.
152 // Prepairing for C++ integration.
154 // Revision 1.11 1998/04/18 04:14:04 curt
155 // Moved fg_debug.c to it's own library.
157 // Revision 1.10 1998/02/07 15:29:37 curt
158 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
159 // <chotchkiss@namg.us.anritsu.com>
161 // Revision 1.9 1998/01/27 00:47:53 curt
162 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
163 // system and commandline/config file processing code.
165 // Revision 1.8 1998/01/19 19:27:03 curt
166 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
167 // This should simplify things tremendously.
169 // Revision 1.7 1998/01/19 18:40:23 curt
170 // Tons of little changes to clean up the code and to remove fatal errors
171 // when building with the c++ compiler.
173 // Revision 1.6 1998/01/19 18:35:43 curt
174 // Minor tweaks and fixes for cygwin32.
176 // Revision 1.5 1997/12/30 20:47:37 curt
177 // Integrated new event manager with subsystem initializations.
179 // Revision 1.4 1997/12/10 22:37:42 curt
180 // Prepended "fg" on the name of all global structures that didn't have it yet.
181 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
183 // Revision 1.3 1997/08/27 03:30:04 curt
184 // Changed naming scheme of basic shared structures.
186 // Revision 1.2 1997/05/29 22:39:57 curt
187 // Working on incorporating the LaRCsim flight model.
189 // Revision 1.1 1997/05/29 02:35:04 curt