144 lines
4 KiB
C
144 lines
4 KiB
C
/**************************************************************************
|
|
* constants.h -- various constant definitions
|
|
*
|
|
* Written by Curtis Olson, started July 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)
|
|
**************************************************************************/
|
|
|
|
|
|
#ifndef CONSTANTS_H
|
|
#define CONSTANTS_H
|
|
|
|
|
|
#include <math.h>
|
|
|
|
|
|
/* This should be defined in the toplevel make.inc */
|
|
#ifndef VERSION
|
|
#define VERSION "\"not defined\""
|
|
#endif
|
|
|
|
|
|
/* Make sure PI is defined in its various forms */
|
|
#ifdef M_PI
|
|
# define FG_PI M_PI
|
|
#else
|
|
# define FG_PI 3.14159265358979323846 /* pi */
|
|
#endif
|
|
|
|
#ifdef M_PI_2
|
|
# define FG_PI_2 M_PI_2
|
|
#else
|
|
# define FG_PI_2 1.57079632679489661923 /* pi/2 */
|
|
#endif
|
|
|
|
#define FG_2PI (FG_PI + FG_PI) /* 2*pi */
|
|
|
|
|
|
/* Radius of Earth in kilometers at the equator. Another source had
|
|
* 6378.165 but this is probably close enough */
|
|
#define EARTH_RAD 6378.155
|
|
|
|
|
|
/* Earth parameters for WGS 84, taken from LaRCsim/ls_constants.h */
|
|
|
|
/* Value of earth radius from [8] */
|
|
#define EQUATORIAL_RADIUS_FT 20925650. /* ft */
|
|
#define EQUATORIAL_RADIUS_KM 6378138.12 /* meter */
|
|
/* Radius squared */
|
|
#define RESQ_FT 437882827922500. /* ft */
|
|
#define RESQ_KM 40680645877797.1344 /* meter */
|
|
|
|
/* Value of earth flattening parameter from ref [8]
|
|
*
|
|
* Note: FP = f
|
|
* E = 1-f
|
|
* EPS = sqrt(1-(1-f)^2)
|
|
*/
|
|
|
|
#define FP 0.003352813178
|
|
#define E 0.996647186
|
|
#define EPS 0.081819221
|
|
#define INVG 0.031080997
|
|
|
|
|
|
/* Conversions */
|
|
|
|
/* Degrees to Radians */
|
|
#define DEG_TO_RAD 0.017453292 /* deg*pi/180 = rad */
|
|
|
|
/* Radians to Degrees */
|
|
#define RAD_TO_DEG 57.29577951 /* rad*180/pi = deg */
|
|
|
|
/* Arc seconds to radians */ /* (arcsec*pi)/(3600*180) = rad */
|
|
#define ARCSEC_TO_RAD 4.84813681109535993589e-06
|
|
|
|
/* Radians to arc seconds */ /* (rad*3600*180)/pi = arcsec */
|
|
#define RAD_TO_ARCSEC 206264.806247096355156
|
|
|
|
/* Feet to Meters */
|
|
#define FEET_TO_METER 0.3048
|
|
|
|
/* Meters to Feet */
|
|
#define METER_TO_FEET 3.28083989501312335958
|
|
|
|
|
|
/* For divide by zero avoidance, this will be close enough to zero */
|
|
#define EPSILON 0.000001
|
|
|
|
|
|
/* Timing constants for Flight Model updates */
|
|
#define DEFAULT_TIMER_HZ 20
|
|
#define DEFAULT_MULTILOOP 6
|
|
#define DEFAULT_MODEL_HZ (DEFAULT_TIMER_HZ * DEFAULT_MULTILOOP)
|
|
|
|
|
|
#endif /* CONSTANTS_H */
|
|
|
|
|
|
/* $Log$
|
|
/* Revision 1.9 1997/08/22 21:34:32 curt
|
|
/* Doing a bit of reorganizing and house cleaning.
|
|
/*
|
|
* Revision 1.8 1997/07/31 22:52:22 curt
|
|
* Working on redoing internal coordinate systems & scenery transformations.
|
|
*
|
|
* Revision 1.7 1997/07/23 21:52:10 curt
|
|
* Put comments around the text after an #endif for increased portability.
|
|
*
|
|
* Revision 1.6 1997/07/21 14:45:01 curt
|
|
* Minor tweaks.
|
|
*
|
|
* Revision 1.5 1997/07/19 23:04:46 curt
|
|
* Added an initial weather section.
|
|
*
|
|
* Revision 1.4 1997/07/19 22:37:03 curt
|
|
* Added various PI definitions.
|
|
*
|
|
* Revision 1.3 1997/07/14 16:26:03 curt
|
|
* Testing/playing -- placed objects randomly across the entire terrain.
|
|
*
|
|
* Revision 1.2 1997/07/08 18:20:11 curt
|
|
* Working on establishing a hard ground.
|
|
*
|
|
* Revision 1.1 1997/07/07 21:02:36 curt
|
|
* Initial revision.
|
|
* */
|