X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fconstants.h;h=f0a094350f05457f55f55b5383311cca206955b7;hb=15399bfe95b1b6e3f60371c514da5a42200de223;hp=d74b2b40c562ee9373ed1e99f4091c93ce987fe1;hpb=9fabeb77bc12f8d7abb8a72cdb52218cb05910a1;p=simgear.git diff --git a/simgear/constants.h b/simgear/constants.h index d74b2b40..f0a09435 100644 --- a/simgear/constants.h +++ b/simgear/constants.h @@ -4,140 +4,129 @@ // // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org // -// 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 library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Library 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 +// This library 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. +// Library 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. +// You should have received a copy of the GNU Library General Public +// License along with this library; if not, write to the +// Free Software Foundation, Inc., 59 Temple Place - Suite 330, +// Boston, MA 02111-1307, USA. // // $Id$ +/** \file constants.h + * Various constant definitions. + */ + #ifndef _SG_CONSTANTS_H #define _SG_CONSTANTS_H -#ifdef HAVE_CONFIG_H -# include -#endif - #include -#ifdef FG_HAVE_STD_INCLUDES +#ifdef SG_HAVE_STD_INCLUDES # include #else -# ifdef FG_MATH_EXCEPTION_CLASH +# ifdef SG_MATH_EXCEPTION_CLASH # define exception C_exception # endif # include #endif +#include + // Make sure PI is defined in its various forms -// PI, only PI, and nothing but PI -#ifdef M_PI -# define FG_PI M_PI -#else -# define FG_PI 3.14159265358979323846 -#endif +// SG_PI and SGD_PI (float and double) come from plib/sg.h -// 2 * PI -#define FG_2PI 6.28318530717958647692 +/** 2 * PI */ +#define SGD_2PI 6.28318530717958647692 -// PI / 2 +/** PI / 2 */ #ifdef M_PI_2 -# define FG_PI_2 M_PI_2 +# define SGD_PI_2 M_PI_2 #else -# define FG_PI_2 1.57079632679489661923 +# define SGD_PI_2 1.57079632679489661923 #endif -// PI / 4 -#define FG_PI_4 0.78539816339744830961 +/** PI / 4 */ +#define SGD_PI_4 0.78539816339744830961 -#ifndef M_E -# define M_E 2.7182818284590452354 +/** \def SG_E "e" */ +#ifdef M_E +# define SG_E M_E +#else +# define SG_E 2.7182818284590452354 #endif -// ONE_SECOND is pi/180/60/60, or about 100 feet at earths' equator -#define ONE_SECOND 4.848136811E-6 +/** pi/180/60/60, or about 100 feet at earths' equator */ +#define SG_ONE_SECOND 4.848136811E-6 -// Radius of Earth in kilometers at the equator. Another source had -// 6378.165 but this is probably close enough -#define EARTH_RAD 6378.155 +/** Radius of Earth in kilometers at the equator. Another source had + * 6378.165 but this is probably close enough */ +#define SG_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_M 6378138.12 // meter -// Radius squared -#define RESQ_FT 437882827922500. // ft -#define RESQ_M 40680645877797.1344 // meter +/** Value of earth radius from LaRCsim (ft) */ +#define SG_EQUATORIAL_RADIUS_FT 20925650. -// 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 +/** Value of earth radius from LaRCsim (meter) */ +#define SG_EQUATORIAL_RADIUS_M 6378138.12 -// Time Related Parameters - -#define MJD0 2415020.0 -#define J2000 (2451545.0 - MJD0) -#define SIDRATE .9972695677 +/** Radius squared (ft) */ +#define SG_EQ_RAD_SQUARE_FT 437882827922500. +/** Radius squared (meter) */ +#define SG_EQ_RAD_SQUARE_M 40680645877797.1344 // Conversions -// Degrees to Radians -#define DEG_TO_RAD 0.017453292 // deg*pi/180 = rad +/** Arc seconds to radians. (arcsec*pi)/(3600*180) = rad */ +#define SG_ARCSEC_TO_RAD 4.84813681109535993589e-06 + +/** Radians to arc seconds. (rad*3600*180)/pi = arcsec */ +#define SG_RAD_TO_ARCSEC 206264.806247096355156 -// Radians to Degrees -#define RAD_TO_DEG 57.29577951 // rad*180/pi = deg +/** Feet to Meters */ +#define SG_FEET_TO_METER 0.3048 -// Arc seconds to radians // (arcsec*pi)/(3600*180) = rad -#define ARCSEC_TO_RAD 4.84813681109535993589e-06 +/** Meters to Feet */ +#define SG_METER_TO_FEET 3.28083989501312335958 -// Radians to arc seconds // (rad*3600*180)/pi = arcsec -#define RAD_TO_ARCSEC 206264.806247096355156 +/** Meters to Nautical Miles. 1 nm = 6076.11549 feet */ +#define SG_METER_TO_NM 0.00053995680 -// Feet to Meters -#define FEET_TO_METER 0.3048 +/** Nautical Miles to Meters */ +#define SG_NM_TO_METER 1852.0000 -// Meters to Feet -#define METER_TO_FEET 3.28083989501312335958 +/** Radians to Nautical Miles. 1 nm = 1/60 of a degree */ +#define SG_NM_TO_RAD 0.00029088820866572159 -// Meters to Nautical Miles, 1 nm = 6076.11549 feet -#define METER_TO_NM 0.00053995680 +/** Nautical Miles to Radians */ +#define SG_RAD_TO_NM 3437.7467707849392526 -// Nautical Miles to Meters -#define NM_TO_METER 1852.0000 +/** For divide by zero avoidance, this will be close enough to zero */ +#define SG_EPSILON 0.0000001 -// Radians to Nautical Miles, 1 nm = 1/60 of a degree -#define NM_TO_RAD 0.00029088820866572159 -// Nautical Miles to Radians -#define RAD_TO_NM 3437.7467707849392526 +/** Highest binobj format version we know how to read/write. This starts at + * 0 and can go up to 65535 */ +#define SG_BINOBJ_VERSION 5 -// For divide by zero avoidance, this will be close enough to zero -#define FG_EPSILON 0.0000001 +/** for backwards compatibility */ +#define SG_SCENERY_FILE_FORMAT "0.4" #endif // _SG_CONSTANTS_H