X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fconstants.h;h=8438e1321f08ff6d8af22886024dd21717f146f8;hb=1f37095087fa7aa3d210ba134058b86c3bd6d69e;hp=d74b2b40c562ee9373ed1e99f4091c93ce987fe1;hpb=9fabeb77bc12f8d7abb8a72cdb52218cb05910a1;p=simgear.git diff --git a/simgear/constants.h b/simgear/constants.h index d74b2b40..8438e132 100644 --- a/simgear/constants.h +++ b/simgear/constants.h @@ -2,142 +2,162 @@ // // Written by Curtis Olson, started February 2000. // -// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org +// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt/ // -// 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. +// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 -# include -#else -# ifdef FG_MATH_EXCEPTION_CLASH -# define exception C_exception -# endif -# include -#endif +#include + + +#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 +// Maximum terrain elevation from sea level +#define SG_MAX_ELEVATION_M 9000.0 // 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 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 (ft) */ +#define SG_EQUATORIAL_RADIUS_FT 20925650. -// Time Related Parameters +/** Value of earth radius from LaRCsim (meter) */ +#define SG_EQUATORIAL_RADIUS_M 6378138.12 -#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 + +/** Feet to Meters */ +#define SG_FEET_TO_METER 0.3048 + +/** Meters to Feet */ +#define SG_METER_TO_FEET 3.28083989501312335958 + +/** Meters to Nautical Miles. 1 nm = 6076.11549 feet */ +#define SG_METER_TO_NM 0.0005399568034557235 + +/** Nautical Miles to Meters */ +#define SG_NM_TO_METER 1852.0000 + +/** Meters to Statute Miles. */ +#define SG_METER_TO_SM 0.0006213699494949496 + +/** Statute Miles to Meters. */ +#define SG_SM_TO_METER 1609.3412196 + +/** Radians to Nautical Miles. 1 nm = 1/60 of a degree */ +#define SG_NM_TO_RAD 0.00029088820866572159 + +/** Nautical Miles to Radians */ +#define SG_RAD_TO_NM 3437.7467707849392526 + +/** meters per second to Knots */ +#define SG_MPS_TO_KT 1.9438444924406046432 + +/** Knots to meters per second */ +#define SG_KT_TO_MPS 0.5144444444444444444 + +/** Feet per second to Knots */ +#define SG_FPS_TO_KT 0.5924838012958962841 + +/** Knots to Feet per second */ +#define SG_KT_TO_FPS 1.6878098571011956874 -// Radians to Degrees -#define RAD_TO_DEG 57.29577951 // rad*180/pi = deg +/** meters per second to Miles per hour */ +#define SG_MPS_TO_MPH 2.2369362920544020312 -// Arc seconds to radians // (arcsec*pi)/(3600*180) = rad -#define ARCSEC_TO_RAD 4.84813681109535993589e-06 +/** meetrs per hour to Miles per second */ +#define SG_MPH_TO_MPS 0.44704 -// Radians to arc seconds // (rad*3600*180)/pi = arcsec -#define RAD_TO_ARCSEC 206264.806247096355156 +/** Meters per second to Kilometers per hour */ +#define SG_MPS_TO_KMH 3.6 -// Feet to Meters -#define FEET_TO_METER 0.3048 +/** Kilometers per hour to meters per second */ +#define SG_KMH_TO_MPS 0.2777777777777777778 -// Meters to Feet -#define METER_TO_FEET 3.28083989501312335958 +/** Pascal to Inch Mercury */ +#define SG_PA_TO_INHG 0.0002952998330101010 -// Meters to Nautical Miles, 1 nm = 6076.11549 feet -#define METER_TO_NM 0.00053995680 +/** Inch Mercury to Pascal */ +#define SG_INHG_TO_PA 3386.388640341 -// Nautical Miles to Meters -#define NM_TO_METER 1852.0000 -// Radians to Nautical Miles, 1 nm = 1/60 of a degree -#define NM_TO_RAD 0.00029088820866572159 +/** For divide by zero avoidance, this will be close enough to zero */ +#define SG_EPSILON 0.0000001 -// 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 6 -// 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