X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fconstants.h;h=df0fc8baa3e2d74870ec68551b087322090633d5;hb=59df72c4b07bb7873f39f9a7b4ce1948c52e550a;hp=12345c14746f07e73811fccfcde9431a286bd153;hpb=caaa35e5a7f1bcae598136d8eb9b6588531a87d0;p=simgear.git diff --git a/simgear/constants.h b/simgear/constants.h index 12345c14..df0fc8ba 100644 --- a/simgear/constants.h +++ b/simgear/constants.h @@ -2,7 +2,7 @@ // // 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 library is free software; you can redistribute it and/or // modify it under the terms of the GNU Library General Public @@ -14,10 +14,9 @@ // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Library General Public License for more details. // -// 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. +// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // $Id$ @@ -30,20 +29,10 @@ #define _SG_CONSTANTS_H -#ifdef HAVE_CONFIG_H -# include -#endif - #include -#ifdef SG_HAVE_STD_INCLUDES -# include -#else -# ifdef SG_MATH_EXCEPTION_CLASH -# define exception C_exception -# endif -# include -#endif +#include + #include @@ -52,75 +41,122 @@ // SG_PI and SGD_PI (float and double) come from plib/sg.h -// 2 * PI +/** 2 * PI */ #define SGD_2PI 6.28318530717958647692 -// PI / 2 +/** PI / 2 */ #ifdef M_PI_2 # define SGD_PI_2 M_PI_2 #else # define SGD_PI_2 1.57079632679489661923 #endif -// PI / 4 +/** 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 -// SG_ONE_SECOND is pi/180/60/60, or about 100 feet at earths' equator +/** 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 +/** 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 SG_EQUATORIAL_RADIUS_FT 20925650. // ft -#define SG_EQUATORIAL_RADIUS_M 6378138.12 // meter -// Radius squared -#define SG_EQ_RAD_SQUARE_FT 437882827922500. // ft -#define SG_EQ_RAD_SQUARE_M 40680645877797.1344 // meter +/** Value of earth radius from LaRCsim (ft) */ +#define SG_EQUATORIAL_RADIUS_FT 20925650. + +/** Value of earth radius from LaRCsim (meter) */ +#define SG_EQUATORIAL_RADIUS_M 6378138.12 + +/** Radius squared (ft) */ +#define SG_EQ_RAD_SQUARE_FT 437882827922500. + +/** Radius squared (meter) */ +#define SG_EQ_RAD_SQUARE_M 40680645877797.1344 // Conversions -// Arc seconds to radians // (arcsec*pi)/(3600*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 +/** Radians to arc seconds. (rad*3600*180)/pi = arcsec */ #define SG_RAD_TO_ARCSEC 206264.806247096355156 -// Feet to Meters +/** Feet to Meters */ #define SG_FEET_TO_METER 0.3048 -// Meters to Feet +/** Meters to Feet */ #define SG_METER_TO_FEET 3.28083989501312335958 -// Meters to Nautical Miles, 1 nm = 6076.11549 feet -#define SG_METER_TO_NM 0.00053995680 +/** Meters to Nautical Miles. 1 nm = 6076.11549 feet */ +#define SG_METER_TO_NM 0.0005399568034557235 -// Nautical Miles to Meters +/** Nautical Miles to Meters */ #define SG_NM_TO_METER 1852.0000 -// Radians to Nautical Miles, 1 nm = 1/60 of a degree +/** 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 +/** Nautical Miles to Radians */ #define SG_RAD_TO_NM 3437.7467707849392526 -// For divide by zero avoidance, this will be close enough to zero +/** Miles per second to Knots */ +#define SG_MPS_TO_KT 1.9438444924406046432 + +/** Knots to Miles 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 + +/** Miles per second to Miles per hour */ +#define SG_MPS_TO_MPH 2.2369362920544020312 + +/** Miles per hour to Miles per second */ +#define SG_MPH_TO_MPS 0.44704 + +/** Meters per second to Kilometers per hour */ +#define SG_MPS_TO_KMH 3.6 + +/** Kilometers per hour to Miles per second */ +#define SG_KMH_TO_MPS 0.2777777777777777778 + +/** Pascal to Inch Mercury */ +#define SG_PA_TO_INHG 0.0002952998330101010 + +/** Inch Mercury to Pascal */ +#define SG_INHG_TO_PA 3386.388640341 + + +/** For divide by zero avoidance, this will be close enough to zero */ #define SG_EPSILON 0.0000001 +/** 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 -// 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 backwards compatibility +/** for backwards compatibility */ #define SG_SCENERY_FILE_FORMAT "0.4"