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This commit is contained in:
curt
2001-03-24 04:21:37 +00:00
parent caaa35e5a7
commit 98a65b5d1d
1 changed files with 35 additions and 26 deletions
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61
simgear/constants.h
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@@ -52,75 +52,84 @@
// 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
// 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
/** Meters to Nautical Miles. 1 nm = 6076.11549 feet */
#define SG_METER_TO_NM 0.00053995680
// 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
/** 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
/** 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
/** 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"