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Re-organized PI related constants.

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curt 1998-05-17 16:56:47 +00:00
parent 042ec53cf3
commit a12259feb7
1 changed files with 17 additions and 7 deletions
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22
fg_constants.h
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@ -37,20 +37,27 @@
#endif
/* Make sure PI is defined in its various forms */
// 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 /* pi */
# define FG_PI 3.14159265358979323846
#endif
// 2 * PI
#define FG_2PI 6.28318530717958647692
// PI / 2
#ifdef M_PI_2
# define FG_PI_2 M_PI_2
#else
# define FG_PI_2 1.57079632679489661923 /* pi/2 */
# define FG_PI_2 1.57079632679489661923
#endif
#define FG_2PI (FG_PI + FG_PI) /* 2*pi */
// PI / 4
#define FG_PI_4 0.78539816339744830961
/* Radius of Earth in kilometers at the equator. Another source had
@ -127,9 +134,12 @@
/* $Log$
/* Revision 1.4 1998/05/16 13:03:10 curt
/* Defined field of view max/min limits.
/* Revision 1.5 1998/05/17 16:56:47 curt
/* Re-organized PI related constants.
/*
* Revision 1.4 1998/05/16 13:03:10 curt
* Defined field of view max/min limits.
*
* Revision 1.3 1998/04/08 23:35:32 curt
* Tweaks to Gnu automake/autoconf system.
*