fixasin man page on DragonFly

fixasin man page on DragonFly

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fixasin(3)			Allegro manual			    fixasin(3)

NAME
       fixasin	- Fixed point inverse sine lookup table. Allegro game program‐
       ming library.

SYNOPSIS
       #include <allegro.h>

       fixed fixasin(fixed x);

DESCRIPTION
       This function finds the inverse sine of a value using a	lookup	table.
       The  input  value  must	be  a  fixed  point value. The inverse sine is
       defined only in the domain from `-1' to	`1'.  Outside  of  this	 input
       range, the function will set `errno' to EDOM and return zero. Example:

	  float angle;
	  fixed val;

	  /* Sets `val' to a right binary angle (`64'). */
	  val = fixasin(itofix(1));
	  /* Sets `angle' to 0.2405. */
	  angle = fixtof(fixmul(fixasin(ftofix(0.238)), fixtorad_r));
	  /* This will trigger the assert. */
	  val = fixasin(ftofix(-1.09));
	  ASSERT(!errno);

RETURN VALUE
       Returns	the  inverse  sine  of	a fixed point value, measured as fixed
       point binary format angle, or zero if the input was out of  the	range.
       All return values of this function will be in the range `-64' to `64'.

SEE ALSO
Allegro				 version 4.4.2			    fixasin(3)

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