Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
fixtan(3)			Allegro	manual			     fixtan(3)

NAME
       fixtan -	Fixed point tangent of binary angles. Allegro game programming
       library.

SYNOPSIS
       #include	<allegro.h>

       fixed fixtan(fixed x);

DESCRIPTION
       This function finds the tangent of a value using	a  lookup  table.  The
       input value must	be a fixed point binary	angle. Example:

	  fixed	angle, res_a, res_b;
	  float	dif;

	  angle	= itofix(37);
	  /* Prove that	tan(angle) == sin(angle) / cos(angle). */
	  res_a	= fixdiv(fixsin(angle),	fixcos(angle));
	  res_b	= fixtan(angle);
	  dif =	fixtof(fixsub(res_a, res_b));
	  allegro_message("Precision error: %f\n", dif);

RETURN VALUE
       Returns	the  tangent  of a fixed point binary format angle. The	return
       value will be in	radians.

SEE ALSO
Allegro				 version 4.4.2			     fixtan(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=fixtan&sektion=3&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help