al_fixtan man page on DragonFly

al_fixtan man page on DragonFly

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al_fixtan(3)							  al_fixtan(3)

NAME
       al_fixtan - Allegro 5 API

SYNOPSIS
	      #include <allegro5/allegro.h>

	      al_fixed al_fixtan(al_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:

		  al_fixed angle, res_a, res_b;
		  float dif;

		  angle = al_itofix(37);
		  /* Prove that tan(angle) == sin(angle) / cos(angle). */
		  res_a = al_fixdiv(al_fixsin(angle), al_fixcos(angle));
		  res_b = al_fixtan(angle);
		  dif = al_fixtof(al_fixsub(res_a, res_b));
		  printf("Precision error: %f\n", dif);

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

Allegro reference manual					  al_fixtan(3)

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