.\" Generated by the Allegro makedoc utility
.TH fixtan 3alleg4 "version 4.4.3" "Allegro" "Allegro manual"
.SH NAME
fixtan \- Fixed point tangent of binary angles. Allegro game programming library.\&
.SH SYNOPSIS
.B #include <allegro.h>

.sp
.B fixed fixtan(fixed x);
.SH DESCRIPTION
This function finds the tangent of a value using a lookup table. The input
value must be a fixed point binary angle. Example:

.nf
   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);
.fi
.SH "RETURN VALUE"
Returns the tangent of a fixed point binary format angle. The return value
will be in radians.

.SH SEE ALSO