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.TH "al_fixtan" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_fixtan - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro.h>

al_fixed al_fixtan(al_fixed x);
\f[R]
.fi
.SH DESCRIPTION
.PP
This function finds the tangent of a value using a lookup table.
The input value must be a fixed point binary angle.
.PP
Example:
.IP
.nf
\f[C]
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(\[dq]Precision error: %f\[rs]n\[dq], dif);
\f[R]
.fi
.SH RETURN VALUE
.PP
Returns the tangent of a fixed point binary format angle as a fixed
point value.