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.TH "al_fixtan" "3" "" "Allegro reference manual" ""
.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[]
.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("Precision\ error:\ %f\\n",\ dif);
\f[]
.fi
.SH RETURN VALUE
.PP
Returns the tangent of a fixed point binary format angle as a fixed
point value.
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