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

al_fixed\ al_fixcos(al_fixed\ x);
\f[]
.fi
.SH DESCRIPTION
.PP
This function finds the cosine 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;
\ \ \ \ float\ result;

\ \ \ \ /*\ Set\ the\ binary\ angle\ to\ 45\ degrees.\ */
\ \ \ \ angle\ =\ al_itofix(32);

\ \ \ \ /*\ The\ cosine\ of\ 45\ degrees\ is\ about\ 0.7071.\ */
\ \ \ \ result\ =\ al_fixtof(al_fixcos(angle));
\ \ \ \ assert(result\ >\ 0.7\ &&\ result\ <\ 0.71);
\f[]
.fi
.SH RETURN VALUE
.PP
Returns the cosine of a fixed point binary format angle.
The return value will be in radians.