1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
.TH "al_fixcos" "3" "" "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 as a fixed point
value.
|
