fixcos(3)
NAME
fixcos – Fixed point cosine of binary angles. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed fixcos(fixed x);
DESCRIPTION
This function finds the cosine of a value using a lookup table. The input value must be a fixed point binary angle. Example:
fixed angle;
float result;
/* Set the binary angle to 45 degrees. /
angle = itofix(32);
/ The cosine of 45 degrees is about 0.7071. */
result = fixtof(fixcos(angle));
ASSERT(result > 0.7 && result < 0.71);
RETURN VALUE
Returns the cosine of a fixed point binary format angle. The return value will be in radians.
SEE ALSO
, ex12bit(3), ex3buf(3), exblend(3), excustom(3), exspline(3), exupdate(3)