fixcos (3) Linux Manual Page

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)