al_fixsin - Man Page

#include <allegro5/allegro.h>

al_fixed al_fixsin(al_fixed x);

This function finds the sine of a value using a lookup table. The input value must be a fixed point binary angle.

Example:

al_fixed angle;
int result;

/* Set the binary angle to 90 degrees. */
angle = al_itofix(64);

/* The sine of 90 degrees is one. */
result = al_fixtoi(al_fixsin(angle));
assert(result == 1);

Returns the sine of a fixed point binary format angle as a fixed point value.