DragonFly On-Line Manual Pages

al_fixcos(3)                                                      al_fixcos(3)

NAME
       al_fixcos - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              al_fixed al_fixcos(al_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:

                  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);

RETURN VALUE
       Returns the cosine of a fixed point binary format angle.  The return
       value will be in radians.

Allegro reference manual                                          al_fixcos(3)