al_fixatan - Allegro 5 API

       This function finds the inverse tangent of a value using a lookup table.  The input must be a fixed point
       value.  The inverse tangent is the value whose tangent is x.

       Example:

              al_fixed result;

              /* Sets result to binary angle 13. */
              result = al_fixatan(al_ftofix(0.326));

       al_fixatan - Allegro 5 API

       Returns the inverse tangent of a fixed point value, measured as a fixed point binary format angle.

Allegro reference manual                                                                     al_fixatan(3alleg5)

              #include <allegro5/allegro.h>

              al_fixed al_fixatan(al_fixed x)