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al_fixatan(3) al_fixatan(3)

al_fixatan - Allegro 5 API


#include <allegro5/allegro.h>
al_fixed al_fixatan(al_fixed x)

    

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));

    

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