fixatan man page

fixatan — Fixed point inverse tangent lookup table. Allegro game programming library.


#include <allegro.h>

fixed fixatan(fixed x);


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

fixed result;

/* Sets `result' to binary angle 13. */
result = fixatan(ftofix(0.326));

Return Value

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


Allegro version 4.4.2 Allegro manual