fixatan (3) Linux Manual Page

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

Synopsis

#include <allegro.h>

fixed fixatan(fixed x);

Description

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.

See Also