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al_fixacos(3alleg5) Allegro reference manual() | al_fixacos(3alleg5) Allegro reference manual() |
NAME¶
al_fixacos - Allegro 5 APISYNOPSIS¶
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#include <allegro5/allegro.h> al_fixed al_fixacos(al_fixed x);
DESCRIPTION¶
This function finds the inverse cosine of a value using a lookup table. The input must be a fixed point value. The inverse cosine is defined only in the domain from -1 to 1. Outside of this input range, the function will set Allegro's errno to EDOM and return zero.Example:
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al_fixed result; /* Sets result to binary angle 128. */ result = al_fixacos(al_itofix(-1));