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Man Pages


Manual Reference Pages  -  AL_FIXACOS (3)

NAME

al_fixacos - Allegro 5 API

CONTENTS

Synopsis
Description
Return Value

SYNOPSIS

C]
#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 value must be a fixed point radian. The inverse cosine is defined only in the domain from -1 to 1. Outside of this input range, the function will set Allegro[aq]s errno to EDOM and return zero.

Example:
C]
    al_fixed result;

/* Sets result to binary angle 128. */ result = al_fixacos(al_itofix(-1)); ]

RETURN VALUE

Returns the inverse sine of a fixed point value, measured as fixed point binary format angle, or zero if the input was out of range. All return values of this function will be in the range 0 to 128.

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Allegro reference manual AL_FIXACOS (3)

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