NAME¶

al_fixtan - Allegro 5 API

SYNOPSIS¶

#include <allegro5/allegro.h>

al_fixed al_fixtan(al_fixed x);
    

DESCRIPTION¶

This function finds the tangent of a value using a lookup table. The input value must be a fixed point binary angle. Example:

    al_fixed angle, res_a, res_b;
    float dif;

    angle = al_itofix(37);
    /* Prove that tan(angle) == sin(angle) / cos(angle). */
    res_a = al_fixdiv(al_fixsin(angle), al_fixcos(angle));
    res_b = al_fixtan(angle);
    dif = al_fixtof(al_fixsub(res_a, res_b));
    printf("Precision error: %f\n", dif);
    

RETURN VALUE¶

Returns the tangent of a fixed point binary format angle. The return value will be in radians.