fixtan.3alleg

Langue: en

Version: version 4.2.2 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

fixtan - Fixed point tangent of binary angles. Allegro game programming library.

SYNOPSIS

#include <allegro.h>

fixed fixtan(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: 
    fixed angle, res_a, res_b;
    float dif;
    
    angle = itofix(37);
    /* Prove that tan(angle) == sin(angle) / cos(angle). */
    res_a = fixdiv(fixsin(angle), fixcos(angle));
    res_b = fixtan(angle);
    dif = fixtof(fixsub(res_a, res_b));
    allegro_message("Precision error: %f\n", dif);

RETURN VALUE

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

SEE ALSO