---
name: "al_fixatan"
section: "3alleg5"
platform: "linux"
package: "allegro5-doc"
version: "2:5.2.10.1+dfsg-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/al_fixatan/3alleg5"
---

# al\_fixatan(3alleg5)

Allegro 5 API

## NAME

al\_fixatan - Allegro 5 API

## SYNOPSIS

-

  ```
  #include <allegro5/allegro.h>
  al_fixed al_fixatan(al_fixed x)
  ```

## DESCRIPTION

This function finds the inverse tangent of a value using a lookup table. The input must be a fixed point value. The inverse tangent is the value whose tangent is `x`.

Example:

-

  ```
  al_fixed result;
  /* Sets result to binary angle 13. */
  result = al_fixatan(al_ftofix(0.326));
  ```

## RETURN VALUE

Returns the inverse tangent of a fixed point value, measured as a fixed point binary format angle.