al_fixtan (3alleg5)

• #include <allegro5/allegro.h>
  
  al_fixed al_fixtan(al_fixed x);
  
  

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);
  
  

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