/****************************************************************************/
/* (C) Copyright 1993 Universidade Estadual de Campinas (UNICAMP)           */
/*                    Campinas, SP, Brazil                                  */
/*                                                                          */
/* This file can be freely distributed, modified, and used for any          */
/*   non-commercial purpose, provided that this copyright and authorship    */
/*   notice be included in any copy or derived version of this file.        */
/*                                                                          */
/* DISCLAIMER: This software is offered ``as is'', without any guarantee    */
/*   as to fitness for any particular purpose.  Neither the copyright       */
/*   holder nor the authors or their employers can be held responsible for  */
/*   any damages that may result from its use.                              */
/****************************************************************************/

char *aat_ftag = "f2";
char *aat_fname = 
  "r2 = x^2 + y^2;\nxy = x*y;\nfa = (r^2 + xy - 1/4)^3;\nfb = (r^2 - xy - 1/4)^3;\nf = fa + fb - fa*fb";

Float aat_f_flt (Float x, Float y)
  {
    ROUND_NEAR;
    {
      Float ha = x*x + y*y + x*y - Quarter;
      Float fa = ha*ha*ha;
      Float hb = x*x + y*y - x*y - Quarter;
      Float fb = hb*hb*hb;
      Float res = (fa + fb - fa*fb);
      return (res);
    }
  }

Interval aat_f_ia (Interval x, Interval y)
  {
    Interval x2 = ia_sqr(x);
    Interval y2 = ia_sqr(y);
    Interval r2 = ia_add(x2, y2);
    Interval xy = ia_mul(x, y);
    Interval ha = ia_shift(ia_add(r2, xy), -Quarter);
    Interval fa = ia_mul(ia_sqr(ha), ha);
    Interval hb = ia_shift(ia_sub(r2, xy), -Quarter);
    Interval fb = ia_mul(ia_sqr(hb), hb);
    Interval fafb = ia_mul(fa, fb);
    Interval res = ia_sub (ia_add(fa, fb), fafb);
    return (res);
  }

AAP aat_f_aa (AAP x, AAP y)
  {
    MemP frame = aa_top();
    AAP x2 = aa_sqr(x);
    AAP y2 = aa_sqr(y);
    AAP r2 = aa_add(x2, y2);
    AAP xy = aa_mul(x, y);
    AAP ha = aa_shift(aa_add(r2, xy), -Quarter);
    AAP fa = aa_mul(aa_sqr(ha), ha);
    AAP hb = aa_shift(aa_sub(r2, xy), -Quarter);
    AAP fb = aa_mul(aa_sqr(hb), hb);
    AAP fafb = aa_mul(fa, fb);
    AAP res = aa_sub (aa_add(fa, fb), fafb);
    return (aa_return(frame, res));
  }

Interval aat_fxd = {-One, One};
Interval aat_fyd = {-One, One};

int aat_fn = 32;