C++ (Cpp) det_matrix示例

示例#1

文件： interpolation.c 项目： ReneNyffenegger/flam3

int compare_xforms(const void *av, const void *bv) {
   flam3_xform *a = (flam3_xform *) av;
   flam3_xform *b = (flam3_xform *) bv;
   double aa[2][2];
   double bb[2][2];
   double ad, bd;

   aa[0][0] = a->c[0][0];
   aa[0][1] = a->c[0][1];
   aa[1][0] = a->c[1][0];
   aa[1][1] = a->c[1][1];
   bb[0][0] = b->c[0][0];
   bb[0][1] = b->c[0][1];
   bb[1][0] = b->c[1][0];
   bb[1][1] = b->c[1][1];
   ad = det_matrix(aa);
   bd = det_matrix(bb);

   if (a->color_speed > b->color_speed) return 1;
   if (a->color_speed < b->color_speed) return -1;
   if (a->color_speed) {
      if (ad < 0) return -1;
      if (bd < 0) return 1;
      ad = atan2(a->c[0][0], a->c[0][1]);
      bd = atan2(b->c[0][0], b->c[0][1]);
   }

   if (ad < bd) return -1;
   if (ad > bd) return 1;
   return 0;
}

示例#2

文件： libifs.c 项目： MichaelMure/Gimp-Cage-Tool

static int
compare_xforms (const void *va,
                const void *vb)
{
  double aa[2][2];
  double bb[2][2];
  double ad, bd;
  const xform *a = va;
  const xform *b = vb;

  aa[0][0] = a->c[0][0];
  aa[0][1] = a->c[0][1];
  aa[1][0] = a->c[1][0];
  aa[1][1] = a->c[1][1];
  bb[0][0] = b->c[0][0];
  bb[0][1] = b->c[0][1];
  bb[1][0] = b->c[1][0];
  bb[1][1] = b->c[1][1];
  ad = det_matrix (aa);
  bd = det_matrix (bb);
  if (ad < bd)
    return -1;
  if (ad > bd)
    return 1;
  return 0;
}