// effects routine
if (height  > width){
 dz = 2 * height ;
} else {
 dz = 2 * width ;
}
last_letter = numletters - 1;
if (last_letter){
 if (sub_order < 2){
  letter_perc = letter / last_letter;
  if (sub_order == 1) letter_perc = 1 - letter_perc;
 } else if (sub_order < 4){
  my_letter = 2 * letter;
  if (my_letter >= numletters) my_letter = 2 * numletters - my_letter - 2;
  letter_perc = my_letter / last_letter;
  if (sub_order == 3) letter_perc = 1 - letter_perc;
 } else {
  letter_perc = frame / lastsubframe;
 }
 perc = Math.min(1, Math.max(0, 2 * frame / lastsubframe - letter_perc));
} else perc = frame / lastsubframe;
if (reverse_sub_effect == true) perc = 1 - perc;
if (use_centering) ty = 0 else ty = 100 * (1 - perc);
xscale =  1 * perc;
yscale =  1 + (8 * (1 - perc));
xrotate = - x_rotations * 3 * (1 - perc);                     
yrotate = - 720 * (1 - perc) ;
tz = (1 - perc) * dz;

