Till now any post in this year. So let mine will be first
I can say to Lucky that this method about which he asked is simplificied way of mine play which i played long time ago.
In that time i not had computer, so i used simply timer or say some time count and signal. So in that set time i simply observed ball movement counted it how much way ball done, from thta way i had some special table done -how much way i must wait that will be left always the same way for ball. So if to look to ball as to timer - ball simply get me signal when is left some specifical time till end.
So in this moment i had initial number and number when left is som almoust ideally the same time.
It is not hard to conect theese two numbers to one function. But i noticed that this is only for me not hard - for others this is - mission - impossible .
So i decided to do one even more simple variant… for theese others :).