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How are we supposed to use this?

The function requires intx, inty, and won't allow me to use doubleintx, or doubleinty.

An actor's coordinate are double ints. So what is actor_to_screen for?

This function is just to reverse the transformation done by the screen_to_actor function.
I'm not sure if is a useful function!

If you need the actor coordinates relative to screen, use the xscreen and yscreen actor variables.

No, that makes sense, to reverse them in the same event that they were switched in the first time.

Thanks!