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A simple example of top down movement using trigonometry for accurate spacing on the diagonal.
I can't do much about the jittery diagonal control, this is due to it being low resolution pixel perfect movement.
This idea for this upload is to help people have a simple base without relying on the xx/yy method which doesn't take into account pythagoras theorem.
Do with it as you wish, I would love to see it smoothed out without being too complicated to understand.
Remember to change to _update60() if you prefer.
Replaced True/False with 1/_
Now even more compact with a shorter method.