This is annoying, but as far as I can tell, is caused by inaccuracies in using the standard libraries' trigonometric functions. Just re-position every time you need to rotate, the effect is very slight.
This is annoying, but as far as I can tell, is caused by inaccuracies in using the standard libraries' trigonometric functions. Just re-position every time you need to rotate, the effect is very slight.