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Shifts the image on the graphbuffer a number of times in a direction indicated below:

left : 1
right : 2
up : 4
up-left : 5
up-right : 6
down : 8
down-left : 9
down-right : 10

Note that any area that does not have new contents shifted onto it, for example the last row of the LCD if the image is shifted up, will be left with its existing contents. If screen_update is zero, the screen will not update. Otherwise, it will update.

Technical Details




Shifts the screen in one of eight possible directions.