Some definitions:
The drawing-buffer-coordinate of a Field is the coordinate of the pixel in the column of the most western pixel and the row of the most northern pixel of the Field.
An absolute paint-coordinate is a coordinate relative to the viewportPosition (0,0). NOTE that no negative x or y-values are allowed for such a coordinate!!!
(Really?) An unscrolled array-coordinate is an array-coordinate that is not necessarily within map.
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