Talk:Petit Computer 3/@comment-15296152-20140914230923/@comment-5334617-20140915012952

I just had a thought about the mysterious "XY" and "UV" parameters to SPANIM. It seems to me, sometimes you might want to use coordinates of a sprite in terms of the coordinate system defined by the background, and the background may be scaled and rotated and offset, and sometimes you might want to use coordinates in terms of real pixel positions on the screen. In mathematics, sometimes you see (u,v) as a set of coordinates related to (x,y) in terms of transformations like scaling, rotation, and translation (offset).