Got it! For any resolution (width,height) at screen center (xpos,ypos), the top left corner of a window will be equivalent to, for a layer with speeds (xspeed,yspeed), pixel
(int((xpos-160)*xspeed-(width-320)/2), int((ypos-100)*yspeed-limitvisibleregion-(height-200)/2)).
(xpos, ypos, xspeed, and yspeed are here in nice, pretty units, rather than multiples of 65536; adjust accordingly for your own needs.)
(holds true for layers 1-7 only.)
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Last edited by Violet CLM; Oct 20, 2010 at 03:23 PM.
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