if x < 0 then you need (512 + x) = xoffset
if y < 0 then you need (256 + y) = yoffset

as offsets are not signed values I believe this gives the corect results for
(-) x and y values.
-dovoto

-----Original Message-----
From: kervinyy@... [mailto:kervinyy@...]
Sent: Tuesday, May 01, 2001 4:32 PM
To: gbadev@yahoogroups.com
Subject: [gbadev] Question about sprite coordinates


Are the object coordinate value in OAM unsigned?
If it is,how do you make the effect that a sprite's
upper/left is out of the screen?If it's signed,8 bit
sprite can only have a max vertical offset of 127...
And,is that value relative to display screen?

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