[mcclim-devel] incremental redisplay and with-first-quadrant-coordinates
Christophe Rhodes
csr21 at cam.ac.uk
Mon Jun 27 14:49:28 UTC 2005
Timothy Moore <moore at bricoworks.com> writes:
> I've started to take a look at this. Christophe pointed out that the
> code that checks the stream cursor is only checking the x coordinate;
> apparently a bug, but this change was specifically made during
> Gilbert's rewrite of the compute-difference-set code, so I don't think
> it's right to check both x and y without understanding what he's doing
> there. Gilbert? :)
I don't think that's the bug -- without removing the y-coordinate
check, no output record is ever /moved/ even if it's unchanged apart
from its stream-position. (I think actually that the x-coordinate
shouldn't be checked either: that way arbitrary translations of
output-records would be possible. I don't know why that wasn't
implemented at the time...)
Cheers,
Christophe
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