emoffatt@sunray.UUCP (Eric Moffatt) (07/14/89)
HELP !!!
I just got the shape-dragging and rubber banding stuff working for a
diagram editor I'm working on and I've come across a nasty performance problem:
All tracking is done using "R2_NOT" raster op and MoveTo/LineTo
pairs. If ALL of the vectors are UNCLIPPED then everything is O.K.
However, CLIPPED vectors which are NOT horizontal or vertical seem
to take an inordinate amout of time to display (read "the tracking
goes for the shits").
This effect is seen on a PS/2 under Windows/386 (v2.10) when running with
VGA. It doesn't appear when running the 8514 Windows.
Is there ANY way to solve this??? (A clipping mode perhaps)
Please e-mail replies (I'm not sure the path works...I don't get much
email from exotic places (Like Toronto :-)). If you bounce, please
post a quickie to at least let me know that the message is getting out.
Thanks,
Eric
--
Eric (Pixel Pusher) Moffatt - Cognos Incorporated: 3755 Riverside Drive
Voice: (613)738-1440 (Research) FAX: (613)738-0002 P.O. Box 9707
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