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output history help
Date: Mon, 17 Sep 90 16:35:22 EDT
From: sims@starbase.MITRE.ORG (Jim Sims)
I have an application that uses a map *much* larger than the screen, that I
want to draw lines on. I wrote a function to do rubber-banding lines using
dw:tracking-mouse, drawing and XORing the lines to get the rubber-band effect.
Whenever I scroll the lines off-screen and scroll back to them, *ALL* the
rubber-banded segments get redrawn (UGLYYYY!!) as weel as the final (intended)
I tried wrapping a (dw:with-output-recording-disabled ()) around the:
portions of the functions doing the graphics:draw-line
both of above,
to no avail....
Thanks in advance,
What you tried should have helped, but it is only part of the solution
you're looking for. I suspect you just needed to supply the optional
stream argument to dw:with-output-recording-disabled to avoid the
awkward scrolling behavior you describe. You will then also want to
draw the finalized line segment(s) ONCE after sketching is completed
(outside of the dw:with-output-recording-disabled body) to get the
desired line(s) to show up properly in the presence of scrolling, etc.