| Refresh policies for DRAW widgets in IDL [message #3949] |
Mon, 20 March 1995 13:53 |
Russ Welti
Messages: 27
Registered: October 1994
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Junior Member |
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Hi "IDLers" !
When my application loads an image (tiff file) of larger than
some certain limit (not known yet) the main viewing DRAW widget
will not refresh itself when user scrolls around.
It makes no difference which of the 2 RETAIN policies below I use.
draw = WIDGET_DRAW(base, $
/BUTTON_EVENTS, $
/MOTION_EVENTS, $
/FRAME, $
RETAIN = 2, $ ;Make sure IDL provides backing store.
;RETAIN = 1, $ ;Ask X server to provide it.
UVALUE = 'DRAW_WIN_EVENT', $
X_SCROLL_SIZE = view_x, $
Y_SCROLL_SIZE = view_y, $
XSIZE = size_x, $
YSIZE = size_y)
I use an X term with 8MB RAM, running Solaris2.3 on a Sparc LX.
Using X Backingstore is most successful, working for images of
at least 1.5MB image data. But when I switch to a 7MB file,
the image appears once correctly, but as soon as you
scroll, nothing "scrolls" into view, and you have to refresh the
window with TV or whatever.
It doesn't surprise me that my X terminal maxes out at some limit
of backingstore abilities, but when I the IDL refresh mechanism
does not seem to work either.
Has anyone had any experience with this phenomenon?
Thanks a bunch,
Russ
Russ Welti /-\
(c-g)
University of Washington \-/
Dept. of Molecular Biotechnology M/S FJ-20 /
Seattle, WA 98195 /-\
(206) 685-3840 voice (a-t)
(206) 685-7344 FAX \-/
rwelti@u.washington.edu \
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