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Scrolling draw window question [message #42466]

Wed, 09 February 2005 17:37

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

Here is a short script that displays an image in a scrolling draw window:

base = WIDGET_BASE()
draw = WIDGET_DRAW(base, RETAIN = 2, $
XSIZE = 400, $
YSIZE = 400, $
X_SCROLL_SIZE = 200, $
Y_SCROLL_SIZE = 400)
WIDGET_CONTROL, BASE, /REALIZE
TVSCL, DIST(400)

The idea is to scroll in only one dimension (horizontal in this case).

When I run this script, the display window appears to be a few pixels
smaller than the image size of 400. As a result, there is a
y-scrollbar; and moving y-slider moves the image up and down slightly.
This is on Mac OS X with X11.

So, how do I make one dimension of the viewable window match the image
size?

(The SCR_XSIZE and SCR_YSIZE keywords seem to make the problem worse.)

Thanks, Ken Bowman

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