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Article #564

floating Coord round-off

#564
From: Donn Cave
Date: Tue, 01 Sep 1992 16:03
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In 3.0.1, it sometimes seems that the actual size and position of
elements on the screen is slightly more variable than one would expect,
and I have been thinking that this is because of round-off errors between
InterViews' floating point coordinate system, and X's integer screen
coordinates.

For example, the outset frame around a series of pushbuttons will be slightly
larger below one button than the rest.  It's particularly spectacular when
scrolled by small increments - the window seems to undulate.

This is on a 100dpi screen, using the default "Motif" kit.

Is there something one can do to avoid this effect?  (Assuming that it's
still around in 3.1.  Am certainly relieved to hear that 3.1 will have a
monochrome kit, by the way.)

	Donn Cave, University Computing Services, University of Washington
	donn@cac.washington.edu
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From: donn@carson.u.washington.edu (Donn Cave)
Newsgroups: comp.windows.interviews
Subject: floating Coord round-off
Message-ID: <1992Sep1.160341.13749@u.washington.edu>
Date: 1 Sep 92 16:03:41 GMT
Article-I.D.: u.1992Sep1.160341.13749
Sender: news@u.washington.edu (USENET News System)
Organization: University of Washington
Lines: 18