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RE: [XaraXtreme-dev] Strange rendering problem
- From: "Gavin Theobald" <GavinT@xxxxxxxx>
- Date: Wed, 29 Mar 2006 16:54:17 +0100
- Subject: RE: [XaraXtreme-dev] Strange rendering problem
I've not been able to reproduce the problem, but I've checked in some
CDraw and XaraLX changes. Does this fix the problem?
From: owner-dev@xxxxxxxxxxxxxxxx [mailto:owner-dev@xxxxxxxxxxxxxxxx] On
Behalf Of Martin Wuerthner
Sent: 29 March 2006 11:23
Subject: [XaraXtreme-dev] Strange rendering problem
Is it just me or do others see this rendering problem, too? This is on
x86, SuSE 10.0, wxWidgets 2.6.3-rc2, source revision 731 without any
changes, debug build.
At certain zoom percentages a spurious black background appears that
is of the size of the bounding box of all objects on the page. The
background can be wiped away by moving an object over it but reappears
when the area is scrolled into view again.
This is how I can provoke the problem reliably:
1. Start XaraLX
2. Create a new file - it will be displayed at 100% zoom
3. Draw an ellipse in the middle of the page and set its size to 500
by 300 pixels.
4. Give it a red fill (not necessary to trigger the problem but it
shows more clearly what is going on later)
5. Select the magnifier tool and change to 202% zoom.
Here, this causes a black background the size of the ellipse's
bounding box to appear underneath the ellipse. If additional objects
are drawn the background extends to encompass their bounding boxes. If
the zoom percentage is changed to 200%, the problem goes away, but it
occurs at many other zoom levels, too, though usually "even" levels
like 500% work fine.
310% works fine
311% goes wrong
312%-314% go wrong
315% works fine
316%-318% go wrong
319% works fine
320% goes wrong
The Double buffering and Background rendering entries in the Debug
menu do not have any effect, by the way.
I have an old revision around (609), which works fine in this respect,
so the error has been introduced somewhere inbetween.