Re: [Plplot-devel] [RFC] extcairo improvements

[Alan W. I. <ir...@be...>]

On 2009-09-28 13:29-0400 Hazen Babcock wrote:

>> Note, there is no resize currently used in extqt, but I tried something
>> similar to the (now) existing resize and move for the qtwidgets case, and
>> there were no build errors or valgrind errors when I ran
>> examples/c++/qt_example.  However, that example was completely oblivious to
>> PLplot -geometry options (size or offset) so I didn't commit that change.
>> After all, I am only doing this by rote with no sound fundamental knowledge
>> about what I should be doing here.  Thus, I am leaving it to the Qt4/C++
>> experts here to get the -geometry option to work for 
>> examples/c++/qt_example
>> and extqt in general.
>> 
>> Also, I leave it to the cairo experts here to get offsets to work for 
>> xcairo
>> and extcairo.  I hope it will be just as straightforward for them as it
>> was for me for the -dev qtwidget case.
>
> I'm still puzzled as to why this behavior is desired for extcairo &
> extqt. Both of these drivers use an externally supplied "context" to
> render the plot. To me it doesn't seem like a good idea for them to be
> able to move this context around on the screen and/or inside a window. I
> believe this should be the job of the program that supplied the context
> in the first place and that these drivers are doing the right thing by
> ignoring the -geometry option. If we want qt_example to respect the
> -geometry option then this should be done by the main qt window and not by 
> the extqt widget attempting to move & resize its parent window.

I think that is a good argument which certainly simplifies our life. That
just leaves xcairo to be made offset-aware from the above list.

Alan
__________________________
Alan W. Irwin

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the libLASi project (unifont.org/lasi); the Loads of
Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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