Re: [Plplot-devel] Different background colours for different pages of a multi-page plot

[Andrew R. <and...@us...>]

Alan,

A simple change - now committed. Other devices explicitly set the
background colour with each call to plD_bop_xw. Incidentally the 
old version worked with the -db option (double buffering) since
the buffer pixmap was set to the background colour for each page,
but the non-buffered version didn't work as in this case the
background colour wasn't being set for each page. The xwin fix also
fixes the tk device.

Andrew

On Sun, May 01, 2011 at 06:51:15PM -0700, Alan Irwin wrote:
> The ability mentioned in the subject line is an unpublished PLplot
> feature that I have used recently for the -colorbar subset of C
> example 33.  Since this is an unpublished feature (the documentation
> says plscolbg should be called before plinit), I have tried example 33
> (using the -colorbar option) for a number of different devices.  All
> the modern devices I have tried (xcairo, qt_widget, psc, wxwidgets,
> svg) work fine with the specified different background colour starting
> on the first page of the -colorbar pages (the fifth page of example 33
> if the -colorbar example option is used), but -dev xwin (and -dev tk
> which uses -dev xwin code) do not work properly.  For those devices
> the -colorbar pages of example 33 initially have black backgrounds
> rather than the specified (unsaturated green) background. However, you
> get the correct background if you resize the plot.  Also, if you
> attempt to resize page 4 the initially correct black background
> for that page is turned into the background colour appropriate
> to page 5.
> 
> pladv(0) is largely equivalent to a call to pleop() followed by a call
> to plbop().  Thus, I suspect the trouble might be that -dev xwin handles end
> of page and beginning of page with a different style than the modern
> devices, e.g., by not setting the background colour properly at the
> correct place. Could somebody with knowledge of -dev xwin take a look
> to see if it can be brought into line with the style of modern devices
> with regard to page and background colour handling?
> 
> The ability to set different background colours for different pages of
> a multi-page plot is well worth publicizing since the ability is quite
> useful, but I would like to hold off on changing the plscolbg
> documentation until we completely understand (and fix) why -dev xwin
> (and -dev tk) don't respond the same way as modern devices to a call
> to plscolbg (just before a call to pladv(0) in the example 33 case).
> So I hope somebody with knowledge of -dev xwin will take on this
> issue.
> 
> 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).
> __________________________
> 
> Linux-powered Science
> __________________________
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