Re: [Plplot-devel] Qt5 support, strange driver output

[António R. T. <ar...@gm...>]

Hi alan
I do not pretend to understand everything you are asking for.
But i think the changes I purpose completely solve the alpha problem in qt
raster drivers.
1) I send you three files of the same plot with a yellow background with
alpha=1, alpha=0.5, Alpha=0 (full background transparency).
then I upload them to a template of the libreoffice impress just to
ilustrate the effect.
2) I think to commit these changes by git someone must give me permition in
the plplot git repository. The other way is I to send to you the qt.cpp and
plqt.cpp changed files.

cheers,



On Mon, Dec 24, 2018 at 2:48 AM Alan W. Irwin <Ala...@gm...>
wrote:

> On 2018-12-23 10:14-0000 António Rodrigues Tomé wrote:
>
> > Just an update.
> > qt drivers do not behave well with alfa values.
> [...]
> > I'll try to upload this changes using git as I cannot find any other
> > problem with qt drivers at least for the use I make of them.
> > (well memqt does not work quite well but neither did memcairo)
>
> Make sure you split your changes into separate commits with appropriate
> commit message.
>
> Will the transparency change you refer to above give us a nice
> semi-transparent background (e.g.,
> with the -bg 000_0.1 command-line option to give a black background with
> alpha=0.1) with
> all qt devices?
>
> I see lots of cool semi-transparent desktop effects on my KDE desktop,
> where you can view one desktop through another.  I would also like to
> see similar effects possible with PLplot where you, for example, can
> view the command-line that produced a plot through the plot, if you use
> a semi-transparent background.
>
> > Have a nice Christmas
>
> You too.
>
> Alan
>
> __________________________
> Alan W. Irwin
>
> Programming affiliations with the FreeEOS equation-of-state
> implementation for stellar interiors (freeeos.sf.net); the Time
> Ephemerides project (timeephem.sf.net); PLplot scientific plotting
> software package (plplot.sf.net); 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
> __________________________
>


-- 

António Rodrigues Tomé
Universidade da Beira Interior
Instituto D. Luís (lab associado)
email address:
ar...@gm...
ar...@ub...
http://www.researcherid.com/rid/A-5681-2013