[Development] Qt Charts poor dynamic/resolution with OpenGL

[Jeandet Alexis]

Hi Uwe,
Le mardi 08 novembre 2016 à 15:06 +0000, Uwe Rathmann a écrit :
> On Tue, 08 Nov 2016 13:30:45 +0100, Jeandet Alexis wrote:
> 
> > Our goal is to improve QtCharts to be able to use it in our
> > scientific
> > softwares. So we need to improve the current dynamic with OpenGL
> > and/or
> > improve performances of non OpenGL plots.
> 
> Have you ever considered to use a 3rd party library like Qwt or 
> QCustomPlot. Both packages are available since years and focus on 
> scientific plots.
Indeed I do use QCP on others projects. I would say that QCP is really
nice, its downsampling method is efficient. For QWT I only checked in
the past and I had the feeling that by default you had to do many
things before you get a plot.
On QCP, the main drawbacks are the usage of QMap on pre 2.0 revisions,
the amalgamate on sources(insane for compiler).
We made the choice to use QtCharts for this new software because it is
a Qt module which reduce dependencies and its features are not that far
from what we want. 
We mainly focus on data browsing and plot interactions where QtCharts
appears to be good. That said QWT and QCP are still good candidates
too.
> 
> Being the maintainer of the Qwt package I'm some sort of a biased,
> but my 
> impression is, that the Qt Chart package has never reached a state
> being 
> even close to other solutions. And as I never saw anyone responding
> to 
> related questions on the mailing lists it also does not look like
> being a 
> very actively maintained module.
You are right but I want to give it a chance since it got opened
recently. I don't know why it got opened. I don't know if it is
considered as mature, is it just a toy? Is it abandoned by Digia/Qt?
Personally I don't know many data visualisation applications where
QtCharts would work as-is, as soon as you plot time stamped data you
may quickly fall in our trap.
On the other hand we can see activity on the repository.
So my hope is to get a decent and official Qt plotting module in the
future.
> 
> ciao,
> Uwe
> 
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