Using kqmlgraphplugin in Plasma Next
sebastiangottfried at web.de
Fri Jan 31 19:54:55 GMT 2014
> Currently I am working on a QML Canvas based SignalPlotter, to replace
> the old Plasma1SignalPlotter which is KSignalPlotter and
> QGraphicWidget based. My SignalPlotter is in bshah/plotter-qml branch
> of plasma-framework
Conceptually charts and signal plotters are pretty different. A plotter tracks
a value of a fixed amount of time (set by the available horizontal space) and
cuts earlier values off. Charts on the contrary display whatever they are told
to do. Both are useful and should IMO coexist.
> Meanwhile I was notified by apol that something like this already
> exist, which is QML, So basically my plan is to port kqmlgraphplugin
> to KDE Frameworks 5 and use it to plot data in Plasma Next.
> I am interested in porting it to KDE Frameworks 5. Is someone already
> working on that? If yes can I help with that? Otherwise I will start
> to port it. :)
Sure, go for it.
It needs to be investigated what the best porting strategy is. Three ways come
The easy way: use QPaintedItem. Very straightforward, but virtually no gain in
comparison to the Qt Quick 1 version since the continued use of software
Canvas based: I have no experience with that but I guess performance is should
be better than with QPaintedItem, since it directly renders to a GPU
framebuffer and painting can be done in an separate thread.
Shader based: Perform the actual rendering in a fragment shader. Definitely
the most ambitious and complicated solution, but also the only with pure GPU
rendering. I don't know if it's really worth the effort.
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