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I have a large gui app based on matplotlib which is horribly slow (on windows) so I am trying to re-host it on pyqtgraph (which seems to be much faster).

I am facing the following problem: I need to plot very different things (vastly different ranges, axes formatting &c: e.g., sometimes X is $$ from 0 to 1B and sometimes X is time from midnight to now, and sometimes date from last year to now) in the same screen area.

With matplotlib I re-use the same Axes object (pre-inserted in the subplot2grid), because after ax.clear() it is as new and I can set axis formatters and the ax.plot sets xlim and ylim correctly.

With pyqtgraph re-using is much harder because I cannot reset axisItems in a PlotWidget, and pw.clear() does not remove title, axis labels, grids, ticks.

Should I create a new PlotWidget for each plot type and replace it in the layout?

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  • I have no idea how looks your plot but I would use new PlotWidget for each plot (especially if it is simpler) Commented Jul 23 at 14:48
  • In the Initializer, you can create empty PlotDataItems for each type of data you are going to use, and then, when you need to plot, for example, a Date data, you can change the data inside and add it to the PlotWIdget Commented Aug 4 at 13:00
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