Multiple plots blocks the window

[Diego Fernando]

Hi guys,

I'm trying to plot in real time several data in different plots. At firts it works great but after some time the window blocks but keeps plotting the data.

I'm getting the data from a thread. and the code I'm using to plot looks like this:

        self.pg_plot_one.plot(

           range(self.n)[d:],

           self.y1[d:],

           pen=(1, 3),

           antialias=True,

           name="x axis"

       )

        self.pg_plot_one.plot(

           range(self.n)[d:],

           self.y2[d:],

           pen=(2, 3),

           antialias=True,

           name="y axis"

       )

Any suggestions?

Thanks

[vas...@gmail.com]

Hi Diego,

With pg.plot (http://www.pyqtgraph.org/documentation/functions.html#pyqtgraph.plot) you create a new PlotWindow every time you start this function, but you need to create them just one time and then fill with setData (http://www.pyqtgraph.org/documentation/graphicsItems/plotcurveitem.html#pyqtgraph.PlotCurveItem.setData) function. So, you are overloading (probably) ViewBox with lots of a new plots.

You should do something like this:

// initalize the PlotWindows

self.pg_plot_one_1 = self.pg_plot_one.plot() 

self.pg_plot_one_2 = self.pg_plot_one.plot()   

then in a loop:

    self.pg_plot_one.setRange(xRange=range(self.n)[d:]) // maybe this line not need in a loop. look at http://www.pyqtgraph.org/documentation/graphicsItems/viewbox.html#pyqtgraph.ViewBox.setRange

self.pg_plot_one_1.setData(self.y1[d:], pen=(1, 3), antialias=True)

self.pg_plot_one_2.setData(self.y2[d:], pen=(2, 3), antialias=True)  

Of course, it is the best that you make combination you need.

Good luck,

Vasilije

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[Diego Fernando]

Thank you so much. That was it.