How to add stop button to pyqtgraph?

poordev123

I have a program that launches a graph using pyqtgraphing as a pyside2 qt application. What I want to happen is to have the user hit a button and that makes the graph stop. I am setting up the graph like this

def set_up_graph(self):
        QApplication.setAttribute(QtCore.Qt.AA_Use96Dpi)
        pg.setConfigOption('background', 'w')
        pg.setConfigOption('foreground', 'k')
        plot = pg.plot()
        plot.setLabel('bottom', 'Frequency')
        plot.setLabel('left', 'Power Value')
        plot.setWindowTitle('Frequency vs Power Graph')

And then I am actually doing the graphing using this function

def plot_the_graph(self):
    power_vals = [1,2,3,4]
    frequency_values = [5,6,7,8]
    plot.plot(frequency_values, power_vals, clear=True, pen=pg.mkPen('g', width=1.5), symbol='x', name="Power Vs. Frequency")
    QtGui.QGuiApplication.processEvents()

And then I have one other function that determines what button the user has hit

    def multi_graph(self):
        if self.multi:
            self.plot_the_graph()
        self.multi_graph()

I want to add a stop button to these graphs so then I can have it be when the user hits stop then self.multi = False, and then the graph would stop. I can't find a way to just add a stop button to this though.

Currently what's happening is that the graph will just run and run and then eventually I will have 60 popup windows of the graph and I will have to force stop it.

jsulm

@poordev123 said in How to add stop button to pyqtgraph?:

plot = pg.plot()

This is local variable in set_up_graph(self).
So, it is not hte same used in plot_the_graph(self).

I never used PyQtgraph but according to its documentation you should rather do like this:

pw = pg.plot(xVals, yVals, pen='r')  # plot x vs y in red
pw.plot(xVals, yVals2, pen='b')

win = pg.GraphicsWindow()  # Automatically generates grids with multiple items
win.addPlot(data1, row=0, col=0)
win.addPlot(data2, row=0, col=1)
win.addPlot(data3, row=1, col=0, colspan=2)

pg.show(imageData

instead of calling static plot() which creates a new plot at each call.
I suggest you spend some time to read:
https://pyqtgraph.readthedocs.io/en/latest/how_to_use.html
as it is not part of Qt.