How To Pass Changing/updating Data To Another Pop-up Window?

I got the following code for Python GUI. I found I cannot update the data running in the main window to the pop-up window. In this example I use some random data to mimic the video

Solution 1:

I did some changes to your power_window class:

classpower_window(QMainWindow):
    # this window has no parent. It will appear as a free-floating window as we want.def__init__(self,parent):
        super().__init__()
        self.setWindowTitle("Total power in the frame")
        self.main_widget = QWidget()  
        self.main_layout = QGridLayout()  
        self.main_widget.setLayout(self.main_layout)  
        self.setCentralWidget(self.main_widget)  
 
        self.plot_plt = pg.PlotWidget()   # this is our plot canvas
        self.plot_plt.showGrid(x=True,y=True) # show grid
        self.main_layout.addWidget(self.plot_plt, 1, 0, 3, 3)
 
        # self.plot_plt.setYRange(max=100,min=0)
        self.parent = parent
        self.data_list = []
        parent.timer.timeout.connect(self.plot_data) # update plot# parent.updateData.change.connect(self.plot_data) # not working, may need to use pyqtSignal for custom signals
        
        self.plot_data()

    defplot_data(self):
        self.frame_sum_data = self.parent.updateData()
        self.data_list.append(self.frame_sum_data)
        self.plot_plt.plot().setData(self.data_list,pen='g') # change the color of the pen

I think the problem is because your program calls the updateData() on the __init__ so it only gets the first value and never again updates that value.

Tell me if it does what you want.

Solution 2:

Above is what the demo looks like. The pop-up window shows the 'real-time' sum-up values in the left view. The right view shows the FFT of the left.