PyQtGraph plotting over time

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1. from PyQt5 import QtWidgets, QtCore
   
2. from pyqtgraph import PlotWidget, plot
   
3. import pyqtgraph as pg
   
4. import sys  # We need sys so that we can pass argv to QApplication
   
5. import os
   
6. from random import randint
   
7. 
   
8. class MainWindow(QtWidgets.QMainWindow):
   
9. 
   
10.     def __init__(self, *args, **kwargs):
    
11.         super(MainWindow, self).__init__(*args, **kwargs)
    
12. 
    
13.         self.graphWidget = pg.PlotWidget()
    
14.         self.setCentralWidget(self.graphWidget)
    
15. 
    
16.         self.x = list(range(100))  # 100 time points
    
17.         self.y = [randint(0,100) for _ in range(100)]  # 100 data points
    
18. 
    
19.         self.graphWidget.setBackground('w')
    
20. 
    
21.         pen = pg.mkPen(color=(255, 0, 0))
    
22.         self.data_line =  self.graphWidget.plot(self.x, self.y, pen=pen)
    
23. 
    
24.         self.timer = QtCore.QTimer()
    
25.         self.timer.setInterval(50)
    
26.         self.timer.timeout.connect(self.update_plot_data)
    
27.         self.timer.start()
    
28. 
    
29.     def update_plot_data(self):
    
30. 
    
31.         self.x = self.x[1:]  # Remove the first y element.
    
32.         self.x.append(self.x[-1] + 1)  # Add a new value 1 higher than the last.
    
33. 
    
34.         self.y = self.y[1:]  # Remove the first
    
35.         self.y.append( randint(0,100))  # Add a new random value.
    
36. 
    
37.         self.data_line.setData(self.x, self.y)  # Update the data.
    
38. 
    
39. 
    
40. app = QtWidgets.QApplication(sys.argv)
    
41. w = MainWindow()
    
42. w.show()
    
43. sys.exit(app.exec_())

複製代碼

Matplotlib 轉移至 PyQtGraph 製作Real Time Curve