[PyQt5]动态显示matplotlib作图

Posted 2020-11-23 john-xiong

完整实例

 1 import sys
 2 
 3 from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget,  4     QPushButton
 5 from PyQt5.QtGui import QIcon
 6 
 7 from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
 8 from matplotlib.figure import Figure
 9 import matplotlib.pyplot as plt
10 from PyQt5.QtCore import QTimer
11 import random
12 import numpy as np
13 from scipy import interpolate
14 
15 
16 class App(QMainWindow):
17 
18     def __init__(self):
19         super().__init__()
20         self.left = 10
21         self.top = 10
22         self.title = ‘这里可以修改标题‘
23         self.width = 640
24         self.height = 400
25         self.initUI()
26 
27     def initUI(self):
28         self.setWindowTitle(self.title)
29         self.setGeometry(self.left, self.top, self.width, self.height)
30 
31         m = PlotCanvas(self, width=5, height=4)#实例化一个画布对象
32         m.move(0, 0)
33 
34         button = QPushButton(‘这是一个按钮‘, self)
35         button.setToolTip(‘This s an example button‘)
36         button.move(500, 0)
37         button.resize(140, 100)
38         button.clicked.connect(m.plot)
39 
40         self.show()
41 
42 
43 class PlotCanvas(FigureCanvas):
44 
45     def __init__(self, parent=None, width=5, height=4, dpi=100):
46         fig = Figure(figsize=(width, height), dpi=dpi)
47         self.axes = fig.add_subplot(111)
48 
49         FigureCanvas.__init__(self, fig)
50         self.setParent(parent)
51 
52         FigureCanvas.setSizePolicy(self,
53                                    QSizePolicy.Expanding,
54                                    QSizePolicy.Expanding)
55         FigureCanvas.updateGeometry(self)
56         self.init_plot()#打开App时可以初始化图片
57         #self.plot()
58 
59     def plot(self):
60 
61         timer = QTimer(self)
62         timer.timeout.connect(self.update_figure)
63         timer.start(100)
64 
65     def init_plot(self):
66         x = [1, 2, 3, 4, 5, 6, 7, 8, 9]
67         y = [23, 21, 32, 13, 3, 132, 13, 3, 1]
68         self.axes.plot(x, y)
69 
70     def update_figure(self):
71         x = np.linspace(0, 10, 10)
72         y = [random.randint(0, 10) for i in range(10)]
73         xx = np.linspace(0, 10)
74         f = interpolate.interp1d(x, y, ‘quadratic‘)  # 产生插值曲线的函数
75         yy = f(xx)
76         self.axes.cla()
77         self.axes.plot(x, y, ‘o‘,xx,yy)
78         self.draw()
79 
80 
81 
82 if __name__ == ‘__main__‘:
83     app = QApplication(sys.argv)
84     ex = App()
85     sys.exit(app.exec_())
86 
87 
88 
89 if __name__ == ‘__main__‘:
90     app = QApplication(sys.argv)
91     ex = App()
92     sys.exit(app.exec_())