1 # -*- coding: utf-8 -*- 2  3 import sys 4 from PyQt5 import QtWidgets 5  6 import numpy as np 7 from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas 8 from matplotlib.figure import Figure 9 from matplotlib.animation import FuncAnimation10 11 class MyMplCanvas(FigureCanvas):12     """Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""13     def __init__(self, parent=None, width=5, height=4, dpi=100):14         fig = Figure(figsize=(width, height), dpi=dpi)15         self.axes = fig.add_subplot(111)16         # We want the axes cleared every time plot() is called17         self.axes.hold(False)18 19         self.compute_initial_figure()20 21         #22         FigureCanvas.__init__(self, fig)23         self.setParent(parent)24 25     def compute_initial_figure(self):26         pass27 28 class AnimationWidget(QtWidgets.QWidget):29     def __init__(self):30         QtWidgets.QWidget.__init__(self)31 32         vbox = QtWidgets.QVBoxLayout()33         self.canvas = MyMplCanvas(self, width=5, height=4, dpi=100)34         vbox.addWidget(self.canvas)35         36         hbox = QtWidgets.QHBoxLayout()37         self.start_button = QtWidgets.QPushButton("start", self)38         self.stop_button = QtWidgets.QPushButton("stop", self)39         self.start_button.clicked.connect(self.on_start)40         self.stop_button.clicked.connect(self.on_stop)41         hbox.addWidget(self.start_button)42         hbox.addWidget(self.stop_button)43         vbox.addLayout(hbox)44         self.setLayout(vbox)45         46         self.x = np.linspace(0, 5*np.pi, 400)47         self.p = 0.048         self.y = np.sin(self.x + self.p)49         self.line, = self.canvas.axes.plot(self.x, self.y, animated=True, lw=2)50         51     def update_line(self, i):52         self.p += 0.153         y = np.sin(self.x + self.p)54         self.line.set_ydata(y)55         return [self.line]56         57     def on_start(self):58         self.ani = FuncAnimation(self.canvas.figure, self.update_line, 59                                  blit=True, interval=25)60     61     def on_stop(self):62         self.ani._stop()63 64 if __name__ == "__main__":65     qApp = QtWidgets.QApplication(sys.argv)66     aw = AnimationWidget()67     aw.show()68     sys.exit(qApp.exec_())