PyQT5+matplotlib FuncAnimation动态绘制曲线图

#! /usr/bin/env python3
# coding: utf-8

import sys
import os
import random

import matplotlib
# Make sure that we are using QT5
matplotlib.use('Qt5Agg')
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout,QHBoxLayout, QSizePolicy, QWidget, QTextBrowser, QLineEdit
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.animation import FuncAnimation
import matplotlib.pyplot as plt
 
progname = os.path.basename(sys.argv[0])
progversion = "0.1"
 
class MyMplCanvas(FigureCanvas):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        fig = Figure(figsize=(width, height), dpi=dpi)

        self.ax = fig.add_subplot(1,1,1)

        FigureCanvas.__init__(self, fig)
        self.setParent(parent)
        FigureCanvas.setSizePolicy(self,
                                   QtWidgets.QSizePolicy.Expanding,
                                   QtWidgets.QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)
 
class ApplicationWindow(QtWidgets.QMainWindow):
    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setWindowTitle("application main window")
        self.main_widget = QtWidgets.QWidget(self)
        self.xs = []
        self.ys = []
        vbox = QtWidgets.QVBoxLayout(self.main_widget)
 
        self.canvas =  MyMplCanvas( self.main_widget,width=6, height=6, dpi=100) ###attention###
        vbox.addWidget(self.canvas)
 
        hbox = QtWidgets.QHBoxLayout(self.main_widget)
        self.textBrowser = QTextBrowser(self)
        self.lineEdit = QLineEdit(self)
 
        vbox.addWidget(self.textBrowser)
        vbox.addWidget(self.lineEdit)
 
        self.setLayout(vbox)
 
        self.main_widget.setFocus()
        self.setCentralWidget(self.main_widget)
        self.lineEdit.returnPressed.connect(self.update_text)
 
        self.ani = FuncAnimation(self.canvas.figure, self.update_line, interval=10)
 
    def update_line(self, i):
        self.canvas.ax.clear()
        self.canvas.ax.plot(self.xs, self.ys)
 
    def update_text(self):
        self.text = self.lineEdit.text()
        self.textBrowser.append(self.text)
        x, y = self.text.split(',')
        self.xs.append(float(x))
        self.ys.append(float(y))
 
if __name__ == "__main__":
    App = QApplication(sys.argv)
    aw = ApplicationWindow()
    aw.show()
    App.exit()
    sys.exit(App.exec_())