如何在Tkinter画布上更新matplotlib子图？

问题描述

我想更新在tkinter GUI中嵌入Canvas中的子图。无论我尝试什么，我的意图都会失败。看看我有多远：

from tkinter import *
from matplotlib.backends.backend_tkagg import (figureCanvasTkAgg,NavigationToolbar2Tk)
import matplotlib.pyplot as plt
import time

root = Tk()

figId = plt.figure()

canvas = figureCanvasTkAgg(figId,master=root)
canvas.get_tk_widget().pack()
canvas.draw()

vals1 = [5,6,3,9]
vals2 = vals1

for i in range(0,len(vals1)+1):
    toPlot = vals1[0:i]
    plt.subplot(211).plot(toPlot)
    plt.subplot(212).plot(toPlot)
    time.sleep(1)

root.mainloop()

我发现做plt.pause(.1)之类的方法不是正确的方法。对我来说，似乎我必须介绍matplotlib.animation，但我真的不知道该怎么做。

解决方法

我找到了答案：

import random
from itertools import count
import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation
from tkinter import *
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg,NavigationToolbar2Tk)

x_vals = []
y_vals1 = []
y_vals2 = []

index = count()

root = Tk()
figId = plt.figure()
canvas = FigureCanvasTkAgg(figId,master=root)
canvas.get_tk_widget().pack()
canvas.draw()

def animate(i):
    x_vals.append(next(index))
    y_vals1.append(random.randint(0,5))
    y_vals2.append(random.randint(0,5))
    plt.cla()
    plt.plot(x_vals,y_vals1)
    plt.plot(x_vals,y_vals2)

ani = FuncAnimation(plt.gcf(),animate,interval=1000)

root.mainloop()