tkinter 框架中的 MatPlotLib 图形保持完全白色

Question

画布中应该显示的图形没有出现

import tkinter as tk
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTk
import numpy as np

root = tk.Tk()
root.title("Graphique Matplotlib dans Tkinter")
root.geometry("750x500")

t = np.arange(0, 3, 0.01)
fig = plt.figure(figsize=(8, 8))
fig.add_subplot(111).plot(t, 2 * np.sin(2 * np.pi * t))
canvas = FigureCanvasTk(fig, master=root)
canvas.get_tk_widget().place(x=0,y=0)

button = tk.Button(root, text="Cliquez-moi !")
button.pack()

root.mainloop()

我在窗口中显示画布，一个按钮，但图形保持不可见，尽管当我编写 plt.show() 进行测试时它创建得很好。

Answer 1

我有这个，但无法更新工具栏，它不适用于单击按钮后创建的新图表

import random
import tkinter as tk
import matplotlib.pyplot as plt
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2Tk

root = tk.Tk()
canvas = None
toolbar = None

def cplot():
    global canvas, toolbar

    if canvas:
        plt.close()
        canvas.get_tk_widget().pack_forget()

    xCord = [random.randint(0, 10) for i in range(5)]
    yCord = [random.randint(0, 10) for i in range(5)]

    fig, ax = plt.subplots()
    plt.plot(xCord, yCord)

    canvas = FigureCanvasTkAgg(fig, master=root)
    canvas.draw()
    canvas.get_tk_widget().pack()

    if not toolbar:
        toolbar = NavigationToolbar2Tk(canvas, root)
        canvas.get_tk_widget().pack()
    else:
        toolbar.update()

bouton = tk.Button(root, text="Changer", command=cplot)
bouton.pack()

cplot()

root.mainloop()