<p>代码的问题是方法<code>update</code>从未被调用。。。您需要将部分<code>if graph_exists</code>放入<code>run</code>方法中。此外,正如@acw1668共享帖子中所建议的,您还需要在绘图之前将图形添加到画布中</p>
<p>请尝试下面的代码</p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button, RadioButtons
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import(FigureCanvasTkAgg, NavigationToolbar2Tk)
from tkinter import *
import tkinter as tk
global running
running = True
global graph_exists
graph_exists = False
class MyApp:
def __init__(self, parent):
self.myParent = parent ###remember my parent, the root
self.sfreq = 0
self.samp = 0
def run(self):
self.fig, self.ax = plt.subplots()
canvas = FigureCanvasTkAgg(self.fig, root)
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
plt.subplots_adjust(left=0.25, bottom=0.25)
self.t = np.arange(0.0, 1.0, 0.001)
a0 = 5
f0 = 3
delta_f = 5.0
s = a0 * np.sin(2 * np.pi * f0 * self.t)
self.l, = plt.plot(self.t, s, lw=2)
self.ax.margins(x=0)
axcolor = 'lightgoldenrodyellow'
axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], facecolor=axcolor)
axamp = plt.axes([0.25, 0.15, 0.65, 0.03], facecolor=axcolor)
self.sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0, valstep=delta_f)
self.samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=a0)
graph_exists = True
if graph_exists:
self.sfreq.on_changed(self.update)
self.samp.on_changed(self.update)
def update(self, val):
print('inside update')
amp = self.samp.val
freq = self.sfreq.val
self.l.set_ydata(amp*np.sin(2*np.pi*freq*self.t))
self.fig.canvas.draw_idle()
#Run the event loop
root = tk.Tk()
myapp = MyApp(root)
myapp.run()
root.mainloop()
</code></pre>