我正在尝试使用水平滑块更改绘图的xlim。但首先,我不知道如何使用on_changed()方法更新滑块。我对类、对象和对象之间的交互方式没有很好的理解
我将此滑块示例用作模板:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button, RadioButtons
fig, ax = plt.subplots()
plt.subplots_adjust(left=0.25, bottom=0.25)
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 * t)
l, = plt.plot(t, s, lw=2)
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)
sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0, valstep=delta_f)
samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=a0)
def update(val):
amp = samp.val
freq = sfreq.val
l.set_ydata(amp*np.sin(2*np.pi*freq*t))
fig.canvas.draw_idle()
sfreq.on_changed(update)
samp.on_changed(update)
resetax = plt.axes([0.8, 0.025, 0.1, 0.04])
button = Button(resetax, 'Reset', color=axcolor, hovercolor='0.975')
def reset(event):
sfreq.reset()
samp.reset()
button.on_clicked(reset)
rax = plt.axes([0.025, 0.5, 0.15, 0.15], facecolor=axcolor)
radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
def colorfunc(label):
l.set_color(label)
fig.canvas.draw_idle()
radio.on_clicked(colorfunc)
plt.show()
在我的应用程序中实现时遇到问题的部分是:
sfreq.on_changed(update)
samp.on_changed(update)
如果您使用plt.show()打开绘图,它可以正常工作,但是如果您像下面所做的那样将其打包到画布中,它将停止工作。你知道为什么吗
以下是我的应用程序的代码: 更新:我简化了代码以关注问题
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()
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)
canvas = FigureCanvasTkAgg(self.fig, root)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)
graph_exists = True
def update(self, val):
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()
if graph_exists:
self.sfreq.on_changed(update)
self.samp.on_changed(update)
#Run the event loop
root = tk.Tk()
myapp = MyApp(root)
myapp.run()
root.mainloop()
代码的问题是方法
update
从未被调用。。。您需要将部分if graph_exists
放入run
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请尝试下面的代码
正如我在评论中的链接中所说,在打印之前,您需要将图形添加到画布,否则滑块无法工作。此外,在创建滑块后,还应调用
on_changed(...)
相关问题 更多 >
编程相关推荐