在 matplotlib 小部件(Python 2.7)中单击按钮时提取/打印滑块值

问题描述：

我正在使用 Matplotlib 滑块小部件的模板.我正在使用 this 模板.如何更改重置"按钮下的脚本以打印出 Amp 和 Freq 滑块的值?

I am using the template for the Matplotlib slider widget. I am using this template. How can I alter the script under the "Reset" button to print out the value of the Amp and Freq sliders?

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button, RadioButtons

ax = plt.subplot(111)
plt.subplots_adjust(left=0.25, bottom=0.25)
t = np.arange(0.0, 1.0, 0.001)
a0 = 5
f0 = 3
s = a0*np.sin(2*np.pi*f0*t)
l, = plt.plot(t,s, lw=2, color='red')
plt.axis([0, 1, -10, 10])

axcolor = 'lightgoldenrodyellow'
axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], axisbg=axcolor)
axamp  = plt.axes([0.25, 0.15, 0.65, 0.03], axisbg=axcolor)

sfreq = Slider(axfreq, 'Freq', 0.1, 30.0, valinit=f0)
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))
    plt.draw()
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], axisbg=axcolor)
radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
def colorfunc(label):
    l.set_color(label)
    plt.draw()
radio.on_clicked(colorfunc)

plt.show()

答

在上面的代码中，将 reset 函数替换为类似

In the code above replace the reset function by something like

def reset(event):
    print "Amplitude: ",  samp.val
    #sfreq.reset()
    #samp.reset()

在 matplotlib 小部件(Python 2.7)中单击按钮时提取/打印滑块值

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