Matplotlib – 单选按钮

单选按钮让用户只能在多个选项中选择一个选项。这些按钮以两个或更多为一组排列，并带有圆点列表。要使单选按钮保持响应，您必须保留对此对象的引用。我们使用 on_clicked 方法连接 RadioButtons 以使其响应。

句法：

matplotlib.widgets.RadioButtons(ax, labels, active=0, activecolor=’blue’)

Parameters:

• ax: The axes to which the radio buttons add.
• labels: button labels(list of str).
• active: Index of the initially selected button.
• activecolor: Color of the selected button.

下面是描述如何使用 matplotlib 库创建和使用单选按钮的各种示例。

示例 1：

Python3

# import required modules as numpy,
# matplotlib and radiobutton widget
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import RadioButtons
 
# x and y-coordinates for graph creation
x = np.linspace(0, 2*np.pi, 200)
y = np.cos(x**2)
 
# Creating subplot and adjusting subplot
fig, ax = plt.subplots()
l, = ax.plot(x, y, color='yellow')
plt.subplots_adjust(left=0.4)
ax.set_title('Plot with RadioButtons',
             fontsize=18)
 
# sub-plot for radio button with
# left, bottom, width, height values
rax = plt.axes([0.1, 0.15, 0.2, 0.2])
radio_button = RadioButtons(rax, ('yellow',
                                  'red',
                                  'blue',
                                  'green'))
 
# function performed on switching the
# radiobuttons
def colorfunc(label):
    l.set_color(label)
    plt.draw()
 
 
radio_button.on_clicked(colorfunc)
 
plt.show()

输出：

示例 2：

蟒蛇3

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import RadioButtons
 
# plotting between the interval -π and π
x = np.linspace(-np.pi, np.pi)
 
# trigonometric functions to plot
p = 2*np.sin(x)
q = np.sin(x)
r = np.cos(x)
s = 2*np.cos(x)
 
fig, ax = plt.subplots()
l, = ax.plot(x, p, lw=3, color='green')
plt.subplots_adjust(left=0.3)
 
rax = plt.axes([0.05, 0.7, 0.15, 0.2])
radio = RadioButtons(rax, ('2sin(x)',
                           'sin(x)',
                           'cos(x)',
                           '2cos(x)'))
 
# function performed on clicking the radio buttons
def sinefunc(label):
    sindict = {'2sin(x)': p,
               'sin(x)': q,
               'cos(x)': r,
               '2cos(x)': s}
    data = sindict[label]
    l.set_ydata(data)
    plt.draw()
 
 
radio.on_clicked(sinefunc)
 
# plot grid
ax.grid()
plt.show()

输出：

示例 3：

蟒蛇3

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import RadioButtons
 
# plotting between the interval -π and π
x = np.linspace(-np.pi, np.pi)
 
# trigonometric functions to plot
p = 2*np.sin(x)
q = np.sin(x)
r = np.cos(x)
s = 2*np.cos(x)
fig, ax = plt.subplots()
 
l, = ax.plot(x, p, lw=3, color='red')
plt.subplots_adjust(left=0.3)
 
rax = plt.axes([0.05, 0.7, 0.15, 0.2])
radio = RadioButtons(rax, ('2sin(x)',
                           'sin(x)',
                           'cos(x)',
                           '2cos(x)'))
 
# function performed on clicking the radio buttons
def sinefunc(label):
    sindict = {'2sin(x)': p,
               'sin(x)': q,
               'cos(x)': r,
               '2cos(x)': s}
    data = sindict[label]
    l.set_ydata(data)
    plt.draw()
 
 
radio.on_clicked(sinefunc)
 
# plot grid
ax.grid()
 
# x and y-coordinates for graph creation
x = np.linspace(0, 2*np.pi, 200)
y = np.cos(x**2)
 
# sub-plot for radio button with
# left, bottom, width, height values
rax2 = plt.axes([0.05, 0.15, 0.15, 0.2])
radio_button = RadioButtons(rax2, ('red',
                                   'blue',
                                   'green'))
 
# function performed on switching radiobuttons
def colorfunc(label2):
    l.set_color(label2)
    plt.draw()
 
 
radio_button.on_clicked(colorfunc)
 
plt.show()

输出：