更改matplotlib.slider标签文本大小

Question

我想制作绘图并使用滑块更改其属性。但matplotlib.widgets.Slider的标签文字对我来说非常小。我在网上冲浪找到了如何改变它的答案，但我没有运气。

代码的关键部分是：

E0_slider_ax = fig.add_axes([0.6, 0.2, 0.25, 0.03], axisbg=axis_color)
E0_slider = mw.Slider(E0_slider_ax, r'$\epsilon_0$', 1,  100, valinit = E0)
# I want to make r'$\epsilon_0$' bigger

我尝试为标签制作文字，如下：

t = matplotlib.text.Text(r'$\epsilon_0$', size = 22)
E0_slider = mw.Slider(E0_slider_ax, label = t, valmin = 1, valmax = 100, valinit = E0)

但它给我一个错误：

Traceback (most recent call last):

  File "<ipython-input-53-2310b0749547>", line 1, in <module>
    runfile('C:/Users/Robert/Desktop/multidif_S.py', 
wdir='C:/Users/Robert/Desktop')

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-
packages\spyderlib\widgets\externalshell\sitecustomize.py", line 845, in 
runfile
    execfile(filename, namespace)

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-
packages\spyderlib\widgets\externalshell\sitecustomize.py", line 103, in 
execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Robert/Desktop/multidif_S.py", line 64, in <module>
    E0_slider = mw.Slider(E0_slider_ax, label = t, valmin = 1, valmax = 100, 
valinit = E0)

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-packages\matplotlib\widgets.py", line 376, in __init__
    horizontalalignment='right')

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-packages\matplotlib\axes\_axes.py", line 623, in text
    x=x, y=y, text=s)

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-packages\matplotlib\text.py", line 220, in __init__
    self.set_text(text)

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-packages\matplotlib\text.py", line 1206, in set_text
    self._text = '%s' % (s,)

  File "C:\Users\Robert\Desktop\WinPython-64bit-3.5.2.2\python-
3.5.2.amd64\lib\site-packages\matplotlib\text.py", line 186, in __str__
    return "Text(%g,%g,%s)" % (self._x, self._y, repr(self._text))

TypeError: a float is required

请求帮助！

Answer 1

首先创建滑块，然后使用E0_slider.label.set_size()更新标签文字大小。

您不需要先创建matplotlib.text.Text实例，只需使用该字符串作为标签。

E0_slider_ax = fig.add_axes([0.6, 0.2, 0.25, 0.03], axisbg=axis_color)
E0_slider = mw.Slider(E0_slider_ax, r'$\epsilon_0$', 1,  100, valinit = E0)

E0_slider.label.set_size(22)

更改标签大小：

要

Answer 2

您无法向label参数提供文本。但您可以在之后更改标签尺寸。该标签以Slider.label形式提供，并且作为matplotlib.text.Text实例，可以使用set_size更改大小。

import matplotlib.pyplot as plt
import matplotlib.widgets

fig = plt.figure()

E0_slider_ax = fig.add_axes([0.6, 0.2, 0.25, 0.03], facecolor="skyblue")
E0_slider =  matplotlib.widgets.Slider(E0_slider_ax, r'$\epsilon_0$', 1,  100, valinit = 50)
E0_slider.label.set_size(40)

plt.show()