如何更改 TextBox 对象的标签位置？

问题描述

TextBox 标签的默认位置在其左侧，如图所示。我想把标签放在盒子下面。这可能吗？

示例代码和图像取自 Matplotlib docs。

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.widgets import TextBox


fig,ax = plt.subplots()
fig.subplots_adjust(bottom=0.2)

t = np.arange(-2.0,2.0,0.001)
l,= ax.plot(t,np.zeros_like(t),lw=2)


def submit(expression):
    """
    Update the plotted function to the new math *expression*.

    *expression* is a string using "t" as its independent variable,e.g.
    "t ** 3".
    """
    ydata = eval(expression)
    l.set_ydata(ydata)
    ax.relim()
    ax.autoscale_view()
    plt.draw()


axBox = fig.add_axes([0.1,0.05,0.8,0.075])
text_Box = TextBox(axBox,"Evaluate")
text_Box.on_submit(submit)
text_Box.set_val("t ** 2")  # Trigger `submit` with the initial string.

plt.show()

解决方法

您可以通过手动更改标签的位置（文本艺术家）来实现。

将此添加到脚本的末尾：

label = text_box.ax.get_children()[1] # label is a child of the TextBox axis
label.set_position([0.5,-.1]) # [x,y] - change here to set the position
# centering the text
label.set_verticalalignment('top')
label.set_horizontalalignment('center')