如何使用Matplotlib在图的中间绘制轴 [英] How to draw an axis in the middle of the figure using Matplotlib

问题描述

我想画一条平行于y轴且在x轴中间的静态垂直线.当图中的一个平移时，该行不应移动. 我的目标是使图中间的垂直线作为参考线.我将使用其他一些数字来表示数据，这些数据将取决于x轴中间的x值.

I would like to draw a static vertical line that is parallel to the y-axis and which is at the middle of the x-axis. This line should not move when one pan in the figure. My goal is to have this vertical line in the middle of the figure as a reference line. I will have some other figures which represent data that will depend on the x value which is at the middle of the x-axis.

推荐答案

该行端点的坐标在轴坐标中为(0.5，0)和(0.5，1):

The coordinates of the endpoints of that line are (0.5, 0) and (0.5, 1) in axis coordinates:

from matplotlib.lines import Line2D
from matplotlib import pyplot

f=pyplot.figure()
a=f.add_subplot(111)
a.plot([3,1,4,1,5,9,2], color='k') # so you have some content
a.add_line(Line2D([0.5, 0.5], [0, 1], transform=a.transAxes,
                  linewidth=2, color='b'))
pyplot.show()

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