CODEWITHSUNDEEP
pythonmatplotliblineaxes
pierolefou
pierolefou

Reputation: 675

How to draw an axis in the middle of the figure using Matplotlib

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.

Upvotes: 2

Views: 5588

Answers (1)

Jouni K. Seppänen
Jouni K. Seppänen

Reputation: 44152

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()

Upvotes: 4

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