Create arrows in matplotlib using annotate

Question

I'm annotating my plot with

plt.annotate(
    '30.2',
    xy=(3, y),
    xycoords='data',
    xytext=(3, y - 5),
    textcoords='data',
    arrowprops=dict(facecolor='black', arrowstyle="->")
)

It creates downward arrows as expected but they are not completely vertical.

If I change '30.2' to a en empty string '', they are vertical.

How can I make sure the arrows are vertical no matter how long the text string is?

can you show us an SSCCE?

shx2
– shx2

2015-05-02 10:54:00 +00:00
Commented May 2, 2015 at 10:54 — shx2
– shx2, Commented May 2, 2015 at 10:54

Julien Spronck · Accepted Answer · 2015-05-02 11:09:39Z

2

It's just a matter of text alignment. Try this:

plt.annotate(
    '30.2',
    xy=(3, y),
    xycoords='data',
    xytext=(3, y - 5),
    textcoords='data',
    horizontalalignment='center',
    arrowprops=dict(facecolor='black', arrowstyle="->")
)

answered May 2, 2015 at 11:09

Julien Spronck

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