How to center an annotation horizontally over a point in Matplotlib?

To center an annotation horizontally over a point, we can take the following steps−

• Create points for x and y using numpy.
• Create labels using xpoints.
• Use scatter() method to scatter the points.
• Iterate labels, xpoints and ypoints and annotate the plot with label, x and y with different properties, make horizontal alignment ha=center.
• To display the figure, use show() method.

Example

import numpy as np
from matplotlib import pyplot as plt
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
xpoints = np.linspace(1, 10, 10)
ypoints = np.random.rand(10)
labels = ["%.2f" % i for i in xpoints]
plt.scatter(xpoints, ypoints, c=xpoints)
for label, x, y in zip(labels, xpoints, ypoints):
plt.annotate(
   label,
   xy=(x, y), xytext=(-20, 20),
   textcoords='offset points', ha='center', va='bottom',
   bbox=dict(boxstyle='round,pad=0.5', fc='green', alpha=0.5),
   arrowprops=dict(arrowstyle='->', connectionstyle='arc3,rad=0'))
plt.show()

Output

Rishikesh Kumar Rishi

Updated on: 07-May-2021

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