How to label a patch in matplotlib?

To label a patch in matplotlib, we can take the following steps −

  • Set the figure size and adjust the padding between and around the subplots.

  • Initialize the center of the rectangle patch.

  • Create a new figure or activate an existing figure.

  • Add an 'ax' to the figure as part of a subplot arrangement.

  • Add a 'rectangle' to the axes' patches; return the patch.

  • Place a legend on the figure.

  • To display the figure, use show() method.


import matplotlib.pyplot as plt
import matplotlib.patches as patches

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

x = y = 0.1
fig = plt.figure()
ax = fig.add_subplot(111)

patch = ax.add_patch(patches.Rectangle((x, y), 0.5, 0.5, alpha=0.5, facecolor='red', label='Rectangle'))

plt.legend(loc='upper right')