Add Text into a Rectangle in Matplotlib

To add a text into a rectangle in matplotlib, we can add a label in annotate method at the center point of the rectangle.

Steps

• Create a figure or activate an existing figure using figure() method.

• Add a subplot arrangement in the current axis.

• To add a rectangle in the plot, use Rectangle() class to get the rectangle object.

• Add a rectangle patch on the plot.

• To add text label in the rectangle, we can get the center value of the rectangle, i.e., cx and cy.

• Use annotate() method to place text on the rectangle.

• Limit x and y axes to get a visible rectangle.

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

Example

from matplotlib import pyplot as plt, patches
plt.rcParams["figure.figsize"] = [7.00, 3.50]
plt.rcParams["figure.autolayout"] = True
fig = plt.figure()
ax = fig.add_subplot(111)
rectangle = patches.Rectangle((0, 0), 3, 3, edgecolor='orange',
facecolor="green", linewidth=7)
ax.add_patch(rectangle)
rx, ry = rectangle.get_xy()
cx = rx + rectangle.get_width()/2.0
cy = ry + rectangle.get_height()/2.0
ax.annotate("Rectangle", (cx, cy), color='black', weight='bold', fontsize=10, ha='center', va='center')
plt.xlim([-5, 5])
plt.ylim([-5, 5])
plt.show()

Output