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"""
===============
Axis Equal Demo
===============
How to set and adjust plots with equal axis ratios.
"""
import matplotlib.pyplot as plt
import numpy as np
# Plot circle of radius 3.
an = np.linspace(0, 2 * np.pi, 100)
fig, axs = plt.subplots(2, 2)
axs[0, 0].plot(3 * np.cos(an), 3 * np.sin(an))
axs[0, 0].set_title('not equal, looks like ellipse', fontsize=10)
axs[0, 1].plot(3 * np.cos(an), 3 * np.sin(an))
axs[0, 1].axis('equal')
axs[0, 1].set_title('equal, looks like circle', fontsize=10)
axs[1, 0].plot(3 * np.cos(an), 3 * np.sin(an))
axs[1, 0].axis('equal')
axs[1, 0].axis([-3, 3, -3, 3])
axs[1, 0].set_title('still a circle, even after changing limits', fontsize=10)
axs[1, 1].plot(3 * np.cos(an), 3 * np.sin(an))
axs[1, 1].set_aspect('equal', 'box')
axs[1, 1].set_title('still a circle, auto-adjusted data limits', fontsize=10)
fig.tight_layout()
plt.show()
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