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"""
=================
barbs(X, Y, U, V)
=================
Plot a 2D field of wind barbs.
See `~matplotlib.axes.Axes.barbs`.
"""
import matplotlib.pyplot as plt
import numpy as np
plt.style.use('_mpl-gallery-nogrid')
# make data:
X, Y = np.meshgrid([1, 2, 3, 4], [1, 2, 3, 4])
angle = np.pi / 180 * np.array([[15., 30, 35, 45],
[25., 40, 55, 60],
[35., 50, 65, 75],
[45., 60, 75, 90]])
amplitude = np.array([[5, 10, 25, 50],
[10, 15, 30, 60],
[15, 26, 50, 70],
[20, 45, 80, 100]])
U = amplitude * np.sin(angle)
V = amplitude * np.cos(angle)
# plot:
fig, ax = plt.subplots()
ax.barbs(X, Y, U, V, barbcolor='C0', flagcolor='C0', length=7, linewidth=1.5)
ax.set(xlim=(0, 4.5), ylim=(0, 4.5))
plt.show()
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