注意
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使用 fill_between 对由逻辑掩码定义的区域进行阴影处理#
import matplotlib.pyplot as plt
import numpy as np
t = np.arange(0.0, 2, 0.01)
s = np.sin(2*np.pi*t)
fig, ax = plt.subplots()
ax.plot(t, s, color='black')
ax.axhline(0, color='black')
ax.fill_between(t, 1, where=s > 0, facecolor='green', alpha=.5)
ax.fill_between(t, -1, where=s < 0, facecolor='red', alpha=.5)
plt.show()
