使用span_where
说明一些用于逻辑掩码为True的阴影区域的辅助函数。
请参考 matplotlib.collections.BrokenBarHCollection.span_where()
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.collections as collections
t = np.arange(0.0, 2, 0.01)
s1 = np.sin(2*np.pi*t)
s2 = 1.2*np.sin(4*np.pi*t)
fig, ax = plt.subplots()
ax.set_title('using span_where')
ax.plot(t, s1, color='black')
ax.axhline(0, color='black', lw=2)
collection = collections.BrokenBarHCollection.span_where(
t, ymin=0, ymax=1, where=s1 > 0, facecolor='green', alpha=0.5)
ax.add_collection(collection)
collection = collections.BrokenBarHCollection.span_where(
t, ymin=-1, ymax=0, where=s1 < 0, facecolor='red', alpha=0.5)
ax.add_collection(collection)
plt.show()
参考
本例中显示了下列函数、方法、类和模块的使用：
import matplotlib
matplotlib.collections.BrokenBarHCollection
matplotlib.collections.BrokenBarHCollection.span_where
matplotlib.axes.Axes.add_collection
matplotlib.axes.Axes.axhline