使用 span_where

说明一些用于对逻辑掩码为 True 的区域进行着色的辅助函数。

见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

此示例中显示了以下函数、方法、类和模块的使用：

• matplotlib.collections.BrokenBarHCollection

• matplotlib.collections.BrokenBarHCollection.span_where

• matplotlib.axes.Axes.add_collection

• matplotlib.axes.Axes.axhline