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# 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() (opens new window)

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()

使用span_where示例

# 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

# 下载这个示例