matplotlib/examples/api/span_regions.py at master · dpsanders/matplotlib · GitHub

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"""

Illustrate some helper functions for shading regions where a logical

mask is True

See :meth:`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()