39 lines
805 B
Python
39 lines
805 B
Python
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"""
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Illustrate some helper functions for shading regions where a logical
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mask is True
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See :meth:`matplotlib.collections.BrokenBarHCollection.span_where`
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"""
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import numpy as np
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import matplotlib.pyplot as plt
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import matplotlib.collections as collections
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t = np.arange(0.0, 2, 0.01)
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s1 = np.sin(2*np.pi*t)
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s2 = 1.2*np.sin(4*np.pi*t)
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fig = plt.figure()
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ax = fig.add_subplot(111)
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ax.set_title('using span_where')
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ax.plot(t, s1, color='black')
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ax.axhline(0, color='black', lw=2)
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collection = collections.BrokenBarHCollection.span_where(
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t, ymin=0, ymax=1, where=s1>0, facecolor='green', alpha=0.5)
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ax.add_collection(collection)
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collection = collections.BrokenBarHCollection.span_where(
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t, ymin=-1, ymax=0, where=s1<0, facecolor='red', alpha=0.5)
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ax.add_collection(collection)
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plt.show()
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