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Backport PR #24843 on branch v3.6.x (Show that fill_between and span_where provide similar functionalities.) #24852

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Merged
merged 1 commit into from
Jan 1, 2023
Merged

Backport PR #24843 on branch v3.6.x (Show that fill_between and span_where provide similar functionalities.) #24852

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41 changes: 19 additions & 22 deletions examples/lines_bars_and_markers/span_regions.py
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Original file line number Diff line number Diff line change
@@ -1,12 +1,10 @@
"""
================
Using span_where
================
========================================================================
Shade regions defined by a logical mask using fill_between or span_where
========================================================================

Illustrate some helper functions for shading regions where a logical
mask is True.

See `matplotlib.collections.BrokenBarHCollection.span_where`.
Shade regions where a logical mask is True with `.Axes.fill_between` or with
`matplotlib.collections.BrokenBarHCollection.span_where`.
"""

import numpy as np
Expand All @@ -15,23 +13,22 @@


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)
s = np.sin(2*np.pi*t)

collection = collections.BrokenBarHCollection.span_where(
t, ymin=0, ymax=1, where=s1 > 0, facecolor='green', alpha=0.5)
ax.add_collection(collection)
fig, axs = plt.subplots(2, sharex=True, sharey=True)
for ax in axs:
ax.plot(t, s, color='black')
ax.axhline(0, color='black')

collection = collections.BrokenBarHCollection.span_where(
t, ymin=-1, ymax=0, where=s1 < 0, facecolor='red', alpha=0.5)
ax.add_collection(collection)
axs[0].set_title('using fill_between')
axs[0].fill_between(t, 1, where=s > 0, facecolor='green', alpha=.5)
axs[0].fill_between(t, -1, where=s < 0, facecolor='red', alpha=.5)

axs[1].set_title('using span_where')
axs[1].add_collection(collections.BrokenBarHCollection.span_where(
t, ymin=0, ymax=1, where=s > 0, facecolor='green', alpha=0.5))
axs[1].add_collection(collections.BrokenBarHCollection.span_where(
t, ymin=-1, ymax=0, where=s < 0, facecolor='red', alpha=0.5))

plt.show()

Expand All @@ -43,7 +40,7 @@
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.axes.Axes.fill_between`
# - `matplotlib.collections.BrokenBarHCollection`
# - `matplotlib.collections.BrokenBarHCollection.span_where`
# - `matplotlib.axes.Axes.add_collection`
# - `matplotlib.axes.Axes.axhline`