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Backport PR #26608 on branch v3.8.x (Removed unnecessary origin keywords) #26658

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Merged
merged 1 commit into from
Aug 31, 2023
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Backport PR #26608 on branch v3.8.x (Removed unnecessary origin keywords) #26658

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36 changes: 23 additions & 13 deletions galleries/examples/images_contours_and_fields/contourf_demo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,6 @@
import matplotlib.pyplot as plt
import numpy as np

origin = 'lower'

delta = 0.025

x = y = np.arange(-3.0, 3.01, delta)
Expand Down Expand Up @@ -41,14 +39,14 @@
# for purposes of illustration.

fig1, ax2 = plt.subplots(layout='constrained')
CS = ax2.contourf(X, Y, Z, 10, cmap=plt.cm.bone, origin=origin)
CS = ax2.contourf(X, Y, Z, 10, cmap=plt.cm.bone)

# Note that in the following, we explicitly pass in a subset of the contour
# levels used for the filled contours. Alternatively, we could pass in
# additional levels to provide extra resolution, or leave out the *levels*
# keyword argument to use all of the original levels.

CS2 = ax2.contour(CS, levels=CS.levels[::2], colors='r', origin=origin)
CS2 = ax2.contour(CS, levels=CS.levels[::2], colors='r')

ax2.set_title('Nonsense (3 masked regions)')
ax2.set_xlabel('word length anomaly')
Expand All @@ -68,20 +66,14 @@

fig2, ax2 = plt.subplots(layout='constrained')
levels = [-1.5, -1, -0.5, 0, 0.5, 1]
CS3 = ax2.contourf(X, Y, Z, levels,
colors=('r', 'g', 'b'),
origin=origin,
extend='both')
CS3 = ax2.contourf(X, Y, Z, levels, colors=('r', 'g', 'b'), extend='both')
# Our data range extends outside the range of levels; make
# data below the lowest contour level yellow, and above the
# highest level cyan:
CS3.cmap.set_under('yellow')
CS3.cmap.set_over('cyan')

CS4 = ax2.contour(X, Y, Z, levels,
colors=('k',),
linewidths=(3,),
origin=origin)
CS4 = ax2.contour(X, Y, Z, levels, colors=('k',), linewidths=(3,))
ax2.set_title('Listed colors (3 masked regions)')
ax2.clabel(CS4, fmt='%2.1f', colors='w', fontsize=14)

Expand All @@ -104,13 +96,31 @@
fig, axs = plt.subplots(2, 2, layout="constrained")

for ax, extend in zip(axs.flat, extends):
cs = ax.contourf(X, Y, Z, levels, cmap=cmap, extend=extend, origin=origin)
cs = ax.contourf(X, Y, Z, levels, cmap=cmap, extend=extend)
fig.colorbar(cs, ax=ax, shrink=0.9)
ax.set_title("extend = %s" % extend)
ax.locator_params(nbins=4)

plt.show()

# %%
# Orient contour plots using the origin keyword
# ---------------------------------------------
# This code demonstrates orienting contour plot data using the "origin" keyword

x = np.arange(1, 10)
y = x.reshape(-1, 1)
h = x * y

fig, (ax1, ax2) = plt.subplots(ncols=2)

ax1.set_title("origin='upper'")
ax2.set_title("origin='lower'")
ax1.contourf(h, levels=np.arange(5, 70, 5), extend='both', origin="upper")
ax2.contourf(h, levels=np.arange(5, 70, 5), extend='both', origin="lower")

plt.show()

# %%
#
# .. admonition:: References
Expand Down