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Backport PR #24026 on branch v3.6.x (Don't modify Axes property cycle in stackplot) #24029

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Merged
merged 1 commit into from
Sep 28, 2022
Merged

Backport PR #24026 on branch v3.6.x (Don't modify Axes property cycle in stackplot) #24029

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13 changes: 8 additions & 5 deletions lib/matplotlib/stackplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@
(https://stackoverflow.com/users/66549/doug)
"""

import itertools

import numpy as np

from matplotlib import _api
Expand Down Expand Up @@ -70,7 +72,9 @@ def stackplot(axes, x, *args,

labels = iter(labels)
if colors is not None:
axes.set_prop_cycle(color=colors)
colors = itertools.cycle(colors)
else:
colors = (axes._get_lines.get_next_color() for _ in y)

# Assume data passed has not been 'stacked', so stack it here.
# We'll need a float buffer for the upcoming calculations.
Expand Down Expand Up @@ -108,17 +112,16 @@ def stackplot(axes, x, *args,
stack += first_line

# Color between x = 0 and the first array.
color = axes._get_lines.get_next_color()
coll = axes.fill_between(x, first_line, stack[0, :],
facecolor=color, label=next(labels, None),
facecolor=next(colors), label=next(labels, None),
**kwargs)
coll.sticky_edges.y[:] = [0]
r = [coll]

# Color between array i-1 and array i
for i in range(len(y) - 1):
color = axes._get_lines.get_next_color()
r.append(axes.fill_between(x, stack[i, :], stack[i + 1, :],
facecolor=color, label=next(labels, None),
facecolor=next(colors),
label=next(labels, None),
**kwargs))
return r
5 changes: 3 additions & 2 deletions lib/matplotlib/tests/test_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2859,10 +2859,11 @@ def test_stackplot():
ax.set_xlim((0, 10))
ax.set_ylim((0, 70))

# Reuse testcase from above for a labeled data test
# Reuse testcase from above for a test with labeled data and with colours
# from the Axes property cycle.
data = {"x": x, "y1": y1, "y2": y2, "y3": y3}
fig, ax = plt.subplots()
ax.stackplot("x", "y1", "y2", "y3", data=data)
ax.stackplot("x", "y1", "y2", "y3", data=data, colors=["C0", "C1", "C2"])
ax.set_xlim((0, 10))
ax.set_ylim((0, 70))

Expand Down