From 108448319ba044efaeb9eceb60cda611dbb629a9 Mon Sep 17 00:00:00 2001
From: Hansin Ahuja <48261100+hansinahuja@users.noreply.github.com>
Date: Fri, 10 Dec 2021 10:57:26 +0530
Subject: [PATCH] Backport PR #21773: FIX: Reset label of axis to center
---
lib/matplotlib/axes/_base.py | 32 +++++++++++++++++++------------
lib/matplotlib/tests/test_axes.py | 22 +++++++++++++++++++++
2 files changed, 42 insertions(+), 12 deletions(-)
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index 7cea32d849d0..77b81b5ac406 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -3488,15 +3488,19 @@ def set_xlabel(self, xlabel, fontdict=None, labelpad=None, *,
f"its corresponding low level keyword "
f"arguments ({protected_kw}) are also "
f"supplied")
- loc = 'center'
+
else:
loc = (loc if loc is not None
else mpl.rcParams['xaxis.labellocation'])
- _api.check_in_list(('left', 'center', 'right'), loc=loc)
- if loc == 'left':
- kwargs.update(x=0, horizontalalignment='left')
- elif loc == 'right':
- kwargs.update(x=1, horizontalalignment='right')
+ _api.check_in_list(('left', 'center', 'right'), loc=loc)
+
+ if loc == 'left':
+ kwargs.update(x=0, horizontalalignment='left')
+ elif loc == 'center':
+ kwargs.update(x=0.5, horizontalalignment='center')
+ elif loc == 'right':
+ kwargs.update(x=1, horizontalalignment='right')
+
return self.xaxis.set_label_text(xlabel, fontdict, **kwargs)
def invert_xaxis(self):
@@ -3832,15 +3836,19 @@ def set_ylabel(self, ylabel, fontdict=None, labelpad=None, *,
f"its corresponding low level keyword "
f"arguments ({protected_kw}) are also "
f"supplied")
- loc = 'center'
+
else:
loc = (loc if loc is not None
else mpl.rcParams['yaxis.labellocation'])
- _api.check_in_list(('bottom', 'center', 'top'), loc=loc)
- if loc == 'bottom':
- kwargs.update(y=0, horizontalalignment='left')
- elif loc == 'top':
- kwargs.update(y=1, horizontalalignment='right')
+ _api.check_in_list(('bottom', 'center', 'top'), loc=loc)
+
+ if loc == 'bottom':
+ kwargs.update(y=0, horizontalalignment='left')
+ elif loc == 'center':
+ kwargs.update(y=0.5, horizontalalignment='center')
+ elif loc == 'top':
+ kwargs.update(y=1, horizontalalignment='right')
+
return self.yaxis.set_label_text(ylabel, fontdict, **kwargs)
def invert_yaxis(self):
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 17f8e5c6312c..39b247863786 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -104,6 +104,28 @@ def test_label_loc_rc(fig_test, fig_ref):
cbar.set_label("Z Label", x=1, ha='right')
+def test_label_shift():
+ fig, ax = plt.subplots()
+
+ # Test label re-centering on x-axis
+ ax.set_xlabel("Test label", loc="left")
+ ax.set_xlabel("Test label", loc="center")
+ assert ax.xaxis.get_label().get_horizontalalignment() == "center"
+ ax.set_xlabel("Test label", loc="right")
+ assert ax.xaxis.get_label().get_horizontalalignment() == "right"
+ ax.set_xlabel("Test label", loc="center")
+ assert ax.xaxis.get_label().get_horizontalalignment() == "center"
+
+ # Test label re-centering on y-axis
+ ax.set_ylabel("Test label", loc="top")
+ ax.set_ylabel("Test label", loc="center")
+ assert ax.yaxis.get_label().get_horizontalalignment() == "center"
+ ax.set_ylabel("Test label", loc="bottom")
+ assert ax.yaxis.get_label().get_horizontalalignment() == "left"
+ ax.set_ylabel("Test label", loc="center")
+ assert ax.yaxis.get_label().get_horizontalalignment() == "center"
+
+
@check_figures_equal(extensions=["png"])
def test_acorr(fig_test, fig_ref):
np.random.seed(19680801)
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