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Fix: Vertical Misalignment of LaTeX X-tick Labels #31891

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Fix: Vertical Misalignment of LaTeX X-tick Labels #31891

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42 changes: 42 additions & 0 deletions lib/matplotlib/axis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1546,6 +1546,46 @@ def get_tick_padding(self):
values.append(self.minorTicks[0].get_tick_padding())
return max(values, default=0)

def _align_xtick_label_baselines(self, renderer):

# Shift x-axis tick label1's down so their baselines align,
# compensating for differing ascents.

if self.axis_name != 'x':
return

entries = []
for tick in self.get_major_ticks():
label = tick.label1
if not (label.get_visible() and label.get_text()):
continue
try:
_, info, _ = label._get_layout(renderer)
except Exception:
continue
if not info:
continue
ascent = info[0][1][1]
entries.append((tick, label, ascent))

if not entries:
return

max_ascent = max(a for _, _, a in entries)
fig = self.get_figure(root=True)
dpi_scale_trans = fig.dpi_scale_trans
dpi = fig.dpi

for tick, label, ascent in entries:
base_trans = tick._get_text1_transform()[0]
extra_px = max_ascent - ascent
if extra_px <= 0.5:
label.set_transform(base_trans)
continue
shift = mtransforms.ScaledTranslation(
0, -extra_px / dpi, dpi_scale_trans)
label.set_transform(label.get_transform() + shift)

@martist.allow_rasterization
def draw(self, renderer):
# docstring inherited
Expand All @@ -1557,6 +1597,8 @@ def draw(self, renderer):
ticks_to_draw = self._update_ticks()
tlb1, tlb2 = self._get_ticklabel_bboxes(ticks_to_draw, renderer)

self._align_xtick_label_baselines(renderer)

for tick in ticks_to_draw:
tick.draw(renderer)

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24 changes: 24 additions & 0 deletions lib/matplotlib/tests/test_axis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -128,3 +128,27 @@ def test_set_ticks_emits_lim_changed():
ax2.callbacks.connect("ylim_changed", called_polar.append)
ax2.set_rticks([1, 2, 3])
assert called_polar

def test_xtick_label_baselines_alignment():

fig, ax = plt.subplots(figsize=(3, 3), dpi=300)
ax.set_xlim(-0.5, 2.5)
ax.set_ylim(-3, 3)
labels = [r"$w^{(2)}_1$", r"$w^{(2)}_2$", r"$b^{(2)}$"]
ax.set_xticks([0, 1, 2], labels)
ax.set_yticks([])
ax.tick_params(which="both", length=0)
fig.tight_layout()

fig.canvas.draw()
renderer = fig.canvas.get_renderer()

baselines = []
for tick in ax.xaxis.get_major_ticks():
label = tick.label1
bbox = label.get_window_extent(renderer)
_, info, _ = label._get_layout(renderer)
descent = info[0][1][2]
baselines.append(bbox.y0 + descent)

assert max(baselines) - min(baselines) < 0.01
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