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Faster title alignment #28300

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Merged
merged 2 commits into from
May 28, 2024
Merged

Faster title alignment #28300

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8abe308
Faster title alignment
rcomer May 25, 2024
1dfc773
Test that title is placed above an inset axes
rcomer May 28, 2024
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29 changes: 18 additions & 11 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2985,6 +2985,10 @@ def _update_title_position(self, renderer):

titles = (self.title, self._left_title, self._right_title)

if not any(title.get_text() for title in titles):
# If the titles are all empty, there is no need to update their positions.
return

# Need to check all our twins too, aligned axes, and all the children
# as well.
axs = set()
Expand All @@ -2996,21 +3000,24 @@ def _update_title_position(self, renderer):
locator = ax.get_axes_locator()
ax.apply_aspect(locator(self, renderer) if locator else None)

top = -np.inf
for ax in axs:
bb = None
xticklabel_top = any(tick.label2.get_visible() for tick in
[ax.xaxis.majorTicks[0], ax.xaxis.minorTicks[0]])
Comment on lines +3006 to +3007
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@rcomer rcomer May 27, 2024 •
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Directly check the visibility of the tick label as I think that is the most relevant part from xaxis.get_ticks_position() and will prevent the unnecessary calls to xaxis.get_tightbbox mentioned at #26150 (comment). Only checking the first tick is consistent with get_ticks_position.

There is a question in my mind about what happens if the ticks are pointing outward but unlabelled, but I think that could already be an issue with the existing approach as you could have "default" position and outward ticks. Edit: the ticks themselves aren't included in get_tightbbox so actually this makes no difference.

if (xticklabel_top or ax.xaxis.get_label_position() == 'top'):
bb = ax.xaxis.get_tightbbox(renderer)
if bb is None:
# Extent of the outline for colorbars, of the axes otherwise.
bb = ax.spines.get("outline", ax).get_window_extent()
top = max(top, bb.ymax)

for title in titles:
x, _ = title.get_position()
# need to start again in case of window resizing
title.set_position((x, 1.0))
top = -np.inf
for ax in axs:
bb = None
if (ax.xaxis.get_ticks_position() in ['top', 'unknown']
or ax.xaxis.get_label_position() == 'top'):
bb = ax.xaxis.get_tightbbox(renderer)
if bb is None:
# Extent of the outline for colorbars, of the axes otherwise.
bb = ax.spines.get("outline", ax).get_window_extent()
top = max(top, bb.ymax)
if title.get_text():
if title.get_text():
for ax in axs:
ax.yaxis.get_tightbbox(renderer) # update offsetText
if ax.yaxis.offsetText.get_text():
bb = ax.yaxis.offsetText.get_tightbbox(renderer)
Expand Down
12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -7118,6 +7118,18 @@ def test_title_no_move_off_page():
assert tt.get_position()[1] == 1.0


def test_title_inset_ax():
# Title should be above any child axes
mpl.rcParams['axes.titley'] = None
fig, ax = plt.subplots()
ax.set_title('Title')
fig.draw_without_rendering()
assert ax.title.get_position()[1] == 1
ax.inset_axes([0, 1, 1, 0.1])
fig.draw_without_rendering()
assert ax.title.get_position()[1] == 1.1


def test_offset_label_color():
# Tests issue 6440
fig, ax = plt.subplots()
Expand Down
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