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Fix relim() ignoring scatter PathCollection offsets #31128

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Merged
ksunden merged 3 commits into from
Mar 6, 2026
+33 −0
Merged

Fix relim() ignoring scatter PathCollection offsets #31128

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529d37c
Fix relim() to update limits for scatter PathCollection and add regre…
Archiljain Feb 10, 2026
defd13e
Refactor: use _update_collection_limits for scatter handling in relim
Archiljain Feb 10, 2026
fbb623e
Fix ruff E302: add missing blank line before test
Archiljain Feb 10, 2026
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9 changes: 9 additions & 0 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@
import matplotlib.text as mtext
import matplotlib.ticker as mticker
import matplotlib.transforms as mtransforms
import matplotlib.collections as mcollections

_log = logging.getLogger(__name__)

Expand Down Expand Up @@ -2415,6 +2416,12 @@ def _update_image_limits(self, image):
xmin, xmax, ymin, ymax = image.get_extent()
self.axes.update_datalim(((xmin, ymin), (xmax, ymax)))

def _update_collection_limits(self, collection):
offsets = collection.get_offsets()
if offsets is not None and len(offsets):
self.update_datalim(offsets)


def add_line(self, line):
"""
Add a `.Line2D` to the Axes; return the line.
Expand Down Expand Up @@ -2605,6 +2612,8 @@ def relim(self, visible_only=False):
self._update_patch_limits(artist)
elif isinstance(artist, mimage.AxesImage):
self._update_image_limits(artist)
elif isinstance(artist, mcollections.Collection):
self._update_collection_limits(artist)

def update_datalim(self, xys, updatex=True, updatey=True):
"""
Expand Down
24 changes: 24 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10159,3 +10159,27 @@ def test_animated_artists_not_drawn_by_default():

mocked_im_draw.assert_not_called()
mocked_ln_draw.assert_not_called()


def test_relim_updates_scatter_offsets():
import numpy as np
import matplotlib.pyplot as plt

fig, ax = plt.subplots()

xs = np.linspace(0, 10, 100)
ys = np.sin(xs)
scatter = ax.scatter(xs, ys)

# Shift scatter upward
new_ys = np.sin(xs) + 5
scatter.set_offsets(np.column_stack((xs, new_ys)))

ax.relim()
ax.autoscale_view()

ymin, ymax = ax.get_ylim()

# New limits should reflect shifted data
assert ymin > 3
assert ymax > 5
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