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MNT: Minor cleanup of label formatting in PathCollection.legend_elements by timhoffm · Pull Request #31412 · matplotlib/matplotlib · GitHub

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MNT: Minor cleanup of label formatting in PathCollection.legend_elements #31412

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Merged
QuLogic merged 1 commit into from
Mar 30, 2026
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MNT: Minor cleanup of label formatting in PathCollection.legend_elements #31412

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15 changes: 10 additions & 5 deletions lib/matplotlib/collections.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1271,7 +1271,15 @@ def legend_elements(self, prop="colors", num="auto",
"alpha": self.get_alpha(),
**kwargs}

for val, lab in zip(values, label_values):
# Pre-format all labels
# TODO: check whether we can switch to
# formatted_labels = fmt.format_ticks(label_values)
# There are subtle differences for some formatters as that passes the
# indices to __call__ as well.
fmt.set_locs(label_values)
formatted_labels = [fmt(lab) for lab in label_values]

for val, formatted in zip(values, formatted_labels):
if prop == "colors":
color = self.cmap(self.norm(val))
elif prop == "sizes":
Expand All @@ -1281,10 +1289,7 @@ def legend_elements(self, prop="colors", num="auto",
h = mlines.Line2D([0], [0], ls="", color=color, ms=size,
marker=self.get_paths()[0], **kw)
handles.append(h)
if hasattr(fmt, "set_locs"):
fmt.set_locs(label_values)
l = fmt(lab)
labels.append(l)
labels.append(formatted)

return handles, labels

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