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Backport PR #31706 on branch v3.11.x (Fix clabel manual index) #31873

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Merged
QuLogic merged 1 commit into from
Jun 10, 2026
+9 −2
Merged

Backport PR #31706 on branch v3.11.x (Fix clabel manual index) #31873

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4 changes: 2 additions & 2 deletions lib/matplotlib/contour.py
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Original file line number Diff line number Diff line change
Expand Up @@ -478,8 +478,8 @@ def add_label_near(self, x, y, inline=True, inline_spacing=5,
label_width = self._get_nth_label_width(level)
rotation, path = self._split_path_and_get_label_rotation(
path, idx_vtx_min, proj, label_width, inline_spacing)
self.add_label(*proj, rotation, self.labelLevelList[idx_level_min],
self.labelCValueList[idx_level_min])
self.add_label(*proj, rotation, self.labelLevelList[level],
self.labelCValueList[level])

if inline:
self._paths[idx_level_min] = path
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7 changes: 7 additions & 0 deletions lib/matplotlib/tests/test_contour.py
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Original file line number Diff line number Diff line change
Expand Up @@ -891,3 +891,10 @@ def test_contour_aliases(fig_test, fig_ref):
def test_contour_singular_color():
with pytest.raises(TypeError):
plt.figure().add_subplot().contour([[0, 1], [2, 3]], color="r")


def test_clabel_manual_subset():
fig, ax = plt.subplots()
cs = ax.contour([[1, 2], [3, 4]], levels=[1.5, 2.5, 3.5])
# Attempt to label only one specific level manually
ax.clabel(cs, levels=[2.5], manual=[(0.5, 0.5)])
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