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ENH: Add parameter to set line width of legend frame (closes #30095) #30103

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ENH: Add parameter to set line width of legend frame (closes #30095) #30103

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6 changes: 5 additions & 1 deletion lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -211,7 +211,7 @@ def get_legend_handles_labels(self, legend_handler_map=None):
return handles, labels

@_docstring.interpd
def legend(self, *args, **kwargs):
def legend(self, *args, framelinewidth=None, **kwargs):
"""
Place a legend on the Axes.

Expand Down Expand Up @@ -330,6 +330,10 @@ def legend(self, *args, **kwargs):
"""
handles, labels, kwargs = mlegend._parse_legend_args([self], *args, **kwargs)
self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)

if framelinewidth is not None:
self.legend_.get_frame().set_linewidth(framelinewidth)

self.legend_._remove_method = self._remove_legend
return self.legend_

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6 changes: 6 additions & 0 deletions lib/matplotlib/tests/test_legend.py
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Expand Up @@ -107,6 +107,12 @@
assert_allclose(leg_bboxes[1].bounds, leg_bboxes[0].bounds)
assert_allclose(leg_bboxes[2].bounds, leg_bboxes[0].bounds)

def test_legend_framelinewidth():

Check failure on line 110 in lib/matplotlib/tests/test_legend.py

View workflow job for this annotation

GitHub Actions / ruff 

[rdjson] reported by reviewdog 🐶
Expected 2 blank lines, found 1

Raw Output:
message:"Expected 2 blank lines, found 1" location:{path:"/home/runner/work/matplotlib/matplotlib/lib/matplotlib/tests/test_legend.py" range:{start:{line:110 column:1} end:{line:110 column:4}}} source:{name:"ruff" url:"https://docs.astral.sh/ruff"} code:{value:"E302" url:"https://docs.astral.sh/ruff/rules/blank-lines-top-level"} suggestions:{range:{start:{line:109 column:1} end:{line:110 column:1}} text:"\n\n"}
fig, ax = plt.subplots()
ax.plot([0, 1], [0, 1], label="test")
leg = ax.legend(frameon=True, framelinewidth=5.0)
assert leg.get_frame().get_linewidth() == 5.0


def test_legend_auto5():
"""
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