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11 changes: 7 additions & 4 deletions lib/matplotlib/transforms.py
Original file line number Diff line number Diff line change
Expand Up @@ -697,10 +697,13 @@ def union(bboxes):
"""Return a `Bbox` that contains all of the given *bboxes*."""
if not len(bboxes):
raise ValueError("'bboxes' cannot be empty")
x0 = np.min([bbox.xmin for bbox in bboxes])
x1 = np.max([bbox.xmax for bbox in bboxes])
y0 = np.min([bbox.ymin for bbox in bboxes])
y1 = np.max([bbox.ymax for bbox in bboxes])
# needed for 1.14.4 < numpy_version < 1.15
# can remove once we are at numpy >= 1.15
with np.errstate(invalid='ignore'):
x0 = np.min([bbox.xmin for bbox in bboxes])
x1 = np.max([bbox.xmax for bbox in bboxes])
y0 = np.min([bbox.ymin for bbox in bboxes])
y1 = np.max([bbox.ymax for bbox in bboxes])
return Bbox([[x0, y0], [x1, y1]])

@staticmethod
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