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Optimise `Axes.add_patch` to avoid python iteration over bezier segments by tpgillam · Pull Request #28657 · matplotlib/matplotlib · GitHub

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Optimise Axes.add_patch to avoid python iteration over bezier segments #28657

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Optimise Axes.add_patch to avoid python iteration over bezier segments #28657

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df862f4
Use optimised form to update datalim given a path
tpgillam Aug 3, 2024
82afdeb
Remove extraneous blank line
tpgillam Aug 3, 2024
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19 changes: 4 additions & 15 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2429,18 +2429,6 @@ def _update_patch_limits(self, patch):
if (isinstance(patch, mpatches.Rectangle) and
((not patch.get_width()) and (not patch.get_height()))):
return
p = patch.get_path()
# Get all vertices on the path
# Loop through each segment to get extrema for Bezier curve sections
vertices = []
for curve, code in p.iter_bezier(simplify=False):
# Get distance along the curve of any extrema
_, dzeros = curve.axis_aligned_extrema()
# Calculate vertices of start, end and any extrema in between
vertices.append(curve([0, *dzeros, 1]))

if len(vertices):
vertices = np.vstack(vertices)

patch_trf = patch.get_transform()
updatex, updatey = patch_trf.contains_branch_seperately(self.transData)
Expand All @@ -2452,9 +2440,10 @@ def _update_patch_limits(self, patch):
updatex = False
if updatey and patch_trf == self.get_xaxis_transform():
updatey = False
trf_to_data = patch_trf - self.transData
xys = trf_to_data.transform(vertices)
self.update_datalim(xys, updatex=updatex, updatey=updatey)
self.dataLim.update_from_path(patch.get_path(),
self.ignore_existing_data_limits,
updatex=updatex, updatey=updatey)
self.ignore_existing_data_limits = False

def add_table(self, tab):
"""
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