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wip: no quick transform, when there is no vertices #1380

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wip: no quick transform, when there is no vertices #1380

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6 changes: 5 additions & 1 deletion lib/cartopy/crs.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1250,7 +1250,7 @@ def quick_vertices_transform(self, vertices, src_crs):
if vertices.size == 0:
return vertices

if self == src_crs:
if self == src_crs and len(vertices) > 0:
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Because of the lines 1250-1251, which were added at #2213, I don’t think this check will ever be exercised.

x = vertices[:, 0]
y = vertices[:, 1]
# Extend the limits a tiny amount to allow for precision mistakes
Expand Down Expand Up @@ -1372,6 +1372,10 @@ def _bbox_and_offset(self, other_plate_carree):
def quick_vertices_transform(self, vertices, src_crs):
return_value = super().quick_vertices_transform(vertices, src_crs)

# if there is no vertices
if len(vertices) == 0:
return return_value

# Optimise the PlateCarree -> PlateCarree case where no
# wrapping or interpolation needs to take place.
if return_value is None and isinstance(src_crs, PlateCarree):
Expand Down