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Simplifications to quiver3d. #12796

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Merged
merged 1 commit into from
Nov 12, 2018
Merged

Simplifications to quiver3d. #12796

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15 changes: 3 additions & 12 deletions lib/mpl_toolkits/mplot3d/axes3d.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2637,15 +2637,12 @@ def calc_arrow(uvw, angle=15):

# first 6 arguments are X, Y, Z, U, V, W
input_args = args[:argi]
# if any of the args are scalar, convert into list
input_args = [[k] if isinstance(k, (int, float)) else k
for k in input_args]

# extract the masks, if any
masks = [k.mask for k in input_args
if isinstance(k, np.ma.MaskedArray)]
# broadcast to match the shape
bcast = np.broadcast_arrays(*(input_args + masks))
bcast = np.broadcast_arrays(*input_args, *masks)
input_args = bcast[:argi]
masks = bcast[argi:]
if masks:
Expand All @@ -2655,21 +2652,15 @@ def calc_arrow(uvw, angle=15):
input_args = [np.ma.array(k, mask=mask).compressed()
for k in input_args]
else:
input_args = [k.flatten() for k in input_args]
input_args = [np.ravel(k) for k in input_args]

if any(len(v) == 0 for v in input_args):
# No quivers, so just make an empty collection and return early
linec = art3d.Line3DCollection([], *args[argi:], **kwargs)
self.add_collection(linec)
return linec

# Following assertions must be true before proceeding
# must all be ndarray
assert all(isinstance(k, np.ndarray) for k in input_args)
# must all in same shape
assert len({k.shape for k in input_args}) == 1

shaft_dt = np.linspace(0, length, num=2)
shaft_dt = np.array([0, length])
arrow_dt = shaft_dt * arrow_length_ratio

if pivot == 'tail':
Expand Down