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Description
Bug report
Adding a FancyArrowPatch to an axis changes the result returned by get_path(). I would expect adding an artist to an axis to have no effect on its path in data co-ordinates.
Code for reproduction
import matplotlib.pyplot as plt
import matplotlib.patches as mpatch
# Create arrow patch
arrow = mpatch.FancyArrowPatch((0, 0), (0, 1))
# Print original path
print(arrow.get_path())
# Add to an axis
fig, ax = plt.subplots()
ax.add_artist(arrow)
# Print new path
print(arrow.get_path())Actual outcome
Path(array([[-0.1 , 0. ],
[-0.1 , 0.25195312],
[-0.1 , 0.50390625],
[-0.25 , 0.50390625],
[-0.125 , 0.75195312],
[ 0. , 1. ],
[ 0.125 , 0.75195312],
[ 0.25 , 0.50390625],
[ 0.1 , 0.50390625],
[ 0.1 , 0.25195312],
[ 0.1 , 0. ],
[-0.1 , 0. ],
[-0.1 , 0. ]]), array([ 1, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 2, 79], dtype=uint8))
Path(array([[ -2.01612903e-04, 5.40924072e-03],
[ -2.01612903e-04, 4.99324011e-01],
[ -2.01612903e-04, 9.93238781e-01],
[ -5.04032258e-04, 9.93238781e-01],
[ -2.52016129e-04, 9.93914224e-01],
[ 0.00000000e+00, 9.94589667e-01],
[ 2.52016129e-04, 9.93914224e-01],
[ 5.04032258e-04, 9.93238781e-01],
[ 2.01612903e-04, 9.93238781e-01],
[ 2.01612903e-04, 4.99324011e-01],
[ 2.01612903e-04, 5.40924072e-03],
[ -2.01612903e-04, 5.40924072e-03],
[ -2.01612903e-04, 5.40924072e-03]]), array([ 1, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 2, 79], dtype=uint8))
Expected outcome
Clearly the two paths are different - I expected them to be the same (and I would expect the first one to be the correct one based on the FancyArrowPatch docstring).
Matplotlib version
- Operating System: OSX
- Matplotlib Version: master branch
- Python Version: 3.6.1
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