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Don't call np.identity() in transforms. #10327

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Merged
merged 1 commit into from
Jan 29, 2018
Merged

Don't call np.identity() in transforms. #10327

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8 changes: 5 additions & 3 deletions lib/matplotlib/transforms.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1928,7 +1928,8 @@ def __init__(self, matrix=None, **kwargs):
"""
Affine2DBase.__init__(self, **kwargs)
if matrix is None:
matrix = np.identity(3)
# A bit faster than np.identity(3).
matrix = IdentityTransform._mtx.copy()
self._mtx = matrix
self._invalid = 0

Expand Down Expand Up @@ -1999,13 +2000,14 @@ def identity():
Unless this transform will be mutated later on, consider using
the faster :class:`IdentityTransform` class instead.
"""
return Affine2D(np.identity(3))
return Affine2D()

def clear(self):
"""
Reset the underlying matrix to the identity transform.
"""
self._mtx = np.identity(3)
# A bit faster than np.identity(3).
self._mtx = IdentityTransform._mtx.copy()
self.invalidate()
return self

Expand Down