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Make rotation matrix immutable and cache the value

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jan 2023-04-12 18:21:18 -07:00
parent 93ab0a942d
commit 234264c0af
1 changed files with 6 additions and 2 deletions
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8
masque/utils/transform.py
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@ -2,11 +2,13 @@
Geometric transforms
"""
from typing import Sequence
from functools import lru_cache
import numpy
from numpy.typing import NDArray
@lru_cache
def rotation_matrix_2d(theta: float) -> NDArray[numpy.float64]:
"""
2D rotation matrix for rotating counterclockwise around the origin.
@ -17,8 +19,10 @@ def rotation_matrix_2d(theta: float) -> NDArray[numpy.float64]:
Returns:
rotation matrix
"""
return numpy.array([[numpy.cos(theta), -numpy.sin(theta)],
[numpy.sin(theta), +numpy.cos(theta)]])
arr = numpy.array([[numpy.cos(theta), -numpy.sin(theta)],
[numpy.sin(theta), +numpy.cos(theta)]])
arr.flags.writeable = False
return arr
def normalize_mirror(mirrored: Sequence[bool]) -> tuple[bool, float]: