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[transform] Document DecomposedTransform

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This commit is contained in:
Behdad Esfahbod 2023-02-03 09:37:11 -07:00
parent 89aeff636c
commit bdbc53b689
1 changed files with 15 additions and 1 deletions
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16
Lib/fontTools/misc/transform.py
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@ -19,6 +19,9 @@ Offset
Scale Scale
Convenience function that returns a scaling transformation Convenience function that returns a scaling transformation
The DecomposedTransform class implements a transformation with separate
translate, rotation, scale, skew, and transformation-center components.
:Example: :Example:
>>> t = Transform(2, 0, 0, 3, 0, 0) >>> t = Transform(2, 0, 0, 3, 0, 0)
@ -54,7 +57,7 @@ from typing import NamedTuple
from dataclasses import dataclass from dataclasses import dataclass
__all__ = ["Transform", "Identity", "Offset", "Scale"] __all__ = ["Transform", "Identity", "Offset", "Scale", "DecomposedTransform"]
_EPSILON = 1e-15 _EPSILON = 1e-15
@ -402,6 +405,10 @@ def Scale(x, y=None):
@dataclass @dataclass
class DecomposedTransform: class DecomposedTransform:
"""The DecomposedTransform class implements a transformation with separate
translate, rotation, scale, skew, and transformation-center components.
"""
translateX: float = 0 translateX: float = 0
translateY: float = 0 translateY: float = 0
rotation: float = 0 # in degrees, counter-clockwise rotation: float = 0 # in degrees, counter-clockwise
@ -413,6 +420,13 @@ class DecomposedTransform:
tCenterY: float = 0 tCenterY: float = 0
def toTransform(self): def toTransform(self):
"""Return the Transform() equivalent of this transformation.
:Example:
>>> DecomposedTransform(scaleX=2, scaleY=2).toTransform()
<Transform [2 0 0 2 0 0]>
>>>
"""
t = Transform() t = Transform()
t = t.translate( t = t.translate(
self.translateX + self.tCenterX, self.translateY + self.tCenterY self.translateX + self.tCenterX, self.translateY + self.tCenterY