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[bezier] Make splitCubicAtTC into a generator

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This commit is contained in:
Behdad Esfahbod 2023-02-16 17:25:30 -07:00
parent fdc7714679
commit 822f7a01da
1 changed files with 4 additions and 6 deletions
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10
Lib/fontTools/misc/bezierTools.py
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@ -654,11 +654,11 @@ def splitCubicAtTC(pt1, pt2, pt3, pt4, *ts):
pt1,pt2,pt3,pt4: Control points of the Bezier as complex numbers..
*ts: Positions at which to split the curve.
Returns:
A list of curve segments (each curve segment being four complex numbers).
Yields:
Curve segments (each curve segment being four complex numbers).
"""
a, b, c, d = calcCubicParametersC(pt1, pt2, pt3, pt4)
return _splitCubicAtTC(a, b, c, d, *ts)
yield from _splitCubicAtTC(a, b, c, d, *ts)
@cython.returns(cython.complex)
@ -782,7 +782,6 @@ def _splitCubicAtTC(a, b, c, d, *ts):
ts = list(ts)
ts.insert(0, 0.0)
ts.append(1.0)
segments = []
for i in range(len(ts) - 1):
t1 = ts[i]
t2 = ts[i + 1]
@ -799,8 +798,7 @@ def _splitCubicAtTC(a, b, c, d, *ts):
c1 = (2 * b * t1 + c + 3 * a * t1_2) * delta
d1 = a * t1_3 + b * t1_2 + c * t1 + d
pt1, pt2, pt3, pt4 = calcCubicPointsC(a1, b1, c1, d1)
segments.append((pt1, pt2, pt3, pt4))
return segments
yield (pt1, pt2, pt3, pt4)
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