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[misc.bezierTools] Slightly improve previous commit

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Part of https://github.com/fonttools/fonttools/issues/1142
This commit is contained in:
Behdad Esfahbod 2018-01-08 13:43:45 +00:00
parent 5dd888da1d
commit f7312fc9d0
1 changed files with 2 additions and 2 deletions
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4
Lib/fontTools/misc/bezierTools.py
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@ -60,7 +60,7 @@ def calcQuadraticArcLength(pt1, pt2, pt3):
>>> calcQuadraticArcLength((0, 0), (50, -10), (80, 50))
102.53273816445825
>>> calcQuadraticArcLength((0, 0), (40, 0), (-40, 0)) # collinear points, control point outside
66.66666666666666
66.66666666666667
>>> calcQuadraticArcLength((0, 0), (40, 0), (0, 0)) # collinear points, looping back
40.0
"""
@ -85,7 +85,7 @@ def calcQuadraticArcLengthC(pt1, pt2, pt3):
if _dot(d0,d1) >= 0:
return abs(pt3-pt1)
a, b = abs(d0), abs(d1)
return a + b - 2 * (a*b) / (a+b)
return (a*a + b*b) / (a+b)
x0 = _dot(d,d0) / origDist
x1 = _dot(d,d1) / origDist
Len = abs(2 * (_intSecAtan(x1) - _intSecAtan(x0)) * origDist / (scale * (x1 - x0)))