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Arc: Handle round-off issue with acos() 

math.acos raises outside of valid range [-1, 1]. Handle round-off errors
gracefully by using `round()` here too.
pull/31/head
Anders Granskogen Bjørnstad 2017-11-10 13:44:24 +01:00
parent 316dc8bfe9
commit ec63d0c312
1 changed files with 5 additions and 2 deletions
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svgpathtools/path.py
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@ -1300,10 +1300,13 @@ class Arc(object):
# delta is the angular distance of the arc (w.r.t the circle)
# theta is the angle between the positive x'-axis and the start point
# on the circle
u1_real_rounded = u1.real
if u1.real > 1 or u1.real < -1:
u1_real_rounded = round(u1.real)
if u1.imag > 0:
self.theta = degrees(acos(u1.real))
self.theta = degrees(acos(u1_real_rounded))
elif u1.imag < 0:
self.theta = -degrees(acos(u1.real))
self.theta = -degrees(acos(u1_real_rounded))
else:
if u1.real > 0: # start is on pos u_x axis
self.theta = 0