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added clipping to work around floating point error in Arc._parameterize()

pull/55/head
Andy 2018-07-24 14:57:54 -07:00
parent be946b8d92
commit b47345da91
1 changed files with 6 additions and 5 deletions
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11
svgpathtools/path.py
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@ -1356,17 +1356,18 @@ class Arc(object):
u1 = (x1p - cp.real)/rx + 1j*(y1p - cp.imag)/ry # transformed start
u2 = (-x1p - cp.real)/rx + 1j*(-y1p - cp.imag)/ry # transformed end
# clip in case of floating point error
u1 = np.clip(u1.real, -1, 1) + 1j*np.clip(u1.imag, -1, 1)
u2 = np.clip(u2.real, -1, 1) + 1j * np.clip(u2.imag, -1, 1)
# Now compute theta and delta (we'll define them as we go)
# 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_rounded))
self.theta = degrees(acos(u1.real))
elif u1.imag < 0:
self.theta = -degrees(acos(u1_real_rounded))
self.theta = -degrees(acos(u1.real))
else:
if u1.real > 0: # start is on pos u_x axis
self.theta = 0