一种左右对称的螺线

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vertices = 

t = from (-*PI) to (*PI)

a =

k = rand2(0.2, )

x = a*(t*cos(t) + k*t)

y = a*t*sin(t)

K = 0.2

K = 0.5

K = 1.0

K = 1.2

K = 1.5

K = 5