Using NodeBox you can make images and movies from a small amount of python code. It is very fun. You can change the number literal by dragging it with command key. It is nice idea.
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from math import sin, cos
SIZE = 431
size(SIZE, SIZE)
x = 19
y = 324
th = 1
dth = 0.5
ddth = 0.1
s = 30
colormode(RGB, 1)
stroke(color(0.5, 1, 0.5, 0.3))
strokewidth(2)
fill(color(0.5, 1, 0.5, 0.7))
beginpath()
moveto(x, y)
for i in range(313):
x += sin(th) * s
y += cos(th) * s
th += dth
dth += ddth
lineto(x, y)
print x, y
endpath()