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# contributed by Gert-Ludwig Ingold
from pyx import *
n = 3 # number of masses
r = 3.0 # system radius
rcyc = 0.3 # radius of cycloid
nl = 13 # number of loops
rc = 0.5 # radius of masses
eps = 0.03 # extra spacing for surrounding circles
c = canvas.canvas()
springcircle = path.circle(0, 0, r)
masspositions = [i*springcircle.arclen()/n
for i in range(n)]
for springsegment in springcircle.split(masspositions):
c.stroke(springsegment,
[deformer.cycloid(rcyc, nl),
deformer.smoothed(radius=0.1)])
for x, y in springcircle.at(masspositions):
c.fill(path.circle(x, y, rc))
c.stroke(springcircle, [deformer.parallel(rc+eps)])
c.stroke(springcircle, [deformer.parallel(-rc-eps)])
c.writeEPSfile("springs")
c.writePDFfile("springs")
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