monyumonyu.pave.js

c = transform(
	subdiv(arc([50, 50], 20, 0, 720), 6),
	mat2d.rotation(time * 120, [50, 50])
)

w = spawn(c, (s, i) => {
	t = sinwave(i / segmentCount(c) * 3 - time)
	dir = i % 2 === 0 ? 1 : -1

	p0 = Segment.point(s, 0)
	p1 = Segment.point(s, 1)

	n0 = Segment.normal(s, 0)
	n1 = Segment.normal(s, 1)

	angle = vec2.angle(
		vec2.rotate90(n0),
		vec2.rotate90(n1, false)
	) + (dir > 0 ? 360 : 0)

	amp = (dir > 0 ? -10 : 10) * t
	q0 = vec2.scaleAndAdd(p0, n0, amp)
	q1 = vec2.scaleAndAdd(p1, n1, amp)

	return join([
		line(p0, q0),
		arcByPointsAngle(q0, q1, angle),
		line(q1, p1),
	])
})

stroke(w, '', 3)