FingerTreeAnimation using reftree (https://github.com/stanch/reftree)

FingerTreeAnimation.scala

import de.sciss.fingertree.{FingerTree, Measure}
import reftree.{Diagram, Utils}
import reftree.contrib.FingerTreeInstances._

implicit val measure = Measure.Indexed

val trees = Utils.iterate(FingerTree(1), 22)(t ⇒ t :+ (t.measure + 1))

Diagram().renderAnimation("finger", tweakOptions = _.copy(
  delay = 200, loop = false, onionSkin = 0, diffAccent = true,
  verticalSpacing = 2, density = 50
))(trees)