GroovyFXでルパン風タイトル表示

lupinfx.groovy

import groovyx.javafx.*
import javafx.scene.text.Font
import javafx.scene.media.*

def sound1 = new AudioClip("ルパン風タイプ音.aif")
def sound2 = new AudioClip("ルパン風BGM音.aif")

String message = "プログラミングGROOVY"
int len = message.size()

GroovyFX.start({
    def sgb = new SceneGraphBuilder()
    def stage = sgb.stage {
        scene(fill: black, width: 1024, height: 768) {
            borderPane {
                center {
                    txt = text(text:' ', fill: white, font: new Font(600)) {
                        transition = scaleTransition(300.ms, from: 5.0, to: 1.6/len)
                    }
                }
            }
        }
    }
    def tlb = new TimelineBuilder()
    def timeline = tlb.timeline(
        onFinished: {
            txt.text = message
            transition.play()
            sound2.play()
        }
    ) {
        message.eachWithIndex { ch, i ->
            if (ch != ' ') {
                at ((i*300).ms, onFinished: {sound1.play()}) {
                    change (txt, 'text') { to ch }
                }
            }
        }
        at ((len*300).ms) { change (txt, 'text') { to ' ' } }
    }
    stage.show()
    timeline.play()
})