饿了，吃点豆子吧

class ShapeApp : App(ArcView::class) {
    override fun stop() {
        super.stop()
        exitProcess(0)
    }
}

class ArcView : View("我要吃豆子") {
    lateinit var arcc: Arc
    lateinit var cle: Circle
    override val root = vbox(10) {
        group {
            cle = circle(200, 10, 10) { fill = Color.GREEN }
            arcc = arc(10, 10, 50, 50, 10, 340) {
                type = ArcType.ROUND
                fill = Color.RED
            }
            circle(20, 35, 10)
            circle(20, -15, 10)
        }
        setPrefSize(400.0, 200.0)
//        alignment = Pos.CENTER
    }

    init {
        runAsync {
            while (true) {
                arcc.startAngle = 0.0
                arcc.length = 360.0
                cle.centerX = 200.0
                repeat(8) {
                    arcc.startAngle += 5
                    arcc.length -= 5 * 2
                    Thread.sleep(100)
                }
                repeat(8) {
                    cle.centerX -= 20
                    Thread.sleep(100)
                }
                repeat(8) {
                    arcc.startAngle -= 5
                    arcc.length += 5 * 2
                    Thread.sleep(100)
                }
            }
        }
    }
}