JavaFx - CSS/JS Anime 101 - 04 Trim Line

(Inspired by)/(Copied from): https://codepen.io/MrCotter/pen/oeJeVq

import javafx.animation.Animation;
import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.ScaleTransition;
import javafx.animation.SequentialTransition;
import javafx.animation.Timeline;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyCodeCombination;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.transform.Scale;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {
 public static void main(String[] args) {
  launch(args);
 }

 public static final Interpolator EASE_IN_QUART = Interpolator.SPLINE(0.895, 0.03, 0.685, 0.22);
 public static final Interpolator EASE_OUT_QUART = Interpolator.SPLINE(0.165, 0.84, 0.44, 1);
 
 
 @Override
 public void start(Stage stage) throws Exception {

  Pane pane = new Pane();
  pane.setStyle("-fx-border-color:white;-fx-border-width:2");
  pane.setMaxSize(250, 400);
  pane.setMinSize(250, 400);
  
  Line line = new Line(40, 0, 40, 0);
  line.setTranslateY(200);
  line.setStroke(Color.WHITE);
  line.setStrokeWidth(15);

  Timeline timeline = new Timeline(
    new KeyFrame(Duration.ZERO, new KeyValue(line.startXProperty(), 40, Interpolator.DISCRETE)),
    new KeyFrame(Duration.ZERO, new KeyValue(line.endXProperty(), 40, Interpolator.DISCRETE)),
    new KeyFrame(Duration.seconds(2), new KeyValue(line.endXProperty(), 210, EASE_OUT_QUART)),
    new KeyFrame(Duration.seconds(2.5), new KeyValue(line.startXProperty(), 40, EASE_OUT_QUART)),
    new KeyFrame(Duration.seconds(4), new KeyValue(line.startXProperty(), 210, EASE_OUT_QUART))
    );
  
  timeline.setCycleCount(Animation.INDEFINITE);
  timeline.play();
  
  
  pane.getChildren().add(line);
  
  VBox root = new VBox(pane);
  root.setAlignment(Pos.CENTER);
  stage.setScene(new Scene(root, 600, 600, Color.web("#1E1E1E")));
  stage.show();
  stage.getScene().getAccelerators().put(new KeyCodeCombination(KeyCode.ESCAPE), () -> System.exit(0));
 }


}

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