JavaFX PathTransition pause and play

import javafx.animation.PathTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.shape.Arc;
import javafx.scene.shape.Circle;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Main extends Application {
   @Override//from   w w  w . j  a v  a 2s .co  m
   public void start(Stage primaryStage) {
      // Create a pane
      Pane pane = new Pane();

      // Create a arc
      Arc arc = new Arc(100, 50, 75, 25, 0, -180);
      arc.setFill(Color.WHITE);
      arc.setStroke(Color.BLACK);

      // Create a circle
      Circle circle = new Circle(100, 75, 5);

      // Place nodes in pane
      pane.getChildren().addAll(arc, circle);

      // Create a path transition
      PathTransition pt = new PathTransition();
      pt.setDuration(Duration.millis(4000));
      pt.setPath(arc);
      pt.setNode(circle);
      pt.setOrientation(
         PathTransition.OrientationType.ORTHOGONAL_TO_TANGENT);
      pt.setCycleCount(Timeline.INDEFINITE);
      pt.setAutoReverse(true);
      pt.play(); // Start animation

      // Create and register the handle
      pane.setOnMousePressed(e -> {
         pt.pause();
      });

      pane.setOnMouseReleased(e -> {
         pt.play();
      });

      // Create a scene and place it in the stage
      Scene scene = new Scene(pane, 200, 100);
      primaryStage.setTitle("java2s.com");
      primaryStage.setScene(scene);
      primaryStage.show();
   }
}