import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

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

   @Override
   public void start(Stage stage) throws Exception {
      VBox root = new VBox(10);
      root.setAlignment(Pos.CENTER);
      Button button1 = new Button("Класс AnimationTimer");
      
      root.getChildren().addAll(button1);
      Scene scene = new Scene(root, 400, 300);
      
      button1.setOnAction(event -> {
         newWindow();
      });
     
      stage.setTitle("AnimationTimer");
      stage.setScene(scene);
      stage.show();
   }
   
   public void newWindow() {
      Stage window = new Stage();
      Pane pane = new Pane();
      
      Rectangle rect = new Rectangle(50.0, 50.0);
      rect.setFill(Color.RED);
      rect.relocate(50.0, 50.0);
      
      long[] start = {System.nanoTime()};
      
      AnimationTimer timer = new AnimationTimer() {
         @Override
         public void handle(long now) {
            long t = (now - start[0]) / 1000000;
            if (t > 40) {
               System.out.println("Кадр " + now + " - " + t);
               
               start[0] = now;
            }
            else {
                System.out.println(t);
                System.out.printf("%.3f\n", now / 1000000000.0);
            }
            if (rect.getTranslateX() > 300.0) {
               rect.setTranslateX(0.0);
            }
            else {
               rect.setTranslateX(rect.getTranslateX() + 1.0);
            }
         }
      };
      timer.start();

      pane.getChildren().addAll(rect);
      Scene scene = new Scene(pane, 500, 300);
      window.setScene(scene);
      window.setTitle("AnimationTimer");
      window.show();
      window.setOnCloseRequest(event -> {
         if (timer != null) timer.stop();
      });
      scene.setOnMouseClicked(event -> {
         timer.stop();
      });
   }
}