JavaFX Line bind property to its container

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.Rectangle;
import javafx.scene.shape.Shape;
import javafx.stage.Stage;

import java.util.ArrayList;

public class Main extends Application {

    @Override/* ww  w.j  a  v a2s .  c  om*/
    public void start(Stage primaryStage) {

        Pane pane = new Pane();

        ArrayList<Shape> shapes = new ArrayList<>();

        Rectangle rec1 = new Rectangle(0,0, Color.TRANSPARENT);
        rec1.setStroke(Color.BLACK);
        rec1.xProperty().bind(pane.widthProperty().divide(4).subtract(25));
        rec1.yProperty().bind(pane.heightProperty().divide(4).add(25));
        rec1.widthProperty().bind(pane.widthProperty().divide(2));
        rec1.heightProperty().bind(pane.widthProperty().divide(2));
        shapes.add(rec1);

        Rectangle rec2 = new Rectangle(0,0, Color.TRANSPARENT);
        rec2.setStroke(Color.BLACK);
        rec2.xProperty().bind(pane.widthProperty().divide(4).add(25));
        rec2.yProperty().bind(pane.heightProperty().divide(4).subtract(25));
        rec2.widthProperty().bind(pane.widthProperty().divide(2));
        rec2.heightProperty().bind(pane.widthProperty().divide(2));
        shapes.add(rec2);

        Line line1 = new Line();
        line1.startXProperty().bind(rec1.xProperty());
        line1.startYProperty().bind(rec1.yProperty());
        line1.endXProperty().bind(rec2.xProperty());
        line1.endYProperty().bind(rec2.yProperty());
        shapes.add(line1);

        Line line2 = new Line();
        line2.startXProperty().bind(rec1.xProperty());
        line2.startYProperty().bind(rec1.yProperty().add(rec1.heightProperty()));
        line2.endXProperty().bind(rec2.xProperty());
        line2.endYProperty().bind(rec2.yProperty().add(rec1.heightProperty()));
        shapes.add(line2);

        Line line3 = new Line();
        line3.startXProperty().bind(rec1.xProperty().add(rec1.widthProperty()));
        line3.startYProperty().bind(rec1.yProperty().add(rec1.heightProperty()));
        line3.endXProperty().bind(rec2.xProperty().add(rec1.widthProperty()));
        line3.endYProperty().bind(rec2.yProperty().add(rec1.heightProperty()));
        shapes.add(line3);

        Line line4 = new Line();
        line4.startXProperty().bind(rec1.xProperty().add(rec1.widthProperty()));
        line4.startYProperty().bind(rec1.yProperty());
        line4.endXProperty().bind(rec2.xProperty().add(rec1.widthProperty()));
        line4.endYProperty().bind(rec2.yProperty());
        shapes.add(line4);


        pane.getChildren().addAll(shapes);
        Scene scene = new Scene(pane, 400, 400);
        scene.xProperty().add(scene.yProperty());
        primaryStage.setTitle("Welcome to Java");
        primaryStage.setScene(scene);
        primaryStage.show();

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

    }
}