如何为窗格创建形状对象？

Question

My project is creating a simple 2D ping pong game. I am using the Pane class, however I find it tedious to having to add the shape objects which I create to root.getChildren().add() method everytime. I am trying to create a function to do this but I do not know how I would call the method to add all the objects created to root.getChildren().add()

Code:

 package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import javafx.stage.Stage;
import javafx.scene.Group;
import javafx.scene.canvas.*;

public class Main extends Application {

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        int SCREEN_WIDTH = 600;
        int SCREEN_HEIGHT = 600;

        //Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        Group root = new Group();
        Scene scene = new Scene(root, SCREEN_WIDTH, SCREEN_HEIGHT, Color.BLACK);

        Pane canvas = new Pane();
        canvas.setStyle("-fx-background-color: black;");
        canvas.setPrefSize(SCREEN_WIDTH,SCREEN_HEIGHT);
        //Rectangle rect1 = new Rectangle(200,50,Color.BLUE);

        root.getChildren().add(**drawShapes()**); // trying to call method


        primaryStage.setTitle("Hello World");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public void drawShapes() { // function I am trying to implement
        Rectangle rect1 = new Rectangle(200,50,Color.BLUE);
    }

}

Eg I am wanting to create a rectangle object and add it to the pane using the function to be displayed.

Any help is appreciated.

Answer 1

You need to return your Rectagle , like

    public void drawShapes() { // function I am trying to implement
        return new Rectangle(200,50,Color.BLUE);
    }

Or you can delegate the whole thing:

public void drawShapes(Group root) { // function I am trying to implement
    root.getChildren().add(new Rectangle(200,50,Color.BLUE));
}

but then you will need to change the way you use drawShapes by replacing

root.getChildren().add(**drawShapes()**);

with

drawShapes(root);