The game of Pong was one of the first computer video games and was all the rage

Question

The game of Pong was one of the first computer video games and was all the rage in the 1970’s. The game consists of a ball that moves horizontally and vertically within a rectangular region, and a single paddle, located at the right edge of the region, that can be moved up and down by the user. When the ball hits the top, left, or bottom wall or paddle, it bounces off in the opposite direction. If the ball misses the paddle, it passes though the right wall and re-emerges at the left wall. Write a Java FX GUI application that plays pong. Set the title to Pong!!, and center the stage on the screen. Place all classes into one file. Use threads as needed. Do not use any images. Output should be user friendly. with comments

Explanation / Answer

package

svanimpe.pong.ui;

package

svanimpe.pong.ui;

import javafx.application.Application; import javafx.beans.InvalidationListener; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.paint.Color; import javafx.scene.text.Font; import javafx.scene.transform.Scale; import javafx.scene.transform.Transform; import javafx.stage.Stage; import svanimpe.pong.Game; import static svanimpe.pong.Constants.*; public class Pong extends Application { @Override public void start(Stage stage) { Font.loadFont(getClass().getResource("/arcade-normal.ttf").toExternalForm(), 0); /* Font family 'Arcade Normal' in CSS. */ Game game = new Game(WINNING_SCORE); Group content = new Group(); GameScreen gameScreen = new GameScreen(game); WelcomeScreen welcomeScreen = new WelcomeScreen(); EndScreen endScreen = new EndScreen(); content.getChildren().add(welcomeScreen); /* * Screen transitions. */ welcomeScreen.setOnStart(() -> { content.getChildren().clear(); content.getChildren().add(gameScreen); gameScreen.requestFocus(); game.start(); }); game.setOnGameEnd(() -> { content.getChildren().clear(); content.getChildren().add(endScreen); endScreen.requestFocus(); endScreen.setScore(game.getPlayer().getScore()); }); endScreen.setOnRestart(() -> { content.getChildren().clear(); content.getChildren().add(gameScreen); gameScreen.requestFocus(); game.start(); }); /* * The content is wrapped in a Group so it can be scaled (the root node itself cannot be * scaled as it scales with the scene). */ Scene scene = new Scene(new Group(content), WIDTH, HEIGHT, Color.BLACK); scene.getStylesheets().add("/styles.css"); Scale scale = Transform.scale(1, 1, 0, 0); content.getTransforms().add(scale); /* * The following listener is called whenever the scene is resized to update the scale and * add letter- and pillarboxing. */ InvalidationListener updateScale = value -> { double scaleX = scene.getWidth() / WIDTH; double scaleY = scene.getHeight() / HEIGHT; if (scaleX < scaleY) { /* * Letterboxing. */ scale.setX(scaleX); scale.setY(scaleX); double remainingHeight = scene.getHeight() - HEIGHT * scaleX; content.setTranslateX(0); content.setTranslateY(remainingHeight / 2); } else if (scaleY < scaleX) { /* * Pillarboxing. */ scale.setX(scaleY); scale.setY(scaleY); double remainingWidth = scene.getWidth() - WIDTH * scaleY; content.setTranslateX(remainingWidth / 2); content.setTranslateY(0); } else { /* * Regular scaling. */ scale.setX(scaleX); scale.setY(scaleY); content.setTranslateX(0); content.setTranslateY(0); } }; scene.widthProperty().addListener(updateScale); scene.heightProperty().addListener(updateScale); stage.setScene(scene); stage.setTitle("Pong"); stage.show(); welcomeScreen.requestFocus(); /* This step is necessary to receive keyboard input. */ } public static void main(String... args) { Application.launch(Pong.class, args); } }

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