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Pong Game in JavaFX using 90 lines of code



A pong game implementation using 90 lines of Java code only. It is possible to write with less lines, but it would make the code unreadable.

To run it:

* Download the source and save it to a file called Pong.java
* Using JDK 8, run: javac Pong.java  and then java Pong

 You can improve the game mainly by changing its AI - now basically the enemy follows the ball. See the code below.

import java.util.Random;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.TextAlignment;
import javafx.stage.Stage;
import javafx.util.Duration;
public class Pong extends Application {
private static final int width = 800;
private static final int height = 600;
private static final int PLAYER_HEIGHT = 100;
private static final int PLAYER_WIDTH = 15;
private static final double BALL_R = 15;
private int ballYSpeed = 1;
private int ballXSpeed = 1;
private double playerOneYPos = height / 2;
private double playerTwoYPos = height / 2;
private double ballXPos = width / 2;
private double ballYPos = height / 2;
private int scoreP1 = 0;
private int scoreP2 = 0;
private boolean gameStarted;
private int playerOneXPos = 0;
private double playerTwoXPos = width - PLAYER_WIDTH;
public void start(Stage stage) throws Exception {
Canvas canvas = new Canvas(width, height);
GraphicsContext gc = canvas.getGraphicsContext2D();
Timeline tl = new Timeline(new KeyFrame(Duration.millis(10), e -> run(gc)));
tl.setCycleCount(Timeline.INDEFINITE);
canvas.setOnMouseMoved(e -> playerOneYPos = e.getY());
canvas.setOnMouseClicked(e -> gameStarted = true);
stage.setScene(new Scene(new StackPane(canvas)));
stage.show();
tl.play();
}
private void run(GraphicsContext gc) {
gc.setFill(Color.BLACK);
gc.fillRect(0, 0, width, height);
gc.setFill(Color.WHITE);
gc.setFont(Font.font(25));
if(gameStarted) {
ballXPos+=ballXSpeed;
ballYPos+=ballYSpeed;
if(ballXPos < width - width / 4) {
playerTwoYPos = ballYPos - PLAYER_HEIGHT / 2;
} else {
playerTwoYPos = ballYPos > playerTwoYPos + PLAYER_HEIGHT / 2 ?playerTwoYPos += 1: playerTwoYPos - 1;
}
gc.fillOval(ballXPos, ballYPos, BALL_R, BALL_R);
} else {
gc.setStroke(Color.YELLOW);
gc.setTextAlign(TextAlignment.CENTER);
gc.strokeText("Click to Start", width / 2, height / 2);
ballXPos = width / 2;
ballYPos = height / 2;
ballXSpeed = new Random().nextInt(2) == 0 ? 1: -1;
ballYSpeed = new Random().nextInt(2) == 0 ? 1: -1;
}
if(ballYPos > height || ballYPos < 0) ballYSpeed *=-1;
if(ballXPos < playerOneXPos - PLAYER_WIDTH) {
scoreP2++;
gameStarted = false;
}
if(ballXPos > playerTwoXPos + PLAYER_WIDTH) {
scoreP1++;
gameStarted = false;
}
if( ((ballXPos + BALL_R > playerTwoXPos) && ballYPos >= playerTwoYPos && ballYPos <= playerTwoYPos + PLAYER_HEIGHT) ||
((ballXPos < playerOneXPos + PLAYER_WIDTH) && ballYPos >= playerOneYPos && ballYPos <= playerOneYPos + PLAYER_HEIGHT)) {
ballYSpeed += 1 * Math.signum(ballYSpeed);
ballXSpeed += 1 * Math.signum(ballXSpeed);
ballXSpeed *= -1;
ballYSpeed *= -1;
}
gc.fillText(scoreP1 + "\t\t\t\t\t\t\t\t" + scoreP2, width / 2, 100);
gc.fillRect(playerTwoXPos, playerTwoYPos, PLAYER_WIDTH, PLAYER_HEIGHT);
gc.fillRect(playerOneXPos, playerOneYPos, PLAYER_WIDTH, PLAYER_HEIGHT);
}
}
view raw Pong.java hosted with ❤ by GitHub

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