I'm learning Java, and I found a brick breaker game project that I decided to try. I typed out everything exactly as the tutorial said, and there's only one error preventing the game from working. I'll show the code but the particular line causing issue is "GamePlay gamePlay = new GamePlay();" on line 234
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class MapGenerator {
public int map[][];
public int brickWidth;
public int brickHeight;
//makes brick size 3x7
public MapGenerator(int row, int col) {
map = new int [row][col];
for (int i = 0; i < map.length; i++){
for (int j=0; j< map [0].length;j++) {
map[i][j] = 1;
}
}
brickWidth = 540/col;
brickHeight = 150/row;
}
//this will draw the bricks
public void draw(Graphics2D g) {
for (int i = 0; i < map.length; i ++) {
for(int j = 0; j<map[0].length;j++) {
if(map[i][j]>0){
g.setColor(new Color(0XFF8787)); //brick color
g.fillRect(j*brickWidth + 80, i*brickHeight + 50, brickWidth, brickHeight);
g.setStroke(new BasicStroke(4));
g.setColor(Color.BLACK);
g.drawRect(j*brickWidth + 80, i*brickHeight + 50, brickWidth, brickHeight);
}
}
}
}
// this sets value of the bricks to 0 if hit by the ball
public void setBrickValue(int value, int row, int col) {
map[row][col] = value;
}
class GamePlay extends JPanel implements KeyListener, ActionListener {
private boolean play = true;
private int score = 0;
private int totalBricks = 21;
private Timer timer;
private int delay = 8;
private int playerX = 310;
private int ballposX = 120;
private int ballposY = 350;
private int ballXdir = -1;
private int ballYdir = -2;
private MapGenerator map;
public GamePlay(){
map = new MapGenerator(3,7);
addKeyListener(this);
setFocusable(true);
setFocusTraversalKeysEnabled(false);
timer = new Timer(delay, this);
timer.start();
}
public void paint(Graphics g){
//background color
g.setColor(Color.YELLOW);
g.fillRect(1,1,692,592);
map.draw((Graphics2D)g);
g.fillRect(0, 0, 3, 592);
g.fillRect(0, 0, 692, 3);
g.fillRect(691,0,3,592);
g.setColor(Color.blue);
g.fillRect(playerX, 550, 100, 12);
g.setColor(Color.RED); //Ball Color
g.fillOval(ballposX, ballposY, 20,20);
g.setColor(Color.black);
g.setFont(new Font("MV Boli", Font.BOLD, 25));
g.drawString("score: " + score, 520, 30);
if (totalBricks <= 0){// if all bricks are destroyed you win
play = false;
ballXdir = 0;
ballYdir = 0;
g.setColor(new Color(0XFF6464));
g.setFont(new Font("MV Boli", Font.BOLD, 30));
g.drawString("You Won! Score: "+ score, 190, 300);
g.setFont(new Font("MV Boli", Font.BOLD, 20));
g.drawString("Press Enter to Restart.", 230, 350);
}
if(ballposY > 570){ //if ball goes below paddle, you lose
play = false;
ballXdir = 0;
ballYdir = 0;
g.setColor(Color.BLACK);
g.setFont(new Font("MV Boli", Font.BOLD, 30));
g.drawString("Press Enter to Restart.", 230, 350);
}
g.dispose();
}
@Override
public void actionPerformed(ActionEvent arg0){
timer.start();
if(play){
//Ball - Pedal interaction
if(new Rectangle(ballposX, ballposY, 20, 20).intersects(new Rectangle(playerX, 550, 100, 8))){
ballYdir = - ballYdir;
}
for(int i = 0; i<map.map.length; i++ ){ //Ball - Brick interaction
for(int j = 0; j<map.map[0].length; j++){ // map.map[0].length is the number of colums
if(map.map[i][j] > 0) {
int brickX = j * map.brickWidth + 80;
int brickY = i * map.brickHeight + 50;
int brickWidth = map.brickWidth;
int brickHeight = map.brickHeight;
Rectangle rect = new Rectangle(brickX, brickY, brickWidth, brickHeight);
Rectangle ballRect = new Rectangle(ballposX, ballposY, 20,20);
Rectangle brickRect = rect;
if(ballRect.intersects(brickRect) ){
map.setBrickValue(0, i, j);
totalBricks--;
score +=5;
if(ballposX + 19 <= brickRect.x || ballposX + 1 >= brickRect.x + brickRect.width)
ballXdir = -ballXdir;
else{
ballYdir = -ballYdir;
}
}
}
}
}
ballposX += ballXdir;
ballposY += ballYdir;
if(ballposX < 0){ // if ball hits left wall it bounces back
ballXdir = -ballXdir;
}
if(ballposY <0 ){ // if ball hits top wall it bounces back
ballYdir = -ballYdir;
}
if(ballposX > 670){ //if ball hits right wall it bounces back
ballXdir = -ballXdir;
}
}
repaint();
}
@Override
public void keyTyped(KeyEvent arg0){
}
@Override
public void keyPressed(KeyEvent arg0){
if(arg0.getKeyCode() == KeyEvent.VK_RIGHT){ //if right arrow key is pressed then paddle moves right
if(playerX >= 600){
playerX = 600;
} else{
moveRight();
}
}
if(arg0.getKeyCode()==KeyEvent.VK_LEFT){
if(playerX < 10){
playerX = 10;
} else {
moveLeft();
}
}
if(arg0.getKeyCode() == KeyEvent.VK_ENTER){ //if enter key is pressed then game restarts
if(!play){
play = true;
ballposX = 120;
ballposY = 350;
ballXdir = -1;
ballYdir = -2;
score = 0;
totalBricks = 21;
map = new MapGenerator(3,7);
repaint();
}
}
}
public void moveRight(){ //paddle moves right by 50 pixels
play = true;
playerX += 50;
}
public void moveLeft(){ //paddle moves left by 50 pixels
play = true;
playerX -= 50;
}
@Override
public void keyReleased(KeyEvent arg0){
}
}
class Main{
public static void main(String[] args){
JFrame obj = new JFrame();
GamePlay gamePlay = new GamePlay();
obj.setBounds(10,10,700,600);
obj.setTitle("Brick Breaker");
obj.setResizable(false);
obj.setVisible(true);
obj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
obj.add(gamePlay);
}
}
}
I tried going back into the code to see if I missed anything, but as I am very new to Java, nothing really stood out to me. Googling and reading forums didn't yield any solutions either, as they didn't cover MapGenerator.
