APCS: AP Computer Science A @sfhs

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====== 2048 GUI ======

The AP Classroom 2048 is Text based, so here is an example of a GUI that you can use with your 2048 Lab solution.  

===== Additional Methods For the Game2048 class =====
''public int getScore()'' returns the score.  
''public int[][] getBoard()'' returns the gameBoard.
''public int max()'' returns the maximum element of the gameBoard.    

===== Implementing Scoring =====

For the score to function the usual way, you need to modify each of the four ''merge'' methods in the ''Game2048'' class. Whenever two cells combine, add this number to the score.  For example, if two 8's are combined, 16 should be added to the score.

===== A GUI Example =====

Here is an example that implements the ''KeyListener'' class so the user can simply use the arrow keys to make a move.  


Modify the ''paintComponent'' method to change the fonts, colors, size, and appearance of the game.

<code GUI2048.java>
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
 *  A GUI runner for your solution to the 2025 Lab
 *  Unit 4: 2048
 *  
 *  @author Chris Thiel, OFMCap
 *  @version July 15, 2025
 *  
 *  Make sure to write a getScore() method in your Game2048 class
 *  as well as a getGameBoard() method.  Alternatively,
 *  you can write your own draw(Graphics g) method, and call it
 *  from this class's paintComponent method.
 */

public class GUI2048 extends JPanel implements KeyListener
{

	private static int WIDTH = 800, HEIGHT = 800;
	private static int LEFT_ARROW = 37, UP_ARROW = 38, 
			           RIGHT_ARROW = 39, DOWN_ARROW = 40;
	private Font titleFont, regularFont;
	private int keyCode, boardSize;
	private int[][] board;
	private char c;
	String message;
	private Game2048 myGame;
	

	public GUI2048()
	{

		myGame = new Game2048();
		board = myGame.getBoard();
		boardSize = board.length;
		message = "Use arrow keys (or l, r, u, d for left, right, up, down)";
		titleFont = new Font("Roman", Font.BOLD, 18);
		regularFont = new Font("Helvetica", Font.PLAIN, 12);
		keyCode=0;
		c='-';
	}
	public static void main(String[] args) {
		GUI2048 app= new GUI2048();
		JFrame window = new JFrame("2048 Game");
		window.setSize(WIDTH, HEIGHT);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.getContentPane().add(app);
		window.addKeyListener(app);
		window.setVisible(true);

	}
	public void paintComponent(Graphics g){
		super.paintComponent(g);
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, getWidth(),getHeight());
		g.setColor(Color.BLUE);
		
		g.setFont(new Font("Arial", Font.PLAIN, 48));
		g.drawString("2048 Game", WIDTH/3, 40);
		g.setFont(titleFont);
		g.setColor(Color.BLACK);
		g.drawString("Score: " + myGame.getScore(), 4*WIDTH/5, 40);
		g.drawString( message , 20, WIDTH - 50);

		g.setFont(regularFont);
		g.drawString("Version 1.0", 20, 50);
		g.setFont(new Font("Arial", Font.PLAIN, 48));
		g.setColor(Color.red);
		drawBoard(g);


	}
	
	public void drawBoard(Graphics g) {
		int size = HEIGHT/(boardSize +1);
		int top = 60;
		int left = WIDTH/2 - 2 * size;
		g.setFont(new Font("Arial", Font.BOLD, 48));
		for(int r = 0; r < boardSize; r++)
			for(int c = 0; c < boardSize; c++)
			{
				if (board[r][c] != 0)
					g.drawString (""+board[r][c], left+c*size + size/3, 
							                      top + r*size + 3*size/4);
			}
		g.setColor(Color.BLACK);
		for(int r = 0; r <= boardSize; r++) {
			g.drawLine(left, top + size*r, left + boardSize*size, top +size*r);
		}

		for(int c = 0; c <= boardSize; c++){
			g.drawLine(left+c*size, top ,left+c*size, top + boardSize* size);
		}
	}

	// These 3 methods need to be declared to implement the KeyListener Interface
	@Override
	public void keyTyped(KeyEvent e) {}

	@Override
	public void keyPressed(KeyEvent e) 
	{
		keyCode=e.getKeyCode();
		c=e.getKeyChar();
		if (keyCode == LEFT_ARROW || c == 'l')
		{
			myGame.moveLeft();
			myGame.mergeLeft();
			myGame.moveLeft();
			message = "left";
		} 
		else if (keyCode == RIGHT_ARROW || c == 'r')
		{
			myGame.moveRight();
			myGame.mergeRight();
			myGame.moveRight();
			message = "right";
		} 
		else if (keyCode == UP_ARROW || c == 'u')
		{
			myGame.moveUp();
			myGame.mergeUp();
			myGame.moveUp();
			message = "up";
		} 
		else if (keyCode == DOWN_ARROW || c == 'd' ) 
		{
			myGame.moveDown();
			myGame.mergeDown();
			myGame.moveDown();
			message = "down";
		} 
		else 
		{
			message = c+ " is an invalid choice!";
			
		}
		if (message.length() < 6 && !myGame.gameOver())
			myGame.add2ToBoard();
		if (myGame.gameOver())
			message = "Game Over - You reached "+ myGame.max();
		repaint();
	}

	@Override
	public void keyReleased(KeyEvent e) {}

}

</code>
===== Making an executable jar file =====

Any computer with the [[https://www.java.com/en/download/manual.jsp|Java runtime ]] installed can play your version of the 2048 Game. 


==== Using Eclipse ====

  - From the ''File'' menu, select Export
  - In the ''Java'' folder, select Runnable JAR file
  - Press the ''Next'' Button
  - Under the ''Launch Configuration'' your project that runs the GUI2048's ''main'' method
  - Under ''Library handling'' select ''Extract required libraries into JAR''
  - Select the ''Export destination'' (so you file the java executable later!)
  - Press ''Finish'' button (even if you're American)