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Thread: Connect 4 Help

  1. #1
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    Default Connect 4 Help

    I have my connect four game but the checkwin algorithms won't work I have two other files called GameBoard and BoardSquare. The BoardSquare file sets the colors and types for the checkered pieces and the GameBoard file sets the 2d array...Can anyone tell me whats wrong?
    public class ConnectFour extends JFrame {
    	// making a gameboard object
    	static JLabel label = new JLabel(" ");
    	static GameBoard board = new GameBoard();
    	static public int i=2;
    	static final int empty = 1;
    	static boolean win = false;
    	static int CurrentPlayer = 0;
        public ConnectFour() {
        	setLayout(new BorderLayout());
    		// putting board on frame
    		add(board,BorderLayout.CENTER);
    		add(label,BorderLayout.NORTH);
        }
     
        public static void main(String[] args) {
    		//setting my frame to the connect four frame
        	JFrame frame = new ConnectFour();
        	frame.setSize(700, 600);
        	frame.setLocationRelativeTo(null); // Center the frame
        	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        	frame.setVisible(true);
     
        }
     
        public static void updateBoard(int row, int col){
     		//checks to see if spot is empty
     		//two seprate loops to find bottom square in column
     		//
    		BoardSquare clicked = board.Array[row][col];
    		//if its empty then change the players turn
    		int l = row-1;
    		while(row<5 && board.Array[row+1][col].GetType() == empty){
    			clicked = board.Array[row+1][col];
    			row = row+1;
    		}
        	if (clicked.GetType() == 1){
    			clicked.setType(i);
    			if (i==3){
    				i=2;
    				label.setText("red's turn");
    				checkWin(board.Array);
    			}
    			else{
    				i=3;
    				label.setText("blacks turn");
    				checkWin(board.Array);
    			}
        	}
    		}
    		public static void checkWin(BoardSquare [][]board){
    			int numMove = 42;
    			win = false;
    			checkHorizontal(6, 7);
    			checkVertical(6, 7);
    			checkBackDiag(6, 7);
    			checkDiag(6, 7);
     
     
     
    //checks for tie game
    			 if(win == false && numMove == 6*7){
    				System.out.println("Tie");
    }
    }
    	public static void checkHorizontal (int row, int column){ // checks for a horizontal win
    			int count = 0;
     
    			for (int i = 0; i < 6 && board.Array[row][i].GetType() == CurrentPlayer; i++){
    				count++; // increase count for every continuous piece from the same player
    			}
     
    			for (int i = 0; i >= 0 && board.Array[row][i].GetType()== CurrentPlayer; i--){
    				count++;
    			}
    			if (count >= 4){ // if count is greater then the number of continuous pieces required to win, the current player is declared the winner
    				win = true;
    				System.out.print("you win");          //declares a win
    			}
    			}
     
    //checks for a vertical win
    	public static void checkVertical (int row, int column){
    			int count = 0;
    			for (int i = row; i < row && board.Array[column][i].GetType() == CurrentPlayer; i++){
    				count++; // increase count for every continuous piece from the same player
    			}
     
    			for (int i = row; i < row && board.Array[column][i].GetType() == CurrentPlayer; i--){
    				count++;
    			}
    			if (count >= 4){
    				win = true;
    				System.out.print("you win");        //declares a win
    }
     
    }
    	public static void checkDiag (int row, int column){
    			int count = 0;
    			int j;
    			for (i = row, j = column;i >= 0 && j < 6 && board.Array[i][j].GetType()==CurrentPlayer;i--,j++){
    				count++;
    				}
    			for (i = row, j = column;i >= 0 && j < 6 && board.Array[i][j].GetType()==CurrentPlayer;i++,j--){
    				count++;
    }
    			if (count >=4){
    				win = true;
    				}
    				}
    	public static void checkBackDiag(int row, int column){
    			int count = 0;
    			int j;
    			for (i = row, j = column;i >= 0 && j < 6 && board.Array[i][j].GetType()==CurrentPlayer;i++,j++){
    				count++;
    			}
    			for (i = row, j = column;i >= 0 && j < 6 && board.Array[i][j].GetType()==CurrentPlayer;i--,j--){
    				count++;
    			}
    			if (count >= 4){
    				win = true;
    				System.out.println("Winner");
    }
     
    }
    }


  2. #2
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    Default Re: Connect 4 Help

    Can anyone tell me whats wrong?
    You first...does it compile? Are there exceptions? Does it misbehave, and if so what do you expect and what do you get?

  3. #3
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    Default Re: Connect 4 Help

    It Compiles I got the checkHorizomntal code working by changing it to
    public static void checkHorizontal (){ // checks for a horizontal win
     
    			for (int row = 0; row < 6; row++) {
    				for (int col = 0; col < 4; col++) {
    					int count = 0;
    					for (int i = 0; i < 4 && board.Array[row][col+i].GetType() == CurrentPlayer+2; i++){
    						count++; // increase count for every continuous piece from the same player
    					}
     
    					if (count >= 4){ // if count is greater then the number of continuous pieces required to win, the current player is declared the winner
    						win = true;
    						System.out.print("you win");          //declares a win
    					}
    				}
    			}
     
    			}
    But now I'm getting an exception in my vertical code where if i place all the checkers in a single column I dont get an exception, but if I place two of the same colored pieces on top of each other I get exception java.lang.ArrayIndexOutOfBoundsException: 6
    My vertical code is
    	public static void checkVertical (){
    			for(int col = 0; col < 7; col++){
    				for(int row = 0; row< 6; row++){
    					int count = 0;
    					for (int i = 0; i < 4 && board.Array[row+i][col].GetType() == CurrentPlayer+2; i++){
    				count++; // increase count for every continuous piece from the same player
    				}
     
    			if (count >= 4){
    				win = true;
    				System.out.print("you win");        //declares a win
    }	}
    			}
    }

  4. #4
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    Default Re: Connect 4 Help

    Well onto a potential issue I see. Ok your nested loops do these part on paper.
    // Single chip near the top
    Column 0 - 6
    Row 5
    i = 1 && board.Array[row + i][col].getType()
     
    // 2 Same chips so adds to i to check 3rd chip
    Column 0-6
    Row 4
    i = 2 && board.Array[row + i][col].getType()
     
    // 3 Same chips so adds to i to check 4th chip
    Row = 3
    i = 3 && board.Array[row + i][col].getType()

    What row will it be searching for? I am thinking this is where your Out of bounds is happening

  5. #5
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    Default Re: Connect 4 Help

    Okay I got it all working thank you Ubiquitous, but how would I got about making the GUI in-editable once a winner is declared?

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    Default Re: Connect 4 Help

    setEnabled
    Improving the world one idiot at a time!

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