ChessGame

[Dastagir]

hello,i'm new in java & i'm facing problems with making a 2 player chess game.i've inserted the pieces & made the pieces move,but i'm stuck there.i'm not finding how to ensure valid moves.anyone pls get me some help...

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.applet.*;
 

public class ChessGame extends JFrame implements MouseListener, MouseMotionListener {
  JLayeredPane layeredPane;
  JPanel chessBoard;
  JLabel chessPiece;
  int xAdjustment;
  int yAdjustment;
 
  public ChessGame(){
  Dimension boardSize = new Dimension(800, 800);
 
  
 layeredPane = new JLayeredPane();
  getContentPane().add(layeredPane);
  layeredPane.setPreferredSize(boardSize);
  layeredPane.addMouseListener(this);
  layeredPane.addMouseMotionListener(this);//for dragging

  //Add a chess board to the Layered Pane 
 
  chessBoard = new JPanel();
  layeredPane.add(chessBoard, JLayeredPane.DEFAULT_LAYER);
  chessBoard.setLayout( new GridLayout(8, 8) );
  chessBoard.setPreferredSize( boardSize );
  chessBoard.setBounds(0, 0, boardSize.width, boardSize.height);
 
  for (int i = 0; i < 64; i++) {
  JPanel square = new JPanel( new BorderLayout() );
  chessBoard.add( square );
 
  int row = (i / 8) % 2;
  if (row == 0)
  square.setBackground( i % 2 == 0 ? Color.RED : Color.GREEN );
  else
  square.setBackground( i % 2 == 0 ? Color.GREEN : Color.RED );
  }
 
 
 //Black pieces
  JLabel piece = new JLabel( new ImageIcon("D:/`studY/Project/br.gif") );
  JPanel panel = (JPanel)chessBoard.getComponent(0);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bn.gif"));
  panel = (JPanel)chessBoard.getComponent(1);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bb.gif"));
  panel = (JPanel)chessBoard.getComponent(2);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bk.gif"));
  panel = (JPanel)chessBoard.getComponent(3);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bq.gif"));
  panel = (JPanel)chessBoard.getComponent(4);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bb.gif"));
  panel = (JPanel)chessBoard.getComponent(5);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bn.gif"));
  panel = (JPanel)chessBoard.getComponent(6);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/br.gif"));
  panel = (JPanel)chessBoard.getComponent(7);
  panel.add(piece);
  
  for (int i=8;i<=15;i++){
  piece = new JLabel(new ImageIcon("D:/`studY/Project/bp.gif"));
  panel = (JPanel)chessBoard.getComponent(i);
  panel.add(piece);
  }
  
  //white pieces
  piece = new JLabel( new ImageIcon("D:/`studY/Project/wr.gif") );
  panel = (JPanel)chessBoard.getComponent(56);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wn.gif"));
  panel = (JPanel)chessBoard.getComponent(57);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wb.gif"));
  panel = (JPanel)chessBoard.getComponent(58);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wq.gif"));
  panel = (JPanel)chessBoard.getComponent(59);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wk.gif"));
  panel = (JPanel)chessBoard.getComponent(60);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wb.gif"));
  panel = (JPanel)chessBoard.getComponent(61);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wn.gif"));
  panel = (JPanel)chessBoard.getComponent(62);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wr.gif"));
  panel = (JPanel)chessBoard.getComponent(63);
  panel.add(piece);
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wp.gif"));
  panel = (JPanel)chessBoard.getComponent(48);
  panel.add(piece);
  
  for (int i=49;i<=55;i++){
  piece = new JLabel(new ImageIcon("D:/`studY/Project/wp.gif"));
  panel = (JPanel)chessBoard.getComponent(i);
  panel.add(piece);
  }
  
   
  }
 
    @Override
  public void mousePressed(MouseEvent e){
  chessPiece = null;
  Component c =  chessBoard.findComponentAt(e.getX(), e.getY());
 
  if (c instanceof JPanel) 
  return;
 
  Point parentLocation = c.getParent().getLocation();
  xAdjustment = parentLocation.x - e.getX();
  yAdjustment = parentLocation.y - e.getY();
  chessPiece = (JLabel)c;
  chessPiece.setLocation(e.getX() + xAdjustment, e.getY() + yAdjustment);
  chessPiece.setSize(chessPiece.getWidth(), chessPiece.getHeight());
  layeredPane.add(chessPiece, JLayeredPane.DRAG_LAYER);
  }
 
  //Move the chess piece around
  
  public void mouseDragged(MouseEvent me) {
  if (chessPiece == null) return;
 chessPiece.setLocation(me.getX() + xAdjustment, me.getY() + yAdjustment);
 }
 
  //Drop the chess piece back onto the chess board
 
  public void mouseReleased(MouseEvent e) {
  if(chessPiece == null) return;
 
  chessPiece.setVisible(false);
  Component c =  chessBoard.findComponentAt(e.getX(), e.getY());
 
  if (c instanceof JLabel){
  Container parent = c.getParent();
  parent.remove(0);
  parent.add( chessPiece );
  }
  else {
  Container parent = (Container)c;
  parent.add( chessPiece );
  }
 
  chessPiece.setVisible(true);
  }
 
  public void mouseClicked(MouseEvent e) {
  
  }
  public void mouseMoved(MouseEvent e) {
 }
  public void mouseEntered(MouseEvent e){
  
  }
  public void mouseExited(MouseEvent e) {
  
  }
  
  public static void main(String[] args) {
  
      JFrame frame = new ChessGame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.pack();
  frame.setResizable(true);
  frame.setLocationRelativeTo( null );
  frame.setVisible(true);
 }
}

[Norm]

how to ensure valid moves

I think I saw a post on this forum that had the logic for checking valid moves. Try doing a Search on the forum.
One way would be a brute force method. Compute the valid moves for a piece one at a time and as you are doing it see if the move you are testing is one of the computed moves.

[Dastagir]

thnX a lot fo' that info,norm :)