pieceslayer.java

chess 一个beguanyu国际象棋的一个Java源码

/*
	PiecesLayer - A component to hold the pieces of a chess game.

	Copyright (C) 2003 The Java-Chess team <[e-mail]>

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

package de.java_chess.javaChess.renderer2d;

import de.java_chess.javaChess.*;
import de.java_chess.javaChess.board.*;
import de.java_chess.javaChess.piece.*;
import de.java_chess.javaChess.ply.*;
import de.java_chess.javaChess.position.*;
import java.awt.*;
import javax.swing.*;


/**
 * This class implements the functionality to hold the pieces of a
 * chessboard.
 */
class PiecesLayer extends JPanel {

		// Instance variables

		private Board _board;

		private ChessSet _set;

		/**
		 * Flag to indicate of the moves are animated.
		 */
		private boolean _animatedMoves = false;

		/**
		 * The layer to animate the moved pieces.
		 */
		private AnimationLayer _animationLayer;


		/**
		 * The labels for all the squares.
		 */
		private PositionRenderer [] _square = new PositionRenderer[64];

		PiecesLayer( Board board) {
	super( new GridLayout(8,8));
	_set = new ChessSet(this);

	_animationLayer = new AnimationLayer( this);

				_board = board;
				int _boardSize = 8 * ChessBoardRenderer2D.getSquareSize();
	setPreferredSize( new Dimension( _boardSize, _boardSize));
	setBounds( 0, 0 , _boardSize, _boardSize);
	setOpaque(false);
	repaintBoard();
		}

		final void repaintBoard() {
	// removeAll();

	// Create a renderer for each chessboard square

	Position pos = new PositionImpl( 0);  // Avoid to create new position instances for each square

	for( int s = 0; s < 64; s++) {
			pos.setSquareIndex( s);
			Piece p = _board.getPiece( pos);
			_square[ s] = ( p != null ? new PositionRenderer( new PieceRenderer( p.getColor(), p.getType(), _set, this)) : new PositionRenderer());
	}

	// Remove all the squares, in case this is a reset and the pieces layer already contains the
	// squares of an existing board.
	removeAll();

	// The order of the component adding is different then the order of the chessboard squares.
	// _square[0] = square a1 of the chessboard, but the components are added from the left
	// upper square (= a8)
				for( int s = 63; s >= 0; s--) {
			add( _square[ ( s & ~7) + ( 7 - ( s & 7))]);
	}
	repaint();
		}

		/**
		 * Render a ply.
		 *
		 * @param ply The ply to render.
		 */
		public final void doPly( Ply ply) {
	if( _animatedMoves) {
			getAnimationLayer().animatePly( ply);
			getAnimationLayer().start();
			repaint();
	} else {
			// Check, if it was a castling
			if( ply instanceof CastlingPly) {
		int source = ply.getSource().getSquareIndex();
		if( ( (CastlingPly)ply).isLeftCastling()) {
				_square[ source - 2].getPieceFrom( _square[ source]);
				_square[ source - 1].getPieceFrom( _square[ source - 4]);  // Move the rook to the right
		} else {
				_square[ source + 2].getPieceFrom( _square[ source]);
				_square[ source + 1].getPieceFrom( _square[ source + 3]);  // Move the rook to the left
		}
			} else {
		// If a pawn has just reached the last row
		if(ply instanceof TransformationPly) {

				// Copy the piece from source square to destination square.
				_square[ ply.getDestination().getSquareIndex()].getPieceFrom( _square[ ply.getSource().getSquareIndex()]);

				// Now change the rendering to the new piece type.
				_square[ ply.getDestination().getSquareIndex()].setIcon( new ImageIcon( new PieceRenderer( ply.getDestination().getSquareIndex() < 8
												? Piece.BLACK : Piece.WHITE, ( (TransformationPly)ply).getTypeAfterTransformation(), _set, this)));
		} else {
				// Copy the piece from source square to destination square.
				_square[ ply.getDestination().getSquareIndex()].getPieceFrom( _square[ ply.getSource().getSquareIndex()]);

				// If it's a en passant ply, remove the attacked pawn.
				if( ply instanceof EnPassantPly) {
			_square[ ( (EnPassantPly)ply).getAttackedPosition().getSquareIndex()].setIcon( null);
				}
		}
			}
			repaint();
	}
		}

		/**
		 * Get the current animation layer.
		 *
		 * @return The current animation layer.
		 */
		final AnimationLayer getAnimationLayer() {
	return _animationLayer;
		}

		/**
		 * Get the position renderer for a given square.
		 *
		 * @param squareIndex The index of the square.
		 *
		 * @return The position renderer for the given square.
		 */
		final PositionRenderer getPositionRenderer( int squareIndex) {
	return _square[ squareIndex];
		}

		final void clearBoard()
		{

			// Create a renderer for each chessboard square
			Position pos = new PositionImpl( 0);  // Avoid to create new position instances for each square

			for( int s = 0; s < 64; s++)
			{
				pos.setSquareIndex( s);
				_square[ s ] = new PositionRenderer();
			}

			// Remove all the squares, in case this is a reset and the pieces layer already contains the
			// squares of an existing board.
			removeAll();

			// The order of the component adding is different then the order of the chessboard squares.
			// _square[0] = square a1 of the chessboard, but the components are added from the left
			// upper square (= a8)
			for( int s = 63; s >= 0; s--)
			{
				add( _square[ ( s & ~7) + ( 7 - ( s & 7))]);
			}
			repaint();
		}
}