/*  PositionRenderer - A class to render chessboard squares.  Copyright (C) 2003 The Java-Chess team <info@java-chess.de>  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 java.awt.*;import javax.swing.*;/** * This class renders a position on the chessboard, * no matter if it is empty or a piece on the square. */class PositionRenderer extends JLabel {    // Instance variables.        // Constructors    /**     * Create a new position rendering for a empty position.     */    PositionRenderer() {	super();  // Create a empty JLabel instance.	// Even if we do not have to render an image yet, it might	// get added later, when a piece moves on this square.	setHorizontalAlignment( CENTER);	setVerticalAlignment( CENTER);    }    /**     * Create a new position rendering with a given image of a piece.     *     * image The image for the rendering.     */    PositionRenderer( Image image) {	super( new ImageIcon( image));    }    // Methods    /**     * Move a piece from another position to this one.     *     * positionRenderer The position renderer for the source.     */    void getPieceFrom( PositionRenderer positionRenderer) {	setIcon( positionRenderer.getIcon());	positionRenderer.setIcon( null);    }    /**     * Set a new icon and align it properly.     *     * @param icon The new icon.     */    public void setIcon( ImageIcon icon) {	super.setIcon( icon);	if( icon != null) {	    invalidate();	} else {	    revalidate();	}    }}