gaem.java

j2me游戏引擎

/*        
        GAEM - Graphical Adventure Engine for Mobiles (version 0.1)
        Copyright (C) 2005 Victor Borrull
        
        This file is part of GAEM.
        GAEM 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.
        GAEM 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
*/

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class GAEM extends MIDlet {
	Display pantalla;
	CanvasJuego game;
        FormTitle title;
        FormHelp help;
	boolean primeraVez = true;
        private boolean engineLoaded = false;
        private boolean helpLoaded = false;

	public GAEM() {
                title = new FormTitle(this);
	}
        
/**     This method changes the current Display to another. If the current Display is the game itself (new game or load game [CanvasJuego])
*       also stops its respective Thread. The different Screens are: TitleScreen, NewGame, LoadGame, Help.
*                                                                       0           1 T      1 F      2
*/
        public void changeScreen(int screenNumber, boolean newG) {
                System.out.println("Changing screen in MIDlet...");
                if (newG) {        //new game (or title or help)
                        if (screenNumber == 0) {                           //title screen
                                if (engineLoaded)
                                        game.stop();
                                pantalla.setCurrent(title);
                        } else if (screenNumber == 1) {                    //new game
                                        game = new CanvasJuego(this, true);
                                        engineLoaded = true;
                                game.start();
                                pantalla.setCurrent(game);
                        } else if (screenNumber == 2) {                    //help screen
                                if (!helpLoaded) {
                                        help = new FormHelp(this);
                                        helpLoaded = true;
                                }
                                pantalla.setCurrent(help);
                        }
                } else {        //load game
                        if (screenNumber == 1) {
                                if (!engineLoaded) {
                                        game = new CanvasJuego(this, false);
                                        engineLoaded = true;
                                }
                                game.start();
                                pantalla.setCurrent(game);
                        }
                }
        }
        public void changeScreen(int i) {       //called for title and help
                this.changeScreen(i, true);
        }
	protected void startApp() {
		if (primeraVez) {
			pantalla = Display.getDisplay(this);
			this.changeScreen(0);
			primeraVez = false;
		} else {

                }
	}
	public void salir() {
		destroyApp(true);
		notifyDestroyed();
	}

	protected void pauseApp() {
	}

	protected void destroyApp(boolean unconditional) {
                if (engineLoaded)
		        game.stop();
	};

}