supertank.java

本j2me坦克游戏是在Nokia平台下开发的

/*
 * @(#)SuperTank.java	0.20 02/11/07
 * Copyright (c) 2002 InterScape Creations. All Rights Reserved.
 */

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

public class SuperTank
    extends MIDlet
    implements CommandListener {

  public static Display display;
  public static icTankCanvas canvas; // The main screen
  private List opScreen = null;
  private Form helpScreen = null;

  private Command cancelCommand = new Command("CONTINUE", Command.SCREEN, 0);

  //   private Command selectCommand = new Command("SELECT", Command.SCREEN, 1);

  /*
   * Create the canvas
   */
  public SuperTank() {
    display = Display.getDisplay(this);
    canvas = new icTankCanvas(this, display);

    /*		canvas.setCommandListener(this);
         canvas.addCommand(exitCommand);
         canvas.addCommand(skipCommand);
            canvas.addCommand(pauseCommand);
            canvas.addCommand(helpCommand);*/
    /* alert.addCommand(okCommand);
     alert.addCommand(cancelCommand);
     alert.setCommandListener(this);
     alert.append("您确实要退出吗？");*/
  }

  public void startApp() throws MIDletStateChangeException {
    //System.out.println("startApp():");
    //  Display.getDisplay(this).setCurrent(canvas);
    canvas.firstTime = true;
    canvas.start();
  }

  public void pauseApp() {
    canvas.pause();
  }

  public void destroyApp(boolean unconditional) throws
      MIDletStateChangeException {
    canvas.destroy();
  }

  void exitRequested() {
    try {
      destroyApp(false);
      notifyDestroyed();
    }
    catch (MIDletStateChangeException ex) {}
  }

  /*
   * Respond to a command issued on the Canvas.
   */
  public void commandAction(Command c, Displayable s) {

    if (c == opScreen.SELECT_COMMAND && s == opScreen) {
      switch (opScreen.getSelectedIndex()) {
        case 0:
          canvas.paused1 = false;
          display.setCurrent(canvas);
          opScreen = null;
          break;
        case 1:
          canvas.paused1 = false;
          display.setCurrent(canvas);
          canvas.gameStatus = 2;
          canvas.gameSubStatus = 1;
          opScreen = null;
          break;
        case 2:
          showHelp();
          opScreen = null;
          break;
        case 3:
          try {
            destroyApp(false);
            notifyDestroyed();
            opScreen = null;
          }
          catch (MIDletStateChangeException ex) {}
          break;
        default:
          break;
      }
    }
    if (c == cancelCommand && s == helpScreen) {
      display.setCurrent(canvas);
      helpScreen.removeCommand(cancelCommand);
      canvas.paused1 = false;
      helpScreen = null;
    }
  }

  void showOption() {
    opScreen = new List("游戏选项", List.IMPLICIT);
    opScreen.append("返回", null);
    opScreen.append("跳过", null);
    opScreen.append("帮助", null);
    opScreen.append("退出", null);
    ///  	opScreen.addCommand(selectCommand);
    opScreen.setCommandListener(this);
    display.setCurrent(opScreen);
  }

  void showHelp() {
    helpScreen = new Form("游戏帮助");
    helpScreen.append("上键（数字键2）控制坦克向上移动\n");
    helpScreen.append("下键（数字键8）控制坦克向下移动\n");
    helpScreen.append("左键（数字键4）控制坦克向左移\n");
    helpScreen.append("右键（数字键6）控制坦克向右动\n");
    helpScreen.append("发射键（数字键5）发射炮弹\n");
    helpScreen.addCommand(cancelCommand);
    helpScreen.setCommandListener(this);
    display.setCurrent(helpScreen);
  }
}