/*
* Maze.java
*
* Created on 2005年12月2日, 下午1:04
*/
package com.j2medev.maze;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
/**
* This is the main class of the maze game.
*
* @author Carol Hamer
*/
public class Maze extends MIDlet implements CommandListener {
//----------------------------------------------------------------
// game object fields
/**
* The canvas that the maze is drawn on.
*/
private MazeCanvas myCanvas;
/**
* The screen that allows the user to alter the size parameters
* of the maze.
*/
private SelectScreen mySelectScreen;
//----------------------------------------------------------------
// command fields
/**
* The button to exit the game.
*/
private Command myExitCommand = new Command("Exit", Command.EXIT, 99);
/**
* The command to create a new maze. (This command may appear in a menu)
*/
private Command myNewCommand = new Command("New Maze", Command.SCREEN, 1);
/**
* The command to dismiss an alert error message. In MIDP 2.0
* an Alert set to Alert.FOREVER automatically has a default
* dismiss command. This program does not use it in order to
* allow backwards com
*/
private Command myAlertDoneCommand = new Command("完成", Command.EXIT, 1);
/**
* The command to go to the screen that allows the user
* to alter the size parameters. (This command may appear in a menu)
*/
private Command myPrefsCommand
= new Command("迷宫规模设置", Command.SCREEN, 1);
//----------------------------------------------------------------
// initialization
/**
* Initialize the canvas and the commands.
*/
public Maze() {
try { myCanvas = new MazeCanvas(Display.getDisplay(this));
myCanvas.addCommand(myExitCommand);
myCanvas.addCommand(myNewCommand);
myCanvas.addCommand(myPrefsCommand);
myCanvas.setCommandListener(this);
} catch(Exception e) {
// if there's an error during creation, display it as an alert.
Alert errorAlert = new Alert("error",
e.getMessage(), null, AlertType.ERROR);
errorAlert.setCommandListener(this);
errorAlert.setTimeout(Alert.FOREVER);
errorAlert.addCommand(myAlertDoneCommand);
Display.getDisplay(this).setCurrent(errorAlert);
}
}
//----------------------------------------------------------------
// implementation of MIDlet
/**
* Start the application.
*/
public void startApp() throws MIDletStateChangeException {
if(myCanvas != null) {
myCanvas.start();
}
}
/**
* Clean up.
*/
public void destroyApp(boolean unconditional)
throws MIDletStateChangeException {
myCanvas = null;
System.gc();
}
/**
* Does nothing since this program occupies no shared resources
* and little memory.
*/
public void pauseApp() {
}
//----------------------------------------------------------------
// implementation of CommandListener
/*
* Respond to a command issued on the Canvas.
* (reset, exit, or change size prefs).
*/
public void commandAction(Command c, Displayable s) {
if(c == myNewCommand) {
myCanvas.newMaze();
} else if(c == myAlertDoneCommand) {
try {
destroyApp(false);
notifyDestroyed();
} catch (MIDletStateChangeException ex) {
}
} else if(c == myPrefsCommand) {
if(mySelectScreen == null) {
mySelectScreen = new SelectScreen(myCanvas);
}
Display.getDisplay(this).setCurrent(mySelectScreen);
} else if(c == myExitCommand) {
try {
destroyApp(false);
notifyDestroyed();
} catch (MIDletStateChangeException ex) {
}
}
}
}
/*
* SelectScreen.java
*
* Created on 2005年12月2日, 下午1:06
*
* To change this template, choose Tools | Options and locate the template under
* the Source Creation and Management node. Right-click the template and choose
* Open. You can then make changes to the template in the Source Editor.
*/
package com.j2medev.maze;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Gauge;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
/**
* This is the screen that allows the user to modify the
* width of the maze walls..
*
* @author Carol Hamer
*/
class SelectScreen extends Form
implements ItemStateListener, CommandListener {
//----------------------------------------------------------------
// fields
/**
* The "Done" button to exit this screen and return to the maze.
*/
private Command myExitCommand = new Command("完成", Command.EXIT, 1);
/**
* The gague that modifies the width of the maze walls.
*/
private Gauge myWidthGauge;
/**
* The gague that displays the number of columns of the maze.
*/
private Gauge myColumnsGauge;
/**
* A handle to the main game canvas.
*/
private MazeCanvas myCanvas;
//----------------------------------------------------------------
// initialization
/**
* Create the gagues and place them on the screen.
*/
public SelectScreen(MazeCanvas canvas) {
super("Size Preferences"
