/*
 * 創(chuàng)建日期 2005-6-24
 *
 * TODO 要更改此生成的文件的模板，請轉(zhuǎn)至
 * 窗口 － 首選項 － Java － 代碼樣式 － 代碼模板
 */
package game;

import java.util.Timer;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDletStateChangeException;

/**
 * @author Administrator
 *
 * TODO 要更改此生成的類型注釋的模板，請轉(zhuǎn)至
 * 窗口 － 首選項 － Java － 代碼樣式 － 代碼模板
 */
public class GameCtrl extends Canvas implements CommandListener{
	private final Command startCommand;
	private final Command quitCommand;
	private final SnakeMIDlet midlet;
	private Graphics graph;
	private Timer timer = new Timer();
	private NextFrame nextFrame;

	// 游戲結(jié)束標(biāo)志
	public boolean isGameOver = false;
	
	// 游戲開始標(biāo)志
	public boolean isGameRun = false;
	
	// 游戲積分
	public int score = 0;

	// 屏幕尺寸
	public int width = 0;
	public int height = 0;
	
	// 食物位置
	public int foodX = 0;
	public int foodY = 0;
	
	// 蛇身位置
	public int[] snakeX = {10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50 ,54, 58, 62, 66, 70, 74, 78, 82, 86};
	public int[] snakeY = {10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10};
	
	// 運動方向 [0,1,2,3——上，下，左，右]
	public int direction = 0; 

	// 食物圖象
	public Image foodImage = null;

	/**
	 * 
	 */
	public GameCtrl(SnakeMIDlet midlet) {
		super();
		
		// 保存MIDlet類對象
		this.midlet = midlet;

		// 得到屏幕尺寸
		width = getWidth();
		height = getHeight();
		
		// 設(shè)置食物位置
		foodX = width / 2;
		foodY = height / 2;
		
		try	{
			// 裝載食物圖象
			foodImage = Image.createImage("/food.png");			
		}catch(Exception e)	{}

		// 添加命令按鍵
		quitCommand = new Command("退出", Command.EXIT, 2);
		addCommand(quitCommand);
		
		startCommand = new Command("開始", Command.OK, 1);
		addCommand(startCommand);

		// 偵聽按鍵響應(yīng)
		setCommandListener(this);		
	}

	/* （非 Javadoc）
	 * @see javax.microedition.lcdui.Displayable#paint(javax.microedition.lcdui.Graphics)
	 */
	protected void paint(Graphics g) {
		graph = g;
		if (isGameOver == true && isGameRun == true){
			isGameRun = false;
			
			// 顯示logo
			Alert result = new Alert("本局積分", String.valueOf(score), null, AlertType.INFO);
				
			// 延遲4秒 
			result.setTimeout(2000);

			// 顯示閃屏界面
			midlet.display.setCurrent(result, this);			
			return;
		}

		if (isGameRun == true){
			// 白色清空畫布 
			graph.setColor(255, 255, 255);
			graph.fillRect(0, 0, width, height);
			
			// 繪制食物
			g.drawImage(foodImage, foodX, foodY, Graphics.HCENTER | Graphics.VCENTER);	
			
			// 繪制蛇身
			graph.setColor(0, 0, 255);
			for (int i = 0; i < 19; i++){
				graph.drawLine(snakeX[i], snakeY[i], snakeX[i + 1], snakeY[i + 1]);
			}				
		}
	}
	/* （非 Javadoc）
	 * @see javax.microedition.lcdui.CommandListener#commandAction(javax.microedition.lcdui.Command, javax.microedition.lcdui.Displayable)
	 */
	public void commandAction(Command arg0, Displayable arg1) {
		if (arg0 == startCommand){
			// 用戶開始游戲
			initialize();
		}
		
		if (arg0 == quitCommand){
			if (isGameRun == true){
				// 結(jié)束游戲
				isGameOver = true;
				isGameRun = false;
			
				// 關(guān)閉定時器
				nextFrame.cancel();
			}

			// 用戶退出游戲
			try{
				midlet.quit();
			}
			catch(MIDletStateChangeException e){}
		}
	}
	
	private void initialize() {
		// 初始化數(shù)據(jù)	
		score = 0;
		
		// 白色清空畫布 
		graph.setColor(255, 255, 255);
		graph.fillRect(0, 0, width, height);

		// 開啟定時器
		nextFrame = new NextFrame(this);
		timer.schedule(nextFrame, 300, 300);		

		// 重繪屏幕
		isGameOver = false;
		isGameRun = true;
		repaint();				
	}

	protected void keyPressed(int keyCode) {
		// 游戲結(jié)束后不處理按鍵
		if (isGameOver == true)
			return;
			
		// 得到按鍵動作
		int gameAction = getGameAction(keyCode);
		switch (gameAction) {
		case UP:
			direction = 0;
			break;			
		case DOWN:
			direction = 1;
			break;
		case LEFT:	
			direction = 2;
			break;
		case RIGHT:
			direction = 3;
			break;
		default:    
			break;
		}

		// 重繪屏幕
		repaint();
	}

}