menucanvas.java

俄罗斯方块的java源码 可以运行

package hujkay.menu;

import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.lang.*;
import java.util.Timer;

import javax.microedition.*;
import javax.microedition.midlet.*;
import java.util.TimerTask;

import java.io.*;
import hujkay.* ;
public class MenuCanvas extends Canvas  implements CommandListener{
	
	//菜单图片的开始位置
	private boolean fistloadpicture  = true;
	private int picturex , picturey ;
	//上下左右空白的地方
	private int blankleft , blanktop ;
	//当前的选项
	private int currentchoice ;
	private boolean redpicture ;
	//当前canvas的大小
	private int wide,height ;
	//图片变量
	private Image image[] = new Image[9] ;
	//当前是否活跃
	private boolean active = true;
	//背景的颜色设成（240,240,0）
	private boolean activeerr = false;
	//双缓冲
	private Image offcanvas ;
	private Timer timer ;
	private menuTask  menuTask ;
	private Command selectcommand = new Command("Select",Command.OK,1) ;
	private Command exitcommand = new Command("Exit",Command.EXIT,2) ;
	private Block block ;
	
	public  void restartnow()
	{
		active = true ;
		activeerr = false ;
		currentchoice = 0 ;
		redpicture = false ;
		currentchoice = 0 ;
		redpicture = false ;
	}
	//构造函数
	public MenuCanvas()
	{
		restartnow( );
		timer = new Timer();
		menuTask = new menuTask(this);
		timer.schedule(menuTask, 400, 400);
		this.addCommand(selectcommand) ;
		addCommand(exitcommand) ;
		this.setCommandListener(this);
	}
	
	public MenuCanvas(Block b)
	{
		this.block = b;
		restartnow( );
		timer = new Timer();
		menuTask = new menuTask(this);
		timer.schedule(menuTask, 400, 400);
		this.addCommand(selectcommand) ;
		addCommand(exitcommand) ;
		this.setCommandListener(this);
	}
//	读取图片数据
	private boolean readpictures()
	{
		if(fistloadpicture)
		{
			fistloadpicture = false ;
			try
			{
				image[0] = Image.createImage("/block/menu/0.png");
				image[1] = Image.createImage("/block/menu/1.png");
				image[2] = Image.createImage("/block/menu/2.png");
				image[3] = Image.createImage("/block/menu/3.png");
				image[4] = Image.createImage("/block/menu/4.png");
				image[5] = Image.createImage("/block/menu/5.png");
				image[6] = Image.createImage("/block/menu/6.png");
				image[7] = Image.createImage("/block/menu/7.png");
			}
			catch(Exception e)
			{
				return false ;
			}
		}
		return true ;
	}

	private void Initdata()
	{
		wide = this.getWidth() ;
		height = this.getHeight() ;
		if(wide > image[0].getWidth())
		{
			blankleft = ( wide - image[0].getWidth()) / 2 ;
			blanktop = ( height - image[0].getHeight()) / 2 ;
		}
	}
	private void clearcanvas(Graphics g)
	{
		g.setColor(0,240,240) ;
		g.fillRect(0,0,wide,height);
	}
	private void paintcanvas(Graphics g)
	{
		
		
		//检查数据合法与否
		if(currentchoice > 3)currentchoice = 0 ;
		if(currentchoice < 0 ) currentchoice = 3 ;
		
		//画图，使用自制双缓冲
		
		Graphics gg = offcanvas.getGraphics(); 
		clearcanvas(gg);	
		if(redpicture)
		{
			gg.drawImage(image[currentchoice*2 + 1],blankleft,blanktop,Graphics.LEFT|Graphics.TOP);
			redpicture = false ;
		}
		else
		{
			gg.drawImage(image[currentchoice*2 ],blankleft,blanktop,Graphics.LEFT|Graphics.TOP);
			redpicture = true ;
		}
		
		//输入到当前屏幕
		g.drawImage(offcanvas,0,0,Graphics.LEFT|Graphics.TOP);
	/*	try
		{
			clearcanvas(g) ;
			g.drawImage(image[7],0,0,Graphics.LEFT|Graphics.TOP);
		}
		catch(Exception e)
		{
		}*/
		
		
	}
	protected void paint(Graphics g) {
		// TODO Auto-generated method stub
		if(fistloadpicture)
		{
			readpictures();
			Initdata();
			offcanvas = Image.createImage(wide,height);
		}
		
		if( active)
		{
			if(!activeerr)
			{
				paintcanvas(g);
			}
			else
			{
				g.drawLine(0,0,100,100);
			}
		}
		else
			g.drawRect(0,0,100,100);
	

	}
	protected synchronized void keyPressed(int keyCode)
	{
		 switch(this.getGameAction(keyCode))
		 {
		 	case Canvas.UP:
		 		currentchoice -- ;
		 		break ;
		 	case Canvas.DOWN:
		 		currentchoice ++ ;
		 		break ;
		 }
	 	redpicture = false ;
	 	repaint();
	}
	
	
	
	//接口
	
	public void Hide()
	{
		this.active = false ;
	}
	public boolean IsOK()
	{
		return activeerr ;
	}
	
	public synchronized void  commandAction(Command c, Displayable d)
	{
		if(c.getLabel().equals("Select"))
		{
			if( this.currentchoice == 0)//启动游戏
				block.mangeaction(1,0) ;
			else if( this.currentchoice == 1)//启动记录
				block.mangeaction(2,0);
			else if(this.currentchoice == 2)//启动帮助
				block.mangeaction(3,0);
			else if( this.currentchoice == 3)//退出游戏
				block.mangeaction(4,0);
			
			
		}
		else if(c.getLabel().equals("Exit"))
		{
			block.mangeaction(4,0);
		}
	}

}