recordcanvas.java

俄罗斯方块的java源码 可以运行

package hujkay.record;
import hujkay.* ;

import javax.microedition.lcdui.*;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;


public class RecordCanvas extends Canvas implements CommandListener {

	private Command okcommand = new Command("OK",Command.OK,1) ;
	private Block block ;
	private String dbname = "hightscore" ;
	//前三甲的分数
	private int score[] = new int[5];
	private int id[] = new int[5];
	private int inputscore   = 0;
	private int GAME_ERR = 0 ;
	private int GAME_ACTIVE = 1 ;
	private int currentstate ;
	private int wide , height ;
	private boolean breakrecord ;
	private int  space = 50 ;
	private char words[][] = {{'F','i','r','s','t',' ',':',' '},
			{'S','e','c','o','n','d',' ',':',' '},
			{'T','h','i','r','d',' ',':',' '},
			{'F','A','I','L',' ','T','O',' ','O','P','E','N',' ','R','E','C','O','R','D','!'  },
			{'C','o','n','g','r','a','t','u','l','a','t','i','o','n','s',' ','o','n',' ','n','e','w',' ','r','e','c','o','r','d','!'}
			} ;
	
	public void initdata()
	{
		int i ;
		for( i = 0 ;i < 5 ;i ++)
			score[i] = id[i] = 0 ;
		wide = this.getWidth() ;
		height = this.getHeight() ;
		breakrecord = false ;
	}
	
	public RecordCanvas()
	{
		
		this.addCommand(okcommand) ;
		this.setCommandListener(this);
		start();
	}
		
	public RecordCanvas(Block block)
	{
		this.block = block ;
		this.addCommand(okcommand) ;
		this.setCommandListener(this);
		start();
	}
	public RecordCanvas( Block b , int inputscore)
	{
		this.block = b ;
		this.inputscore = inputscore ;
		this.addCommand(okcommand) ;
		this.setCommandListener(this);
		start() ;
	}
	
	public RecordStore opendb( String s)
	{
		//检查数据
		RecordStore rs = null ;
		
		if(s.length() > 32 || s.length() == 0)
			return null ;
		try
		{
			rs = RecordStore.openRecordStore(s,true) ;
			return rs ;
		}catch(Exception e)
		{
			return null ;
		}
	}
	
	public boolean deletedb(String s)
	{
		if(s.length() > 32 || s.length() == 0)
			return false ;
		try
		{
			RecordStore.deleteRecordStore(s) ;
		}catch(Exception e)
		{
			return false ;
		}
		return true ;
	}

	public byte[] encode( int m)
	{
		byte[] s = null;
		int count = 0 , tmp;
		if( m == 0 )
		{
			s = new byte[1] ;
			s[0] = 0 ;
			return s ;
		}
		
		tmp = m ;
		while( tmp != 0)
		{
			tmp /= 128 ;
			count ++ ;
		}
		
		tmp = m ; s = new byte[count] ;
		while( count > 0)
		{
			count -- ;
			s[count] = (byte)(tmp % 128) ;
			tmp /= 128 ;
		}
		return s ;
	}
	
	public int  decode(byte[] b)
	{
		int sum = b[0] ;
		for( int i = 1 ;i < b.length ; i ++ )
		{
			sum = sum * 128 + b[i];
		}
		
		return sum ;
	}

	public int max( int m , int n )
	{
		return m>n?m:n ;
	}
	
	public void sort( int m)
	{
		score[m] = inputscore ;
		id[m] = - 1 ;
		int tmp ;
		
		int i , j ;
		for( i = 0 ;i  <= m ;i ++ )
			for( j = i + 1; j <= m ; j ++ )
			{
				if( score[i] < score[j])
				{
					tmp = score[i] ;score[i] = score[j] ; score[j] = tmp ;
					tmp = id[i] ; id[i] = id[j] ;id[j] = tmp ;
				}
			}
	}
	
	public void travelRS(RecordStore rs)
	{
		int  i = 0;
		try
		{
			RecordEnumeration re = rs.enumerateRecords(null,null,false) ;
			//System.out.println("There are " + re.numRecords() +	" in RecordStore") ;
			while(re.hasNextElement())
			{
				id[i] = re.nextRecordId() ;
				score[i] = decode(rs.getRecord(id[i])) ;
			    //System.out.print(score[i]+"\n");
				//System.out.println(decode(re.nextRecord()))	;
			    i ++ ;
			}
			//对数据进行排序
			sort(i) ;
			if(re.numRecords() >= 3)
			{
				//就必须更新数据
				if(score[i] != inputscore)//最后一名是不是这个数据的话
					//那么就开始更新了
				{
					rs.setRecord(id[i],encode(inputscore),0,encode(inputscore).length);
					breakrecord = true ;//打破记录了
				}
			}
			else
			{
				//就必须记录这个数据
				rs.addRecord(encode(inputscore),0,encode(inputscore).length);
				breakrecord = true ;//打破记录了
			}
		}
		catch(Exception e)
		{
		}
		repaint();
	}
	
	public void start()
	{
		initdata() ;
		RecordStore rs = null ;
		rs = opendb(dbname) ;
		currentstate = GAME_ERR ;
		if( rs == null )
		{
			repaint() ;
			return ;
		}
		else
		{
			try
			{
				//byte[] data = encode(300) ;
				//rs.addRecord(data,0,data.length);
				//rs.addRecord(encode(100),0,encode(100).length) ;
				//rs.addRecord(encode(200),0,encode(200).length);
				
				int k ;
				//k = 
				travelRS(rs) ;
				//读取
				currentstate = GAME_ACTIVE ;
			}
			catch(Exception e)
			{
				
			}
		}
		repaint();
	}
	
	public char[] converttochar(int number , int s)
	{
		char t[] = new char[20] ;
		int i , tmp = s;
		if( tmp == 0)
		{
			t[0] = '0'; 
			t[1] = '\0' ;
			
		}
		else
		{
			i = 0 ;
			while( tmp != 0 )
			{
				tmp /= 10 ;
				i ++ ;
			}
			tmp =  s;t[i] = '\0' ;
			while( tmp != 0)
			{
				t[--i] = ( char )( '0' + tmp % 10);
				tmp /= 10 ;
			}
		}
		return t ;
	}
	
	
	public void clear(Graphics g)
	{
		g.setColor(255,255,255) ;
		g.fillRect(0,0,this.getWidth(),this.getHeight());
		g.setColor(0,0,0);
	}
	
	protected void paint(Graphics g) {
		// TODO Auto-generated method stub
		clear(g);
		if( inputscore == 0 )
			this.breakrecord = false ;
		if(this.currentstate != GAME_ACTIVE)
		{
			g.drawChars(words[3],0,words[3].length,wide/7 ,height/2,0);
		}
		else
		{
			//破纪录了么？
			char Buffer[] ;
			for( int i = 0 ; i < 3 ;i ++  )
			{
				//System.out.println(score[i]);
				Buffer = converttochar(i,score[i]) ;
				g.drawChars(words[i],0,words[i].length,wide/4 ,height/6 * (i +2),0);
				g.drawChars(Buffer,0,Buffer.length,wide/2,height/6 * (i +2),0) ;
			}
			
			//破纪录了
			if(this.breakrecord)
				g.drawChars(words[4],0,words[4].length,wide/10 ,height/6 *5,0);
		}

	}

	public void commandAction(Command arg0, Displayable arg1) {
		// TODO Auto-generated method stub
		block.mangeaction(0,2);

	}

}