import java.awt.*;
import java.applet.*;

public class dla extends Applet implements Runnable {

	int dots=0;
	int highest=2;
	boolean place[][]= new boolean[600][600];
	int dot[] = new int[2];
	boolean baddot=true;
	int move;
	boolean stillgood=true;

	public void init(){
		setBackground(Color.black); 
		for(int a=0;a<=599;a++){place[1][a]=true;}
		}

	public void start(){
		Thread t = new Thread(this);
		t.start();

		}	

	public void paint(Graphics g){
		g.setColor(Color.white);
		for(int a=0;a<=599;a++){
			for(int b=0;b<=599;b++){
				if(place[a][b]){
					g.fillRect(b,600-a,1,1);
					}
				}
			}

		}

	public void run() {
		while(stillgood){				
			baddot=true;
			dot[0]=(int)(highest);
			dot[1]=(int)(Math.random()*595)+3;
			while(baddot){
				move=(int)(Math.random()*4);
				if(move==0 && dot[0]>1){dot[0]-=1;}
				if(move==1 && dot[0]<598){dot[0]+=1;}
				if(move==2 && dot[1]>1){dot[1]-=1;}
				if(move==3 && dot[1]<598){dot[1]+=1;}
				if(dot[0]>(highest+5)){baddot=false;}

				if(place[dot[0]-1][dot[1]] ^ place[dot[0]+1][dot[1]] ^ place[dot[0]][dot[1]-1] ^ place[dot[0]][dot[1]+1]){
					baddot=false;
					place[dot[0]][dot[1]]=true;
					if(dot[0]>highest){highest=dot[0];}
					dots++;
					if(dot[0]==597){stillgood=false;}
					}
				}
			if((dots%1000)==0){
				repaint();
				try{Thread.sleep(50);}
				catch(InterruptedException e){}
				}
			}
		}	
	}