Making a radar

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

public class radar extends Applet implements Runnable
{
    Thread runner;
    Image Buffer;
    Graphics gBuffer;
    int angle;
    Rectangle hit;
    Rectangle target;
    boolean bhit;
    boolean stap1;     

    public void init()
    {   hit=new Rectangle(110,115,10,10);
        target= new Rectangle(200,0,200,200);
        Buffer=createImage(size().width,size().height);
        gBuffer=Buffer.getGraphics();
        
    }

    public void start()
    {
        if (runner == null)
        {
            runner = new Thread (this);
            runner.start();
        }
    }

    public void stop()
    {
        if (runner != null)
        {
            runner.stop();
            runner = null;
        }
    }

    public void run()
    {
        while(true)
        {   bhit  = hit.intersects(target);
            if(bhit){stap1=true;}
            else if (!bhit){stap1=false;}
            try {runner.sleep(10);}
            catch (Exception e) { }
           
            repaint();
        }
    }

    void drawStuff()
    {   
        gBuffer.setColor(Color.black);
        gBuffer.fillRect(0,0,size().width,size().height);
        Point p=new Point(size().width/2, size().height/2);   
        int LENGTH=140;
        double vector = angle * Math.PI*2 / 360.0;
        int vx=(int)(p.x+LENGTH*Math.sin(vector));
        int vy=(int)(p.y-LENGTH*Math.cos(vector));


        hit= new Rectangle(p.x,p.y,vx,vy);
        //r2.move ( r2.x,r2.y-4);
        gBuffer.setColor(Color.green);
        gBuffer.drawLine(hit.x,hit.y, hit.width ,hit.height);
        gBuffer.fillRect(target.x, target.y, target.width, target.height);
        gBuffer.setFont(new Font("Helvetica",Font.PLAIN,13));
        gBuffer.drawString("Angle="+angle+"°",10,20);
        
        if(angle<360) angle++;
         else angle=0;
         if(stap1){gBuffer.drawString("hit!!!!!!!!!",20,30);}
         else    {gBuffer.drawString("no hit",20,30);}

         }

    public void update(Graphics g)
    {
        paint(g);
    }

    public void paint(Graphics g)
    {
        drawStuff();
        g.drawImage (Buffer,0,0, this);
    }
}