import java.awt.*;
import java.awt.geom.*;
import java.applet.*;
import java.awt.event.*;

public class Ring extends Applet implements ActionListener {
    int keskx, kesky, ruute=10, raadius=30;
    TextField rr , ra;
    //Shape kujund;
    public void init(){
       rr  = new TextField(3);
       ra = new TextField(3);
       add(rr);
       add(ra);
       rr.addActionListener(this);
       ra.addActionListener(this);
    
    }
       
    public void actionPerformed (ActionEvent e){
       ruute=Integer.parseInt(ra.getText());
       raadius=Integer.parseInt(rr.getText());       
       repaint();
    }
    
    public void paint(Graphics g)
    {
        keskx=getSize().width/2;
        kesky=getSize().height/2;
        int rl = Math.max(getSize().height, getSize().width)/ruute;
        for(int n=0; n<getSize().height; n+=rl){
           for(int m=0; m<getSize().width; m+=rl){
              g.setColor(Color.black);
              g.drawRect(m,n,rl-1,rl-1);
              if(onRingis(m+rl/2, n+rl/2)){
                 g.setColor(Color.yellow);
                 g.fillRect(m+1,n+1, rl-2, rl-2);
              }
           }
        }
        g.drawOval(keskx-raadius, kesky-raadius, raadius*2, raadius*2);
        g.drawOval(keskx-raadius-1, kesky-raadius-1, raadius*2+2, raadius*2+2);
    }

    public boolean onRingis(int x, int y){
       if(Math.sqrt(Math.pow(keskx-x,2)+Math.pow(kesky-y,2))>raadius)
          return(false);
       return(true);
    }
   
}