import java.awt.*;
import java.applet.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class Graafik1 extends Applet implements ActionListener{
  TextField tf=new TextField(5);
  public Graafik1(){
    add(tf);
    tf.addActionListener(this);
  }
  public void paint(Graphics g){
g.setColor(Color.black);
       g.drawLine(4000,220,0,220 );
       g.drawLine(220,4000,220,0 );
    int vanax=140;
    int vanay=60;
    for(int x=-80; x<=80; x++){
      int uusx=x+220;
      int uusy=220-(x*x/40);
      g.drawLine(vanax, vanay, uusx, uusy);
      vanax=uusx;
      vanay=uusy;
    }
  }
 
  public void actionPerformed(ActionEvent e){
    int nr=Integer.parseInt(tf.getText().trim());
    Graphics g=getGraphics();
   g.drawLine(nr+220, 220, nr+220, 220-nr*nr/40);
  g.drawLine(nr+220,220-nr*nr/40,220,220-nr*nr/40);
  }

  public static void main(String argumendid[]){
    Frame f=new Frame("Ruutfunktsiooni graafik");
    f.add(new Graafik1());
    f.setSize(250, 250);
    f.setVisible(true);
  }
}