import java.applet.Applet;
import java.awt.*;
public class SpiroTest extends Applet {
   Scrollbar bar1, bar2;
   NewCanvas can;
   Panel pan, lpan, bar1pan, bar2pan;
   TextField text1, text2;
   Button drawit;

   public void init(){
      drawit = new Button("Draw the graph");
      bar1 = new Scrollbar(Scrollbar.HORIZONTAL,1,0,1,20);
      bar2 = new Scrollbar(Scrollbar.HORIZONTAL,3,0,-20,20);
      text1 = new TextField("inner  1");
      text2 = new TextField("outer  3");
      text1.setEditable(false);
      text2.setEditable(false);
      can = new NewCanvas();
      can.resize(300,300);
      can.setBackground(Color.yellow);
      pan = new Panel();
      setLayout(new BorderLayout());
      bar1pan = new Panel();
      bar1pan.resize(300,40);
      bar1pan.setLayout(new BorderLayout());
      bar1pan.add("North",bar1);
      bar1pan.add("South",text1);
      bar2pan = new Panel();
      bar2pan.resize(300,40);
      bar2pan.setLayout(new BorderLayout());
      bar2pan.add("North",bar2);
      bar2pan.add("South",text2);
       lpan = new Panel();
      lpan.setLayout(new BorderLayout());
      lpan.add("North",bar1pan);
      lpan.add("South",bar2pan);
            pan.setLayout(new BorderLayout());
      pan.add("South",lpan);
      pan.add("North",drawit);
      pan.add("Center",can);
      add("Center",pan);
   }

   public boolean handleEvent( Event e){
   if(e.target instanceof Scrollbar){
      int value = ((Scrollbar)e.target).getValue();
      if( e.target == bar1){
         text1.setText("inner " + Integer.toString(value));
     }
     else if( e.target == bar2){
         text2.setText("outer " + Integer.toString(value));
     } 
   }
   if( e.target == drawit){
        can.setvalue1(bar1.getValue());
        can.setvalue2(bar2.getValue());
        can.repaint();
     }
        return true;   }
}

class NewCanvas extends Canvas{
   int value1, value2;

   public void setvalue1(int val){
      value1 = val;
   }

   public void setvalue2(int val){
      value2 = val;
   }

   public void paint(Graphics g){
      double theta, x, y, oldx, oldy;
      oldx = 270.0; oldy = 150.0;
      g.setColor(Color.blue);
      for(theta = 0.0; theta < 40.0*Math.PI; theta += 2.0*Math.PI/360.0){
         x = 150.0+80.0*Math.cos(value1*theta)+40.0*Math.cos(value2*theta);
         y = 150.0+80.0*Math.sin(value1*theta)+40.0*Math.sin(value2*theta);
         g.drawLine((int)oldx,(int)oldy,(int)x,(int)y);     
         oldx = x;
         oldy = y;
      }
   }
}