/**
 * @version 1.20 1999-04-27
 * @author Cay Horstmann
 */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class TimerTest
{  public static void main(String[] args)
   {  JFrame f = new TimerTestFrame();
      f.show();
   }
}

class TimerTestFrame extends JFrame
{  public TimerTestFrame()
   {  setSize(450, 300);
      setTitle("TimerTest");

      addWindowListener(new WindowAdapter()
         {  public void windowClosing(WindowEvent e)
            {  System.exit(0);
            }
         } );

      Container c = getContentPane();
      c.setLayout(new GridLayout(2, 3));
      c.add(new ClockCanvas("San Jose", "GMT-8"));
      c.add(new ClockCanvas("Taipei", "GMT+8"));
      c.add(new ClockCanvas("Berlin", "GMT+1"));
      c.add(new ClockCanvas("New York", "GMT-5"));
      c.add(new ClockCanvas("Cairo", "GMT+2"));
      c.add(new ClockCanvas("Bombay", "GMT+5"));
   }
}

interface TimerListener
{  void timeElapsed(Timer t);
}

class Timer extends Thread
{  public Timer(int i, TimerListener t)
   {  target  = t;
      interval = i;
      setDaemon(true);
   }

   public void run()
   {  try
      {  while (!interrupted())
         {  sleep(interval);
            target.timeElapsed(this);
         }
      }
      catch(InterruptedException e) {}
   }

   private TimerListener target;
   private int interval;
}

class ClockCanvas extends JPanel
   implements TimerListener
{  public ClockCanvas(String c, String tz)
   {  city = c;
      calendar = new GregorianCalendar(TimeZone.getTimeZone(tz));
      Timer t = new Timer(1000, this);
      t.start();
      setSize(125, 125);
   }

   public void paintComponent(Graphics g)
   {  super.paintComponent(g);
      g.drawOval(0, 0, 100, 100);
      double hourAngle = 2 * Math.PI
         * (seconds - 3 * 60 * 60) / (12 * 60 * 60);
      double minuteAngle = 2 * Math.PI
         * (seconds - 15 * 60) / (60 * 60);
      double secondAngle = 2 * Math.PI
         * (seconds - 15) / 60;
      g.drawLine(50, 50, 50 + (int)(30
         * Math.cos(hourAngle)),
         50 + (int)(30 * Math.sin(hourAngle)));
      g.drawLine(50, 50, 50 + (int)(40
         * Math.cos(minuteAngle)),
         50 + (int)(40 * Math.sin(minuteAngle)));
      g.drawLine(50, 50, 50 + (int)(45
         * Math.cos(secondAngle)),
         50 + (int)(45 * Math.sin(secondAngle)));
      g.drawString(city, 0, 115);
   }

   public void timeElapsed(Timer t)
   {  calendar.setTime(new Date());
      seconds = calendar.get(Calendar.HOUR) * 60 * 60
         + calendar.get(Calendar.MINUTE) * 60
         + calendar.get(Calendar.SECOND);
      repaint();
   }

   private int seconds = 0;
   private String city;
   private int offset;
   private GregorianCalendar calendar;

   private final int LOCAL = 16;
}