// Program: dc.java
// Purpose: This program implements a digital clock 
// Author : Chunyen Liu  
// Date   : 1999/03/10

import java.awt.*;
import java.applet.*;
import java.util.Date;

public class dc extends Applet implements Runnable 
   {
   Graphics og;
   Image oi;
   Thread t = null;
   int width, height, delay = 500;

   Date currTime;
   String time;
   int timewidth, timeheight, timedescent, timeH, timeM, timeS;

   public void init()
      {
      super.init();
      width = size().width;
      height = size().height;
      resize(width, height);

      // double buffering
      oi = createImage(width, height);
      og = oi.getGraphics();
      } 
 
   public void start()
      {
      if (t == null)
         {
         t = new Thread(this);
         t.start();
         }
      }

   public void stop()
      {
      t.stop();
      t = null;
      }
 
   public void run()
      {
      Thread.currentThread().setPriority(Thread.NORM_PRIORITY - 1);
      while (true)
         {
         repaint();
         try
            {
            Thread.sleep(delay);
            }
         catch (InterruptedException e) {}
         }
      }

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

   public void paint(Graphics g)
      {
      og.setColor(new Color(170, 170, 170));
      og.fillRect(0, 0, width, height);
      og.setFont(new Font("Helvetica", Font.BOLD, 15));
      og.setColor(new Color(20, 20, 20));
      currTime = new Date();
      timeH = currTime.getHours();
      timeM = currTime.getMinutes();
      timeS = currTime.getSeconds();

      time = "";
      if (timeH < 10) 
         time = "0" + timeH;
      else 
         time = "" + timeH;
      if (timeM < 10) 
         time += ":0" + timeM;
      else 
         time += ":" + timeM;
      if (timeS < 10) 
         time += ":0" + timeS;
      else 
         time += ":" + timeS;

      timewidth = (og.getFontMetrics()).stringWidth(time);
      timeheight = (og.getFontMetrics()).getHeight();
      timedescent = (og.getFontMetrics()).getDescent();
      og.drawString(time, (width - timewidth) / 2, height - 
         (height - timeheight) / 2 - timedescent); 
      og.setColor(new Color(230, 230, 230));
      og.drawString(time, (width - timewidth) / 2 - 1, height - 
         (height - timeheight) / 2 - timedescent - 1); 

      g.drawImage(oi, 0, 0, this);
      }
   }