// Program: ac.java
// Purpose: This program implements an analog clock 
// Author : Chunyen Liu  
// Date   : 1999/03/10

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

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

   Date currTime;
   int timeH, timeM, timeS, radius = 50, lenH, lenM, lenS, 
      lenIn, cx, cy, x1, y1, x2, y2;

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

      lenH = 5 * radius / 10;
      lenM = 6 * radius / 10;
      lenS = 7 * radius / 10;
      lenIn = 8 * radius / 10;
      cx = width / 2;
      cy = height / 2;

      // 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);
      currTime = new Date();
      timeH = currTime.getHours();
      timeM = currTime.getMinutes();
      timeS = currTime.getSeconds();

      if (timeH >= 12)
         timeH -= 12;

      for (int i = 1; i < 13; i++)
         {
         og.setColor(new Color(20, 20, 20));
         x2 = (int)(cx + radius * Math.sin(i * 2 * 3.14159f / 12));
         y2 = (int)(cy - radius * Math.cos(i * 2 * 3.14159f / 12));
         if (i % 3 != 0)
            {
            x1 = (int)(cx + 0.9f * radius * Math.sin(i * 2 * 3.14159f / 12));
            y1 = (int)(cy - 0.9f * radius * Math.cos(i * 2 * 3.14159f / 12));
            }
         else
            {
            x1 = (int)(cx + 0.8f * radius * Math.sin(i * 2 * 3.14159f / 12));
            y1 = (int)(cy - 0.8f * radius * Math.cos(i * 2 * 3.14159f / 12));
            }
         og.drawLine(x1, y1, x2, y2);
         og.setColor(new Color(230, 230, 230));
         og.drawLine(x1 - 1, y1 - 1, x2 - 1, y2 - 1);
         }
      
      og.setColor(new Color(20, 20, 20));
      x2 = (int)(cx + lenH * Math.sin((timeH + timeM / 60.0f + timeS / 3600.0f)
         * 2 * 3.14159f / 12));
      y2 = (int)(cy - lenH * Math.cos((timeH + timeM / 60.0f + timeS / 3600.0f)
         * 2 * 3.14159f / 12));
      og.drawLine(cx, cy, x2, y2);
      og.setColor(Color.red);
      og.drawLine(cx - 1, cy - 1, x2 - 1, y2 - 1);

      og.setColor(new Color(20, 20, 20));
      x2 = (int)(cx + lenM * Math.sin((timeM + timeS / 60.0f) * 2 * 3.14159f 
         / 60));
      y2 = (int)(cy - lenM * Math.cos((timeM + timeS / 60.0f) * 2 * 3.14159f 
         / 60));
      og.drawLine(cx, cy, x2, y2);
      og.setColor(Color.green);
      og.drawLine(cx - 1, cy - 1, x2 - 1, y2 - 1);

      og.setColor(new Color(20, 20, 20));
      x2 = (int)(cx + lenS * Math.sin(timeS * 2 * 3.14159f / 60));
      y2 = (int)(cy - lenS * Math.cos(timeS * 2 * 3.14159f / 60));
      og.drawLine(cx, cy, x2, y2);
      og.setColor(Color.blue);
      og.drawLine(cx - 1, cy - 1, x2 - 1, y2 - 1);

      og.setColor(new Color(20, 20, 20));
      og.drawOval((width - 2 * radius) / 2, (height - 2 * radius) / 2,
         2 * radius, 2 * radius); 
      og.setColor(new Color(230, 230, 230));
      og.drawOval((width - 2 * radius) / 2 - 1, (height - 2 * radius) / 2 - 1,
         2 * radius, 2 * radius); 
      
      g.drawImage(oi, 0, 0, this);
      }
   }