/*********************************************
 * Applet that demonstrates some basic animation
 * techniques.
 ********************************************/

import java.awt.*;
import java.util.Calendar;

public class DigitalClock
  extends java.applet.Applet implements Runnable {

  // the thread that will handle the redrawing ie the "ticking"
  protected Thread clockThread = null;
  // the font for the clock
  protected Font font = new Font("Monospaced", Font.BOLD, 48);
  // the color for the clock
  protected Color color = Color.green;

  // until we discuss Java threading, please use this 
  // as a guide on how to start your animation thread
  public void start() {
    if (clockThread == null) {
      clockThread = new Thread(this);
      clockThread.start();
    }
  }

  // stops the clock from "ticking" or redrawing
  public void stop() {
    clockThread = null;
  }

  // this is what you tell the thread to do
  // all it does is call the repaint method
  // and then go to sleep for 1000 miliseconds (1 second)
  // again use this as an example on how to do animation
  public void run() {
    while (Thread.currentThread()  ==  clockThread) {
      repaint();
        try {
          Thread.currentThread().sleep(1000);
        } catch (InterruptedException e) {}
    }
  }

  // where most of the work is done.
  // responsible for repainting the applet area
  public void paint(Graphics g) {
    // the calendar is used to get the current time
    Calendar calendar = Calendar.getInstance();
    int hour = calendar.get(Calendar.HOUR_OF_DAY);
    int minute = calendar.get(Calendar.MINUTE);
    int second = calendar.get(Calendar.SECOND);
    g.setFont(font);
    g.setColor(color);
    // the draw string method takes the string to draw and the 
    // x and y coordinates of where to put it.
    // remember that x,y is the lower left corner of the string.
    
    // the division and modulo operators are to get the time to 
    // be in the form hh:mm:ss.  If we didn't do the division
    // we wouldn't have the 2 digit minutes and seconds.
    g.drawString(hour + ":" + minute / 10 + minute % 10 +
                        ":" + second / 10 + second % 10, 10, 60);
  }
}