// File $CISC370HOME/example-progs/threads/animation/ThermApplet.java

/********************************************************************
 * This is an applet that creates a thermometer.  It then
 * creates two canvases, attaching each
 * as observers to the single thermometer.  This is
 * example of having two observers of a single object. The
 * canvases are attached to the east and west parts of the applet panel.
 * Then the temperature on the thermometer is changed in a for-loop
 * with appropriate changes to the thermometer title.  This is a test
 * of the setters in the class Thermometer and of some simple
 * animation.
 ********************************************************************/
 
import java.applet.*;
import java.awt.*;
import java.lang.Thread;
import javax.swing.*;
 
public class ThermApplet extends JApplet implements Runnable
{
/********************************************************************
 * Instance variables
 ********************************************************************/

 // Create thermometer to display
 Thermometer T = new Thermometer("Thermometer Demo",0,100,33);

 ThermoCanvas thermoCanvas1 = new ThermoCanvas( T );// Create canvas
 ThermoCanvas thermoCanvas2 = new ThermoCanvas( T );// observers

/********************************************************************
 * Instance methods for applet
 ********************************************************************/

 public void init()		// The init method for the Applet
 {
  System.out.println("Enter ThermApplet: init()");
  Container cp = getContentPane();
  cp.setLayout(new BorderLayout());
  cp.add("West", thermoCanvas1); // Attach 1st thermo canvas to applet panel
  cp.add("East", thermoCanvas2); // Attach 2nd thermo canvas to applet panel
 }

 public void start(){		// The start method for Applet
   System.out.println("Enter ThermApplet: start()");
   if (animatorThread == null) {
       animatorThread = new Thread(this);// For 1st call to Applet.start()
       animatorThread.start();		 // Creates system resources for
   }					 // the thread & schedules it to run
   else
       animatorThread.resume();		 // For 2nd & subsequent calls
 }					 // to Applet.start(). Return thread
					 // to runnable state.
 public void stop()		// The stop method for the Applet
 {
   System.out.println("Enter ThermApplet: stop()");
   if (animatorThread != null && animatorThread.isAlive())
     animatorThread.suspend();	// Put thread in not runnable state
 }

/********************************************************************
 * Set up thread for animation
 ********************************************************************/
 private Thread animatorThread = null;	// Another instance variable

 // Required to implement Runnable.  Called by Thread.start()
 public void run(){		
    System.out.println("Enter ThermApplet: run()");
    for (int i = 91; i >= 0; i--) {
        System.out.println("ThermApplet.run():i = " + i);
        try{ 
            Thread.sleep(50); 	// A static method that effects the
        }
        catch(InterruptedException e){	// currently running thread.
            System.out.println(e);
            System.exit(1);
        }
        T.setTemp(i);
        switch (i) {
           case 10:  T.setTitle("Baby, its cold outside!");
                     break;
           case 32:  T.setTitle("It's a cool day.");
                     break;
           case 65:  T.setTitle("It's a nice day.");
                     break;
           case 80:  T.setTitle("It's cooling off!");
                     break;
           case 90:  T.setTitle("Boy, it's sweltering!");
                     break;
           default:
        }
    }
 }	// Thread dies a natural death on termination of the loop
}