//Kite2.java
//Add Thread and motion
//Andy Harris, 06/00

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class Kite2 extends Applet implements Runnable {

  public static final int NORTH = 0;
  public static final int NORTHEAST = 1;
  public static final int EAST = 2;
  public static final int SOUTHEAST = 3;
  public static final int SOUTH = 4;
  public static final int SOUTHWEST = 5;
  public static final int WEST = 6;
  public static final int NORTHWEST = 7;
  
  Image kite[] = new Image[8];
  int direction = NORTH;
  int dx = 0;
  int dy = 0;
  int x = 0;
  int y = 0;
  
  EventHandler evt = new EventHandler();
  Thread looper;
  boolean keepGoing = true;

  public void init(){
    //get the kite images
    kite[NORTH] = getImage (getDocumentBase(), "kiteN.gif");
    kite[NORTHEAST] = getImage (getDocumentBase(), "kiteNE.gif");
    kite[EAST] = getImage (getDocumentBase(), "kiteE.gif");
    kite[SOUTHEAST] = getImage (getDocumentBase(), "kiteSE.gif");
    kite[SOUTH] = getImage (getDocumentBase(), "kiteS.gif");
    kite[SOUTHWEST] = getImage (getDocumentBase(), "kiteSW.gif");
    kite[WEST] = getImage (getDocumentBase(), "kiteW.gif");
    kite[NORTHWEST] = getImage (getDocumentBase(), "kiteNW.gif");

    this.setBackground(new Color(232, 232, 255));
    this.addKeyListener(evt);
    this.requestFocus();
  } // end init
    
  public void start(){
    if (looper == null){
      looper = new Thread(this);
      keepGoing = true;
      looper.start();
    } // end if
  } // end start

  public void stop(){
    keepGoing = false;
    looper = null;
  } // end stop

  public void run(){

    while (keepGoing){
      try {
	looper.sleep(100);
      } catch (InterruptedException exc){
	System.out.println(exc.getMessage());
      } // end try

      switch (direction){
	case NORTH:
	  dx = 0;
	  dy = -10;
	  break;
	case NORTHEAST:
	  dx = 7;
	  dy = -7;
	  break;
	case EAST:
	  dx = 10;
	  dy = 0;
	  break;
	case SOUTHEAST:
	  dx = 7;
	  dy = 7;
	  break;
	case SOUTH:
	  dx = 0;
	  dy = 10;
	  break;
	case SOUTHWEST:
	  dx = -7;
	  dy = 7;
	  break;
	case WEST:
	  dx = -10;
	  dy = 0;
	  break;
	case NORTHWEST:
	  dx = -7;
	  dy = -7;
	  break;
      } // end switch

      x += dx;
      
      if (x < 0){
	x = 0;
      } // end if

      int appWidth = this.getSize().width;
      appWidth -= (kite[direction].getWidth(this)/4);
      
      if (x > appWidth){
	x = appWidth;
      } // end if
      
      y += dy;

      if (y < 0){
	y = 0;
      } // end if

      int appHeight = this.getSize().height;
      appHeight -= (kite[direction].getHeight(this)/4);
      
      if (y > appHeight){
	y = appHeight;
      } // end if
      
      repaint();
    }  // end while
  } // end run
	  
      

  public void paint(Graphics g){
    g.drawImage(kite[direction], x, y, 25, 25, this);
  } // end paint

  private class EventHandler extends KeyAdapter {
    public void keyPressed(KeyEvent e){

      if (e.getKeyCode() == KeyEvent.VK_LEFT){
	direction--;
	if (direction < NORTH) {
	  direction = NORTHWEST;
	} // end if
      } else if (e.getKeyCode() == KeyEvent.VK_RIGHT){
	direction++;
	if (direction > NORTHWEST){
	  direction = NORTH;
	} // end if
      } // end key checking if

      
    } // end key press event
  } // end eventHandler class def

} // end kite class def