//Kite4.java
//Move the balloon
//Andy Harris, 06/00

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

public class Kite4 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;
  int wd = 25;
  int ht = 25;

  //balloon values
  Image balloon;
  int bX = 200;
  int bY = 200;
  int bWd = 15;
  int bHt = 25;
  int margin = 10;
  
  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");

    //get the balloon image
    balloon = getImage (getDocumentBase(), "balloonRed.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

      checkDirection();
      upDateKite();
      checkCollision();
      moveBalloon();
      repaint();

    } // end while
  } // end run

  public void checkDirection(){      
    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
  } // end checkDirection

  public void upDateKite(){
    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
  
  } // end upDateKite();
	  
  public void checkCollision(){
    int kLeft = x;
    int kRight = x + wd;
    int kTop = y;
    int kBottom = y + ht;

    //incorporate margin
    int bLeft = bX - margin;
    int bRight = bX + bWd + margin;
    int bTop = bY- margin;
    int bBottom = bY + bHt + margin;

    if(kLeft > bLeft){
      if (kRight < bRight){
	if (kTop > bTop){
	  if (kBottom < bBottom ){
	    System.out.println("Hit!!!!!");
	  } // end if
	} // end if
      } // end if
    } // end if

  } // end checkCollision

  public void moveBalloon(){
    bY -= 2;
    if (bY < 0){
      bX = (int)(Math.random() * getSize().width);
      bY = getSize().height - bHt;
    } // end if
  } // end moveBalloon
  
  public void paint(Graphics g){
    g.drawImage(kite[direction], x, y, wd, ht, this);
    g.drawImage(balloon, bX, bY, bWd, bHt, 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