//Kite7.java
//Make array of balloons
//Andy Harris, 06/00

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

public class Kite7 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
  Bloon balloon[] = new Bloon[5];  
  int bCounter = 0;
  
  //sounds
  AudioClip sndPop;
  
  EventHandler evt = new EventHandler();
  Thread looper;
  boolean keepGoing = true;
  int score = 0;
  
  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");

    //Initialize the balloons
    for (bCounter = 0; bCounter < 5; bCounter++){
      balloon[bCounter] = new Bloon(getImage(
			     getDocumentBase(), "balloonRed.gif"));
    } // end for loop

    //get the audio
    sndPop = getAudioClip(getDocumentBase(), "pop.au");
    
    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;
    
    for (bCounter = 0; bCounter < 5; bCounter++){
      Bloon b = balloon[bCounter];
      
      //incorporate margin
      int bLeft = b.x - b.margin;
      int bRight = b.x + b.width + b.margin;
      int bTop = b.y - b.margin;
      int bBottom = b.y + b.height + b.margin;
  
      if(kLeft > bLeft){
        if (kRight < bRight){
    	  if (kTop > bTop){
    	    if (kBottom < bBottom ){
  	      sndPop.play();
              score += kTop;
  	      //reset balloon
              b.x = (int)(Math.random() * getSize().width);
              b.y = getSize().height - b.height;
  	    } // end if
  	  } // end if
        } // end if
      } // end if
    } // end for loop
  } // end checkCollision

  public void moveBalloon(){
    for (bCounter = 0; bCounter < 5; bCounter++){

      Bloon b = balloon[bCounter];
      b.y -= 2;
      if (b.y < 0){
        b.x = (int)(Math.random() * getSize().width);
        b.y = getSize().height - b.height;
      } else {
        //move it a little bit in X direction
        b.x = (int)(Math.random() * 5) - 3 + b.x;
        if (b.x < b.width){
   	  b.x = 15;
        } else if (b.x >this.getSize().width){
  	  b.x = this.getSize().width - b.width;
        } // end 'bound checking' if
  
      } // end 'off top of screen' if
    } // end for loop
  } // end moveBalloon
  
  public void paint(Graphics g){
    for (bCounter = 0; bCounter < 5; bCounter++){
      Bloon b = balloon[bCounter];
      g.drawImage(kite[direction], x, y, wd, ht, this);
      g.drawImage(b.image, b.x, b.y, b.width, b.height, this);
      g.drawString(String.valueOf(score), 10, 10);
    } // end for loop
  } // 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

  private class Bloon {
    int x = 100;
    int y = 100;
    int width = 15;
    int height = 25;
    int margin = 10;
    Image image;

    public Bloon(Image img){
      image = img;
    } // end constructor

  } // end balloon class def
  

} // end kite class def