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

import com.genuts.gameui.*;

/**
 * Display moving balls and a simple playfield with all tiles of the example. <br>
 * The size of each tile is automaticaly computed.
 */
public class PathFinder extends Applet {
  private PlayField playfield = null;

  public void init() {
    setLayout(null);

    // Loading images
    Image ballImage = getImage(getClass().getResource("anim-split.gif"));
    Image tileImage = getImage(getClass().getResource("tile.gif"));
    MediaTracker tracker = new MediaTracker(this);
    tracker.addImage(ballImage, 0);
    tracker.addImage(tileImage, 0);
    try {
      tracker.waitForID(0);
    } catch (InterruptedException e) {
      System.out.println("Loading interrupted");
    }

    // Gets the size of a tile
    Tiles.tileSize = tileImage.getWidth(null);

    // Creates the playfield
    SpriteCollisionManager collisionManager = new SpriteCollisionManager(10);
    playfield = new PlayField(collisionManager,
			      Tiles.tiles[0].length*Tiles.tileSize,
			      Tiles.tiles.length*Tiles.tileSize);
    playfield.setBackground(Color.white);

    // Disposes tiles from class Tiles
    for (int y = 0; y < Tiles.tiles.length; y++) {
      for (int x = 0; x < Tiles.tiles[y].length; x++) {
	if (Tiles.tiles[y][x]) {
	  Sprite tile = new Sprite(tileImage);
	  tile.setPosition(x*Tiles.tileSize, y*Tiles.tileSize);
	  playfield.addSprite(tile);
	}
      }
    }

    // Disposes 20 balls
    for (int cpt = 0; cpt < 20; cpt++) {
      AnimatedSprite anim = new AnimatedSprite(ballImage, 8, 1, 2);
      anim.setCurrentPictureNumber((int) (Math.random()*8));
      MovingBall moving = new MovingBall(anim, 1, 1);
      if ((int) (Math.random()*2) == 0) {
	moving.setClockWise(false);
      }
      playfield.addSprite(moving);
      while (!moving.setPosition((int) (Math.random()*playfield.getPreferredWidth()), 
				 (int) (Math.random()*playfield.getPreferredHeight())));
    }

    // Displays the playfield
    add(playfield);
  }

  public void start() {
    // Activate the playfield
    playfield.setPause(false);
  }

  public void stop() {
    if (playfield != null) {
      playfield.stop();
    }
  }
}