/* 
  <applet code="Rink.class" width=300 height=300>
    <param name="columns" value= "10">
    <param name="rows"    value= "10">
    <param name="penguin" value="yes">
    <param name="pengo_x" value=  "1">
    <param name="pengo_y" value=  "7">
  </applet> 
*/ 

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

public class Rink extends NoFlickerApplet implements KeyListener {
    int columns, rows; 
    Thread animation; 
    Image small[]; 
    int cellWidth = 30, cellHeight = 30; 
    public Rink() { } 
    public Rink (int columns, int rows) { 

	this.columns = columns; 
	this.rows = rows; 

    }
    int wide, tall; 
    public void init() {
	if (columns == 0) 
	    this.columns = Integer.parseInt(this.getParameter("columns"));
	if (rows == 0) 
	    this.rows = Integer.parseInt(this.getParameter("rows"));
	this.wide = columns * cellWidth + cellWidth / 2; 
	this.tall = (1 + rows) * cellHeight + cellHeight / 2; 
	this.setSize(this.wide, this.tall); 
	String pictureURL = "http://www.cs.indiana.edu/classes/a348/CT" + 
	                    "ED/moduleFour/lectures/iceblox/iceblox.gif";
	MediaTracker tracker = new MediaTracker(this); 
        Image collection; 
	try {
	    collection = 
		Toolkit.getDefaultToolkit().getImage(new URL(pictureURL));

	} catch (Exception e) {
	    collection = Toolkit.getDefaultToolkit().getImage("iceblox.gif"); 
	}
	tracker.addImage(collection, 0); 
	try {
	    tracker.waitForID(0); 
	} catch (InterruptedException e) { }
	ImageProducer collectionProducer = collection.getSource(); 
	int smalls = 48; 
	small = new Image[smalls]; 
	int k = 0, i = 0, j = 0; 
	ImageFilter filter; 
	while (k < smalls) {
	    filter = new CropImageFilter(j * 30, i * 30, 30, 30); 
	    small[k] = createImage(
                         new FilteredImageSource(
                           collectionProducer, filter)); 
	    tracker.addImage(small[k], 1); 
	    k++; j++;
	    if (j == 8) {
		j = 0; i++; 
	    }
	}
	try {
	    tracker.waitForID(1); 
	} catch (InterruptedException e) { }
	if (this.getParameter("penguin").equals("yes")) {
	    this.add(new Penguin(), 
		     Integer.parseInt(this.getParameter("pengo_x")),
		     Integer.parseInt(this.getParameter("pengo_y")));  
	} 
	this.addKeyListener(this); 
    }
    int fontSize = 10; // in pixels 
    Font digitsFont = new Font("Serif", Font.PLAIN, fontSize); 
    Penguin skater; 
    void add(Penguin p, int x, int y) {
	this.skater = p; 
	p.placeIn(this, x, y); 
	skater.start();
    }
    public void paint(Graphics g) {
	((Graphics2D)g).setFont(digitsFont); 
	g.setColor(Color.black); 
	g.fillRect(0, 0, columns * cellWidth, rows * cellHeight); 
	g.setColor(Color.gray); 
	for (int i = 0; i <= rows; i++) {
	    g.drawLine(0, i * cellHeight, columns * cellWidth, i * cellHeight);
	}
	for (int i = 0; i <= columns; i++) {
	    g.drawLine(i * cellWidth, 0, i * cellWidth, rows * cellHeight); 
	}
	g.drawRect(0, 0, cellWidth * columns, cellHeight * rows); 
	for (int j = 0; j < columns; j = j + 1) 
	    for (int i = 0; i < rows; i++) 
		g.drawString(i + ", " + j, 
			     j * cellWidth + 2, i * cellHeight + fontSize);
	if (skater != null) {
	    int x = skater.x, 
		y = skater.y;
	    g.setColor(Color.black); 
	    g.fillRect(x, y, 31, 31); 
	    skater.draw(g); 
	}
    }
    public void keyPressed(KeyEvent e) { 
	switch(e.getKeyCode()) {
	case KeyEvent.VK_L: // left
	    // System.out.println("left"); 
            skater.action.put("turnLeft"); 
	    break; 
	case KeyEvent.VK_F: // forward
	    // System.out.println("forward"); 
            skater.action.put("moveForward"); 
	    break; 
	case KeyEvent.VK_R: // right 
	    // System.out.println("right"); 
            skater.action.put("turnRight"); 
	    break; 
	case KeyEvent.VK_B: // backwards 
	    // System.out.println("back"); 
	    skater.action.put("backwards"); 
	    break; 
	}
    }
    public void keyReleased(KeyEvent e) { } 
    public void keyTyped(KeyEvent e) { } 
}