sharkattack.java

java编程开发技巧与实例的编译测试通过的所有例程

import javax.swing.*;
import java.awt.event.*;
import java.applet.AudioClip;
import java.awt.MediaTracker;
import java.awt.Image;
import java.awt.Graphics;

public class SharkAttack extends JApplet implements Runnable
{
	private Shark			shark	=	null;
	private SharkPrey		prey[]	=	null;
	private SharkControls	guide	=	null;
	private SwanCounter		count	=	null;
	private class Arena extends JPanel
	{
		public void paintComponent(Graphics g)
		{
			super.paintComponent(g);
			g.drawImage(river, 0, 0, getSize().width, getSize().height, this);
			shark.paintComponent(g);
			for (int i = 0; i < prey.length; i ++)
				if (prey[i] != null)
					prey[i].paintComponent(g);
		}
	}
	private class Clicker extends MouseAdapter
	{
		public void mouseClicked(MouseEvent me)
		{
			guide.setVisible(true);
			guide.toFront();
		}
	}
	private	Image		river	=	null, aSwan		=	null;
	private AudioClip	music	=	null, splash	=	null;
	private Thread		thread	=	null;
	private	Arena		arena	=	new Arena();
	public void init()
	{
		river	=	getImage(getDocumentBase(), "Image/river.jpg");
		aSwan	=	getImage(getDocumentBase(), "Image/swan.gif");
		music	=	getAudioClip(getDocumentBase(), "Audio/jaws.wav");
		splash	=	getAudioClip(getDocumentBase(), "Audio/splash.wav");
		MediaTracker tracker	=	new MediaTracker(this);
		tracker.addImage(river, 0);
		tracker.addImage(aSwan, 1);
		try
		{
			tracker.waitForAll();
		}
		catch	(InterruptedException ie)
		{
			JOptionPane.showMessageDialog(this, "Error loading image");
		}
		shark	=	new Shark(this);
		prey	=	new SharkPrey[10];
		count	=	new SwanCounter(new ImageIcon(aSwan), prey.length);
		getContentPane().add("Center", new JPanelBox(arena, "Shark Attack"));
		getContentPane().add("South", count);
		guide	=	new SharkControls(this, shark);
		arena.setToolTipText("Click to show controls");
		arena.addMouseListener(new Clicker());
	}
	public void start()
	{
		thread	=	new Thread(this);
		count.reset();
		thread.start();
		music.loop();
		for	(int i = 0; i < prey.length; i ++)
			prey[i]	=	new SharkPrey(aSwan, this);
	}
	public void stop()
	{
		music.stop();
		count.stop();
		thread	=	null;
	}
	public void run()
	{
		Thread currentThread	=	Thread.currentThread();
		while	(thread == currentThread)
		{
			shark.move();
			for (int i = 0; i < prey.length; i ++)
				if (prey[i] != null)
					prey[i].move();
			try
			{
				thread.sleep(50);
			}
			catch	(InterruptedException ie)
			{
				System.err.println("Error: " + ie);
			}
			for (int i = 0; i < prey.length; i ++)
			{
				if ((prey[i] != null) && (prey[i].isEatenBy(shark)))
				{
					splash.play();
					prey[i]	=	null;
					count.remove();
					if (count.getCount() == 0)
						stop();
				}
			}
			arena.repaint();
		}
	}
}