fallingstars.java

JAVA游戏程序-例,JAVA的消息机制与简单的用户交互程序

import java.applet.*;
import java.awt.*;
import java.io.PrintStream;
import java.net.MalformedURLException;
import java.net.URL;

public class FallingStars extends Applet
    implements Runnable
{

    Thread runner;
    MediaTracker tracker;
    Image star;
    int starX[];
    int starY[];
    int starSize[];
    int starXAdd[];
    int starYAdd[];
    int maxStars;
    int numberOffStars;
    int numberOffShips;
    int hiscore[];
    int score;
    int level;
    boolean exploding;
    int tempInt;
    int tempInt2;
    AudioClip explosion;
    AudioClip shipExploding;
    AudioClip alert;
    AudioClip laser;
    Image offscreenI;
    Graphics offscreenG;
    Image ship;
    int shipX;
    Image shipexplode;
    boolean shiphit;
    boolean started;
    boolean starting;
    String startString;
    Font f;
    FontMetrics fm;
    String introText1;
    String introText2;
    String introText3;
    String introText4;
    String introText5;
    String introText6;
    String introText7;
    String introText8;
    String introText9;
    String introText10;
    String introText11;
    String introText12;
    String introText13;
    String introText14;
    String introText15;
    String introText16;
    String introText17;
    String levelText1;
    String levelText2;
    String levelText3;
    String levelText4;
    String levelText5;
    String levelText6;
    int introY;
    Font f2;
    FontMetrics fm2;
    Font f3;
    FontMetrics fm3;
    boolean firing;
    boolean sound;
    String marker;
    Object frame;
    int mouseX;
    int mouseY;
    boolean mouseMoved;
    boolean choice;
    String marker2;
    boolean clicked;
    boolean drawScoreBoard;
    boolean ended;
    URL url;
    int flicker;

    public void init()
    {
        tracker = new MediaTracker(this);
        f = new Font("TimesRoman", 1, 36);
        fm = getFontMetrics(f);
        f2 = new Font("TimesRoman", 2, 18);
        fm2 = getFontMetrics(f2);
        f3 = new Font("TimesRoman", 1, 20);
        fm3 = getFontMetrics(f3);
        System.out.println("Falling stars by RJHM van den Bergh (c)1996");
        System.out.println("From : Java applet download site , http://www.nedernet.nl/~rvdb\nrvdb@nedernet.n" +
"l"
);
        laser = getAudioClip(getCodeBase(), "laser.au");
        laser.play();
        explosion = getAudioClip(getCodeBase(), "explosion.au");
        explosion.play();
        pause(2000);
        shipExploding = getAudioClip(getCodeBase(), "shipexplode.au");
        shipExploding.play();
        alert = getAudioClip(getCodeBase(), "alert.au");
        alert.loop();
        star = getImage(getCodeBase(), "star.gif");
        ship = getImage(getCodeBase(), "ship.gif");
        shipexplode = getImage(getCodeBase(), "shipexplode.gif");
        tracker.addImage(star, 0);
        tracker.addImage(ship, 0);
        tracker.addImage(shipexplode, 0);
        getAppletContext().showStatus("loading the pictures");
        try
        {
            tracker.waitForID(0);
        }
        catch(InterruptedException _ex)
        {
            return;
        }
        starX = new int[maxStars + 1];
        starY = new int[maxStars + 1];
        starSize = new int[maxStars + 1];
        starXAdd = new int[maxStars + 1];
        starYAdd = new int[maxStars + 1];
        for(tempInt = 1; tempInt <= numberOffStars; tempInt++)
        {
            replaceStar(tempInt);
            starSize[tempInt] = 1;
        }

        while(marker != "nhgube EWUZ" || marker2 != "ina qra Oretu") ;
        shipX = (size().width - ship.getWidth(this)) / 2;
        offscreenI = createImage(size().width, size().height);
        offscreenG = offscreenI.getGraphics();
        offscreenG.setColor(Color.black);
        offscreenG.fillRect(0, 0, size().width, size().height);
        introY = size().height + 10;
        for(frame = this; frame != null && !(frame instanceof Frame); frame = ((Component)frame).getParent()) { }
        try
        {
            url = new URL("http://www.nedernet.nl/~rvdb");
            return;
        }
        catch(MalformedURLException _ex)
        {
            System.out.println("Bad Url = " + url);
        }
    }

    public boolean keyDown(Event event, int i)
    {
        switch(i)
        {
        case 1006: 
            shipX -= 7;
            if(shipX - ship.getWidth(this) / 2 < 5)
            {
                shipX = ship.getWidth(this) / 2 + 5;
            }
            repaint();
            return true;

        case 1007: 
            shipX += 7;
            if(shipX + ship.getWidth(this) / 2 > size().width - 5)
            {
                shipX = size().width - ship.getWidth(this) / 2 - 5;
            }
            repaint();
            return true;

        case 32: // ' '
            firing = true;
            laser.play();
            hitCheck();
            return true;

        case 1004: 
            firing = true;
            laser.play();
            hitCheck();
            return true;

        case 83: // 'S'
            if(sound)
            {
                alert.stop();
                sound = false;
            } else
            {
                alert.play();
                sound = true;
            }
            return true;

        case 115: // 's'
            if(sound)
            {
                alert.stop();
                sound = false;
            } else
            {
                alert.loop();
                sound = true;
            }
            return true;

        case 27: // '\033'
            shiphit = true;
            numberOffShips = 0;
            return true;
        }
        return false;
    }

    public void mouseMove()
    {
        shipX = mouseX;
        ((Frame)frame).setCursor(1);
        mouseMoved = false;
        if(shipX + ship.getWidth(this) / 2 > size().width - 5)
        {
            shipX = size().width - ship.getWidth(this) / 2 - 5;
        }
        if(shipX - ship.getWidth(this) / 2 < 5)
        {
            shipX = ship.getWidth(this) / 2 + 5;
        }
        repaint();
    }

    public boolean handleEvent(Event event)
    {
        switch(event.id)
        {
        case 503: // Event.MOUSE_MOVE
            mouseMoved = true;
            mouseX = event.x;
            mouseY = event.y;
            return true;

        case 501: // Event.MOUSE_DOWN
            if(started)
            {
                firing = true;
                laser.play();
                hitCheck();
            } else
            {
                if(starting)
                {
                    choice = true;
                }
                starting = true;
            }
            clicked = true;
            return true;

        case 502: // Event.MOUSE_UP
        default:
            return super.handleEvent(event);
        }
    }

    public void start()
    {
        if(runner == null)
        {
            runner = new Thread(this);
            runner.start();
        }
    }

    public void stop()
    {
        if(runner != null)
        {
            if(sound)
            {
                alert.stop();
            }
            runner.stop();
            runner = null;
        }
    }

    public void destroy()
    {
        explosion.stop();
        alert.stop();
        runner = null;
        System.gc();
        super.destroy();
    }

    public void run()
    {
        while(Thread.currentThread() == runner) 
        {
            if(started)
            {