Class NightHunter 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----NightHunter
public class NightHunter
extends Applet
implements Runnable
This is the main class that is instantiated to begin the "Night Hunter" Java game. This class handles high-level animation, game timing loop, sound issues, and user input.

Variable Index

o animate
o applause
o back
o clip
o delay
Animation frame rate = 12 FPS
o gun
Mouse/Gun image
o gunImage
o gunsound
o infoFont
o infoMetrics
o killed
o level
o lost
o music
o musicOn
o offGrfx
o offImage
o rand
o srv
o tracker

Constructor Index

o NightHunter()

Method Index

o getAppletInfo()
o init()
Game initialization method - starts the MediaTracker (needed to make sure images are completely loaded), load game background the mouse - gun images, and load audio clips.
o keyDown(Event, int)
Keyboard keyDown Event - check for user input for new game or toggle music on/off.
o mouseDown(Event, int, int)
Mouse Down Event - check if mouse/gun is over sprite, if it is kill sprite.
o mouseEnter(Event, int, int)
Mouse Enter Event - when mouse enters game frame show gun crosshairs.
o mouseExit(Event, int, int)
Mouse Exit Event - when mouse exits game frame hide gun crosshairs.
o mouseMove(Event, int, int)
Mouse Move Event - update gun crosshair position.
o newGame()
Setup a new game.
o paint(Graphics)
Paint method that uses the Media Tracker to insure images are loaded.
o run()
When an object is derived from a "Runnable" class then this method is called right after the thread "start()" method completes.
o start()
Standard thread start handler method
o stop()
Standard thread termination handler method - *** added call to stop music when thread terminates
o update(Graphics)
This image update method uses "double-buffering" for bitmap images to eliminate screen flicker.

Variables

o offImage 
 private Image offImage
o back 
 private Image back
o gunImage 
 private Image gunImage
o music 
 private AudioClip music
o gunsound 
 private AudioClip gunsound
o applause 
 private AudioClip applause
o clip 
 private AudioClip clip[]
o offGrfx 
 private Graphics offGrfx
o animate 
 private Thread animate
o tracker 
 private MediaTracker tracker
o srv 
 private SRVector srv
o gun 
 private Sprite gun
Mouse/Gun image

o delay 
 private int delay
Animation frame rate = 12 FPS

o infoFont 
 private Font infoFont
o infoMetrics 
 private FontMetrics infoMetrics
o rand 
 private Random rand
o musicOn 
 private boolean musicOn
o level 
 private static int level
o killed 
 private static int killed
o lost 
 public static int lost

Constructors

o NightHunter 
 public NightHunter()

Methods

o getAppletInfo 
 public String getAppletInfo()
Overrides:
getAppletInfo in class Applet
o init 
 public void init()
Game initialization method - starts the MediaTracker (needed to make sure images are completely loaded), load game background the mouse - gun images, and load audio clips.

Overrides:
init in class Applet
o start 
 public void start()
Standard thread start handler method

Overrides:
start in class Applet
o stop 
 public void stop()
Standard thread termination handler method - *** added call to stop music when thread terminates

Overrides:
stop in class Applet
o run 
 public void run()
When an object is derived from a "Runnable" class then this method is called right after the thread "start()" method completes. *** This method is the heart of the game because this is where a new game is set up and this is where the game timing loop is implemented.

o update 
 public void update(Graphics g)
This image update method uses "double-buffering" for bitmap images to eliminate screen flicker. Draw the screen image as well as game info (level etc.). If game is over display "Game Over" message and stop music. *** This is where new creatures get added randomly depending on game level.

Overrides:
update in class Container
o paint 
 public void paint(Graphics g)
Paint method that uses the Media Tracker to insure images are loaded. If images are not completely loaded then a message will be displayed to the user until the image is loaded.

Overrides:
paint in class Container
o mouseEnter 
 public boolean mouseEnter(Event evt,
                           int x,
                           int y)
Mouse Enter Event - when mouse enters game frame show gun crosshairs.

Overrides:
mouseEnter in class Component
o mouseExit 
 public boolean mouseExit(Event evt,
                          int x,
                          int y)
Mouse Exit Event - when mouse exits game frame hide gun crosshairs.

Overrides:
mouseExit in class Component
o mouseMove 
 public boolean mouseMove(Event evt,
                          int x,
                          int y)
Mouse Move Event - update gun crosshair position.

Overrides:
mouseMove in class Component
o mouseDown 
 public boolean mouseDown(Event evt,
                          int x,
                          int y)
Mouse Down Event - check if mouse/gun is over sprite, if it is kill sprite. Play gun sound and sprite death sound if hit.

Overrides:
mouseDown in class Component
o keyDown 
 public boolean keyDown(Event evt,
                        int key)
Keyboard keyDown Event - check for user input for new game or toggle music on/off.

Overrides:
keyDown in class Component
o newGame 
 void newGame()
Setup a new game.