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ABullet is an abstract class that can be extended so that the
subclass will draw bullets however the extender wishes.
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LSBullet is an extension of ABullet that implements
the drawing functions so that the bullet looks like a bullet from a
Light Storm toy dart gun.
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BulletTimer is an extension of EventTimer that is used
to animate an ABullet firing. It was implemented to draw an
LSBullet in particular.
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AClip is an abstract class that can be extended so that the
subclass will draw the clip however the extender wishes.
an AClip holds bullets of type ABullet.
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LSClip is an extension of AClip that implements the
drawing functions so that the clip looks like a clip from a
Light Storm toy dart gun. Notice that the arguments to the
methods, and the array of bullets that is inherited are of type
ABullet, even though the bullets put into the clip are probably of
type LSBullet. Since LSBullets are ABullets,
this is not a problem.
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AClipGun is an abstract class that can be extended so that the
subclass will draw the gun however the extender wishes.
An AClipGun accepts an AClip and fires bullets of
type ABullet.
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LSGun is an extension of AClipGun that implements the
drawing functions so that the gun looks like a
Light Storm toy dart gun. Notice that the arguments to the
methods (including the inherited methods)
and the inherited instance variables are of types
ABullet and AClip, even though the objects that will
be passed are of types LSBullet and LSCip.
Since an LSClip (LSBullet) is a AClip
(ABullet), there is no problem with this. It is important
to remember, however, if you need to pass an object of type
LSClip to insertClip, for instance, your reference
variable must be an AClip, not an LSClip, since the
argument type is AClip and not LSClip.
Again, since an LSClip is an AClip, a variable of
type Aclip can refer to an object of type LSClip
(But not the other way around).
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ATarget is a class that implements a target that can be hit by
ABullets. ATargets have various sizes, speeds, and values,
and their movement is accomplished by using the TargetTimer.
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TargetTimer is an extension of the EventTimer used to
move ATargets on the screen.
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ResetButton is an extension of AButton
that resets the TargetGame when pushed.
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GameTimer is an extension of EventTimer that is
used by GameTimer so each level has a time limit.
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TargetGame is a fun game which utilizes all of the classes
described here. It places an LSClip and LSGun on the
left side of the screen, and starts level 1. On level n,
n ATargets are placed starting from the right side of
the screen, and they start moving up and down, and slowly toward the left.
The player has 100-5n seconds to shoot all of the targets, and
wins if they complete level 20.
Each bullet fired deducts points from the score, and each target hit
adds points to the score.
For more details, play the game and find out the rest.
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