[JAVA][Beginning Java 8 Games Development]

Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine
You will need to remember to add the Treasure objects to the castDirector object, as seen in Figure 17-17,
because the collision detection engine uses this CastingDirector class (object) to manage a collision detection
process. If you do not do this step, the InvinciBagel will go right over the Treasure objects without seeing
(colliding with) them!
Figure 17-17. Add iTR0 and iTR1 Treasure objects inside the .addCurrentCast(Actor. . .) method call
Now that we have added these two Treasure objects to the castDirector CastingDirector object, the collision
detection programming logic will “see” them, and collisions with the Treasure objects will occur, triggering the scoring
engine to score the game correctly. Test the final code for implementing Treasure in your game, and make sure that it
works, and then we can move on to adding adversaries and have them shoot projectiles at the InvinciBagel character.
Adding Enemies: The Enemy and Projectile Classes
Now that we have added positive (Treasure) elements to our game, let’s add some negative (Enemy and Projectile)
elements to the game, so that we remain “balanced” in our development work process. We are going to use the Actor
superclass, rather than the Hero superclass, to create the Enemy and Projectile classes (objects). This is because by
doing it this way, we have a more optimized game, as we are only using one single .collide() method (remember that
each Hero object has a .collide() method implemented) for our JavaFX pulse event engine to process. When I convert
this game into a multi-player game (the code for this is beyond the Beginner nature of this title), I would want to
make the Enemy class a Hero subclass, so that the Enemy character could collide with things, such as Treasure and
Projectiles, just like the InvinciBagel can. Since the Enemy class still has an .update() method, it can be moved around
on the screen, where it can (and will) come out of hiding and shoot bullets (negative effect) and balls of cream cheese
(positive effect) at the InvinciBagel character. The only thing that differentiates the Hero class is the .collide() method,
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