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天行健 君子當自強而不息

Controlling Players and Characters(25)

 

Determining Victims and Processing Spell Effects

After a spell triggers and the effects are processed, what happens? As I’ve previously
mentioned, spells only affect characters, so only the character controller engine
should modify the character’s data. In the section “Creating a Character Controller
Class,” later in this chapter, you find out how to process spells in regard to characters.

 

Using the Spell Controller

At this point, the spell controller is fully functional, but without the aid of the character
controller, the spell controller won’t work. However, for the moment, hold
that thought and observe the following example, which shows how to use the spell
controller. Begin by instancing the spell controller and declaring an array of mesh
filenames:

// Graphics = pre-initialized cGraphics object
// Use two meshes

char *g_SpellMeshNames[] = {
  { “Fireball.x” },
  { “Explosion.x” }
};

Next, instance and initialize the spell controller:

cSpellController Controller;

// Initialize the controller
Controller.Init(&Graphics, “default.msl”,
   sizeof(g_SpellMeshNames)/sizeof(char*), g_SpellMeshNames, “..\\”, NULL);

Now you’re ready for action. Assuming that you have a single spell in the MSL
(spell 0), you can cast it with the following code:

Controller.Add(0, NULL, CHAR_MONSTER, 0.0f, 0.0f, 0.0f, 100.0f, 0.0f, 100.0f);

The spell will now travel from the coordinates 0,0,0 to the coordinates
100,0,100 using the settings specified in the MSL Editor. When you finish
with the spell controller, always be sure to call the controller’s Shutdown function:

Controller.Shutdown();

 

Combat and Characters

There are times when characters just can’t get along. For those special moments,
you need to teach those critters just who the boss is. Handling combat in your
game is a necessity that, fortunately, is easy to carry out.

Although the flashy graphics and cool special effects are something you want in
combat sequences, you need to start with the basics. Behind every combat action is
a set of rules (called the combat rules) that determines the outcome of every swing
of a weapon, every deflected blow, and the result of each magic spell.

Earlier in the chapter, you learned about character abilities—those abilities that
determine a character’s strength, agility, and so on. The abilities that most concern
you at this point are those to determine whether an attack hits its mark and how
much damage it does. Following a succinct set of rules, you can use those character
abilities to determine the outcome of combat.

 

Using Combat Rules for Attacking

Your game depends greatly on a set of underlying rules for handling combat, much
like traditional pen-and-paper role-playing games. Those rules are a set of mathematical
equations, which, when applied with a little randomness, determine the
outcome of attacks, damage, and defense.

The combat rule set (CRS) of your game works off the character’s abilities, attributes,
and skills that you’ve already seen in this chapter. Remember how those abilities,
skills, and attributes are assigned a numerical value? Guess what? Those values are
used to generate a few values that determine the outcome of combat actions.

For example, a character’s to-hit attribute is used in a random number calculation
to see whether an attack lands. Then a check against the agility of the attacker’s
opponent determines whether the attack was dodged. If the opponent was not so
lucky, the attacker’s attack values come into play to determine the damage.
Remember that the character being hit also has a defense ability that helps reduce
the amount of damage.

Once the decision to attack is made, a few steps determine the outcome.


posted on 2007-12-03 20:12 lovedday 閱讀(184) 評論(0)  編輯 收藏 引用

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