Strength and Armor

Ave Caesar! Morituri te salutant!

Until now we've seen how we can output, check and modify Stats and Attributes that involve one single target. But what happens when we need to target more?

(Player casting a Fireball towards an enemy)

In this case we'll be covering how to deal damage to an enemy based on the attacker's power and the attack receiver's defense stats.

Attack & Defense Stats

First and foremost we need to define a couple of Stats that will be shared across all characters: The Attack and the Defense.

For simplicity we haven't created a Formula for either the Attack or the Defense Sats. A Stat without a Formula will return its value as it is.

The Fireball

To cast the Fireball spell we need to create a Trigger that listens for a certain key (in our case the Mouse 0) so that it starts an Action that will instantiate the Fireball object.

This Fireball object will have a Trigger that detects when it collides with any game object. For every game object which it collides with, we'll invoke an Action sequence that will reduce the health stat of the collided object.

Note how we can try changing a Stat value of any object. If that object doesn't have a Stats component, it will simply ignore that Action.

Damage Output

We've previously seen how we can increase the mana of a character by a fixed certain amount over the course of time. Now we want to do something similar (change the value of an Attribute) but by a dynamic value that depends both on the attacker's attack stat and the target's defense stat.

(Reduce the health of the Invoker based on a Formula and an Opponent)

To do so, instead of using a constant float value we'll be using the output of a Formula as the value we'll be subtracting to the health attribute of the enemy. Here's how that Formula looks like:

-1 * (stat:other[attack] - stat[defense])

Let's break that down: Because we're executing the Action from the enemy's point of view, stat:other[attack] returns the attack stat of the caster of the Fireball. We subtract to the attack power the defense of the enemy with stat[defense] and we finally multiply the whole expression by -1 because we don't want to increase, but decrease the health of the enemy.