this post was submitted on 14 Mar 2024
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15
On-Kill/On-Hit effects: Signal train vs reference passing (lemmy.world)
submitted 8 months ago by Jozzo@lemmy.world to c/godot@programming.dev
6 comments fedilink hide all child comments
 

Wanted some opinions on ways to set up triggering "on-kill" effects. In short: The player can have abilities that trigger effects whenever they shoot and kill an enemy. I'm also looking to extend abilities to enemies as well, so can't just hardcode a player reference.

Currently I'm doing it like this:

  • Enemy signals that it died -> the bullet receives this and signals that it killed Enemy -> the player's weapon receives this and signals that it's bullet killed Enemy -> the player receives this and triggers it's on-kill abilities.

It simultaneously feels like a good way to go about it but also a long mess. The other option I've considered is:

  • Each bullet has a reference to it's owner (eg. player). When an enemy dies to a bullet, it looks to the bullet's owner reference and tells it to trigger it's on-kill effects.

This way is a lot simpler to write, but is error prone eg. In cases where the bullet's owner is killed while their attack is mid-air.

Thank you all!

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[โ€“] rtxn@lemmy.world 4 points 8 months ago* (last edited 8 months ago) (1 children)

I have little experience with Godot, so I'll just write the general concept and you'll have to translate.

I'd go with #2, but also have the bullet subscribe to an event that is triggered when the shooter player dies. When that happens, set a private variable that tells the bullet that it shouldn't trigger any on-kill effects (or you could do other things like detonate or remove the bullet).

Something like that in C# (or close to C#, it's been a while):

class Bullet {
    private Player _player = null;
    private bool _enableOnDeathEffect = true;

    private void OnPlayerDeath(object sender, EventArgs e) {
        _enableOnDeathEffect = false;
    }

    public void OnKill(){
        if (_enableOnDeathEffect) {
            //trigger effect
        }
    }

    public Bullet(player) {
        _player = player;
        player.OnDeath += OnPlayerDeath;
    }
}
[โ€“] Jozzo@lemmy.world 1 points 8 months ago

Thanks for your input! The other commenters pointed out that I can use Godot's is_instance_valid() function to check if the bullet's owner exists before attempting to call anything on it, so will be reworking the system to use #2 + that.