Creating an Inventory System for a Roguelite game. Having some issues

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Godot Version

Godot 4

Question

Hi forum people!
I’m working on a Roguelite game where you get various weapons throughout each run, I have a general idea on how to do an inventory system.
But I have to make an Inventory system where every item obtained executes its code for attack or boost (hopefully without having to do a long series of ifs on each character)

To make you understand, here’s respectively

The code used on my character (which at the moment includes a snippet of the code used for the “starter_attack” weapon (weapon 1))

extends CharacterBody2D


const SPEED = 200.0
const JUMP_VELOCITY = -400.0
@export var weapon1: PackedScene 
var new_weapon


func _physics_process(delta: float) -> void:
	# Add the gravity.

	# Handle jump.

	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var direction_horizontal := Input.get_axis("ui_left", "ui_right")
	if direction_horizontal:
		velocity.x = direction_horizontal * SPEED
	else:
		velocity.x = move_toward(velocity.x, 0, SPEED)

	var direction_vertical := Input.get_axis("ui_up", "ui_down")
	if direction_vertical:
		velocity.y = direction_vertical * SPEED
	else:
		velocity.y = move_toward(velocity.y, 0, SPEED)

	move_and_slide()


func _on_timer_timeout() -> void:
	var weapon_pos = global_position + Vector2(30, 0) 
	new_weapon = weapon1.instantiate()
	add_child(new_weapon)
	new_weapon.global_position = weapon_pos

The code I have on the “starter_attack” scene:

extends Node2D
@export var attack_resource: Resource

# Called when the node enters the scene tree for the first time.
func _ready() -> void:
	pass


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta: float) -> void:
	pass


func _on_area_2d_body_entered(body: Node2D) -> void:
	if body.is_in_group("enemies"):
		body.health -= attack_resource.damage

The “attack_resource” is just:

extends Resource
class_name weapon_resource

@export var damage: int = 5
@export var weapon_level: int = 1

So I wanted to base myself on this video:

Basically transforming each item into a resource and then having an array resource for the inventory.
But I would still have no idea how I would run the resource’s code (attacks (timer for spawn and despawn included), boosts etc.) once they are attached to the inventory array.

Do I like make it so that the array loads them as child of my character somehow? that would be a bit unfunctional for items that have to spawn and then despawn though (Example: I have a double-headed spear and I’m making it appear one second and then disappear the one later (as you can see in the codes for the character and the starter_attack)) Edit: About that, maybe I could add code for generating the timers itself in the resource?b(I really have no idea.)

Thanks in advice for the help. This forum is always so useful and welcoming.

2

Hey! I’m not sure if I understood correctly, but I’ll give it a try

  • You want to execute a piece of code (the attack logic) for every item in the user inventory
  • Every item is a resource
  • I assume every weapon can be wildly different

If that’s the case, I think I ran into a similar situation in my game. What you could do is to add a new PackedScene property (let’s call it LogicScene for this example) in your weapon_resource, which points to a Scene with the actual logic for the attack. I use C#, so my nomenclature could be a little off, sorry!

This LogicScene would have, at least, a reference to the original resource (so you can get the damage and weapon level), and a method to execute the attack logic. If you wanna attach a sprite to it, you could add a Sprite2D to the LogicScene, which gets its texture from the original resource.

Then whenever your character acquires a weapon, you instantiate a LogicScene and add it to an array of acquired weapons.

Hope it helps!

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3

That’s literally what I needed to do! Or at least, I think so, I’ll try.
Thanks.

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