How do I use class_name and export variables together?

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1

Godot Version

4.5

Question

I’m having a little trouble understand how to use this two together to create units for my strategy game. An explanation would be appreciated!

2

class_name is needed if you want to create instances of the class.

Export variables allow values to be set in the editor. I also use them to specify the variables I intend for use in other classes.

class_name CharacterAttributes
extends Resource

@export var health: float = 100
@export var move_speed: float = 150.0
@export var awareness_distance: float = 250.0

You can use the export variables to modify the instance data in your code.

var char = CharacterAttributes.new()
char.health = 250 
print(str("Char health is ", char.health))
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3

What is the purpose of the “extends Resource”?

4

It means that CharacterAttributes class inherits Resource class. It’s like it has all the functionality of Resource class but you can add extra functionality to it only specific to CharacterAttributes.

A tutorial about class inheritence:

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5

Not strictly needed. You can new() script resources as well:

load("res://my_script_class.gd").new()

You can also inherit anonymous classes by just specifying the script resource filename:

extends "res://my_script_class.gd"

Of course, using class names is much nicer and more readable.

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