Installing

1. Download the .zip file and extract the addons folder to your root project folder res://
2. Enable the addon by ticking the enable checkbox at Project -> Project Settings -> addons

About

This is a simple rework from my past fsm implementation for gdscript purists, no dedicated editors, just create the script and use it. I intend to keep adding functionality to this addon but its not supposed to evolve firthuer than just being a "fuck, I need a FSM" solution. In almost every game I game I need a FSM for something and this always save my butt from having to code it from scratch.

Here's a basic example

public partial class IdleState : SimpleFSMState {
	
	[Export] private AnimationPlayer animPlayer;
	[Export] private CharacterBody2D node;
	public override void OnEnter() {
		animPlayer.Play("idle");
		node.Velocity = Vector2.Zero;
	}

	public override void OnPhysicsProcess(double delta) {
		if (Input.IsActionPressed("down") || Input.IsActionPressed("up") || Input.IsActionPressed("left") ||
		    Input.IsActionPressed("right")) {
			EmitSignal(SignalName.ChangeState, nameof(WalkingState));
		}
	}
}

Known issues

• When you add a SimpleFSMState to the scene and extend the script, Godot will not understant that its supposed to inherit from SimpleFSMState, it will try to inherit from SimpleFsmState, just fix the class name and dont forget to add the namespace.

Changing States

To change states you have a signal on the State class (I need to fucking change this, this is not scalable) that you can emit.

EmitSignal(SignalName.ChangeState, nameof(WalkingState));

State class

Heres the virtual methods you can implement at the moment

    public virtual void OnEnter(){}
    public virtual void OnExit(){}
    public virtual void OnProcess(double delta){}
    public virtual void OnPhysicsProcess(double delta){}