cirnogodot/Scripts/Bullet.cs

using Godot;
using System;
using System.Diagnostics;

public partial class Bullet : Area2D
{
	[Export]
	public float Speed = 1900f;

	[Export]
	public float Damage = 1f;
	
	[Export]
	public BulletOwner Owner = BulletOwner.None;

	private Vector2 _direction = Vector2.Right;

	//public delegate void BulletHitEventHandler(Node Body);
	//public event BulletHitEventHandler BulletHit;

	// Called when the node enters the scene tree for the first time.
	public override void _Ready()
	{
		//this.Connect("body_entered", new Callable(this, nameof(OnBodyEntered)));
	}

	//private void OnBodyEntered(Node body)
	//{
	// When a body is entered, invoke the event and pass the collided body
	//	BulletHit?.Invoke(body);

	// Then remove the bullet
	//	QueueFree();
	//}

	public void SetDirection(Vector2 direction)
	{
		var normalized = direction.Normalized();

		_direction = normalized;

		//Debug.WriteLine($"Bullet Shot at direction {direction.X} {direction.Y}");
	}


	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
		this.Position += ((float)(Speed * delta) * _direction);
	}

	private void _on_visible_on_screen_notifier_2d_screen_exited()
	{
		//Debug.WriteLine("Destroy bullet out of screen");
		QueueFree();
	}

	private void _on_body_entered(Node2D body)
	{
		if (body.IsInGroup("Solid"))
		{
			//Debug.WriteLine("Collision");
			QueueFree();
		}
		//// Do not Collide with body for purpose of destroying bullets
		// else if (body.IsInGroup("Destroyable"))
		// {
		// 	Debug.WriteLine("Collision with destroyable object body");
		// 	QueueFree();
		// }


	}

	private void _on_area_entered(Area2D area)
	{
		if (area.IsInGroup("Solid"))
		{
			QueueFree();
			return;
		}

		if (area.IsInGroup("Destroyable") && area is IDestructible destructible)
		{
			//Debug.WriteLine("Collision with destroyable object area");
			
			destructible.Hit(Damage);

			QueueFree();
		}
	}
}

public enum BulletOwner
{
	None,
	Player,
	Enemy
}