cirnogodot/addons/ButtonLink/DoorButtonVisualizer.cs

using Godot;

[Tool]
public partial class DoorButtonVisualizer : Node2D
{
    [Export] public NodePath TargetPath; // Expose the Target NodePath in the editor

    public override void _Draw()
    {
        if (TargetPath == null || !Engine.IsEditorHint())
            return;

        // Get the target node
        Node targetNode = GetNodeOrNull(TargetPath);
        if (targetNode == null || !(targetNode is Node2D target))
            return;

        // Draw a line to the target
        Vector2 start = GlobalPosition;
        Vector2 end = target.GlobalPosition;

        DrawLine(ToLocal(start), ToLocal(end), Colors.Green, 2);
    }
    
    public override void _Process(double delta)
    {
        // Update the visualization in the editor
        if (Engine.IsEditorHint())
        {
            QueueRedraw();
        }
    }
}