Script to visualize connections

addons/ButtonLink/ButtonLink.cs

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+#if TOOLS
+using Godot;
+using System;
+
+[Tool]
+public partial class ButtonLink : EditorPlugin
+{
+    public override void _EnterTree()
+    {
+        // Add a custom type for visualizing the link
+        Script visualizerScript = GD.Load<Script>("res://addons/ButtonLink/DoorButtonVisualizer.cs");
+        AddCustomType("ButtonDoorVisualizer", "Node2D", visualizerScript, null);
+    }
+
+    public override void _ExitTree()
+    {
+        // Remove the custom type when the plugin is disabled
+        RemoveCustomType("ButtonDoorVisualizer");
+    }
+}
+#endif

addons/ButtonLink/DoorButtonVisualizer.cs

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+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();
+        }
+    }
+}

addons/ButtonLink/plugin.cfg

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+[plugin]
+name="Door Button Link"
+author="Your Name"
+version="1.0"
+description="Draws lines between linked buttons and doors in the editor."
+script="ButtonLink.cs"