basic capture functionality

scripts/world/PlayerInteractor.cs

@@ -0,0 +1,52 @@
+using Godot;
+using System.Collections.Generic;
+
+public partial class PlayerInteractor : Area2D
+{
+	private readonly List<Creature> _nearbyCreatures = new();
+	private GameRoot _gameRoot = null!;
+
+	public override void _Ready()
+	{
+		AreaEntered += OnAreaEntered;
+		AreaExited += OnAreaExited;
+	}
+
+	public override void _Process(double delta)
+	{
+		if (!Input.IsActionJustPressed("interact"))
+			return;
+
+		var creature = GetClosestCreature();
+		if (creature == null) return;
+		
+		// Ask GameRoot to start capture
+		GameRoot.Instance.RequestCapture(creature);
+	}
+
+	private void OnAreaEntered(Area2D area)
+	{
+		if (area is Creature c && !c.IsCaptured)
+			_nearbyCreatures.Add(c);
+	}
+
+	private void OnAreaExited(Area2D area)
+	{
+		if (area is Creature c)
+			_nearbyCreatures.Remove(c);
+	}
+
+	private Creature? GetClosestCreature()
+	{
+		Creature? best = null;
+		float bestDist = float.MaxValue;
+
+		foreach (var c in _nearbyCreatures)
+		{
+			if (!IsInstanceValid(c)) continue;
+			float d = GlobalPosition.DistanceSquaredTo(c.GlobalPosition);
+			if (d < bestDist) { bestDist = d; best = c; }
+		}
+		return best;
+	}
+}