Demo Finish

Scenes/Viewer.cs

@@ -0,0 +1,24 @@
+using Godot;
+public partial class Viewer : Node2D
+{
+	private Vector2 Origin => GetParent<CompoundConstructor>().Size / 2;
+
+	public ViewerCamera ViewerCamera { get; private set; }
+
+	// Called when the node enters the scene tree for the first time.
+	public override void _Ready()
+	{
+		ViewerCamera = GetNode<ViewerCamera>("ViewerCamera");
+		base._Ready();
+	}
+
+	public override void _Input(InputEvent @event)
+	{
+		if (@event is InputEventMouseMotion em)
+			if (em.ButtonMask == MouseButtonMask.Middle)
+				Position -= em.Relative;
+		base._Input(@event);
+	}
+
+	public void BackToCenter() => Position = Origin;
+}