More nullable fixes, make SetTransform a part of base Renderer.

TestGame/UiLayer.cs

@@ -18,7 +18,7 @@ public class UiLayer : Layer
     protected override void OnUpdate(double dt)
     {
         base.OnUpdate(dt);
-        // _textLabel.Text = $"{MathF.Round(1 / (float)dt)} FPS";
+        if (Scene is null) return;
         _screenContainer.UpdateRect(Vector2.Zero, Scene.Renderer.WindowSize);
     }
 
@@ -39,7 +39,8 @@ public class UiLayer : Layer
 
     private void CreateUiElements()
     {
-        _screenContainer = new Container();
+        if (Scene is null) return;
+
         _screenContainer.UpdateRect(Vector2.Zero, Scene.Renderer.WindowSize);
 
         var style = new PanelStyle()
@@ -56,7 +57,7 @@ public class UiLayer : Layer
 
         var exampleText = new TextLabel()
         {
-            Font = _defaultFont,
+            Font = _defaultFont!,
             FontSize = 20,
             Text = "This Panel will occupy 50% of the screen.\nThis text in particular is inside a panel with an absolute margin of 16px.\nHow cool is that?"
         };
@@ -89,10 +90,9 @@ public class UiLayer : Layer
     }
 
 
-    private Font _defaultFont;
-    private Container _screenContainer;
-    private Panel _panel, _contentPanel;
-    private TextLabel _textLabel;
+    private Font? _defaultFont;
+    private Container _screenContainer = new();
+    private Panel? _panel;
 
     private Logger _logger = new(nameof(UiLayer));
 }