some tutorial fixes

content/concepts/renderer.md

@@ -32,7 +32,7 @@ namespace MyGame.Renderers
             this.gridSize = 16;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             if (SomeComponent<EditorModeComponent>() && SomeComponent<MouseComponent>())
             {

content/pong/draw_paddle/texture_renderer.md

@@ -18,7 +18,7 @@ namespace PongFE.Renderers
 {
     public class Texture2DRenderer : Renderer
     {
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
 
         }
@@ -59,13 +59,14 @@ namespace PongFE.Renderers
             _spriteBatch = spriteBatch;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.NonPremultiplied);
 
             foreach (ref readonly var entity in ReadEntities<Texture2DComponent>())
             {
                 ref readonly var positionComponent = ref GetComponent<PositionComponent>(entity);
+                ref readonly var textureComponent = ref GetComponent<Texture2DComponent>(entity);
 
                 _spriteBatch.Draw(
                     textureComponent.Texture,
@@ -129,7 +130,6 @@ Now we can rewrite our SpriteBatch draw call:
 using PongFE.Extensions;
 
 ...
-
     _spriteBatch.Draw(
         textureComponent.Texture,
         positionComponent.Position.ToXNAVector(),

content/pong/polish/paddle_bounce.md

@@ -98,23 +98,19 @@ Remove Width and Height from Texture2DComponent, and add a ScaleComponent in bot
 Then, in **Texture2DRenderer.cs** we can do:
 
 ```cs
-    public override void Render(Entity entity, in Texture2DComponent textureComponent)
+    ref readonly var scaleComponent = ref GetComponent<ScaleComponent>(entity);
-    {
-        ref readonly var positionComponent = ref GetComponent<PositionComponent>(entity);
-        ref readonly var scaleComponent = ref GetComponent<ScaleComponent>(entity);
 
-        _spriteBatch.Draw(
+    _spriteBatch.Draw(
-            textureComponent.Texture,
+        textureComponent.Texture,
-            positionComponent.Position.ToXNAVector(),
+        positionComponent.Position.ToXNAVector(),
-            null,
+        null,
-            Color.White,
+        Color.White,
-            0,
+        0,
-            Vector2.Zero,
+        Vector2.Zero,
-            new Vector2(scaleComponent.Width, scaleComponent.Height),
+        new Vector2(scaleComponent.Width, scaleComponent.Height),
-            SpriteEffects.None,
+        SpriteEffects.None,
-            0
+        0
-        );
+    );
-    }
 ```
 
 Now, in **PongFE/Engines/AngledBounceEngine.cs**:

content/pong/polish/title.md

@@ -185,7 +185,7 @@ namespace PongFE.Renderers
             InstructionFont = instructionFont;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             ref readonly var gameStateComponent = ref ReadComponent<GameStateComponent>();
             ref readonly var playAreaComponent = ref ReadComponent<PlayAreaComponent>();
@@ -215,7 +215,7 @@ namespace PongFE.Renderers
 And let's tweak the *CenterLineRenderer.Render* method a bit.
 
 ```cs
-public override void Render()
+public override void Render(double dt, double alpha)
 {
     ref readonly var gameStateComponent = ref ReadComponent<GameStateComponent>();
 

content/pong/polish/win_condition.md

@@ -102,7 +102,7 @@ namespace PongFE.Renderers
             SpriteBatch = spriteBatch;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             SpriteBatch.Begin(SpriteSortMode.Deferred, BlendState.Nonpremultiplied);
 

content/pong/scoring/center_line.md

@@ -30,7 +30,7 @@ namespace PongFE.Renderers
             WhitePixel = whitePixel;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             ref readonly var playAreaComponent = ref ReadComponent<PlayAreaComponent>();
 

content/pong/scoring/display_scaling.md

@@ -82,7 +82,7 @@ Go through the rest of **PongFEGame.cs** and replace the magic values 1280 and 7
 Let's revise our **ScoreRenderer** too.
 
 ```cs
-    public override void Render()
+        public override void Render(double dt, double alpha)
     {
         int? playerOneScore = null;
         int? playerTwoScore = null;

content/pong/scoring/drawing_score.md

@@ -148,7 +148,7 @@ namespace PongFE.Renderers
             Font = font;
         }
 
-        public override void Render()
+        public override void Render(double dt, double alpha)
         {
             int? playerOneScore = null;
             int? playerTwoScore = null;