fix: Finishing touches to use v1.9.x+ world and camera and complete I…

…ssue #2799 (#2824)

Previously, as part of Issue #2798, I fixed the Klondike Tutorial app's
step4 executable to use the Flame 1.9.x `world` and `camera` built-in
objects and described the new code in the Step 2 tutorial, where it
first appears in the discussion. However, the Step 2 and Step 3 tutorial
texts have options to execute code and those did not include the new
code. Accordingly, I have cloned the relevant code into
`app/lib/step2/klondike_game.dart` and
`app/lib/step3/klondike_game.dart`. I have also checked that there are
no `*.md` files to be updated. The `step2.md` tutorial file covers Issue
#2799 AFAICS.

doc/tutorials/klondike/app/lib/step2/klondike_game.dart

@@ -41,19 +41,15 @@ class KlondikeGame extends FlameGame {
         ),
     );
 
-    final world = World()
-      ..add(stock)
-      ..add(waste)
-      ..addAll(foundations)
-      ..addAll(piles);
-    add(world);
+    world.add(stock);
+    world.add(waste);
+    world.addAll(foundations);
+    world.addAll(piles);
 
-    final camera = CameraComponent(world: world)
-      ..viewfinder.visibleGameSize =
-          Vector2(cardWidth * 7 + cardGap * 8, 4 * cardHeight + 3 * cardGap)
-      ..viewfinder.position = Vector2(cardWidth * 3.5 + cardGap * 4, 0)
-      ..viewfinder.anchor = Anchor.topCenter;
-    add(camera);
+    camera.viewfinder.visibleGameSize =
+        Vector2(cardWidth * 7 + cardGap * 8, 4 * cardHeight + 3 * cardGap);
+    camera.viewfinder.position = Vector2(cardWidth * 3.5 + cardGap * 4, 0);
+    camera.viewfinder.anchor = Anchor.topCenter;
   }
 }
 

doc/tutorials/klondike/app/lib/step3/klondike_game.dart

@@ -44,19 +44,15 @@ class KlondikeGame extends FlameGame {
         ),
     );
 
-    final world = World()
-      ..add(stock)
-      ..add(waste)
-      ..addAll(foundations)
-      ..addAll(piles);
-    add(world);
+    world.add(stock);
+    world.add(waste);
+    world.addAll(foundations);
+    world.addAll(piles);
 
-    final camera = CameraComponent(world: world)
-      ..viewfinder.visibleGameSize =
-          Vector2(cardWidth * 7 + cardGap * 8, 4 * cardHeight + 3 * cardGap)
-      ..viewfinder.position = Vector2(cardWidth * 3.5 + cardGap * 4, 0)
-      ..viewfinder.anchor = Anchor.topCenter;
-    add(camera);
+    camera.viewfinder.visibleGameSize =
+        Vector2(cardWidth * 7 + cardGap * 8, 4 * cardHeight + 3 * cardGap);
+    camera.viewfinder.position = Vector2(cardWidth * 3.5 + cardGap * 4, 0);
+    camera.viewfinder.anchor = Anchor.topCenter;
 
     final random = Random();
     for (var i = 0; i < 7; i++) {