make BaseGame non-abstract and remove SimpleGame | fix animation example

doc/examples/animation_widget/.gitignore

@@ -69,3 +69,7 @@ build/
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
 !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
+
+macos
+test
+.flutter-plugins-dependencies

doc/examples/animation_widget/lib/main.dart

@@ -9,6 +9,7 @@ import 'package:flutter/material.dart';
 Sprite _sprite;
 
 void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
   _sprite = await Sprite.loadSprite('minotaur.png', width: 96, height: 96);
   runApp(MyApp());
 }
@@ -71,7 +72,7 @@ class _MyHomePageState extends State<MyHomePage> {
             Flame.util.animationAsWidget(
                 _position,
                 animation.Animation.sequenced('minotaur.png', 19,
-                    textureWidth: 96.0)),
+                    textureWidth: 96.0, textureHeight: 96)),
             const Text('Neat, hum?'),
             const Text(
                 'By the way, you can also use static sprites as widgets:'),

lib/game/base_game.dart

@@ -21,7 +21,7 @@ import 'game.dart';
 /// It still needs to be subclasses to add your game logic, but the [update], [render] and [resize] methods have default implementations.
 /// This is the recommended structure to use for most games.
 /// It is based on the Component system.
-abstract class BaseGame extends Game with TapDetector {
+class BaseGame extends Game with TapDetector {
   /// The list of components to be updated and rendered by the base game.
   OrderedSet<Component> components =
       OrderedSet(Comparing.on((c) => c.priority()));

lib/game/embedded_game_widget.dart

@@ -6,7 +6,7 @@ import '../position.dart';
 import 'game_render_box.dart';
 import 'game.dart';
 
-/// This a widget to embed a game inside the Widget tree. You can use it in pair with [SimpleGame] or any other more complex [Game], as desired.
+/// This a widget to embed a game inside the Widget tree. You can use it in pair with [BaseGame] or any other more complex [Game], as desired.
 ///
 /// It handles for you positioning, size constraints and other factors that arise when your game is embedded within the component tree.
 /// Provided it with a [Game] instance for your game and the optional size of the widget.

lib/game/simple_game.dart

@@ -1,12 +0,0 @@
-import 'package:flame/components/component.dart';
-
-import 'base_game.dart';
-
-/// This is a helper implementation of a [BaseGame] designed to allow to easily create a game with a single component.
-///
-/// This is useful to add sprites, animations and other Flame components "directly" to your non-game Flutter widget tree, when combined with [EmbeddedGameWidget].
-class SimpleGame extends BaseGame {
-  SimpleGame(Component c) {
-    add(c);
-  }
-}

lib/util.dart

@@ -6,8 +6,8 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart' as widgets;
 
 import 'animation.dart';
+import 'game/base_game.dart';
 import 'game/embedded_game_widget.dart';
-import 'game/simple_game.dart';
 import 'sprite.dart';
 import 'components/animation_component.dart';
 import 'position.dart';
@@ -155,7 +155,7 @@ class Util {
   /// This is intended to be used by non-game apps that want to add a sprite sheet animation.
   widgets.Widget animationAsWidget(Position size, Animation animation) {
     return EmbeddedGameWidget(
-        SimpleGame(AnimationComponent(size.x, size.y, animation)),
+        BaseGame()..add(AnimationComponent(size.x, size.y, animation)),
         size: size);
   }