Reverting doc rename

doc/examples/animation_widget/lib/main.dart

@@ -0,0 +1,97 @@
+import 'dart:async';
+
+import 'package:flame/animation.dart' as animation;
+import 'package:flame/sprite.dart';
+import 'package:flame/flame.dart';
+import 'package:flame/position.dart';
+import 'package:flutter/material.dart';
+
+Sprite _sprite;
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  _sprite = await Sprite.loadSprite('minotaur.png', width: 96, height: 96);
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Animation as a Widget Demo',
+      theme: ThemeData(primarySwatch: Colors.blue),
+      home: MyHomePage(),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  @override
+  _MyHomePageState createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  Position _position = Position(256.0, 256.0);
+
+  @override
+  void initState() {
+    super.initState();
+    changePosition();
+  }
+
+  void changePosition() async {
+    await Future.delayed(const Duration(seconds: 1));
+    setState(() {
+      _position = Position(10 + _position.x, 10 + _position.y);
+    });
+  }
+
+  void _clickFab(GlobalKey<ScaffoldState> key) {
+    key.currentState.showSnackBar(
+      const SnackBar(
+        content: const Text('You clicked the FAB!'),
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final key = GlobalKey<ScaffoldState>();
+    return Scaffold(
+      key: key,
+      appBar: AppBar(
+        title: const Text('Animation as a Widget Demo'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            const Text('Hi there! This is a regular Flutter app,'),
+            const Text('with a complex widget tree and also'),
+            const Text('some pretty sprite sheet animations :)'),
+            Flame.util.animationAsWidget(
+              _position,
+              animation.Animation.sequenced(
+                'minotaur.png',
+                19,
+                textureWidth: 96.0,
+                textureHeight: 96,
+              ),
+            ),
+            const Text('Neat, hum?'),
+            const Text(
+                'By the way, you can also use static sprites as widgets:'),
+            Flame.util.spriteAsWidget(const Size(100, 100), _sprite),
+            const SizedBox(height: 40),
+            const Text('Sprites from Elthen\'s amazing work on itch.io:'),
+            const Text('https://elthen.itch.io/2d-pixel-art-minotaur-sprites'),
+          ],
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () => _clickFab(key),
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+}