feat: included Tracing story

packages/pinball_components/sandbox/lib/stories/flipper/flipper.dart

@@ -2,14 +2,24 @@ import 'package:dashbook/dashbook.dart';
 import 'package:flame/game.dart';
 import 'package:sandbox/common/common.dart';
 import 'package:sandbox/stories/flipper/basic.dart';
+import 'package:sandbox/stories/flipper/tracing.dart';
 
 void addFlipperStories(Dashbook dashbook) {
-  dashbook.storiesOf('Flipper').add(
-        'Basic',
-        (context) => GameWidget(
-          game: BasicFlipperGame(),
-        ),
-        codeLink: buildSourceLink('ball/basic.dart'),
-        info: BasicFlipperGame.info,
-      );
+  dashbook.storiesOf('Flipper')
+    ..add(
+      'Basic',
+      (context) => GameWidget(
+        game: BasicFlipperGame(),
+      ),
+      codeLink: buildSourceLink('flipper/basic.dart'),
+      info: BasicFlipperGame.info,
+    )
+    ..add(
+      'Tracing',
+      (context) => GameWidget(
+        game: FlipperTracingGame(),
+      ),
+      codeLink: buildSourceLink('flipper/tracing.dart'),
+      info: FlipperTracingGame.info,
+    );
 }

packages/pinball_components/sandbox/lib/stories/flipper/tracing.dart

@@ -0,0 +1,31 @@
+import 'dart:async';
+
+import 'package:flame/components.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:pinball_components/pinball_components.dart';
+import 'package:sandbox/common/common.dart';
+
+class FlipperTracingGame extends BasicGame {
+  static const info = '''
+      Basic example of how a Flipper works.
+''';
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+
+    final center = screenToWorld(camera.viewport.canvasSize! / 2);
+
+    final leftFlipper = Flipper(side: BoardSide.left)
+      ..initialPosition = center - Vector2(Flipper.size.x, 0);
+
+    await addAll([
+      leftFlipper,
+    ]);
+
+    leftFlipper.body.joints.whereType<RevoluteJoint>().forEach(
+          (joint) => joint.setLimits(0, 0),
+        );
+    leftFlipper.removeAll(leftFlipper.children);
+  }
+}