feat: used a Timer in ChromeDino animation

lib/game/components/chrome_dino.dart

@@ -1,7 +1,7 @@
 import 'dart:async';
 import 'dart:math' as math;
 
-import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:flame_forge2d/flame_forge2d.dart' hide Timer;
 import 'package:flutter/material.dart';
 import 'package:pinball/game/game.dart';
 
@@ -30,7 +30,7 @@ class ChromeDino extends BodyComponent with InitialPosition {
       anchor: anchor,
     );
     final joint = _ChromeDinoJoint(jointDef)..create(world);
-    joint.swivel(joint, removed);
+    unawaited(removed.future.whenComplete(joint.dispose));
   }
 
   // TODO(alestiago): Remove once the following is added to Flame.
@@ -145,7 +145,14 @@ class _ChromeDinoAnchorRevoluteJointDef extends RevoluteJointDef {
 }
 
 class _ChromeDinoJoint extends RevoluteJoint {
-  _ChromeDinoJoint(_ChromeDinoAnchorRevoluteJointDef def) : super(def);
+  _ChromeDinoJoint(_ChromeDinoAnchorRevoluteJointDef def) : super(def) {
+    _timer = Timer.periodic(
+      const Duration(milliseconds: 100),
+      (_) => _swivel(),
+    );
+  }
+
+  late final Timer _timer;
 
   // TODO(alestiago): Remove once Forge2D supports custom joints.
   void create(World world) {
@@ -155,14 +162,11 @@ class _ChromeDinoJoint extends RevoluteJoint {
   }
 
   /// Sweeps the [ChromeDino] up and down repeatedly.
-  void swivel(RevoluteJoint joint, Completer completer) {
-    Future.doWhile(() async {
-      if (completer.isCompleted) return false;
-
-      // TODO(alestiago): Tune this values.
-      await Future<void>.delayed(const Duration(milliseconds: 1000));
-      joint.setMotorSpeed(-joint.motorSpeed);
-      return true;
-    });
+  void _swivel() {
+    setMotorSpeed(-motorSpeed);
+  }
+
+  void dispose() {
+    _timer.cancel();
   }
 }