refactor: keep positioning

packages/pinball_components/lib/src/components/chrome_dino.dart

@@ -26,7 +26,9 @@ class ChromeDino extends BodyComponent with InitialPosition {
   /// Anchors the [ChromeDino] to the [RevoluteJoint] that controls its arc
   /// motion.
   Future<_ChromeDinoJoint> _anchorToJoint() async {
-    final anchor = _ChromeDinoAnchor();
+    final anchor = _ChromeDinoAnchor()
+      ..initialPosition = initialPosition + Vector2(9, -4);
+
     await add(anchor);
 
     final jointDef = _ChromeDinoAnchorRevoluteJointDef(
@@ -85,12 +87,7 @@ class ChromeDino extends BodyComponent with InitialPosition {
 }
 
 class _ChromeDinoAnchor extends JointAnchor {
-  _ChromeDinoAnchor() {
-    initialPosition = Vector2(
-      ChromeDino.size.x / 2 + 9,
-      ChromeDino.size.y / 2 - 4,
-    );
-  }
+  _ChromeDinoAnchor();
 
   // TODO(allisonryan0002): if these aren't moved when fixing the rendering, see
   // if the joint can be created in onMount to resolve render syncing.