import 'dart:async'; import 'package:flame/components.dart'; import 'package:flame_forge2d/flame_forge2d.dart'; import 'package:flutter/material.dart'; extension BodyTrace on BodyComponent { void trace({Color color = const Color(0xFFFF0000)}) { paint = Paint()..color = color; renderBody = true; unawaited( mounted.whenComplete(() { final sprite = children.whereType().first; sprite.paint.color = sprite.paint.color.withOpacity(0.5); }), ); } }