flame/examples/lib/stories/animations/aseprite_example.dart

import 'package:flame/components.dart';
import 'package:flame/game.dart';

class AsepriteExample extends FlameGame {
  static const String description = '''
    This example shows how to load animations from an Aseprite json file and a
    sprite sheet. There is no interaction on this example.
  ''';

  @override
  Future<void> onLoad() async {
    final image = await images.load('animations/chopper.png');
    final jsonData = await assets.readJson('images/animations/chopper.json');
    final animation = SpriteAnimation.fromAsepriteData(image, jsonData);
    final spriteSize = Vector2.all(200);
    final animationComponent = SpriteAnimationComponent(
      animation: animation,
      position: (size - spriteSize) / 2,
      size: spriteSize,
    );
    add(animationComponent);
  }
}