flame/doc/examples/spritesheet/lib/main.dart

import 'package:flame/components.dart';
import 'package:flame/game.dart';
import 'package:flame/sprite.dart';
import 'package:flutter/material.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  runApp(
    GameWidget(
      game: MyGame(),
    ),
  );
}

class MyGame extends BaseGame {
  @override
  Future<void> onLoad() async {
    final spriteSheet = SpriteSheet(
      image: await images.load('spritesheet.png'),
      srcSize: Vector2(16.0, 18.0),
    );

    final vampireAnimation =
        spriteSheet.createAnimation(row: 0, stepTime: 0.1, to: 7);
    final ghostAnimation =
        spriteSheet.createAnimation(row: 1, stepTime: 0.1, to: 7);
    final spriteSize = Vector2(80.0, 90.0);

    final vampireComponent = SpriteAnimationComponent.fromSpriteAnimation(
      spriteSize,
      vampireAnimation,
    )
      ..x = 150
      ..y = 100;

    final ghostComponent =
        SpriteAnimationComponent.fromSpriteAnimation(spriteSize, ghostAnimation)
          ..x = 150
          ..y = 220;

    add(vampireComponent);
    add(ghostComponent);

    // Some plain sprites
    final vampireSpriteComponent =
        SpriteComponent.fromSprite(spriteSize, spriteSheet.getSprite(0, 0))
          ..x = 50
          ..y = 100;

    final ghostSpriteComponent =
        SpriteComponent.fromSprite(spriteSize, spriteSheet.getSprite(1, 0))
          ..x = 50
          ..y = 220;

    add(vampireSpriteComponent);
    add(ghostSpriteComponent);
  }
}