Flutter Flame 中相机不跟随玩家

Question

这是我第一次尝试使用Flame引擎Flutter制作游戏。但是，我遇到了相机问题，即使我将其设置为跟随，它也不会移动。我尝试将相机跟随代码移至更新函数，但它引发错误。

此外，我在官方 Flame 文档中找不到更多关于如何实现此功能的文档。

这是我的主要游戏代码。如有需要，请随时询问代码的其他部分。

import 'dart:async';
import 'dart:math';
import 'package:flame/events.dart';
import 'package:flame/flame.dart';
import 'package:flame/game.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:whirlybird/components/obstacle.dart';
import 'package:whirlybird/components/player.dart';

class GameScreen extends StatelessWidget {
  const GameScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return GameWidget(
      game: MainGame(),
    );
  }
}

class MainGame extends FlameGame with HorizontalDragDetector, HasCollisionDetection, TapDetector {
  @override
  Color backgroundColor() => Colors.white;

  double birdX = 50;
  double birdY = 500;
  double birdSpeed = 0;
  late double touchDownX;
  late double screenWidth;
  late double screenHeight;

  late final Obstacle obstacle;
  late final Player player;

  @override
  bool get debugMode => kDebugMode;

  @override
  void onRemove() {
    Flame.images.clearCache();
    Flame.assets.clearCache();
  }

  @override
  FutureOr<void> onLoad() async {
    // Load assets
    screenWidth = size[0];
    screenHeight = size[1];

    final random = Random();
    for (int i = 0; i < 10; i++) {
      final x = random.nextDouble() * (size[0] - 10) + 10;
      final y = random.nextDouble() * (size[1] - 10) + 10;
      add(Obstacle(positionVector: Vector2(x, y)));
    }
    player = Player(positionVector: Vector2(birdX, birdY), collisionCallback: flap);
    add(player);
    player.position = Vector2(birdX, birdY); // Jump

    camera.follow(player);

    return super.onLoad();
  }

  void flap() {
    birdSpeed = -5;
  }

  @override
  void onHorizontalDragDown(DragDownInfo info) {
    touchDownX = info.raw.globalPosition.dx;
  }

  @override
  void onHorizontalDragUpdate(DragUpdateInfo info) {
    double touchX = info.raw.globalPosition.dx;
    double deltaX = touchX - touchDownX;
    birdX += deltaX;
    touchDownX = touchX;
  }

  @override
  void update(double dt) {
    birdY += birdSpeed;
    birdSpeed += 0.1;

    player.position = Vector2(birdX, birdY);
    super.update(dt);
  }
}

任何帮助将不胜感激！谢谢！

Answer 1

您使用的是哪个版本的 Flame？

如果是最新的，那么您必须将组件添加到世界对象而不是主游戏中。因此，不要使用

add(player);

，而是使用

world.add(player)

还要确保 Player 组件扩展了 PositionComponent 或具有使跟随机制正常工作的实现！