为什么在碰撞后移除其他精灵在火焰中不起作用？

Question

我在游戏中有两个精灵，例如玩家和敌人。碰撞检测后为什么remove(Component)方法不起作用？

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

void main() async {
  runApp(GameWidget(
    game: CGame(),
  ));
}

class CGame extends FlameGame with HasCollidables {
  @override
  Future<void>? onLoad() async {
    add(Enemy());
    add(Player());

    return super.onLoad();
  }
}

class Enemy extends SpriteComponent with HasGameRef, HasHitboxes, Collidable {
  Enemy() : super(priority: 1);

  @override
  Future<void>? onLoad() async {
    sprite = await Sprite.load('crate.png');
    size = Vector2(100, 100);
    position = Vector2(200, gameRef.size.y / 3 * 2);
    anchor = Anchor.center;
    addHitbox(HitboxRectangle());

    return super.onLoad();
  }
}

class Player extends SpriteComponent with HasGameRef, HasHitboxes, Collidable {
  @override
  Future<void>? onLoad() async {
    sprite = await Sprite.load('player.png');
    size = Vector2(100, 100);
    position = Vector2(0, gameRef.size.y / 3 * 2);
    anchor = Anchor.center;
    addHitbox(HitboxRectangle());

    return super.onLoad();
  }

  @override
  void update(double dt) {
    position += Vector2(1, 0);
  }

  @override
  void onCollision(Set<Vector2> intersectionPoints, Collidable other) {
    if (other is Enemy) {
      print('Player hit the Enemy!');

      remove(Enemy());  //<== Why this line is not working?
    }
  }
}

Answer 1

您正在尝试移除一个敌人组件的新实例，您必须移除与您发生碰撞的特定实例，在本例中为other。 如果您在尝试删除子组件的组件上执行remove，您还想从添加它的游戏中删除other。

  @override
  void onCollision(Set<Vector2> intersectionPoints, Collidable other) {
    if (other is Enemy) {
      other.removeFromParent();
      // It can also be done like this since you have the `HasGameRef` mixin
      // gameRef.remove(other);
    }
  }
}