我的游戏中的角色/玩家一旦接近边缘就会慢慢滑下平台。我该如何解决这个问题？理想情况下，即使在这样的情况下，我的角色也会保持在平台上：x1c 0d1x
我的Player类（onCollision方法是相关部分）：

class Player extends SpriteAnimationGroupComponent with HasGameRef<Gain>, KeyboardHandler, CollisionCallbacks {
  String character;
  Player({pos, this.character = "Ninja Frog"}) : super(position: pos);

  final double stepTime = 0.05;

  ...
  @override
  void onCollision(Set<Vector2> intersectionPoints, PositionComponent other) {
    if (other is Platform) {
      if (intersectionPoints.length == 2) {
        Vector2 mid = (intersectionPoints.elementAt(0) + intersectionPoints.elementAt(1)) / 2;
        Vector2 collisionNormal = absoluteCenter - mid;
        final seperationDist = (size.x / 2) - collisionNormal.length;
        collisionNormal.normalize();
        if (Vector2(0, -1).dot(collisionNormal) > 0.9) {
          _isOnGround = true;
        }
        position += collisionNormal.scaled(seperationDist);
      }
    }
    super.onCollision(intersectionPoints, other);
  }
}

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我的平台类，代表游戏的墙壁，地面，天花板：

class Platform extends PositionComponent with CollisionCallbacks {
  bool canJumpThrough;
  Platform({required Vector2 position, required Vector2 size, this.canJumpThrough = false}) : super(position: position, size: size);

  @override
  FutureOr<void> onLoad() {
    add(RectangleHitbox(collisionType: CollisionType.passive));
    return super.onLoad();
  }
}

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