ゲームで敵を管理する場所

EnemyManager.cs

[Serializable]
public class EnemyManager {

	private Player player;
	[SerializeField]private List<Enemy> enemies = new List<Enemy> ();

	public EnemyManager (Player p) {
		player = p;
	}

	public void AddEnemy (Enemy e) {
		enemies.Add (e);
	}

	public void DeleteEnemy (Enemy e) {
		enemies.Remove (e);
	}

	public Enemy getNearEnemy () {
		Enemy nearEnemy = null;
		float minDistance = 100f;
		foreach (var e in enemies) {
			float distance = getDistance (player.transform.position, e.transform.position);
			if (minDistance > distance) {
				minDistance = distance;
				nearEnemy = e;
			}
		}
		return nearEnemy;
	}

	private float getDistance (Vector3 a, Vector3 b) {
		Vector3 dv = a - b;
		return Mathf.Pow ((dv.x * dv.x + dv.y * dv.y + dv.z * dv.z), 0.5f);
	}
}