using System.Collections;
using System.Collections.Generic;
using UnityEngine;

using XericLibrary.Runtime.Type;

namespace XericLibrary.Runtime.SpatialTransform
{
    /// <summary>
    /// 设定偏移来自追踪目标
    /// </summary>
    public class OffsetFromTrackTarget : WeaklyMonoBase
	{
		/// <summary>
		/// 追踪目标
		/// </summary>
		public Transform TrackTarget;

		/// <summary>
		/// 偏移量
		/// </summary>
		public Vector3 Offset;


		private void Update()
		{
			if(TrackTarget != null)
			{
				var pos = transform.position;
				pos.y = 0;
				var trackPos = TrackTarget.position;
				trackPos.y = 0;

				transform.position = TrackTarget.position + TrackTarget.rotation * Offset;

				transform.rotation = Quaternion.LookRotation(pos - trackPos);
			}
		}

		/// <summary>
		/// 初始化
		/// </summary>
		/// <param name="tracK"></param>
		public void Initialized(Transform tracK, Vector3 offset)
		{
			TrackTarget = tracK;
			Offset = offset;
		}
	}
}