using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using UnityEngine.EventSystems; // 添加这一行
public class IconFollow2D : MonoBehaviour
{
    //目标对象
    public Transform target;
    //目标位置
    public Vector3 targetPos;


 
    private Camera mainCamera;
    private CanvasGroup canvas;



    void Awake()
    {
        mainCamera = Camera.main;
        canvas = GetComponent<CanvasGroup>();
        if (canvas == null)
        {
            canvas = gameObject.AddComponent<CanvasGroup>();
        }
    }



    void LateUpdate()
    {
        if (mainCamera != null)
        {
            if (target != null)
            {
                Vector3 pos = mainCamera.WorldToScreenPoint(target.position);
                pos = new Vector3(pos.x, pos.y, pos.z);
                transform.position = pos;
            }
            else if (targetPos != null)
            {
                Vector3 pos = mainCamera.WorldToScreenPoint(targetPos);
                pos = new Vector3(pos.x, pos.y, pos.z);
                transform.position = pos;
            }
            if (Time.frameCount % 5 == 0)
            {
                ResetAlpha();
            }
        }
    }


    void ResetAlpha()
    {
        if (transform.position.z > 0f && canvas.alpha < 0.1f)
        {
            canvas.alpha = 1f;
        }
        else if (transform.position.z < 0f && canvas.alpha > 0.9f)
        {
            canvas.alpha = 0f;
        }
    }

}