2DGUI跟随3d物体移动

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class test : MonoBehaviour
{
    [Header("3d物体分散")]
    public List<Transform> list_obj;
    [Header("根节点root")]
    public Transform center;
    [Header("gui预制件")]
    public GameObject image;
    //gui身上挂载
    private Image_data[] image_Dates;
    private Line_data[] line_Dates;
    public Canvas canvas;
    // Start is called before the first frame update
    void Start()
    {
        Init();
    }
    // Update is called once per frame
    void Update()
    {
        Update_image();
        Update_line();
    }
    void Init()
    {
        if (canvas == null)
        {
            canvas =FindObjectOfType<Canvas>();
        }
        //中心点
        GameObject obj_center = Instantiate(image, canvas.transform.GetChild(0));
        obj_center.AddComponent<Image_data>().vector3 = center.position;
        obj_center.GetComponent<Image>().color = Color.green;
        obj_center.name = "root";
        //分支点与线条
        for (int i = 0; i < list_obj.Count; i++)
        {
            GameObject obj = Instantiate(image, canvas.transform.GetChild(0));
            obj.AddComponent<Image_data>().vector3 = list_obj[i].position;

            GameObject line = Instantiate(image, canvas.transform.GetChild(1));
            Line_data line_Data = line.AddComponent<Line_data>();
            line_Data.start_pos = obj_center;
            line_Data.end_pos = obj;
            line_Data.color = Color.red;
            line_Data.width = 2;
        }
        

        image_Dates = FindObjectsOfType<Image_data>();
        line_Dates= FindObjectsOfType<Line_data>();
    }
    /// <summary>
    /// 更新热点
    /// </summary>
    void Update_image()
    {
        if (image_Dates.Length <= 0) return;
        for (int i = 0; i < image_Dates.Length; i++)
        {
            //3d物体世界坐标转屏幕坐标，父类原点在左下角 canvas.scaleFactor作用于自适应画布大小
            Vector3 target_pos = Camera.main.WorldToScreenPoint(image_Dates[i].vector3) / canvas.scaleFactor;

            //正面
            if (target_pos.z >= 0)
            {
                if (target_pos.x <= 0)
                {
                    target_pos.x = 0;
                }
                else if (target_pos.x >= Screen.width)
                {
                    target_pos.x = Screen.width;
                }

                if (target_pos.y <= 0)
                {
                    target_pos.y = 0;
                }
                else if (target_pos.y >= Screen.height)
                {
                    target_pos.y = Screen.height;
                }
            }//背面
            else
            {
                target_pos.x = 0;
                target_pos.y = 0;
            }

            image_Dates[i].transform.position = new Vector3(target_pos.x, target_pos.y, 0);
        }
    }
    /// <summary>
    /// 更新线条
    /// </summary>
    void Update_line()
    {
        if (line_Dates.Length <= 0) return;
        for (int i = 0; i < line_Dates.Length; i++)
        {
            Line_data line_Data = line_Dates[i].GetComponent<Line_data>();
            RectTransform rectTransform = line_Dates[i].GetComponent<RectTransform>();
            rectTransform.sizeDelta = new Vector2(line_Data.width, Vector2.Distance(line_Data.start_pos.transform.position, line_Data.end_pos.transform.position));
            rectTransform.pivot = new Vector2(0.5f, 0f);
            rectTransform.anchoredPosition =line_Data.start_pos.transform.position;
            //设置角度
            double angle = Math.Atan2(line_Data.end_pos.transform.position.y -line_Data.start_pos.transform.position.y, line_Data.end_pos.transform.position.x -line_Data.start_pos.transform.position.x) * 180 / Math.PI;

            line_Dates[i].GetComponent<RectTransform>().rotation = Quaternion.Euler(0, 0, (float)angle + 270);
        }
    }

}
/// <summary>
/// 热点类
/// </summary>
public class Image_data:MonoBehaviour
{
    //3d坐标存起来
    public Vector3 vector3;
    public Color color;
}
/// <summary>
/// 线条类
/// </summary>
public class Line_data : MonoBehaviour
{
    public GameObject start_pos;
    public GameObject end_pos;
    public Color color;
    public int width;
}