using UnityEngine;

public class UIFollowObject : MonoBehaviour
{
    public Transform targetObject;  // 要跟随的物体
    public RectTransform uiElement; // UI元素的RectTransform组件

    private Camera mainCamera;      // 主摄像机

    private void Start()
    {
        mainCamera = Camera.main;   // 获取主摄像机的引用
    }

    private void Update()
    {
        // 将物体的位置转换为屏幕空间坐标
        Vector3 screenPos = mainCamera.WorldToScreenPoint(targetObject.position);

        // 更新UI元素的位置
        uiElement.anchoredPosition = new Vector2(screenPos.x, screenPos.y);

        // 计算物体与摄像机之间的距离
        float distance = Vector3.Distance(targetObject.position, mainCamera.transform.position);

        // 根据距离设置UI元素的缩放
        uiElement.localScale = Vector3.one * distance;
    }
}