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

//一个可无限伸长的尺子 尺子位置是尺子的起点 通过指向目标 改变自身长度的方式始终保持两端与待测量的两个点重合  
public class RulerInstanceCtrl : MonoBehaviour
{
    public Text3DCtrl Text3D_distance;
 
    public Transform rulerMesh;
    // Start is called before the first frame update
    void Start()
    {
        //Text3D_distance = this.GetComponentInChildren<Text3DCtrl>();
        Text3D_distance.SetLookTarget(Camera.main.transform);
    }

    //待测量距离的第一个位置
    public void SetFirstPos(Vector3 pos)
    {
        this.transform.position = pos;
    }

    //待测量距离的第二个位置
    public void SetSecondPos(Vector3 pos)
    {
        float distance = Vector3.Distance(this.transform.position, pos);
        this.transform.LookAt(pos);
        Vector3 localScale = rulerMesh.transform.localScale;
        localScale.z = distance / 2;
        rulerMesh.transform.localScale = localScale;
        Text3D_distance.transform.localPosition = new Vector3(0, 3, localScale.z);
        Text3D_distance?.SetName(distance.ToString("0.0"));
    }
 
}