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

public class DrawLine : MonoBehaviour
{
    public Camera camera;
    public Material m;
    private Transform startpos;
    private Transform endpos;
    LineRenderer lineRenderer;
    // Start is called before the first frame update
    void Start()
    {
        GameObject line = new GameObject();
        line.name = "Line";
        lineRenderer = line.AddComponent<LineRenderer>();
        startpos = transform;
        endpos = transform.GetChild(0);
        line.layer = 8;
        //首尾相连
        lineRenderer.loop = true;

        //开始结束宽
        lineRenderer.startWidth = 0.02f;
        lineRenderer.endWidth = 0.02f;

        //开始结束颜色
        lineRenderer.startColor = Color.white;
        lineRenderer.endColor = Color.red;


        lineRenderer.material = m;

        //设置点
        lineRenderer.positionCount = 2;
       

        //是否设置世界坐标系，即是否随对象移动而移动
        lineRenderer.useWorldSpace = false;

        //让线段受光的影响，会接收光的数据进行着色器计算
        lineRenderer.generateLightingData = true;
    }

    // Update is called once per frame
    void Update()
    {
        lineRenderer.SetPosition(0, startpos.position);
        lineRenderer.SetPosition(1, endpos.position);
        endpos.LookAt(camera.transform);
    }
    public void HideLine()
    {
        lineRenderer.enabled = false;
    }
    public void ShowLine()
    {
        lineRenderer.enabled = true;
    }
}