unity LineRenderer画图

using System.Collections.Generic;
using UnityEngine;

public class huatu : MonoBehaviour
{
private GameObject Go;
private LineRenderer line;
private int i;
public GameObject go;

int lint = 0;
void Start()
{

}

// Update is called once per frame
void Update()
{
    if (Input.GetMouseButtonDown(0))
    {
        //克隆出Go的个数
        lint++;
        //克隆一个带有LineRender的物体
        Go = (GameObject)Instantiate(go, go.transform.position, transform.rotation);
        //名字按个数命名
        Go.name = lint.ToString();
        //获取LineRender组件
        line = Go.GetComponent();
        //颜色
        line.SetColors(Color.blue, Color.red);
        //宽度
        line.SetWidth(0.2f, 0.1f);
        i = 0;

      //  print(lr.Count + "kjdsakljdlkjakl");
    }
    if (Input.GetMouseButton(0))
    {
      //  print(i);
        i++;
        //设置顶点数
        line.SetVertexCount(i);
        print(line.positionCount);
        //设置顶点位置
        line.SetPosition(i - 1, Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 15)));
       
    }

    if (Input.GetMouseButton(1))
    {
      //获取到最后一个
        int o = GameObject.Find(lint.ToString()).GetComponent().positionCount;
        print("kjsahdkjhask" + o);
        o--;
        //删除顶点个数
        GameObject.Find(lint.ToString()).GetComponent(). SetVertexCount(o);
        if (o<=0)
        {
            //如果顶点个数为0删除此物体
            Destroy(GameObject.Find(lint.ToString()));
            lint--;
            print(lint);
        }
    }
  
}

}