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

public class huaxian : MonoBehaviour 
{

private GameObject clone;
private LineRenderer line;
int i;

//帶有LineRender物體
public GameObject target;

void Start()
{
  Debug.Log("請開始寫字");
} 

// Update is called once per frame 
 void Update()
{
  if (Input.GetMouseButtonDown(0))
  {
    //實例化對象 
    clone = (GameObject)Instantiate(target, target.transform.position, Quaternion.identity);
    //獲得該物體上的LineRender組件 
    line = clone.GetComponent<LineRenderer>();
    //設(shè)置起始和結(jié)束的顏色 
    line.SetColors(Color.red, Color.blue);
    //設(shè)置起始和結(jié)束的寬度  
    line.SetWidth(0.2f, 0.1f);
    //計數(shù)  
    i = 0;
  }
   if (Input.GetMouseButton(0))
  {
    //每一幀檢測，按下鼠標(biāo)的時間越長，計數(shù)越多 
    i++;
    //設(shè)置頂點數(shù) 
    line.SetVertexCount(i);
    //設(shè)置頂點位置(頂點的索引，將鼠標(biāo)點擊的屏幕坐標(biāo)轉(zhuǎn)換為世界坐標(biāo)) 
    line.SetPosition(i - 1, Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 15)));
  }
 }
 
}