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

public class DrawLine_ZH : MonoBehaviour
{
 private GameObject _Clone;
 private LineRenderer _Line;
 int _Number;

 //帶有LineRender物體
 [Header("LineRender預制體")]
 public GameObject _Target;

 void Update()
 {
  if (Input.GetMouseButtonDown(0))
  {
   //實例化對象
   _Clone = Instantiate(_Target, _Target.transform.position, Quaternion.identity);

   //獲得該物體上的LineRender組件
   _Line = _Clone.GetComponent<LineRenderer>();

   //設置起始和結束的顏色
   //_Line.SetColors(Color.red, Color.blue);
   _Line.startColor = Color.red;
   _Line.endColor = Color.blue;

   //設置起始和結束的寬度
   // _Line.SetWidth(0.2f, 0.1f);
   _Line.startWidth = 0.2f; ;
   _Line.endWidth = 0.1f;

   //計數
   _Number = 0;
  }
  if (Input.GetMouseButton(0))
  {
   //每一幀檢測，按下鼠標的時間越長，計數越多
   _Number++;

   //設置頂點數
   //_Line.SetVertexCount(_Number);
   _Line.positionCount = _Number;

   //設置頂點位置(頂點的索引，將鼠標點擊的屏幕坐標轉換為世界坐標)
   _Line.SetPosition(_Number - 1, Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 15)));


  }

  //清除繪畫

  if (Input.GetMouseButtonDown(1))
  {
   GameObject[] _Draw = GameObject.FindGameObjectsWithTag("DarwLine");
   for (int i = 0; i < _Draw.Length; i++)
   {
    Destroy(_Draw[i]);
   }
  }

 }
}