1 using System.Collections;
  2 using System.Collections.Generic;
  3 using UnityEngine;
  4
  5 //实现代码如下：（最外层有6个点，依次5，4，3，2，1）
  6 //添加一个小球，沿曲线运动，使小球看向目标物体
  7 public class Test_DrawLine : MonoBehaviour {
  8
  9     [SerializeField] private Transform points;                          //控制点父对象
 10     private List<Transform> point_tranList = new List<Transform>();     //控制点列表
 11     [SerializeField] private int pointCount = 100;                      //曲线点的个数
 12     private List<Vector3> line_pointList;                               //曲线点列表
 13
 14     [SerializeField] private Transform lookTarget;                      //看向目标
 15     [SerializeField] private GameObject ball;                           //运动物体
 16     [SerializeField] private float time0 = 0;                           //曲线点之间移动时间间隔
 17     private float timer = 0;                    //计时器
 18     private int item = 1;                       //曲线点的索引
 19     private bool isTrue = false;
 20
 21     //使小球沿曲线运动
 22     //这里不能直接在for里以Point使用差值运算，看不到小球运算效果
 23     //定义一个计时器，在相隔时间内进行一次差值运算。
 24     void Awake()
 25     {
 26         Init();
 27     }
 28     void Init()
 29     {
 30         if (null != points && point_tranList.Count == 0)
 31         {
 32             foreach (Transform item in points)
 33             {
 34                 point_tranList.Add(item);
 35             }
 36         }
 37         line_pointList = new List<Vector3>();
 38         for (int i = 0; point_tranList.Count != 0 && i < pointCount; i++)
 39         {
 40             //一
 41             Vector3 pos1 = Vector3.Lerp(point_tranList[0].position, point_tranList[1].position, i / (float)pointCount);
 42             Vector3 pos2 = Vector3.Lerp(point_tranList[1].position, point_tranList[2].position, i / (float)pointCount);
 43             Vector3 pos3 = Vector3.Lerp(point_tranList[2].position, point_tranList[3].position, i / (float)pointCount);
 44             Vector3 pos4 = Vector3.Lerp(point_tranList[3].position, point_tranList[4].position, i / (float)pointCount);
 45             Vector3 pos5 = Vector3.Lerp(point_tranList[4].position, point_tranList[5].position, i / (float)pointCount);
 46
 47             //二
 48             var pos1_0 = Vector3.Lerp(pos1, pos2, i / (float)pointCount);
 49             var pos1_1 = Vector3.Lerp(pos2, pos3, i / (float)pointCount);
 50             var pos1_2 = Vector3.Lerp(pos3, pos4, i / (float)pointCount);
 51             var pos1_3 = Vector3.Lerp(pos4, pos5, i / (float)pointCount);
 52             //三
 53             var pos2_0 = Vector3.Lerp(pos1_0, pos1_1, i / (float)pointCount);
 54             var pos2_1 = Vector3.Lerp(pos1_1, pos1_2, i / (float)pointCount);
 55             var pos2_2 = Vector3.Lerp(pos1_2, pos1_3, i / (float)pointCount);
 56             //四
 57             var pos3_0 = Vector3.Lerp(pos2_0, pos2_1, i / (float)pointCount);
 58             var pos3_1 = Vector3.Lerp(pos2_1, pos2_2, i / (float)pointCount);
 59             //五
 60             Vector3 find = Vector3.Lerp(pos3_0, pos3_1, i / (float)pointCount);
 61
 62             line_pointList.Add(find);
 63         }
 64         if (line_pointList.Count == pointCount)
 65             isTrue = true;
 66     }
 67
 68     void Update()
 69     {
 70         if (!isTrue)
 71             return;
 72         timer += Time.deltaTime;
 73         if (timer > time0)
 74         {
 75             timer = 0;
 76             if(item >= line_pointList.Count-10)
 77             {
 78                 ball.transform.LookAt(line_pointList[item]);
 79             }
 80             else
 81             {
 82                 if (lookTarget)
 83                     ball.transform.LookAt(lookTarget);
 84                 else
 85                     ball.transform.LookAt(line_pointList[item]);
 86             }
 87             ball.transform.localPosition = Vector3.Lerp(line_pointList[item - 1], line_pointList[item], 1f);
 88             item++;
 89             if (item >= line_pointList.Count)
 90                 item = 1;
 91         }
 92     }
 93
 94     //------------------------------------------------------------------------------
 95     //在scene视图显示
 96     void OnDrawGizmos()//画线
 97     {
 98         Init();
 99         Gizmos.color = Color.yellow;
100         for (int i = 0; i < line_pointList.Count - 1; i++)
101         {
102             Gizmos.DrawLine(line_pointList[i], line_pointList[i + 1]);
103         }
104     }
105
106 }