using UnityEngine;
using System.Collections;
 
public class MoveTest : MonoBehaviour
{
  public GameObject target;  //要到達的目標 
  public float speed = 10;  //速度 
  public int rotationAngle = 60;
  private float distanceToTarget;  //兩者之間的距離 
  private bool move = true;
 
  void Start()
  {
    //計算兩者之間的距離 
    distanceToTarget = Vector3.Distance(this.transform.position, target.transform.position);
    StartCoroutine(Move());
  }
 
  IEnumerator Move()
  {
 
    while (move) //移動到目標點停止移動
    {
      Vector3 targetPos = target.transform.position;
 
      //讓始終它朝著目標 
      this.transform.LookAt(targetPos);
 
      //計算弧線中的夾角 
      float angle = Mathf.Min(1, Vector3.Distance(this.transform.position, targetPos) / distanceToTarget) * rotationAngle;
      this.transform.rotation = this.transform.rotation * Quaternion.Euler(Mathf.Clamp(-angle, -42, 42), 0, 0);
      float currentDist = Vector3.Distance(this.transform.position, target.transform.position);
      if (currentDist < 0.5f)
        move = false;
      this.transform.Translate(Vector3.forward * Mathf.Min(speed * Time.deltaTime, currentDist));
      yield return null;
    }
  }
 
 
}