ARPG中人物的鼠标点击旋转

2D 场景 ， 正交camera

场景和相机都不旋转

 

人物在init的时候， 通过外部参数设定x的旋转角度330

 

下面代码实现鼠标点击地图， 人物旋转到对应的方向上。

 

 

 

 

 

 

using UnityEngine;
using System.Collections;

public class rotate : MonoBehaviour
{
  // Use this for initialization
  public GameObject gotoSign;
  public static GameObject sign_t = null;
  private const string mapName = "Map";
  private const string mainCharacterName = "character";
  private Quaternion mainCharacterRotationInit;
  private GameObject mainCharacter;
  void Start ()
  {
    mainCharacter = GameObject.Find (mainCharacterName);
    mainCharacterRotationInit = mainCharacter.transform.rotation;
  }

  void Update ()
  {
    if (Input.GetMouseButtonDown (0)) {
        
      Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
      RaycastHit hit;
      //发出射线
      if (Physics.Raycast (ray, out hit, 500)) {
        //Debug.DrawLine (ray.origin, hit.point);
        //check if kick the map
        if (hit.transform.name == mapName) {
        
          //Debug.Log ("kick:" + Time.time);
          //清理标记
          if (sign_t) {
            Destroy (sign_t, 0);
            sign_t = null;
          }
            
          //change screen point to worldPoint    
          // can't use chinese
          Vector3 p = hit.point;// Camera.main.ScreenToWorldPoint(Input.mousePosition);

          // Instantiate new object
          sign_t = (GameObject)Instantiate (gotoSign, new Vector3 (p.x, p.y, mainCharacter.transform.position.z), gotoSign.transform.rotation);
        

          //we use always world up direction to compare with new vector
          Vector3 thePosition =    Vector3.up;
          //Debug.Log ("thePosition" + thePosition);

            
          //计算点击的点和主角位置这2点产生的向量，用来跟主角的方向求角度
          Vector3 targetDir = sign_t.transform.position - mainCharacter.transform.position;
          //Debug.Log ("targetDir" + targetDir);
          //Debug.DrawLine (sign_t.transform.position, mainCharacter.transform.position);
            
          // this is vector 叉乘
          Vector3 tempDir = Vector3.Cross (thePosition, targetDir.normalized);
          // this is vector 点乘
          float dotValue = Vector3.Dot (thePosition, targetDir.normalized);
          // 用点乘来计算夹角度
          float angle = Mathf.Acos (dotValue) * Mathf.Rad2Deg;

          if (tempDir.z>0)    
          {
            //angle must be 0~360
            angle = angle * (-1);
            angle += 360;
          }
          //Debug.Log ("tempDir" + tempDir);
          Debug.Log ("angle" + angle);
            
          // first init to Up
          mainCharacter.transform.rotation = mainCharacterRotationInit;
          // then rotate with angle
          mainCharacter.transform.Rotate(new Vector3(0,angle,0));

        }
      }
    }
    
    
  }
}