using System.Collections;
using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// 導航UI控制類
/// </summary>
public class GuideUICtl : MonoBehaviour
{
public Transform m_target; //指向目標
public RectTransform m_arrow; //UI箭頭
// Update is called once per frame
void Update() {
//控制導航UI箭頭旋轉
Vector3 euler = m_arrow.eulerAngles;
euler.z = GetGuideUIAngle();
m_arrow.eulerAngles = euler;
}
/// <summary>
/// 獲得導航UI旋轉角度
/// </summary>
/// <returns></returns>
private float GetGuideUIAngle() {
//腳本掛置在玩家上
//以玩家前方的單位向量爲起始
Vector3 from = this.transform.forward;
//求出目標點與玩家之間的向量
Vector3 to = m_target.position - this.transform.position;
//求出兩向量之間的叉乘
Vector3 cross = Vector3.Cross(from, to);
//求出兩向量之間的角度
float angle = Vector3.Angle(from, to);
//根據叉乘求出帶符號的角度
//cross.y > 0:目標向量位於起始向量右側
//cross.y < 0:目標向量位於起始向量左側
angle = cross.y > 0 ? -angle : angle;
return angle;
}
}
效果:
源程序:
鏈接:https://pan.baidu.com/s/1YCjimtROinf7yoXvzSCT0A
提取碼:se2w