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

public?class?Compass?:?MonoBehaviour
{
????public?GameObject?camera;?????????? //3D場景中需要旋轉的物體
????public?Transform?compassSprite;???? //指北針的UI圖片
????private?float?cameraLastEular;????? //攝像機上一幀的歐拉旋轉
????private?float?cameraCurrentEular;?? //攝像機當前幀的歐拉旋轉
????private?float?cameraEularValue;???? //攝像機的歐拉旋轉值
????private?float?compassEularValue;??? //指北針的歐拉旋轉值
????public?int?frameCount=0;????????????//幀的數量
????public?int?frameNumber?=?10;????????//每秒10幀
????public??float?timer;????????????????//計時器
????
????void?FixedUpdate?()
????{
????????cameraEularValue?=?camera.transform.eulerAngles.y;
????????compassEularValue?=?compassSprite.transform.eulerAngles.z;
????????compassEularValue?=?-cameraEularValue;
????????LookNorth();
????}

????void?LookNorth()
????{
????????//上一幀，上一旋轉角度????? **********這里必須為歐拉角，錯誤代碼為下面寫法************
????????cameraLastQua?=?camera.transform.eulerAngles.y;

????????timer?+=?Time.deltaTime;
????????//判斷時間>=一秒/每秒執行的幀數
????????if?(timer?>=?1.0f?/?frameNumber)
????????{
????????????//幀的數量在增加
????????????frameCount++;
????????????timer?-=?1.0f?/?frameNumber;
????????????//下一幀，當前旋轉角度
????????????cameraCurrentQua?=?camera.transform.eulerAngles.y;
????????}

????????//判斷上一幀的旋轉角度和當前幀的旋轉角度是否一樣，讓指北針圖片進行旋轉

????????if?(cameraCurrentQua?!=?cameraLastQua)

????????{

??????????? //當前旋轉角度小于0? 和? 上一幀旋轉角度小于等于0

????????????if?(cameraCurrentEular<0.0f?&&?cameraLastEular<=0.0f)

????????????{

??????????????? //如果當前角度小于上一幀角度

????????????????if?(cameraCurrentEular?<?cameraLastEular)

????????????????{

??????????????????? //指北針使用歐拉角進行旋轉

????????????????????compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?-compassEularValue);
????????????????}
????????????????else

????????????????{

??????????????????? //最后面乘-1是避免會出現正的角度

????????????????????compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?compassEularValue*-1);
????????????????}
????????????}

????????????if?(cameraCurrentEular>0.0f?&&?cameraLastEular>=0.0f)
????????????{
????????????????if?(cameraCurrentEular?>?cameraLastEular)
????????????????{
????????????????????compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?compassEularValue*-1);
????????????????}
????????????????else
????????????????{
????????????????????compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?-compassEularValue);
????????????????}
????????????}
????????}

????}

????/*?? 這段代碼是錯誤的
????void?LookNorth()
????{

????????//上一幀，上一旋轉角度
????????cameraLastQua?=?camera.transform.rotation;

????????timer?+=?Time.deltaTime;
????????//判斷
????????if?(timer?>=?1.0f/frameNumber)
????????{
????????????//幀的數量在增加
????????????frameCount++;
????????????timer?-=?1.0f?/?frameNumber;
????????????//下一幀，當前旋轉角度
????????????cameraCurrentQua?=?camera.transform.rotation;
????????}

????????//判斷上一幀的旋轉角度和當前幀的旋轉角度是否一樣，讓指北針圖片進行旋轉
????????if?(cameraCurrentQua?!=?cameraLastQua)
????????{
????????????if?(cameraLastQua.y>0.0f?&&?cameraCurrentQua.y>0.0f)
????????????{
????????????????if?(cameraCurrentQua.y?>?cameraLastQua.y)
????????????????{
????????????????????compassSprite.transform.Rotate(0.0f,?0.0f,?compassRotateValue);
????????????????????//compassSprite.transform.localRotation?=?Quaternion.Euler(0.0f,?0.0f,?compassRotateValue);
????????????????????//compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?compassRotateValue);
????????????????}
????????????????else
????????????????{
????????????????????compassSprite.transform.Rotate(0.0f,?0.0f,?-compassRotateValue);
????????????????????//compassSprite.transform.localRotation?=?Quaternion.Euler(0.0f,?0.0f,?-compassRotateValue);
????????????????????//compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?-compassRotateValue);
????????????????}
????????????}

????????????if(cameraLastQua.y?<?0.0f?&&?cameraCurrentQua.y?<?0.0f)
????????????{
????????????????if?(cameraCurrentQua.y?<cameraLastQua.y)
????????????????{
????????????????????compassSprite.transform.Rotate(0.0f,0.0f,compassRotateValue);
????????????????????//compassSprite.transform.localRotation?=?Quaternion.Euler(0.0f,?0.0f,?-compassRotateValue);
????????????????????//compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?-compassRotateValue);
????????????????}
????????????????else
????????????????{
????????????????????compassSprite.transform.Rotate(0.0f,?0.0f,-compassRotateValue);
????????????????????//compassSprite.transform.localRotation?=?Quaternion.Euler(0.0f,?0.0f,?compassRotateValue);
????????????????????//compassSprite.transform.eulerAngles?=?new?Vector3(0.0f,?0.0f,?compassRotateValue);
????????????????}
????????????}
????????}
????}
????*/

}

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