陀螺仪控制相机运动

有时候我们需要通过陀螺仪控制相机的运动。这里有个demo供大家参考

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
/*
 * Author:W
 * 陀螺仪控制相机
 */
public class GvrScopeCtrl : MonoBehaviour {
	public Transform cameraTran;
	public Button resetBtn;
	public Button switchBtn;

	private bool isGvrEnable = false;

	private  Vector3 CurEuler;




	/// <summary>
	/// 陀螺仪输入类型
	/// </summary>
	public enum EGyroInputType
	{
		RotateRate,
		RotateRateUniased,
		UserAcceleration,
	}

	/// <summary>
	/// 陀螺仪数据的更新频率 
	/// </summary>
	public int gvrRate = 30;

	/// <summary>
	/// 陀螺仪的输入参数，用以控制相机 
	/// </summary>
	public Vector3 gyroInput = Vector3.zero;

	/// <summary>
	/// 陀螺仪的输入参数，用以控制相机 
	/// </summary>
	protected Vector3 GyroInput
	{
		get
		{
			return gyroInput;
		}
		set
		{
			gyroInput = value;
		}
	}


	/// <summary> 
	/// 当前陀螺仪的输入输入类型
	/// </summary>
	public EGyroInputType gyroInputType = EGyroInputType.RotateRate;

	/// <summary> 陀螺仪输入数据的类型 </summary>
	protected EGyroInputType GyroInputType
	{
		get
		{
			return gyroInputType;
		}
		set
		{
			gyroInputType = value;
		}
	}


	///  <summary>
	/// 陀螺仪的系数 
	/// </summary>
	public float gyroFactor = 1.0f;

	/// <summary> 
	/// 陀螺仪的系数 
	/// </summary>
	protected float GyroFactor
	{
		get
		{
			return gyroFactor;
		}
		set
		{
			gyroFactor = value;
		}
	}

	// Use this for initialization
	void Start () {

		isGvrEnable = false;

		resetBtn.onClick.AddListener(OnResetBtnClick);
		switchBtn.onClick.AddListener(OnSwitchBtnClick);
		
	}

	void OnDestroy()
	{
		resetBtn.onClick.RemoveListener(OnResetBtnClick);
		switchBtn.onClick.RemoveListener(OnSwitchBtnClick);
	}

	/// <summary>
	/// 相机位置重置
	/// </summary>
	private void OnResetBtnClick()
	{
		CurEuler = Vector3.zero;
		cameraTran.transform.rotation = Quaternion.Euler(CurEuler);
	}

	/// <summary>
	/// 陀螺仪开启或禁用
	/// </summary>
	private void OnSwitchBtnClick()
	{
		isGvrEnable = !isGvrEnable;

		SetGyroScope(isGvrEnable);
	}


	/// <summary>
	/// 陀螺仪的开启与关闭
	/// </summary>
	/// <param name="isEnable"></param>
	private void SetGyroScope(bool isEnable)
	{
		if (isEnable)
		{
			//Debug.Log("NakeEye SetGyroScope 陀螺仪的开启");
			Input.gyro.enabled = true;
			CurEuler = cameraTran.transform.rotation.eulerAngles;
		}
		else
		{
			//Debug.Log("NakeEye SetGyroScope 陀螺仪的关闭");
			Input.gyro.enabled = false;
		}
	}


	/// <summary> 
	/// 更新陀螺仪数据，并计算出相应的控制数据 
	/// </summary>
	protected Vector3 SetGyrScopeType(EGyroInputType eGyroInputType)
	{
		Vector3 gyroInput = Vector3.zero;

		// 更新陀螺仪数据，并计算出控制变量
		switch (eGyroInputType)
		{ //手机上左倾斜x是负值，又倾斜x是正值。上倾斜y是负值，下倾斜y是正值
			case EGyroInputType.RotateRate:
				gyroInput = Input.gyro.rotationRate;
				break;
			case EGyroInputType.RotateRateUniased:
				gyroInput = Input.gyro.rotationRateUnbiased;
				break;
			case EGyroInputType.UserAcceleration:
				gyroInput = Input.gyro.userAcceleration;
				break;
			default:
				Debug.LogError("GyroInputTypeNot defined: " + GyroInputType);
				break;
		}

		return gyroInput;
	}


	/// <summary> 更新相机的行为 </summary>
	protected void UpdateCamera()
	{
		// 不需要gyro的z参数
		Vector3 t_gyro_input = new Vector3(-GyroInput.x, -GyroInput.y, 0);

		//Debug.Log("NakeEye 陀螺仪状态：Input.gyro.rotationRate" + Input.gyro.rotationRate+ "  Input.gyro.rotationRateUnbiased="+ Input.gyro.rotationRateUnbiased
		//    + " Input.gyro.userAcceleration "+ Input.gyro.userAcceleration);

		//Debug.Log("NakeEye 陀螺仪控制UICamera运动 input = "+ t_gyro_input+"  相机 CurEuler="+ CurEuler);

		CurEuler += t_gyro_input;

		cameraTran.transform.rotation = Quaternion.Euler(CurEuler);
	}

	// Update is called once per frame
	void Update () {

		if (isGvrEnable)
		{
			// 设置陀螺仪更新频率
			Input.gyro.updateInterval = 1.0f / gvrRate;

			// 根据陀螺仪计算相机的控制数据
			GyroInputType = EGyroInputType.RotateRate;
			GyroInput = SetGyrScopeType(GyroInputType);
			// 因值不确定范围，需增加系数控制
			GyroInput = GyroInput * GyroFactor;

			// 根据控制数据，对相机进行操作和变化
			UpdateCamera();
		}

	}
}