unity3d手柄按鍵事件回調

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

/// <summary>
/// 定義一個按鍵類.設置手柄按鍵
/// </summary>
public class ButtonTouchAction : MonoBehaviour {
    SteamVR_TrackedObject trackdeObjec;
    void Awake() {  
        //獲取手柄上的這個組件  
        trackdeObjec = GetComponent<SteamVR_TrackedObject>();  
    } 
    // Update is called once per frame
    void FixedUpdate () {
        //獲取手柄輸入  
        SteamVR_Controller.Device device = SteamVR_Controller.Input((int)trackdeObjec.index);
        if(device.GetTouchDown(SteamVR_Controller.ButtonMask.Trigger))//按下扳機
        {
            print("真的按下扳機");
        }
        //按下圓盤鍵
        if (device.GetPress(SteamVR_Controller.ButtonMask.Touchpad))
        {
            // 獲取觸摸板上的座標
            Vector2 pad = device.GetAxis();
            // 轉換角度
            Vector3 cross = Vector3.Cross(new Vector2(1, 0), pad);
            float angle = Vector2.Angle(new Vector2(1, 0), pad);
            float ang = cross.z > 0 ? -angle : angle; 
            //根據角度來判斷上下左右四個範圍
            //下
            if (ang > 45 && ang < 135)
            {
                print("下");
            }
            //上  
            else if (ang < -45 && ang> -135)
            {
                print("上");
            }
            //左  
            else if ((ang < 180 && ang> 135) || (ang < -135 && ang > -180))
            {
                print("左");
            }
            //右  
            else if ((ang > 0 && ang< 45) || (ang > -45 && ang< 0))
            {
                print("右");
            }
        }
    }
}