using UnityEngine;
using System.Collections;
using UnityEngine.Networking;
/// <summary>
/// 滑动检测
/// </summary>
public class ViveSwipeDetector : NetworkBehaviour {
[SerializeField]
SteamVR_TrackedObject trackedObj;
private const int mMessageWidth = 200;
private const int mMessageHeight = 64;
//X轴
private readonly Vector2 mXAxis = new Vector2(1, 0);
//Y轴
private readonly Vector2 mYAxis = new Vector2(0, 1);
//是否跟踪滑动
private bool trackingSwipe = false;
//是否检查滑动
private bool checkSwipe = false;
//消息数组,可以考虑用枚举enum
private readonly string [] mMessage = {
"",
"Swipe Left",//左滑
"Swipe Right",//右滑
"Swipe Top",//上滑
"Swipe Bottom"//下滑
};
//消息索引
private int mMessageIndex = 0;
// 滑动的角度范围参考值
private const float mAngleRange = 30;
// 用户至少滑动多少像素才能被识别成滑动
private const float mMinSwipeDist = 0.2f;
//最小的滑动速度,低于该速度则无法识别为滑动
private const float mMinVelocity = 4.0f;
//记录开始位置和结束位置
private Vector2 mStartPosition;
private Vector2 endPosition;
//滑动开始时间
private float mSwipeStartTime;
void Update () {
//获取手柄设备
var device = SteamVR_Controller.Input((int)trackedObj.index);
// GetTouchDown时可能会滑动
if ((int)trackedObj.index != -1 && device.GetTouchDown (Valve.VR.EVRButtonId.k_EButton_Axis0)) {
trackingSwipe = true;
// 记录开始时间和位置
mStartPosition = new Vector2 (device.GetAxis (Valve.VR.EVRButtonId.k_EButton_Axis0).x,
device.GetAxis (Valve.VR.EVRButtonId.k_EButton_Axis0).y);
mSwipeStartTime = Time.time;
}
// GetTouchUp时可能会滑动
else if (device.GetTouchUp (Valve.VR.EVRButtonId.k_EButton_Axis0)) {
trackingSwipe = false;
trackingSwipe = true;
checkSwipe = true;
Debug.Log ("追踪结束"+Time.time);
}
else if(trackingSwipe)
{
//结束位置
endPosition= new Vector2 (device.GetAxis (Valve.VR.EVRButtonId.k_EButton_Axis0).x,
device.GetAxis (Valve.VR.EVRButtonId.k_EButton_Axis0).y);
}
if (checkSwipe) {
checkSwipe = false;
//滑动时间
float deltaTime = Time.time - mSwipeStartTime;
//滑动向量
Vector2 swipeVector = endPosition - mStartPosition;
//滑动速度
float velocity = swipeVector.magnitude/deltaTime;
Debug.Log("滑动的速度为:"+velocity+"--"+"滑动时间为:"+deltaTime);
if (velocity > mMinVelocity &&
swipeVector.magnitude > mMinSwipeDist) {
// 如果滑动满足检测要求
swipeVector.Normalize();
//滑动的角度
float angleOfSwipe = Vector2.Dot(swipeVector, mXAxis);
angleOfSwipe = Mathf.Acos(angleOfSwipe) * Mathf.Rad2Deg;
// 检测是左滑还是右滑
if (angleOfSwipe < mAngleRange) {
OnSwipeRight();
} else if ((180.0f - angleOfSwipe) < mAngleRange) {
OnSwipeLeft();
} else {
//检测上下滑动
angleOfSwipe = Vector2.Dot(swipeVector, mYAxis);
angleOfSwipe = Mathf.Acos(angleOfSwipe) * Mathf.Rad2Deg;
if (angleOfSwipe < mAngleRange) {
OnSwipeTop();
} else if ((180.0f - angleOfSwipe) < mAngleRange) {
OnSwipeBottom();
} else {
mMessageIndex = 0;
}
}
}
}
}
void OnGUI() {
// 显示消息,方便在眼镜里面观测
GUI.Label(new Rect((Screen.width-mMessageWidth)/2,
(Screen.height-mMessageHeight)/2,
mMessageWidth, mMessageHeight),
mMessage[mMessageIndex]);
}
private void OnSwipeLeft() {
Debug.Log ("Swipe Left 左滑");
mMessageIndex = 1;
}
private void OnSwipeRight() {
Debug.Log ("Swipe right 右滑");
mMessageIndex = 2;
}
private void OnSwipeTop() {
Debug.Log ("Swipe Top 上滑");
mMessageIndex = 3;
}
private void OnSwipeBottom() {
Debug.Log ("Swipe Bottom 下滑");
mMessageIndex = 4;
}
}
