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LEAPMotion VR 各种手势的判断~

Created by miccall （转载请注明出处）

1.手划向左边

        protected bool isMoveLeft (Hand hand)   // 手划向左边        {           //x轴移动的速度   deltaVelocity = 0.7f    isStationary (hand)  判断hand是否禁止             return hand.PalmVelocity.x < -deltaVelocity && !isStationary (hand);        }          [Tooltip ("Velocity (m/s) move toward ")]        protected float deltaVelocity = 0.7f;

2.手划向右边

        protected bool isMoveRight (Hand hand)// 手划向右边        {            return hand.PalmVelocity.x > deltaVelocity && !isStationary (hand);        }          [Tooltip ("Velocity (m/s) move toward ")]        protected float deltaVelocity = 0.7f;

3.手划向上边

        protected bool isMoveUp (Hand hand)   //手向上         {            return hand.PalmVelocity.y > deltaVelocity && !isStationary (hand);        } 

4.手划向下边

        protected bool isMoveDown (Hand hand) //手向下          {            return hand.PalmVelocity.y < -deltaVelocity && !isStationary (hand);        } 

5.手固定不动

        protected bool isStationary (Hand hand)// 固定不动的         {            return hand.PalmVelocity.Magnitude < smallestVelocity;        }          [Tooltip ("Velocity (m/s) move toward ")]                   //速度（m/s）走向         protected float smallestVelocity = 0.4f;   

6.是否抓取

        protected bool isGrabHand (Hand hand)  //是否抓取        {            return hand.GrabStrength > 0.8f;    //抓取力         }   

7.是否握拳

        protected bool isCloseHand (Hand hand)     //是否握拳         {            List<Finger> listOfFingers = hand.Fingers;            int count = 0;            for (int f = 0; f < listOfFingers.Count; f++) { //循环遍历所有的手~~                Finger finger = listOfFingers [f];                    if ((finger.TipPosition - hand.PalmPosition).Magnitude < deltaCloseFinger)    // Magnitude  向量的长度 。是(x*x+y*y+z*z)的平方根。                     //float deltaCloseFinger = 0.05f;                {                      count++;                                    //if (finger.Type == Finger.FingerType.TYPE_THUMB)                                   //Debug.Log ((finger.TipPosition - hand.PalmPosition).Magnitude);                }            }            return (count == 5);        }   

8.手掌是否全张开

        protected bool isOpenFullHand (Hand hand)         //手掌全展开~        {            //Debug.Log (hand.GrabStrength + " " + hand.PalmVelocity + " " + hand.PalmVelocity.Magnitude);            return hand.GrabStrength == 0;        }

9.向量的判断

（1）向量转化成 角度

protected float angle2LeapVectors (Leap.Vector a, Leap.Vector  b){           //向量转化成 角度            return Vector3.Angle (UnityVectorExtension.ToVector3 (a), UnityVectorExtension.ToVector3 (b));}

（2）判断两个向量是否 相同 方向

protected bool isSameDirection (Vector a, Vector b){            //判断两个向量是否 相同 方向            //Debug.Log (angle2LeapVectors (a, b) + " " + b);            return angle2LeapVectors (a, b) < handForwardDegree;}

（3）判断两个向量是否 相反 方向

protected bool isOppositeDirection (Vector a, Vector b      {//判断两个向量是否 相反 方向        return angle2LeapVectors (a, b) > (180 - handForwardDegree);}

（4）判断手的掌心方向于一个 向量 是否方向相同

protected bool isPalmNormalSameDirectionWith (Hand hand, Vector3 dir){      //判断手的掌心方向于一个  向量   是否方向相同     return isSameDirection (hand.PalmNormal, UnityVectorExtension.ToVector (dir));}      [Tooltip ("Delta degree to check 2 vectors same direction")]  //三角度检查2个向量的方向相同        protected float handForwardDegree = 30;

10.向手掌的方向 移动

protected bool isHandMoveForward (Hand hand)        {            return isSameDirection (hand.PalmNormal, hand.PalmVelocity) && !isStationary (hand);        }

11.手掌是否垂直（掌心水平）

        protected bool checkPalmNormalInXZPlane (Hand hand)  //   hand.PalmNormal 垂直于掌心的向量         {            float anglePalmNormal = angle2LeapVectors (hand.PalmNormal, UnityVectorExtension.ToVector (Vector3.up));            return (anglePalmNormal > 70 && anglePalmNormal < 110);        } 

12.判断大拇指是否竖直或向下

 protected bool isThumbDirection (Hand hand, Vector3 dir)        {            List<Finger> listOfFingers = hand.Fingers;            for (int f = 0; f < listOfFingers.Count; f++) {                Finger finger = listOfFingers [f];                if (finger.Type == Finger.FingerType.TYPE_THUMB) {                    float angleThumbFinger = angle2LeapVectors (finger.Direction,                                                 UnityVectorExtension.ToVector (dir));                    float angleThumbFinger2 = angle2LeapVectors (                                                 finger.StabilizedTipPosition - hand.PalmPosition, UnityVectorExtension.ToVector (dir));                    //Debug.Log (angleThumbFinger + " " + angleThumbFinger2);                    if (angleThumbFinger < deltaAngleThumb                       || angleThumbFinger2 < deltaAngleThumb)                        return true;                    else                        return false;                }             }            return false;        }

13.判断四指是否靠拢掌心

protected bool checkFingerCloseToHand (Hand hand){            List<Finger> listOfFingers = hand.Fingers;            int count = 0;            for (int f = 0; f < listOfFingers.Count; f++) {                Finger finger = listOfFingers [f];                if ((finger.TipPosition - hand.PalmPosition).Magnitude < deltaCloseFinger) {                    if (finger.Type == Finger.FingerType.TYPE_THUMB) {                        return false;                    } else {                        count++;                    }                }            }            //Debug.Log (count);            return (count == 4);}