/**
* Detects if the skeleton is kicking
* */
private bool detectKick(HNJOINT jointype)
{
var foot = joints[(int)jointype];
var hip = joints[(int)HNJOINT.HIP_CENTER];
return(Math.Max(hip.y - foot.y, foot.y - hip.y) < .5f && Math.Max(hip.x - foot.x, foot.x - hip.x) > .3f);
}
/**
* Detects if the given hand is closed
* */
private bool isHandClosed(HNJOINT handType)
{
if (handType == HNJOINT.HAND_LEFT)
{
return(leftHand != HNHANDSTATE.HNHANDSTATE_OPEN);
}
else
{
return(rightHand != HNHANDSTATE.HNHANDSTATE_OPEN);
}
}
/**
* Detects if the given hand is open
* */
private bool isHandOpen(HNJOINT handType)
{
if (handType == HNJOINT.HAND_LEFT)
{
return(leftHand != HNHANDSTATE.HNHANDSTATE_CLOSED);
}
else
{
return(rightHand != HNHANDSTATE.HNHANDSTATE_CLOSED);
}
}
/**
* Detects if the given hand is doing the fistpump gesture
* */
private bool detectFistPump(HNJOINT handType)
{
getVerticalDisplacement(handType);
bool ishandMovingVertical;
if (handType == HNJOINT.HAND_LEFT)
{
ishandMovingVertical = (leftHandVertDelay > 0); //if moved at VERT_LARGE_DISPLACEMENT_THRESHOLD in the last MAX_VERTICAL_DELAY frames
}
else
{
ishandMovingVertical = (rightHandVertDelay > 0);
}
return(!shrug && detectHandHorizontal(handType, .1f) && isHandClosed(handType) && isHandOverElbow(handType) && ishandMovingVertical);
}
/**
* Detects if the skeleton is stepping
* */
private bool detectStep(HNJOINT jointype)
{
var knee = joints[(int)jointype];
var hip = joints[(int)HNJOINT.HIP_CENTER];
Vector3 foot;
if (jointype == HNJOINT.KNEE_LEFT)
{
foot = joints[(int)HNJOINT.FOOT_LEFT];
}
else
{
foot = joints[(int)HNJOINT.FOOT_RIGHT];
}
return((Math.Max(hip.y - knee.y, knee.y - hip.y) < .2f) && !sitting && (Math.Max(knee.x - foot.x, foot.x - knee.x) < .1f));
}
/**
* Detects if the hand is above the y of the elbow
* */
private bool isHandOverElbow(HNJOINT handType)
{
HNJOINT elbowType;
if (handType == HNJOINT.HAND_RIGHT)
{
elbowType = HNJOINT.ELBOW_RIGHT;
}
else
{
elbowType = HNJOINT.ELBOW_LEFT;
}
var hand = joints[(int)handType];
var elbow = joints[(int)elbowType];
return(hand.y > elbow.y);
}
/**
* Detects if the given hand is waving
* */
private bool detectWave(HNJOINT handType)
{
bool isHandOpened = isHandOpen(handType);
bool handOverElbow = isHandOverElbow(handType);
bool isHandWithinHorizontalBounds = detectHandHorizontal(handType, .4f);
bool isMovingHorizontal;
getHorizontalDisplacement(handType);
if (handType == HNJOINT.HAND_LEFT)
{
isMovingHorizontal = (leftHandHorizDelay > 0); //if moved at that speed in the last MAX_HORIZONTAL_DELAY frames
}
else
{
isMovingHorizontal = (rightHandHorizDelay > 0);
}
return(!shrug && handOverElbow && isHandWithinHorizontalBounds && isMovingHorizontal && isHandOpened);
}
/**
* Detects if the hand is too far from the x pos of the elbow
* */
private bool detectHandHorizontal(HNJOINT handType, float maxHorizontalDistance)
{
//float maxHorizontalDistance = .25f;
HNJOINT elbowType;
if (handType == HNJOINT.HAND_RIGHT)
{
elbowType = HNJOINT.ELBOW_RIGHT;
}
else
{
elbowType = HNJOINT.ELBOW_LEFT;
}
var hand = joints[(int)handType];
var elbow = joints[(int)elbowType];
var horizontalDifference = hand.x - elbow.x;
return((horizontalDifference < maxHorizontalDistance) && (horizontalDifference > 0 - maxHorizontalDistance));
}
/**
* Detects if any Joint is moving vertically, and returns the distance
* */
private float getVerticalDisplacement(HNJOINT jointType)
{
var joint = joints[(int)jointType];
Vector3 lastJoint;
if (lastFrameJoints.Length > 0)
{
lastJoint = lastFrameJoints[(int)jointType];
if (jointType == HNJOINT.SHOULDER_RIGHT)
{
if (rightShoulderVertDelay > 0)//if the delay is > 0, that means we've detected horiz movement
{
rightShoulderVertDelay++;
}
if (rightShoulderVertDelay > MAX_VERTICAL_DELAY)
{
rightShoulderVertDelay = 0;
}
float displacement = rightShoulderVertDisplacement;
if (Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y) < 1f)
{
displacement = Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y);
}
//if we've got displacement, then start the delay at 1
if (displacement > VERT_SMALL_DISPLACEMENT_THRESHOLD)
{
rightShoulderVertDelay = 1;
rightShoulderVertDisplacement = displacement;
}
return(displacement);
}
else if (jointType == HNJOINT.SHOULDER_LEFT)
{
if (leftShoulderVertDelay > 0)
{
leftShoulderVertDelay++;
}
if (leftShoulderVertDelay > MAX_VERTICAL_DELAY)
{
leftShoulderVertDelay = 0;
}
float displacement = leftShoulderVertDisplacement;
if (Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y) < 1f)
{
displacement = Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y);
}
//if we've got displacement, then start the delay at 1
if (displacement > VERT_SMALL_DISPLACEMENT_THRESHOLD)
{
leftShoulderVertDelay = 1;
leftShoulderVertDisplacement = displacement;
}
return(displacement);
}
else if (jointType == HNJOINT.HAND_RIGHT)
{
if (rightHandVertDelay > 0)//if the delay is > 0, that means we've detected horiz movement
{
rightHandVertDelay++;
}
if (rightHandVertDelay > MAX_VERTICAL_LARGE_DELAY)
{
rightHandVertDelay = 0;
}
float displacement = rightHandVertDisplacement;
if (Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y) < 1f)
{
displacement = Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y);
}
//if we've got displacement, then start the delay at 1
if (displacement > VERT_LARGE_DISPLACEMENT_THRESHOLD)
{
rightHandVertDelay = 1;
rightHandVertDisplacement = displacement;
}
return(displacement);
}
else if (jointType == HNJOINT.HAND_LEFT)
{
if (leftHandVertDelay > 0)
{
leftHandVertDelay++;
}
if (leftHandVertDelay > MAX_VERTICAL_LARGE_DELAY)
{
leftHandVertDelay = 0;
}
float displacement = leftHandVertDisplacement;
if (Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y) < 1f)
{
displacement = Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y);
}
//if we've got displacement, then start the delay at 1
if (displacement > VERT_LARGE_DISPLACEMENT_THRESHOLD)
{
leftHandVertDelay = 1;
leftHandVertDisplacement = displacement;
}
return(displacement);
}
return(Math.Max(joint.y - lastJoint.y, lastJoint.y - joint.y));
}
else
{
return(0);
}
}
/**
* Detects if any Joint is moving horizontally, and returns the distance
* */
private float getHorizontalDisplacement(HNJOINT jointType)
{
var joint = joints[(int)jointType];
Vector3 lastJoint;
if (lastFrameJoints.Length > 0)
{
lastJoint = lastFrameJoints[(int)jointType];
if (jointType == HNJOINT.HAND_RIGHT)
{
if (rightHandHorizDelay > 0)//if the delay is > 0, that means we've detected horiz movement
{
rightHandHorizDelay++;
}
if (rightHandHorizDelay > MAX_HORIZONTAL_DELAY)
{
rightHandHorizDelay = 0;
}
float displacement = rightHandHorizDisplacement;
if (Math.Max(joint.x - lastJoint.x, lastJoint.x - joint.x) < 1f)
{
displacement = Math.Max(joint.x - lastJoint.x, lastJoint.x - joint.x);
}
//if we've got displacement, then start the delay at 1
if (displacement > HORIZ_DISPLACEMENT_THRESHOLD)
{
rightHandHorizDelay = 1;
rightHandHorizDisplacement = displacement;
}
return(displacement);
}
else if (jointType == HNJOINT.HAND_LEFT)
{
if (leftHandHorizDelay > 0)
{
leftHandHorizDelay++;
}
if (leftHandHorizDelay > MAX_HORIZONTAL_DELAY)
{
leftHandHorizDelay = 0;
}
float displacement = leftHandHorizDisplacement;
if (Math.Max(joint.x - lastJoint.x, lastJoint.x - joint.x) < 1f)
{
displacement = Math.Max(joint.x - lastJoint.x, lastJoint.x - joint.x);
}
//if we've got displacement, then start the delay at 1
if (displacement > HORIZ_DISPLACEMENT_THRESHOLD)
{
leftHandHorizDelay = 1;
leftHandHorizDisplacement = displacement;
}
return(displacement);
}
return(Math.Max(joint.x - lastJoint.x, lastJoint.x - joint.x));
}
else
{
return(0);
}
}
