private void TrackWave(Skeleton skeleton, bool isLeft, ref WaveGestureTracker tracker, long timestamp)
{
JointType handJointId = (isLeft) ? JointType.HandLeft : JointType.HandRight;
JointType elbowJointId = (isLeft) ? JointType.ElbowLeft : JointType.ElbowRight;
Joint hand = skeleton.Joints[handJointId];
Joint elbow = skeleton.Joints[elbowJointId];
if (hand.TrackingState != JointTrackingState.NotTracked && elbow.TrackingState != JointTrackingState.NotTracked)
{
if (tracker.State == WaveGestureState.InProgress && tracker.Timestamp + WAVE_MOVEMENT_TIMEOUT < timestamp)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
System.Diagnostics.Debug.WriteLine("Fail!");
}
else if (hand.Position.Y > elbow.Position.Y)
{
//center position (0, 0)
if (hand.Position.X <= elbow.Position.X - WAVE_THRESHOLD)
{
tracker.UpdatePosition(WavePosition.Left, timestamp);
}
else if (hand.Position.X >= elbow.Position.X + WAVE_THRESHOLD)
{
tracker.UpdatePosition(WavePosition.Right, timestamp);
}
else
{
tracker.UpdatePosition(WavePosition.Neutral, timestamp);
}
if (tracker.State != WaveGestureState.Success && tracker.IterationCount == REQUIRED_ITERATIONS)
{
tracker.UpdateState(WaveGestureState.Success, timestamp);
System.Diagnostics.Debug.WriteLine("Success!");
if (GestureDetected != null)
{
GestureDetected(this, new EventArgs());
}
}
}
else
{
if (tracker.State == WaveGestureState.InProgress)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
System.Diagnostics.Debug.WriteLine("Fail!");
}
else
{
tracker.Reset();
}
}
}
else
{
tracker.Reset();
}
}
private void TrackWave(Skeleton skeleton, bool isLeft, ref WaveGestureTracker tracker, long timestamp)
{
JointType handJointId = (isLeft) ? JointType.HandLeft : JointType.HandRight;
JointType elbowJointId = (isLeft) ? JointType.ElbowLeft : JointType.ElbowRight;
Joint hand = skeleton.Joints[handJointId];
Joint elbow = skeleton.Joints[elbowJointId];
if (hand.TrackingState != JointTrackingState.NotTracked && elbow.TrackingState != JointTrackingState.NotTracked)
{
if (tracker.State == WaveGestureState.InProgress && tracker.Timestamp + WAVE_MOVEMENT_TIMEOUT < timestamp)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
System.Diagnostics.Debug.WriteLine("Fail!");
}
else if (hand.Position.Y > elbow.Position.Y)
{
//Using the raw values where (0, 0) is the middle of the screen. From the user's perspective, the X-Axis grows more negative left and more positive right.
if (hand.Position.X <= elbow.Position.X - WAVE_THRESHOLD)
{
tracker.UpdatePosition(WavePosition.Left, timestamp);
}
else if (hand.Position.X >= elbow.Position.X + WAVE_THRESHOLD)
{
tracker.UpdatePosition(WavePosition.Right, timestamp);
}
else
{
tracker.UpdatePosition(WavePosition.Neutral, timestamp);
}
if (tracker.State != WaveGestureState.Success && tracker.IterationCount == REQUIRED_ITERATIONS)
{
tracker.UpdateState(WaveGestureState.Success, timestamp);
System.Diagnostics.Debug.WriteLine("Success!");
if (GestureDetected != null)
{
GestureDetected(this, new EventArgs());
}
}
}
else
{
if (tracker.State == WaveGestureState.InProgress)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
System.Diagnostics.Debug.WriteLine("Fail!");
}
else
{
tracker.Reset();
}
}
}
else
{
tracker.Reset();
}
}
private void TrackWave(SkeletonWrapper skeleton, int userID, ref WaveGestureTracker tracker, long timestamp)
{
// The check for a user wave in this implementation is fairly simple. If the user raises their hand directly above their
// shoulder then they are merely primed for a wave. If they raise it above and to the left or right of their shoulder,
// or if they move that hand left or right after having primed it, then we count that as a wave. For such an implementation
// the WaveGestureState is not genuinley necessary however if we choose to change our approach (eg, require three motions to
// constitute a valid wave) then the use of this struct will render these changes much simpler.
// Retrieve the relevent hand and shoulder for the user depending on which hand/shoulder pair that we
// are checking for a wave.
Joint leftHand = skeleton.getLeftHandJoint();
Joint rightHand = skeleton.getRightHandJoint();
Joint centerOfShoulders = skeleton.getCenterShoulderJoint();
// Metric measurement
double distanceBetweenHandsSq = (Math.Pow(leftHand.Position.X - rightHand.Position.X, 2) + Math.Pow(leftHand.Position.Y - rightHand.Position.Y, 2));
// If the user joints are tracked...
if (leftHand.TrackingState == JointTrackingState.Tracked && rightHand.TrackingState == JointTrackingState.Tracked)
{
// If the user is not taking forever...
if (tracker.State == WaveGestureState.InProgress && tracker.Timestamp + WAVE_MOVEMENT_TIMEOUT < timestamp)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
}
// If the user's hands are overlapping...
else if (distanceBetweenHandsSq <= HAND_DISTANCE_THRESHHOLD_SQ)
{
// If the user is waving to the left...
// (We assume that, through the act of overlapping their hands, users will naturally center their hands over their torso.)
if (leftHand.Position.X < (centerOfShoulders.Position.X + WAVE_THRESHOLD))
{
tracker.UpdatePosition(WavePosition.Left, timestamp);
}
// Check if the user is waving to the right...
else if (leftHand.Position.X > (centerOfShoulders.Position.X - WAVE_THRESHOLD))
{
tracker.UpdatePosition(WavePosition.Right, timestamp);
}
else
{
tracker.UpdatePosition(WavePosition.Neutral, timestamp);
} // end if-else if-else
// If the user has not yet achieved a wave but have satisfied the number of wave iterations...
if (tracker.State != WaveGestureState.Success && tracker.IterationCount == REQUIRED_ITERATIONS)
{
// Then they're waving.
tracker.UpdateState(WaveGestureState.Success, timestamp);
// If we have observers...
if (GestureDetected != null)
{
// Notify them and let them know which direction the user waved and with which hand they waved.
GestureDetected(this, new WaveGestureEventArgs(userID));
} // end if
} // end if
}
else
{
if (tracker.State == WaveGestureState.InProgress)
{
tracker.UpdateState(WaveGestureState.Failure, timestamp);
}
else
{
tracker.Reset();
} // end if-else
} // end if-else if-else
} // end if
}
