/// <summary>
/// Constructor.
/// </summary>
/// <param name="gesture">The Gesture to recognize.</param>
/// <param name="skeleton">The skeleton that had the gesture in it</param>
public GestureRecognizer(Gesture gesture, Skeleton skeleton)
{
Gesture = gesture;
CurrentPoseIndex = -1;
InvalidFrameCount = 0;
InitialAnchorPosition = skeleton.Joints[gesture.AnchorJoint].Position;
UpdateArmLength(skeleton);
}
void recognizer_Recognized(object sender, PoseEventArgs e)
{
string[] poses = e.Poses;
HashSet<GestureRecognizer> toAdd = new HashSet<GestureRecognizer>();
// Find gestures that start with this pose
foreach (Gesture g in Gestures)
{
if (poses.Contains(g.PoseList[0]))
{
GestureRecognizer existing = ActiveGestures.Find((GestureRecognizer gr) => { return gr.Gesture == g && gr.CurrentPoseIndex <= 0; });
if (existing != null)
{
existing.UpdatedTime = DateTime.Now.Ticks;
}
else
{
GestureRecognizer gr = new GestureRecognizer(g, e.Skeleton);
toAdd.Add(gr);
}
}
}
HashSet<GestureRecognizer> toRemove = new HashSet<GestureRecognizer>();
// Evaluate Active Gestures
foreach (GestureRecognizer gr in ActiveGestures)
{
// If a gesture was recognized
if (gr.EvaluatePose(poses, e.Skeleton))
{
if (gr.Gesture.IsMirror(LastGesture))
{
toRemove.Add(gr);
long now = DateTime.Now.Ticks;
if (gr.UpdatedTime - LastGestureTime <= MIRROR_DETECT_DELAY)
{
continue;
}
}
// Clear all active gestures
ActiveGestures.Clear();
// Calculate gesture speed
double distance = CalculateDistance(gr.FinalAnchorPosition, gr.InitialAnchorPosition);
long age = DateTime.Now.Ticks - gr.CreatedTime;
//double speed = Math.Sqrt(distance / (age/15000000.0))*2.0;
//Console.WriteLine("Age:\t{0}\nSpeed:\t{1}\nRatio:\t{2}\n\n", age, speed, distance/gr.SkeletonHeight);
double speed = 3.0 * (distance / gr.SkeletonHeight);
// Trigger event
LastGesture = gr.Gesture;
LastGestureTime = DateTime.Now.Ticks;
OnGestureDetected(gr.Gesture, speed);
break;
}
else if (gr.Expired)
{
toRemove.Add(gr);
}
else if (gr.InvalidFrameCount >= MAX_INVALID_FRAMES)
{
toRemove.Add(gr);
if (gr.Gesture == LastGesture || gr.Gesture.IsMirror(LastGesture))
{
LastGesture = null;
}
}
}
ActiveGestures.RemoveAll((GestureRecognizer gr) => { return toRemove.Contains(gr); });
ActiveGestures.AddRange(toAdd);
}
/// <summary>
/// Detects if a gesture has the exact opposite pose list as this one
/// </summary>
/// <param name="g">Gesture to check</param>
/// <returns>True if the gesture is an exact mirror of this one</returns>
public bool IsMirror(Gesture g)
{
if (g == null || g.PoseList.Length != this.PoseList.Length)
{
return false;
}
int length = g.PoseList.Length;
for (int ii = 0; ii < (length + 1) / 2; ++ii)
{
if (g.PoseList[ii] != this.PoseList[length - ii - 1])
{
return false;
}
}
return true;
}
/// <summary>
/// When a Gesture is recognized, fire the GestureDetected event.
/// </summary>
/// <param name="g">The recognized Gesture.</param>
private void OnGestureDetected(Gesture g, double executionSpeedRatio)
{
if (GestureDetected != null)
{
GestureDetected(this, new GestureEventArgs(g.Name, executionSpeedRatio));
}
}
