public void OnHand(HandStats hand, long timestamp)
{
if (hand.TimeVisible <= MIN_TIME_VISIBLE)
{
return;
}
float currentX = hand.PalmPosition.x;
if (float.IsNaN(lastXTriggered))
{
lastXTriggered = currentX;
return;
}
float diff = lastXTriggered - currentX;
if (Math.Abs(diff) < MIN_TRIGGER_DISTANCE)
{
return;
}
lastXTriggered = currentX;
if (diff < 0)
{
VolumeController.VolumeDown();
}
else
{
VolumeController.VolumeUp();
}
}
/// <summary>
/// Call this function whenever a valid hand is found in a frame that you want to detect gestures on
/// </summary>
/// <param name="hand">Hand to detect gestures on</param>
/// <param name="timestamp">Timestamp of the frame, in microseconds</param>
public void OnHand(HandStats hand, long timestamp)
{
bool wasMakingGesture = isMakingGesture && lastHandId == hand.Id;
isMakingGesture = isGesture(hand);
lastHandId = hand.Id;
if (!wasMakingGesture && isMakingGesture)
{
lastGestureTime = timestamp;
}
else if (!isMakingGesture)
{
if (wasMakingGesture && timestamp >= lastGestureTime + MIN_COOLDOWN_TIME)
{
lastTriggerHandId = -1;
}
return;
}
// Make sure the trigger is detected for a bit, not just random noise
if (timestamp <= lastGestureTime + MIN_DETECTION_TIME)
{
return;
}
// Don't let the same hand trigger gesture again
if (lastTriggerHandId == hand.Id)
{
return;
}
// Only trigger action at most once every second
if (timestamp <= lastActionTime + MIN_TRIGGER_DEBOUNCE)
{
return;
}
// Trigger a gesture!
lastActionTime = timestamp;
lastTriggerHandId = hand.Id;
onGesture();
}
private void frameHandler(object sender, FrameEventArgs eventArgs)
{
Frame frame = eventArgs.frame;
// Only watch for one-handed gestures
if (frame.Hands.Count != 1)
{
return;
}
var hand = new HandStats(frame.Hands[0]);
if (WindowState != WindowState.Minimized)
{
HandInfo.Text = hand.ToString();
Confidence.Text = "Confidence: " + hand.Confidence;
TimeVisible.Text = "Time visible: " + hand.TimeVisible;
PinchStrength.Text = "Pinch strength: " + hand.PinchStrength;
PinchDistance.Text = "Pinch distance: " + hand.PinchDistance;
GrabStrength.Text = "Grab strength: " + hand.GrabStrength;
PalmPosition.Text = $"Palm position: {hand.PalmPosition}";
HandYaw.Text = $"Hand yaw: {hand.Direction.Yaw}";
HandPitch.Text = $"Hand pitch: {hand.Direction.Pitch}";
HandRoll.Text = $"Hand roll: {hand.PalmNormal.Roll}";
FingerSpread.Text = "Finger spread: " + hand.AngleSum;
HandOpen.Text = $"Hand open: {hand.IsOpen}";
HandDirection.Text = $"Hand direction: {hand.Pointing}";
CurrentTime.Text = $"Current time: {frame.Timestamp}";
SameHand.Text = $"Same hand: {hand.Id == currentHand}";
HandInBounds.Text = $"In bounds: {hand.IsInBounds}";
UsingMouse.Text = $"Using mouse: {hand.IsUsingMouse}";
}
// Only use right hand
if (hand.IsLeft)
{
return;
}
if (!hand.IsInBounds || hand.IsUsingMouse)
{
currentHand = 0;
return;
}
if (hand.Id != currentHand)
{
// Play a sound to indicate a new hand was detected
waveFileReader.Position = 0;
beepUp.Play();
}
foreach (var detector in gestureDetectors)
{
detector.OnHand(hand, frame.Timestamp);
}
scrubDetector.OnHand(hand, frame.Timestamp);
currentHand = hand.Id;
}