int CVSwipeGesture::Process(CVPipeline * pipe)
{
// Check optical flow.
int points = pipe->opticalFlowPoints.Size();
Vector2f direction;
for (int i = 0; i < points; ++i)
{
OpticalFlowPoint & point = pipe->opticalFlowPoints[i];
direction += point.offset.NormalizedCopy();
}
if (points)
{
framesWithFlow++;
// std::cout<<"\nDirection: "<<direction;
}
// direction.y *= 0.5f;
direction.Normalize();
float s0 = smoothing->GetFloat();
float s1 = 1 - s0;
pointsSmoothed = pointsSmoothed * s0 + points * s1;
// std::cout<<"\nOptical flow points "<<points;
directionSmoothed = directionSmoothed * s0 + direction * s1;
// Copy swipe-state to pipeline, before changes herein occur.
pipe->swipeState = swipeState;
// State-machine style now.
switch(swipeState)
{
case SwipeState::IDLE:
{
if (pointsSmoothed > minPointsForSwipe->GetInt())
{
std::cout<<"\nSwipe starting.";
swipeStart = Time::Now();
swipeState = SwipeState::IN_SWIPE;
swipeDirections.Clear();
framesWithFlow = 0;
}
break;
}
case SwipeState::IN_SWIPE:
{
if (maxFramesToAnalyze->GetInt() <= 0 || swipeDirections.Size() < maxFramesToAnalyze->GetInt())
{
// std::cout<<"\nAdding smoothed direction: "<<directionSmoothed;
swipeDirections.Add(directionSmoothed);
}
if (pointsSmoothed < minPointsBeforeLeavingSwipe->GetInt())
{
std::cout<<"\nSwipe ending.";
swipeState = SwipeState::SWIPE_ENDED;
///
}
break;
}
case SwipeState::SWIPE_ENDED:
{
Time now = Time::Now();
int duration = (now - swipeStart).Milliseconds();
std::cout<<"\nDuration: "<<duration;
if (duration > maxSwipeDuration->GetInt() && maxSwipeDuration->GetInt() > 0)
{
std::cout<<"\nSwipe exceeded maximum duration. Ignored.";
swipeState = SwipeState::IDLE;
break;
}
if (framesWithFlow < minFramesWithFlow->GetInt())
{
std::cout<<"\nFrames not enough, skipping this swipe! o.o";
}
// Calculate average direction throughout the entire swipe-gesture.
Vector2f averageDirection;
for (int i = 0; i < swipeDirections.Size(); ++i)
{
averageDirection += swipeDirections[i];
}
averageDirection /= swipeDirections.Size();
Vector2f averageDirectionNormalized = averageDirection.NormalizedCopy();
// TODO: Check for a local extreme instead of an average?
pipe->swipeGestureDirection = averageDirectionNormalized;
/// Check direction.
std::cout<<"\nDetected swipe in direction: "<<pipe->swipeGestureDirection;
swipeState = SwipeState::IDLE;
break;
}
}
return CVReturnType::SWIPES_GESTURES;
}
