Method CalcPredictionEllipse

src/Tracker/track.cpp:425–452

///
cv::RotatedRect CTrack::CalcPredictionEllipse(cv::Size_<track_t> minRadius) const
{
	// Move ellipse to velocity
	auto velocity = m_kalman.GetVelocity();
	Point_t d(3.f * velocity[0], 3.f * velocity[1]);
	
	cv::RotatedRect rrect(m_predictionPoint, cv::Size2f(std::max(minRadius.width, fabs(d.x)), std::max(minRadius.height, fabs(d.y))), 0);

	if (fabs(d.x) + fabs(d.y) > 4) // pix
	{
		if (fabs(d.x) > 0.0001f)
		{
			track_t l = std::min(rrect.size.width, rrect.size.height) / 3;

			track_t p2_l = sqrtf(sqr(d.x) + sqr(d.y));
			rrect.center.x = l * d.x / p2_l + m_predictionPoint.x;
			rrect.center.y = l * d.y / p2_l + m_predictionPoint.y;

			rrect.angle = atanf(d.y / d.x);
		}
		else
		{
			rrect.center.y += d.y / 3;
			rrect.angle = static_cast<float>(CV_PI / 2.);
		}
	}
	return rrect;
}

///
/// \brief CTrack::IsInsideArea