gistfile1.txt

    qreal a = mat.at<double>(0,0);
    qreal b = mat.at<double>(1,0);
    qreal c = mat.at<double>(0,1);
    qreal d = mat.at<double>(1,1);
    qreal e = mat.at<double>(0,2);
    qreal f = mat.at<double>(1,2);

    m_sx = sqrt(a * a + b * b);
    m_sy = sqrt(c * c + d * d);
    m_dx = e;
    m_dy = f;

    if (a * d - c * b < 0) {
        if (a < d) {
            m_sx = -m_sx;
        } else {
            m_sy = -m_sy;
        }
    }