double Side = (m_LineSize*Delta) / 574.751953125;

    if (w + Side >= m_StartY)
        while (w + Side > m_StartY)
            m_StartY = upStep(m_StartY);
    else if (w - Side <= m_FinishY)
        while (w + Side <= m_FinishY)
            m_FinishY = downStep(m_FinishY);

    if (k + Side >= m_FinishX)
        while (k + Side > m_FinishX)
            m_FinishX = rightStep(m_FinishX);
    else if (k - Side <= m_StartX)
        while (k + Side <= m_StartX)
            m_StartX = leftStep(m_StartX);