public void SetVectorClipBox(double x1, double y1, double x2, double y2)
 {
     Reset();
     m_VectorClipper.ClipBox(m_VectorClipper.UpScale(x1), m_VectorClipper.UpScale(y1),
                             m_VectorClipper.UpScale(x2), m_VectorClipper.UpScale(y2));
 }
 void ClipBox(double x1, double y1,
              double x2, double y2)
 {
     Reset();
     _vectorClipper.ClipBox(_vectorClipper.UpScale(x1), _vectorClipper.UpScale(y1),
                            _vectorClipper.UpScale(x2), _vectorClipper.UpScale(y2));
 }