（3）矩形坐标反转函数

void CRectGraph::RectCoordinateReversal()

{

    long lTx,lTy;

    if ((m_Rect.left>m_Rect.right)&&(m_Rect.top>m_Rect.bottom))//在顶点处反转

    {

        lTx = m_Rect.left;

        m_Rect.left = m_Rect.right;

        m_Rect.right = lTx;

        lTy = m_Rect.top;

        m_Rect.top = m_Rect.bottom;

        m_Rect.bottom = lTy;

    }

    if (m_Rect.left>m_Rect.right)//左右反转

    {

        lTx = m_Rect.left;

        m_Rect.left = m_Rect.right;

        m_Rect.right = lTx;

    }

    if (m_Rect.top>m_Rect.bottom)//上下反转

    {      

        lTy = m_Rect.top;

        m_Rect.top = m_Rect.bottom;

        m_Rect.bottom = lTy;

    }

}

（4）加载光标资源函数

void CRectGraph::RectAddCurResourse(CPoint point)

{

    long lRet = JudgePositionInRect(point);

    if ((lRet==SUBWIN_UP)||(lRet==SUBWIN_DOWN))

    {

        SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENS));

    }

    if ((lRet==SUBWIN_LEFT)||(lRet==SUBWIN_RIGHT))

    {

        SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZEWE));

    }

    if ((lRet==SUBWIN_WN)||(lRet==SUBWIN_ES))

    {

        SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENWSE));

    }

    if ((lRet==SUBWIN_NE)||(lRet==SUBWIN_SW))

    {

        SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZENESW));

    }

    if (lRet==SUBWIN_IN)

    {

        SetCursor(AfxGetApp()->LoadStandardCursor(IDC_SIZEALL));

    }

}