oh,i almost forget my birthday come soon

guys,this post can survived that is one of my birthday wish .

16 years,life still hard........

post some code make the post be a tech article.................

 

class CLineDrawObject : public CRectDrawObject
{
public:
    CLineDrawObject(){}
    ~CLineDrawObject(){}

    
    virtual void OnDrag()
    {
        if(NULL == m_pCanvas)
            return ;

        if(m_ptOld.x == -1){
            m_ptOld = m_ptNew;    
            return ;
        }    

        m_pCanvas->ClearTempBitmap();
        CDC* pDC = m_pCanvas->get_TempDC();
        CPen oPen(m_uLineStyle ,m_uLineWidth, m_crForegroundColor);
        CPen *pOldPen;
        
        pOldPen = pDC->SelectObject(&oPen);

        pDC->MoveTo(m_ptOld.x, m_ptOld.y);    
        pDC->LineTo(m_ptNew);
        
        pDC->SelectObject(pOldPen);

        CRect rc;
        
        
        if(m_ptOld.x < m_ptNew.x){
                rc.left = m_ptOld.x;
                rc.right = m_ptNew.x + 1;
        }
        else
        {
                rc.left = m_ptNew.x;
                rc.right = m_ptOld.x + 1;
        }

        if (m_ptOld.y < m_ptNew.y)
        {
                rc.top = m_ptOld.y;
                rc.bottom = m_ptNew.y + 1;
        }
        else
        {
                rc.top = m_ptNew.y;
                rc.bottom = m_ptOld.y + 1;
        }
    
        m_pCanvas->InvalidateRect(&rc);             
                    
    }