在坐标轴上添加坐标值

void zft8::OnPaint() 
{
CPaintDC dc(this); 
        CMDIFrameWnd *pFrame=(CMDIFrameWnd*)AfxGetApp()->m_pMainWnd;       
CMDIChildWnd *pChild = (CMDIChildWnd *) pFrame->GetActiveFrame();   
CTeachView   *pView =   (CTeachView*)(pChild->GetActiveView());   
CTeachDoc   *pDoc =   (CTeachDoc*)(pChild->GetActiveDocument());   
long hmax=0;                             
double rate;
int i;
for(i=0;i<256;i++)
{
if(pView->nHist[i]>=hmax)
{
hmax=pView->nHist[i];
}
}
rate=hmax/250;    
         for(i=0;i<=255;i++)
{
dc.MoveTo(40+2*i,400);
dc.LineTo(40+2*i,400-pView->nHist[i]/(int)rate);  
}
dc.MoveTo(40,400);              //画横坐标
dc.LineTo(40+2*255,400);
dc.MoveTo(40,400);              ////画纵坐标
dc.LineTo(40,0);
}
画8bit BMP的直方图，坐标轴已经画好了，怎么在坐标轴上添加坐标值啊？