CDC dcMem;
//CWindowDC screenDC(NULL);
CBitmap bitOff;
CRect rcBoundsDP(rcBounds) ;
// Convert bounds to device units.
pdc->LPtoDP(&rcBoundsDP) ;
// The bitmap bounds have 0,0 in the upper-left corner.
CRect rcBitmapBounds(0,0,rcBoundsDP.Width(),rcBoundsDP.Height());
// Create a DC that is compatible with the screen.
//if(m_dcMem
//dcMem.CreateCompatibleDC(&screenDC) ;
dcMem.CreateCompatibleDC(pdc) ;
// Create a really compatible bitmap.
bitOff.CreateCompatibleBitmap(pdc, rcBitmapBounds.Width(), rcBitmapBounds.Height());
// Select the bitmap into the memory DC.
CBitmap* pOldBitmap = dcMem.SelectObject(&bitOff) ;
dcMem.FillSolidRect(0,0, rcBitmapBounds.Width(), rcBitmapBounds.Height(),RGB(255,255,255));
// Save the memory DC state, since DrawMe might change it.
int iSavedDC = dcMem.SaveDC();
//DrawBk(&dcMem);
// Draw our control on the memory DC.
//对m_Graph对象进行绘制
pView->m_Graph.Draw(&dcMem);
//DrawGraph(&dcMem, rcBitmapBounds) ;
//DrawAnnotate(&dcMem);
//运行开始？
//DrawStartPosition(&dcMem);
// Restore the DC, since DrawMe might have changed mapping modes.
dcMem.RestoreDC(iSavedDC) ;
// We don't know what mapping mode pdc is using.
// BitBlt uses logical coordinates.
// Easiest thing is to change to MM_TEXT.
pdc->SetMapMode(MM_TEXT) ;
pdc->SetWindowOrg(0,0) ;
pdc->SetViewportOrg(0,0) ;
//贴图
// Blt the memory device context to the screen.
pdc->BitBlt( rcBoundsDP.left,
rcBoundsDP.top,
rcBoundsDP.Width(),
rcBoundsDP.Height(),
&dcMem,
0,
0,
SRCCOPY) ;
//Clean up.
dcMem.SelectObject(pOldBitmap);
