void CSketcherView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo) 
{	
	CScrollView::OnPrepareDC(pDC, pInfo);

    CSketcherDoc* pDoc = GetDocument();

    pDC->SetMapMode(MM_ANISOTROPIC);

    CSize DocSize = pDoc->GetDocSize();

    // y_extent must be negative because we wan
    // notional MM_LOENGLISH
    DocSize.cy = -DocSize.cy;

    pDC->SetWindowExt(DocSize);

    // Get number of pixels per inch in x and y
    int xLogPixels = pDC->GetDeviceCaps(LOGPIXELSX);
    int yLogPixels = pDC->GetDeviceCaps(LOGPIXELSY);

    // Calculate the viewport extent in x and y
    int xExtent = DocSize.cx * m_Scale * xLogPixels/100;
    int yExtent = DocSize.cy * m_Scale * yLogPixels/100;

    pDC->SetViewportExt( xExtent, -yExtent );
}