MultipagePrintDocument.cs

/*------------------------------------------------------
** OnPrintPage
** description:	This method overrides the standard
**              OnPrintPage method and implements the
**              rendering of more pages on a single
**              sheet
**
** parameters:	standard PrintPageEventArgs
**----------------------------------------------------*/
protected override void OnPrintPage(PrintPageEventArgs e)
{
  base.OnPrintPage(e);

  // set the internal unit to point to be compatible with Text Control's units
  e.Graphics.PageUnit = GraphicsUnit.Point;

  // retrieve the thumbnail rows and columns for selected number of pages
  ThumbnailGrid szThumbnailValuePair = GetThumbnailValuePair(m_pagesPerSheet);

  // set the thumbnail size (page size divided by number of cols / rows)
  SizeF szfThumbnailSize = new SizeF(
      HundredthsOfAnInchToPoint(m_paperSize.Width) / szThumbnailValuePair.Columns,
      HundredthsOfAnInchToPoint(m_paperSize.Height) / szThumbnailValuePair.Rows);

  // get the last thumbnail page that is printed on the current page
  int iLastPage = Math.Min(m_currentPage + (int)m_pagesPerSheet - 1, m_toPage);

  // iterate through the selected pages
  for (int iCurrentPage = m_currentPage; iCurrentPage <= iLastPage; iCurrentPage++) {
    // get the page from TextControl
    TXTextControl.Page txPage = m_textControl.GetPages()[iCurrentPage + 1];

    // get the current row and column
    int iCurrentColumn;
    int iCurrentRow = Math.DivRem(iCurrentPage - m_currentPage,
      szThumbnailValuePair.Columns, out iCurrentColumn);

    PointF pfThumbnailLocation = new PointF(
      iCurrentColumn * szfThumbnailSize.Width,
      iCurrentRow * szfThumbnailSize.Height);

    // create the Metafile image from current page in TextControl
    // using the Pages collection
    Metafile mfPageImage = txPage.GetImage(TXTextControl.Page.PageContent.All);

    // calculate the scale factor
    float fScaleFactor =
      (m_textControl.Sections[txPage.Section].Format.Landscape == true) ?
      (szfThumbnailSize.Width / txPage.Bounds.Width) :
      (szfThumbnailSize.Height / txPage.Bounds.Height);

    // draw the Text Control page onto the existing PrintDocument Graphics
    // at the calculated location and size
    e.Graphics.DrawImage(mfPageImage, new RectangleF(pfThumbnailLocation.X, 
      pfThumbnailLocation.Y, 
      txPage.Bounds.Width * fScaleFactor, 
      txPage.Bounds.Height * fScaleFactor));
    
    // print page borders
    if (m_drawPageBorders)
      e.Graphics.DrawRectangle(Pens.LightGray, 
        pfThumbnailLocation.X, 
        pfThumbnailLocation.Y, 
        szfThumbnailSize.Width, 
        szfThumbnailSize.Height);
  }

  // more pages?
  m_currentPage = m_currentPage + (int)m_pagesPerSheet;
  e.HasMorePages = (m_currentPage <= m_toPage);
}