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if Printdialog1.Execute then
  begin
     printer.BeginDoc;
     form1.Canvas.Refresh;
     application.ProcessMessages;

     // scale
     w:=form1.Width; h:=form1.height;
      wp:=printer.PageWidth - 20;
      hp:=wp*h div w;

     // copy canvas to printer
     Printer.Canvas.CopyRect(
     Rect(10,50,wp,hp),
     form1.Canvas,
     Rect(page1.Left,page1.top,w+page1.Left,  
            h+page1.top));

     printer.EndDoc;
  end;                    

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PROCEDURE PrintBitmap(Canvas:  TCanvas; DestRect:  TRect;  Bitmap:  TBitmap);
  VAR
    BitmapHeader:  pBitmapInfo;
    BitmapImage :  POINTER;
    HeaderSize  :  DWORD;    // Use DWORD for D3-D5 compatibility
    ImageSize   :  DWORD;
BEGIN
  GetDIBSizes(Bitmap.Handle, HeaderSize, ImageSize);
  GetMem(BitmapHeader, HeaderSize);
  GetMem(BitmapImage,  ImageSize);
  TRY
    GetDIB(Bitmap.Handle, Bitmap.Palette, BitmapHeader^, BitmapImage^);
    StretchDIBits(Canvas.Handle,
                  DestRect.Left, DestRect.Top,     // Destination Origin
                  DestRect.Right  - DestRect.Left, // Destination Width
                  DestRect.Bottom - DestRect.Top,  // Destination Height
                  0, 0,                            // Source Origin
                  Bitmap.Width, Bitmap.Height,     // Source Width & Height
                  BitmapImage,
                  TBitmapInfo(BitmapHeader^),
                  DIB_RGB_COLORS,
                  SRCCOPY)
  FINALLY
    FreeMem(BitmapHeader);
    FreeMem(BitmapImage)
  END
END {PrintBitmap};