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Re: Printing a control

From:
=?Utf-8?B?U2F1bDc3NQ==?= <Saul775@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 23 May 2007 07:44:02 -0700
Message-ID:
<495ABA9B-01C7-4608-A9CD-367FD5A0760A@microsoft.com>
Thanks, Joe! You're a true help as usual.

Saul775

"Joseph M. Newcomer" wrote:

I still don't see why a bitmap is required. If you have an image list, you can just as
easily draw the bitmaps without doing everything in a bitmap!

Note that a bitmap representation of a control has to be in terms of the printer bitmap.
So a control that is 4" square would require 4800x4800 pixels to print, clearly out of
line. Why use 69,120,000 bytes to represent a 4" wide image when you can do it for an
infinitesimal fraction of that size?

Look at the SHOWDIB example in the MSDN or download my essay on screen capture from my MVP
Tips site. My example is extracted from the SHOWDIB code. Using it you should be able to
print without using an intermediate bitmap.
                        joe

On Tue, 22 May 2007 07:28:01 -0700, Saul775 <Saul775@discussions.microsoft.com> wrote:

I -- unfortunately -- need to use a bitmap. What I did not mention is that I
am getting the image list of the control as well. The list control is a
legend to another print out. It identifies shapes and colors on the other
print out.

Once I get the image list, I draw to the DC using DrawIndirect()...

CImageList *pImageList = m_ListBox.GetImageList(LVSIL_SMALL);

CString strItem;

LVITEM lvItem;
memset(&lvItem, 0, sizeof(lvItem));

****
LVITEM lvItem = {0};
or
::ZeroMemory(&lvItem, sizeof(lvItem)

memset is so retro!
****

lvItem.mask = LVIF_IMAGE | LVIF_TEXT;
lvItem.pszText = strItem.GetBuffer(256);
lvItem.cchTextMax = 256;

int nVertIndex = 0;
for (int i = 0; i < m_ListBox.GetItemCount(); i++)
{
 lvItem.iItem = i;
 m_ListBox.GetItem(&lvItem);
 pImageList->DrawIndirect(&memDC, lvItem.iImage, CPoint(0, nVertIndex),

****
So why can't you just draw this into a printer DC? Should work just fine! I do this
already in several apps, and I've never needed a bitmap to print to!

See my essay on printing bitmaps. I developed that essay based on the need to print
bitmaps, but all I do is print the (scaled) imagelist element and print the text next to
it. You don't need to reduce everything to bitmap mush because you have a few bitmaps to
print!
*****

CSize(16, 16), CPoint(0, 0));

 nVertIndex += 16;
 ...
}

Saul775

"Joseph M. Newcomer" wrote:

On Mon, 21 May 2007 13:42:02 -0700, Saul775 <Saul775@discussions.microsoft.com> wrote:

Hello, everyone. I'm wondering if you could assist me in my endeavor to
print the contents of a list box.

I have my list box with about twenty or so items in it. I would send it a
simple WM_PRINT, but the number of items VISIBLE is less than the actual
number of items in the list box, so a scrollbar is inserted into the control;
therefore, when printing, items will be missing.

When I print the contents of the list box, I want it to encompass the ENTIRE
printable area of the sheet of paper; I do not care if it's ANISOTROPIC or
ISOTROPIC. I've tried many ways to print the contents, but all my methods
seems to fail. What's plaguing me is the scaling; I'm having problems with
scaling the image -- sometimes its too small and other times it's too large,
truncating the image. Any help would be much appreciated.

I will now iterate the steps for my code...

To draw the image I call GetListBoxItems

void CMyView::GetListBoxItems(CDC &dc, CBitmap &bm)
{
 CDC memDC;
 memDC.CreateCompatibleDC(&dc);

 // Let's get the size of the approximate rectangle that will encompass all
items
 CSize listRect(m_ListBox.ApproximateViewRect());

 // Now get the maximum printing area of the printer
 CSize printerLP(dc.GetDeviceCaps(HORZRES), dc.GetDeviceCaps(VERTRES));

 // Now adjust the memDC
 memDC.SetMapMode(MM_ISOTROPIC);
 memDC.SetWindowExt(printerLP);
 memDC.SetViewportExt(listRec);

 // Create the bitmap now with the correct dimensions
 bm.CreateComaptibleBitmap(&dc, listRect.cx, listRect.cy);
 CBitmap *pOrigBM = memDC.SelectObject(&bm);

 // Now all I do is iterate through each of the items, using LVITEM...
 // For that new item, I memDC.TextOut the item's text

*****
Seems remarkably clumsy, and why use a bitmap? Why not just do
int x = ... compute left margin here;
int y = ... compute top margin
TEXTMETRIC tm;
dc.GetTextMetrics(&tm);
int LineHeight = tm.tmHeight + tm.tmInternalLeading;

for(int i = 0; i < c_ctl.GetCount(); i++)
    { /* print contents */
     CString s;
     c_ctl.GetLBText(i, s);
     dc.TextOut(x, y, s);
     y += LineHeight;
    } /* print contents */

}


I see no reason here to consider using some intermediate bitmap along the way. It will
only produce ugly results.

To fit it to the maximum size, you could get each line and compute
    CSize sz = dc.GetTextExtent(s);
    width = max(width, sz.cx);
then compute font such that the longest line fits across the page, e.g.,

    int page = dc.GetDevCaps(SZHORZ);
    double ratio = (double) page / (double)width;
    CFont * f = dc.GetCurrentFont();
    LOGFONT lf;
    f->GetLogFont(&lf);
    lf.lfHeight = (int) ((double)lf.lfHeight * ratio);
    CFont newfont;
    newfont.CreateFontIndirect(&lf);
    dc.SelectObject(&newfont);

(or something very close to this; I'm typing this largely from memory)

Do not use a bitmap for printing unless there is some overwhelmingly compelling reason for
doing so, and such reason does not exist in this case.

Note that if you want to fit all the contents on one page, you may have to compute the
ratio as the min of the ratio for full width and the ratio for full height.
                    joe

******

Now, let me comment on my code. I know I do not need to create a memory DC,
but I do it for now, for later I will be appending other bitmaps to the
printer DC, but for now I want my list box to encompass the entire page.

Again, the problem is scaling. I believe the issue is stemming from the
mapping mode and setting the extents of the viewport and the window. Again,
I thank you all for perusing my code and assisting me in my predicament.
Should you need more code, I will be more than happy to post it, but I did
not want to intimidate anyone with the amount of code.

Thank you,

Saul775

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm


Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

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