Re: Movement in TextOut. Why?

From:

=?Utf-8?B?VHJlY2l1cw==?= <Trecius@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 19 Feb 2007 11:22:26 -0800

Message-ID:

<4197A4A2-B903-45B4-A971-595629382E38@microsoft.com>

Yes, it works correctly in MM_TEXT, but it does not work accurately in
MM_ANISOTROPIC, and I'm wondering as to why.

Also, yes, it should be GetTextExtent(...); I'm sorry for the mistype. Good
catch. :)

"AliR (VC++ MVP)" wrote:

Shouldn't this part be more like this?

// Calculate the height extent of the string
CSize ext;
ext = dc.GetTextExtent(CString(_T("Hello"));

    CRect Rect;
    GetClientRect(&Rect)

    //put the text on the bottom right.
    ext.cx = Rect.right - ext.cx;
    ext.cy = Rect.bottom - ext.cy;
    //****************
    //if because you are drawing the text vertically GetTextExt puts the
height in cx
    //then maybe like this

    ext.cx = Rect.right - ext.cy;
    ext.cy = Rect.bottom - ext.cx;
    //************************

// Output the text at the bottom
dc.TextOut(ext.cx, ext.cy, CString(_T("Hello")));

At least this is how it would work in MM_TEXT.

Ali

"Trecius" <Trecius@discussions.microsoft.com> wrote in message
news:47DAE1C3-EAC8-462B-80C1-EBA553FA9EF4@microsoft.com...

Hello once again, Newsgroupians:

I've another question relating to drawing on a DC.

Joseph Newcomer has been very instrumental in assisting me; however, I am
stuck once again.
I am trying to write some text at the bottom of the client area. I do not
know the length of the string that I am going to write at the bottom, so I
am
using GetTextExtent to determine the length of it and position it
accordingly. However, when someone drags and moves the window, the text
is
moving VERTICALLY!

I have the following code in my OnPaint handler for a CFormView.

void CRalView::OnPaint()
{
CPaintDC dc(this);

CRect rect;
GetClientRect(&rect);

// Change the map to +x to the right and +y is up.
// Change the origin to the bottom-left of the client
dc.SetMapMode(MM_ANISOTROPIC);
dc.SetWindowExt(32767, 32767);
dc.SetViewportExt(rect.right, -rect.bottom);
dc.SetViewportOrg(0, rect.bottom);

// Create a font at a 90 degree angle to the horizontal axis
// Also, make the average width to be 1000 device points
CFont vertFont;
vertFont.CreateFont(1000, 0, 900, 900, ...);

// Select the new font
CFont *pOrigFont;
pOrigFont = dc.SelectObject(&vertFont);

// Calculate the height extent of the string
CSize ext;
ext = dc.GetTextExtent(CString(_T("Hello"));

// Output the text at the bottom
dc.TextOut(10000, ext.cx, CString(_T("Hello")));
dc.SelectObject(pOrigFont);
}

Now, why does the text move VERTICALLY when someone is resizing the window
HORIZONTALLY?

I know GetTextExtent() assumes the text to be horizontal, but the device
points for the created font is 1000. Therefore, shouldn't GetTextExtent()
always return the same number if the string being passed to it is always a
constant, for the extents of the window are not changing?

Thank you, Newgroupians, for your continued guidance and help.

Trecius