Difference in behaviour of some fonts in Windows 7 and Windows XP when orientation is 900 or 2700

[EDN Admin]

I have following code in my application (in OnPaint() of a dialog):
<pre class="prettyprint CPaintDC dc(this); // device context for painting

dc.SetGraphicsMode(GM_ADVANCED);
dc.SetMapMode( MM_ANISOTROPIC );
dc.SetWindowExt( 1000, 1000 );
dc.SetViewportExt( 96, 96 );

LOGFONT lf;

lf.lfHeight = 166;
lf.lfWidth = 0;
lf.lfEscapement = 0;
lf.lfOrientation = 900;
//lf.lfOrientation = 0;// Orientation 0 works OK, 900 and 2700 makes characters overlapping
lf.lfWeight = 400;
lf.lfItalic = 0;
lf.lfUnderline = 0;
lf.lfStrikeOut = 0;
lf.lfCharSet = 1;
lf.lfOutPrecision = 0;
lf.lfClipPrecision = 0;
lf.lfQuality = 2;
lf.lfPitchAndFamily = 0;
strcpy(lf.lfFaceName, "Arial" ) ;
//strcpy(lf.lfFaceName, "MS Sans Serif" ) ; // This Works OK

CFont *Object = new CFont;

//
// Create the font, using the LogFont...
//
VERIFY(Object->CreateFontIndirect(&lf) == TRUE);

CFont *OldFont = dc.SelectObject( Object );
UINT Flags = DT_LEFT |DT_NOPREFIX| DT_NOCLIP | DT_WORDBREAK;
CString strToDraw = "Test String";
CRect r(200,200,8000,1200);

dc.DrawText(strToDraw, -1, &r, Flags);
[/code]
The string is drawn correctly if the orientation is 0. But if the orientation is set to 900 (0r 2700), the characters start overlapping.<br/>
The problem is seen on Windows 7 only. It works OK with Windows XP. Some of the fonts (e.g. MS Sans Serif) work OK on both Win7 and Win XP.

Is there any specific reason for the difference? Is there any way we can get results similar to Win XP in Win 7 with orientation set to 900?

Any Help is highly appreciated.

Thanks,
Krushna

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