[Qt-interest] cosmetic drawText()

[Sean Harmer]

Hi Andre,

On Friday 29 May 2009 08:41:41 Andre Haupt wrote:
> Hi all,
>
> I use QPainter with an applied QMatrix to scale and translate the
> coordinates according to the data i want to draw.
>
> Drawing lines works as expected if the painters pen is set cosmetic.
> Otherwise the drawn lines will be stretched.
>
> However, if i draw text, setting the pen to cosmetic has no influence
> on the appearing of the text. The text is always drawn stretched.
>
> What am I missing?
I think that drawing lines with a cosmetic pen works because it gets treated 
as a infinitesimal width line. The trouble is with drawing text is that each 
glyph in a font has an actual extent and so is subject to the scaling 
transformation. So, I think that you need to "undo" the scaling part of the 
transform by applying the inverse of it to your painter object before calling 
drawText().

Cheers,

Sean