Qt-interest Archive, December 2007
how to load and display emf images?
Message 1 in thread
Hi all,
Is there a way to load and display emf pics? In QPixmap doc, it does not support emf format image.
I don't know how to do this thing.
Raymond
llzhu1984
2007-12-24
Message 2 in thread
On Monday 24 December 2007 07:06:03 pm llzhu1984 wrote:
> Hi all,
>
> Is there a way to load and display emf pics? In QPixmap doc, it does not
> support emf format image. I don't know how to do this thing.
I haven't found anything, but would also appreciate any pointers.
At this stage I'm aware of the various tools and documentation from the wvWare
project:
http://wvware.sourceforge.net/libwmf.html
http://wvware.sourceforge.net/caolan/index.html
http://wvware.sourceforge.net/caolan/ora-wmf.html
Also http://libemf.sourceforge.net, but that appears to only be an EMF writer
(i.e. it can't input EMF and generate an image)
To actually get to a QImage or QPixmap, I think you'd need to parse the EMF
file and convert the various GDI-type operations to operations on a QPainter.
It may or may not be very difficult - I haven't tried it yet.
If you (or anyone else) does get a start on this, I may be interested in
collaborating on it.
Brad
--
[ signature omitted ]
Message 3 in thread
Hi,
since EMF is rather a vector format it might make sense to import it into a
QGraphicsScene instead of a QBitmap or QImage.
The format description (windows help file) can be obtained here:
http://www.wotsit.org/getfile.asp?file=emf&sc=251871739
Moreover, OpenOffice can import EMF files, so example source code should
also be available.
Regards,
Bernd
On Tuesday 25 December 2007, Brad Hards wrote:
> On Monday 24 December 2007 07:06:03 pm llzhu1984 wrote:
> > Hi all,
> >
> > Is there a way to load and display emf pics? In QPixmap doc, it does
> > not support emf format image. I don't know how to do this thing.
>
> I haven't found anything, but would also appreciate any pointers.
> At this stage I'm aware of the various tools and documentation from the
> wvWare project:
> http://wvware.sourceforge.net/libwmf.html
> http://wvware.sourceforge.net/caolan/index.html
> http://wvware.sourceforge.net/caolan/ora-wmf.html
>
> Also http://libemf.sourceforge.net, but that appears to only be an EMF
> writer (i.e. it can't input EMF and generate an image)
>
> To actually get to a QImage or QPixmap, I think you'd need to parse the
> EMF file and convert the various GDI-type operations to operations on a
> QPainter. It may or may not be very difficult - I haven't tried it yet.
>
> If you (or anyone else) does get a start on this, I may be interested in
> collaborating on it.
>
> Brad
--
[ signature omitted ]
Message 4 in thread
On Tuesday 25 December 2007 09:29:44 pm Bernd Brandstetter wrote:
> since EMF is rather a vector format it might make sense to import it into a
> QGraphicsScene instead of a QBitmap or QImage.
I'm interested in what the advantage of this might be over (say) just using a
QPainter directly on a QImage?
> The format description (windows help file) can be obtained here:
> http://www.wotsit.org/getfile.asp?file=emf&sc=251871739
>
> Moreover, OpenOffice can import EMF files, so example source code should
> also be available.
My previous testing showed that OpenOffice could open some ".emf" files, but
not all. It looks like there may be "EMF+" extensions. See:
http://www.protocolfreedom.org/PFIF_agreement.pdf
Brad
--
[ signature omitted ]
Message 5 in thread
Hi,
On Tuesday 25 December 2007, Brad Hards wrote:
> On Tuesday 25 December 2007 09:29:44 pm Bernd Brandstetter wrote:
> > since EMF is rather a vector format it might make sense to import it
> > into a QGraphicsScene instead of a QBitmap or QImage.
>
> I'm interested in what the advantage of this might be over (say) just
> using a QPainter directly on a QImage?
the advantage is simply that the view could be zoomed in and out without
losing details or getting pixelated. If this is not required then using a
QImage is of course sufficient.
Regards,
Bernd
--
[ signature omitted ]
