[PyQt] Exporting an image to a PDF

[Vincent Vande Vyvre]

Le 20/10/12 18:21, Ajay Garg a écrit :
>
>
> On Sat, Oct 20, 2012 at 8:43 PM, Vincent Vande Vyvre
> <vincent.vandevyvre at swing.be <mailto:vincent.vandevyvre at swing.be>> wrote:
>
>     Le 20/10/12 15:59, Ajay Garg a écrit :
>     > Hi all.
>     >
>     > I have been looking for ways to get things exported to PDF; I
>     must say
>     > that I am pleasantly surprised by the ease of exporting a
>     > text-document to a PDF :)
>     >
>     > Googling also says that exporting an image to pdf is "easier" than
>     > exporting a text-documnt in PyQt; unfortunately for me, I have not
>     > been able to find the steps to do that :-\
>     > So, I will be grateful if I could be directed to a "Hello World"
>     > program to do this.
>     >
>     >
>     > My requirement is very simple ::
>     >
>     >                 * Read an image file (png/jpeg, etc).
>     >                 * Export to PDF; simple. No editing of pixels,
>     or any
>     > other stuff.
>     >
>     >
>     >
>     > Looking forward to some pointers :)
>     >
>     >
>     >
>     > Regards,
>     > Ajay
>     >
>     >
>     >
>     > _______________________________________________
>     > PyQt mailing list    PyQt at riverbankcomputing.com
>     <mailto:PyQt at riverbankcomputing.com>
>     > http://www.riverbankcomputing.com/mailman/listinfo/pyqt
>     Minimalistic example:
>
>     #----------------------------------------------------------------------
>     image = QtGui.QImage("myImage.jpg")
>     printer = QtGui.QPrinter()
>     printer.setResolution(300)
>     printer.setOutputFormat(QtGui.QPrinter.PdfFormat)
>     printer.setOutputFileName("myImage.pdf")
>
>     painter = QtGui.QPainter()
>     painter.begin(printer)
>     painter.drawImage(target, image, source)
>     painter.end()
>
>     #------------------------------------------------------------------------
>
>     where target & source are QtCore.QRectF(sheet) & QtCore.QRectF(image)
>
>     A more complete example here:
>
>     http://bazaar.launchpad.net/~vincent-vandevyvre/oqapy/serie-1.0/view/head:/oqapy-1.0/printing.py
>     <http://bazaar.launchpad.net/%7Evincent-vandevyvre/oqapy/serie-1.0/view/head:/oqapy-1.0/printing.py>
>
>
>
> Thanks a ton Vincent !!
> I could get myself started with image-exporting to pdf (all courtesy
> you :) )
>
>
> One thing I must tell you; right now, I just got myself bootstrapped,
> without truly putting the correct values in "target" and "source".
> I have two queries though ::
>
> a)
> "target" represents the target-canvas, of which the image will take
> the size, right?
>
>
>
> b)
> If yes, then I find it a  little odd, that no such target is
> specified, while exporting a text-document to pdf.
> For example, here is my code to export a text-document to pdf ::
>
> ####################################################################################
> from PyQt4.QtGui import *
> import sys
>
> app = QApplication(sys.argv)
>
> text_file_path = open('sample.py').read()
> doc = QTextDocument(text_file_path)
>
> printer = QPrinter(QPrinter.HighResolution)
> printer.setOutputFormat(QPrinter.PdfFormat)
> printer.setOutputFileName('sample.pdf')
>
> doc.print_(printer)
> ####################################################################################
>
>
> Here, we can see that no "target" QtCore.QRectf is passed to the
> printing options.
>
> Any idea of this descrepancy? (as to why the "target" canvas is
> specified while exporting an  image; but not when exporting a
> text-document, though the "target" canvas size is usually fixed,
> irrespective of the source mime-type).

Because in my example I've used QPainter.drawImage() and not
QTextDocument.print_().

See the doc:

http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qpainter.html#drawImage

you can also use only the origin of the image instead of target-source,
but you'll need to handle the margin parameters of your printer.
>
>
> Thanks anyways for your already rendered massive help :)
>
>
>
> Regards,
> Ajay
>


-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>