I added support to the pdf backend for multipage pdf files. The current
API (which I'm not entirely happy with) is that you create a PdfFile
object, plot your figures, saving each one to the PdfFile object, and
then close the object. The part I'm unhappy about is that because
PdfFile is a file-like object - it has a write method - you can
accidentally save your figure as a png into it and get a broken pdf
file. You have to specify format='pdf' to savefig to avoid this.
Here's an example:
from matplotlib.backends.backend_pdf import PdfFile
pdf = PdfFile('multipage_pdf.pdf')
figure(...)
# build your figure
savefig(pdf, format='pdf')
# repeat for all your figures
pdf.close()
···
--
Jouni K. Sepp�nen
http://www.iki.fi/jks
It's slightly hackish, but would it be possible to do an "isinstance" check in savefig, and if the first arg is a PdfFile, set "format" to "pdf" automatically, and if "format" is set to something else raise an exception? A little hackish because it doesn't necessarily scale to other formats easily, but it would prevent the user from shooting herself in the foot.
Mike
Jouni K. Sepp�nen wrote:
···
I added support to the pdf backend for multipage pdf files. The current
API (which I'm not entirely happy with) is that you create a PdfFile
object, plot your figures, saving each one to the PdfFile object, and
then close the object. The part I'm unhappy about is that because
PdfFile is a file-like object - it has a write method - you can
accidentally save your figure as a png into it and get a broken pdf
file. You have to specify format='pdf' to savefig to avoid this.
Here's an example:
from matplotlib.backends.backend_pdf import PdfFile
pdf = PdfFile('multipage_pdf.pdf')
figure(...)
# build your figure
savefig(pdf, format='pdf')
# repeat for all your figures
pdf.close()
Another (still slightly hacky) way might be to define an optional attribute of the file object. Something like this:
if hasattr( outputFile, "mplFormat" ):
format = getattr( outputFile, "mplFormat" )
Then have set PdfFile.mplFormat to be "pdf". This is a little less hacky in that it doesn't depend on coding a specific class into savefig.
Ted
···
-----Original Message-----
From: Michael Droettboom [mailto:mdroe@…31…]
Sent: Friday, January 02, 2009 7:27 AM
To: matplotlib-devel@lists.sourceforge.net
Subject: Re: [matplotlib-devel] Multipage pdf files
It's slightly hackish, but would it be possible to do an "isinstance"
check in savefig, and if the first arg is a PdfFile, set "format" to
"pdf" automatically, and if "format" is set to something else raise an
exception? A little hackish because it doesn't necessarily scale to
other formats easily, but it would prevent the user from shooting
herself in the foot.
Mike
Jouni K. Seppänen wrote:
> I added support to the pdf backend for multipage pdf files. The
current
> API (which I'm not entirely happy with) is that you create a PdfFile
> object, plot your figures, saving each one to the PdfFile object, and
> then close the object. The part I'm unhappy about is that because
> PdfFile is a file-like object - it has a write method - you can
> accidentally save your figure as a png into it and get a broken pdf
> file. You have to specify format='pdf' to savefig to avoid this.
>
> Here's an example:
>
> from matplotlib.backends.backend_pdf import PdfFile
>
> pdf = PdfFile('multipage_pdf.pdf')
>
> figure(...)
> # build your figure
> savefig(pdf, format='pdf')
>
> # repeat for all your figures
>
> pdf.close()
>
>
>
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