Re: [Matplotlib-users] Matplotlib V1.3 suptitle

[Peter B. <pet...@ca...>]

On 08/23/2013 11:31 AM, Benjamin Root wrote:
>
> On Fri, Aug 23, 2013 at 11:21 AM, Peter Bloomfield 
> <pet...@ca... <mailto:pet...@ca...>> wrote:
>
>
>     On 08/23/2013 10:43 AM, Benjamin Root wrote:
>>
>>
>>     On Fri, Aug 23, 2013 at 9:57 AM, Peter Bloomfield
>>     <pet...@ca...
>>     <mailto:pet...@ca...>> wrote:
>>
>>         Good morning,
>>
>>         I am running openSuSE 12.2, and this morning I upgraded
>>         matplotlib to v1.3, and now I am having a problem with suptitle.
>>         I use the following lines to put a title and legend onto a
>>         plot figure
>>
>>         import matplotlib.pyplot as plt
>>
>>             plt.figure(1)
>>
>>         plt.suptitle( "Study# : " + os.path.basename(
>>         inImage_IO.IO_FileName ) + \
>>
>>         "\n" + "{ Acquired : " + \
>>
>>         AcqDateTime.strftime( "%b %d, %Y - $T_o$ @ %H:%M:%S" ) + " }", \
>>
>>         y=0.98, weight="roman", size="large" )
>>
>>         plt.suptitle( "{Creation Date : " + AnalysisTOD + "}",
>>
>>         x=0.86, y=0.03, weight="roman", size="x-small" )
>>
>>
>>         Under v1.3, I only get the 'Creation Date : ...' text at the
>>         bottom of the figure the 'Study# ...' string is not present
>>         at the top. If I change
>>         it to
>>
>>         import matplotlib.pyplot as plt
>>
>>             plt.figure(1)
>>
>>         plt.suptitle( "Study# : ", y=0.98, weight="roman", size="large" )
>>
>>         plt.suptitle( "{Creation Date : " + AnalysisTOD + "}",
>>
>>         x=0.86, y=0.03, weight="roman", size="x-small" )
>>
>>         the 'Creation Date : ...' text at the bottom of the figure
>>         the 'Study# : ' string is at the top.
>>
>>
>>         So the problem is in the string construct in the first
>>         example. Does anybody know of a way to get around this?
>>
>>
>>         Thanks in advance
>>
>>
>>         Peter
>>
>>
>>     Oh, wow... we didn't think anybody was using that "misfeature". 
>>     This was a bug we fixed for 1.3, in that users complained that
>>     calling plt.title() would update an existing title, but
>>     plt.suptitle() would not (multiple calls would just result in
>>     text overlaid on top of each other).  We fixed this for 1.3 so
>>     that there is a single text object that is kept and is revised in
>>     subsequent calls to suptitle().  To get what you want, you will
>>     have to consolidate those strings into one.
>>
>>     Cheers!
>>     Ben
>>
>     Thanks for getting back to me, but I have tried to do as you
>     suggest, but to no avail, and here I apologise for my lack of
>     knowledge of python/matplotlib.
>     I consolidated the strings into one, titleStr
>
>         titleStr = "Study# : " + os.path.basename(
>     inImage_IO.IO_FileName ) + \
>
>                "\n" + "{ Acquired : " + \
>                     AcqDateTime.strftime( "%b %d, %Y - $T_o$ @
>     %H:%M:%S" ) + " }"
>         plt.suptitle( titleStr, y=0.98, weight="roman", size="large" )
>
>     which should write the string
>         'Study# : Pos9.img\n{ Acquired : Feb 18, 2003 - $T_o$ @
>     14:55:02 }'
>     at the top of the figure,  but it did not, so I thought it is the
>     "\n", and tried
>
>         titleStr = "Study# : " + os.path.basename(
>     inImage_IO.IO_FileName )
>         plt.suptitle( titleStr, y=0.98, weight="roman", size="large" )
>
>     which should write the string
>         'Study# : Pos9.img'
>     and this again failed to write the suptitle in the figure.
>
>     Am I being dumb (rhetorical)? What is the best way to consolidate
>     the strings to work with suptitle, many thanks in advance.
>
>     Cheers
>
>     Peter
>
>
> No issues here.  Let's try simplifying it further and further.  Try 
> the following script.
>
> import matplotlib.pyplot as plt
> plt.suptitle("Study# : Pos9.img")
> plt.show()
>
> Does that work for you? If it does, iterate on that code example, 
> adding pieces back into it and see when it breaks.
>
> Ben Root
The example works, and changing it to

import matplotlib.pyplot as plt

plt.suptitle( "Study# : Pos9.img\n{ Acquired : Feb 18, 2003 - $T_o$ @ 
14:55:02 }")

plt.show()

also works.


Though now,  I need to apologise, in my original email I should have 
added that I am using
from matplotlib.backends.backend_pdf import PdfPages

to write a pdf file of the save the figure.


I extended the example to a small script

     from matplotlib.backends.backend_pdf import PdfPages
     import matplotlib.pyplot as plt
     PDF_Filename = "Test.pdf"
     OutPDF = PdfPages( PDF_Filename )
     plt.suptitle("Study# : Pos9.img\n{ Acquired : Feb 18, 2003 - $T_o$ 
@ 14:55:02 }")
     plt.savefig( OutPDF, dpi=600, format="pdf" )
     OutPDF.close()

and this also works, the text is now written correctly in Test.pdf.

However, if I add a second call to plt.suptitle in the script the text 
added from the first call is removed, which is what was refered to in 
the first response.

Cheers

Peter