matplotlib-devel Mailing List for matplotlib

Hi All,

I am new to this list, but a real fan of matplotlib, so I thought I would
post this here.  I am not sure if a bug report is more appropriate - please
let me know!

I have recently come across some font loading errors when using matplotlib
0.87.7-2 (and previous versions).  I have tracked these errors down to
font_manager.py in the matplotlib distribution, which is why I am emailing
you guys (I saw your email addresses in the file).

My installation details are as follows:  I am using python 2.5 with
matplotlib 0.87.7-2 on OSX 10.4 both installed with fink (
http://fink.sourceforge.net).  I also encountered the same errors I will
describe with python 2.3 and an earlier version of matplotlib.  I have 2
font path environment variables set TTFPATH=/sw/lib/X11/fonts/applettf, and
AFMPATH=/sw/share/texmf-dist/fonts/afm (/sw is where fink installs all
files).

The crux of the matter is that my TTFPATH directory contains a bunch of .ttf
files, while my AFMPATH directory contains subdirectories that themselves
contain .afm files.  The existing version of font_manager.py does not step
through these subdirectories, and thus none of my afm fonts were being
included in the search for fonts.  Furthermore, there was a problem in
parsing binary .ttf files when I was trying to load only ascii-encoded afm
files.

I tracked this down to the findSystemFonts(fontpaths,fontext) method in
font_manager.py and modified it in 2 places to step through subdirectories
(with os.walk), and to make sure it only loads the correct font with
extension fontext.  Below I give a diff of my modifications (each commented
with a #JBL), and the existing file:

diff font_manager.py font_manager_broken.py
42,43d41
< #JBL import re to match to file extension
< import re
209,212c207,208
<                     #JBL ONLY load if the proper fontext extension
<                     if re.match(fontext,f):
<                         fontfiles[f] = 1
<
---
>                     fontfiles[f] = 1
>
216,225c212,217
<     #JBL
<     #Supposed to be searching recursively here
<     # for path in fontpaths:
<     # use os.walk to walk through any directories listed
<     for root_path in fontpaths:
<         for path, dirs, file_names in os.walk(root_path):
<             files = glob.glob(os.path.join(path, '*.'+fontext))
<             files.extend(glob.glob(os.path.join(path,
'*.'+fontext.upper())))
<             for fname in files:
<                 fontfiles[os.path.abspath(fname)] = 1
---
>     for path in fontpaths:
>         files = glob.glob(os.path.join(path, '*.'+fontext))
>         files.extend(glob.glob(os.path.join(path, '*.'+fontext.upper())))
>         for fname in files:
>             fontfiles[os.path.abspath(fname)] = 1
>

These changes fix all the font loading problems I noticed.  I think this is
an important fix for those users that have installed fonts in non-standard
ways and who use the environment variables to point to them.  Do you
recommend me contributing this fix to the matplotlib project?  Should I make
a patch, or contribute via svn?

I hope this is helpful, and appreciate any feedback anyone can give.

Sincerely,

Julius B. Lucks

-----------------------------------------------------
http://openwetware.org/wiki/User:Lucks
-----------------------------------------------------

On Tue, 16 Jan 2007 09:38:54 +0800
  Steve Chaplin <ste...@ya...> wrote:
> On Mon, 2007-01-15 at 10:57 -0800,
> mat...@li... wrote:
>>         Hi,
>>        =20
>>         I cannot install the latest matplotlib on=20
>>openSUSE10.2
>>         python setup.py install yields
>>        =20
> OK, I've updated _image.cpp to work on 64-bit systems=20
>with new versions
> of Python, but you will need to test it for me.
>=20
> Steve
>=20

Hi Steve,

This is to let you know that I was able to install
matplotlib via latest svn version. Thank you !

Cheers,
            Nils

Hello:
I am getting an identical error to the error encountered by Charlie Moad
(posted Apr 10, 2006; 08:46am).  I am running Python 2.4.4 (#71, Oct 18
2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32 with Matplotlib v
0.87.7.  my system is:

XP home, SP2 on a Dell XPS600, Dual Core P4 3.40GHz, 1 GB RAM

the error thread is exactly the same:

Traceback (most recent call last):
  File "C:\Python24\test.py", line 33, in -toplevel-
    pylab.savefig(filename)#,dpi=100)
  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 813, in
savefig
    return fig.savefig(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 682, in
savefig
    self.canvas.print_figure(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 456, in print_figure
    self.draw()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 392, in draw
    self.figure.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 544, in
draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1063, in draw
    a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 561, in draw
    tick.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 161, in draw
    if self.label1On: self.label1.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 838, in draw
    Text.draw(self, renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 340, in draw
    bbox, info = self._get_layout(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 187, in
_get_layout
    w,h = renderer.get_text_width_height(
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 239, in get_text_width_height
    texmanager = self.get_texmanager()
  File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line
413, in get_texmanager
    from matplotlib.texmanager import TexManager
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 61,
in -toplevel-
    class TexManager:
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 83,
in TexManager
    dvipngVersion = get_dvipng_version()
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 58,
in get_dvipng_version
    raise RuntimeError('Could not obtain dvipng version')
RuntimeError: Could not obtain dvipng version

I saw in the message thread that a fix was committed, is this universal?

many thanks,
bernard

On Mon, 2007-01-15 at 08:26 -0700, Fernando Perez wrote:
> Those lines also work fine from an ipython prompt:
> 
> In [1]: from matplotlib.backends import backend_cairo
> 
> In [2]: from matplotlib.backends.backend_gtk import *

They work, but they are not relevant to this problem. Darren has
confused the issue by applying a fix to backend_gtkcairo.py (with no
CHANGELOG comment) while you and I are investigating the problem. So we
are executing the workaround command and are unable to reproduce the
bug.

However, if I put the line
import matplotlib.backends.backend_cairo as be_cairo
back into backend_gtkcairo.py I can now see the problem.

$ python
Python 2.4.3 (#1, Oct  1 2006, 18:00:19) 
[GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib.backends.backend_gtkcairo


$ ipython 
Python 2.4.3 (#1, Oct  1 2006, 18:00:19) 
Type "copyright", "credits" or "license" for more information.

IPython 0.7.2 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

In [1]: import matplotlib.backends.backend_gtkcairo.py
---------------------------------------------------------------------------
exceptions.AttributeError                            Traceback (most
recent call last)

/home/iuser/<ipython console> 

/usr/lib/python2.4/site-packages/matplotlib/backends/__init__.py 
     52 
     53 # a hack to keep old versions of ipython working with mpl
     54 if 'IPython.Shell' in  sys.modules:
---> 55     new_figure_manager, draw_if_interactive, show =
pylab_setup()
     56 

/usr/lib/python2.4/site-packages/matplotlib/backends/__init__.py in
pylab_setup()
     22     backend_name = 'backend_'+backend.lower()
     23     backend_mod =
__import__('matplotlib.backends.'+backend_name,
---> 24                              globals(),locals(),[backend_name])
     25 
     26     # Things we pull in from all backends

/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtkcairo.py 
      8 
      9 #from matplotlib.backends import backend_cairo
---> 10 import matplotlib.backends.backend_cairo as be_cairo
     11 from matplotlib.backends.backend_gtk import *
     12 

AttributeError: 'module' object has no attribute 'backends'







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