py26-matplotlib with Qt4

[celil.rufat@…]

I just installed py26-matplotlib with the Qt4 backend using the following command

sudo port install py26-matplotlib +qt4

However, this doesn't work. Running one of the examples provided:

$ python /opt/local/share/py26-matplotlib/examples/user_interfaces

returns the following error:

/embedding_in_qt4.py
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_qt4.py", line 168, in resizeEvent
    self.draw()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_qt4agg.py", line 130, in draw
    FigureCanvasAgg.draw(self)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 314, in draw
    self.figure.draw(self.renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 773, in draw
    for a in self.axes: a.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1735, in draw
    a.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 742, in draw
    tick.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 196, in draw
    self.label1.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 515, in draw
    bbox, info = self._get_layout(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 272, in _get_layout
    'lp', self._fontproperties, ismath=False)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 158, in get_text_width_height_descent
    font = self._get_agg_font(prop)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 195, in _get_agg_font
    fname = findfont(prop)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 1308, in findfont
    _rebuild()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 1292, in _rebuild
    fontManager = FontManager()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 984, in __init__
    self.ttffiles = findSystemFonts(paths) + findSystemFonts()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 341, in findSystemFonts
    for f in get_fontconfig_fonts(fontext):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 303, in get_fontconfig_fonts
    status, output = commands.getstatusoutput("fc-list file")
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/commands.py", line 56, in getstatusoutput
    text = pipe.read()
IOError: [Errno 4] Interrupted system call

[celil.rufat@…]

Sorry, there is a typo above. The command for running the test should be:

python /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py

[skymoo (Adam Mercer)]

Take note of the message that is displayed after installing:

The default backend is now the non-interactive Agg backend, different
backends can be specified using the ~/.matplotlib/matplotlibrc file.
More details, regarding backends, can be found in the matplotlib FAQ:

http://matplotlib.sourceforge.net/faq/installing_faq.html#what-is-a-backend

You're not specifying which backend you want so its defaulting to Agg, if you run the example script specifying the QT4Agg backend it will work as expected:

python /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py -DQT4Agg

[celil.rufat@…]

Running the script with -DQT4Agg still produces to the same error on my computer.

[skymoo (Adam Mercer)]

It works for me:

[ram@cizin ~]$ port installed py26-matplotlib
The following ports are currently installed:
  py26-matplotlib @0.99.1.1_0+qt4 (active)
[ram@cizin ~]$ python /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py -DQT4Agg

Then the Qt window is displayed the plots as expected.

The above traceback implies you are using the Agg backend.

[celil.rufat@…]

That traceback was of the original command. Here is the traceback when I add the "-DQT4Agg" flag:

altair:~ drufat$ port installed py26-matplotlib
The following ports are currently installed:
  py26-matplotlib @0.99.1.1_0+qt4 (active)
altair:~ drufat$ python /opt/local/share/py26-matplotlib/examples/user_interfaces/embedding_in_qt4.py -DQT4Agg
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_qt4.py", line 168, in resizeEvent
    self.draw()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_qt4agg.py", line 130, in draw
    FigureCanvasAgg.draw(self)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 314, in draw
    self.figure.draw(self.renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/figure.py", line 773, in draw
    for a in self.axes: a.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axes.py", line 1735, in draw
    a.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 742, in draw
    tick.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/axis.py", line 196, in draw
    self.label1.draw(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 515, in draw
    bbox, info = self._get_layout(renderer)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/text.py", line 272, in _get_layout
    'lp', self._fontproperties, ismath=False)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 158, in get_text_width_height_descent
    font = self._get_agg_font(prop)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/backends/backend_agg.py", line 195, in _get_agg_font
    fname = findfont(prop)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 1308, in findfont
    _rebuild()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 1292, in _rebuild
    fontManager = FontManager()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 984, in __init__
    self.ttffiles = findSystemFonts(paths) + findSystemFonts()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 341, in findSystemFonts
    for f in get_fontconfig_fonts(fontext):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/matplotlib/font_manager.py", line 303, in get_fontconfig_fonts
    status, output = commands.getstatusoutput("fc-list file")
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/commands.py", line 56, in getstatusoutput
    text = pipe.read()
IOError: [Errno 4] Interrupted system call

[skymoo (Adam Mercer)]

Do you have fontconfig installed?

[celil.rufat@…]

Yes, I do:

altair:~ drufat$ port installed fontconfig
The following ports are currently installed:
  fontconfig @2.7.3_0+macosx (active)

[celil.rufat@…]

It seems to me that with or without the -DQT4Agg flag there is no difference in the error output that I get. Do you get an error, when you run the script with the -DQT4Agg flag on your computer?

[skymoo (Adam Mercer)]

Looking more closely the trackbacks are the same, and yes the script runs without error for me whether or not I specify the -DQT4Agg option.

I can't understand whats going on as it all works for me. I've noticed you've email the matplotlib list, hopefully they'll be able to shed some light on the matter...

[celil.rufat@…]

Are you running on Snow Leopard 10.6?

altair:~ drufat$ uname -a
Darwin altair 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov  3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386

[skymoo (Adam Mercer)]

yep:

$ uname -a
Darwin cizin.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov  3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 i386

Are you using a 32 or 64bit system?

[celil.rufat@…]

I'm compiling everything in 64bit.

I've noticed that py26-matplotlib depends on py26-pyobjc2. However, it seems that there is a problem with that port on my system as seen below. I am not sure if this is related to the current issue, or if it is an unrelated bug. Can you check if your py26-pyobjc2 is working properly?

altair:~ drufat$ port deps py26-matplotlib
Full Name: py26-matplotlib @0.99.1.1+tkinter
Library Dependencies: python26, freetype, libpng, py26-dateutil, py26-tz,
                      py26-numpy, py26-configobj, py26-pyobjc2,
                      py26-pyobjc2-cocoa
altair:~ drufat$ python
Python 2.6.4 (r264:75706, Nov 11 2009, 01:57:04) 
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import Foundation
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/Foundation/__init__.py", line 10, in <module>
    from CoreFoundation import *
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/CoreFoundation/__init__.py", line 17, in <module>
    scan_classes=False)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/PyObjC/objc/_bridgesupport.py", line 129, in initFrameworkWrapper
    _parseBridgeSupport(data, globals, frameworkName, dylib_path)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/PyObjC/objc/_bridgesupport.py", line 53, in _parseBridgeSupport
    objc.parseBridgeSupport(data, globals, frameworkName, *args, **kwds)
ValueError: Unknown typestr
>>> exit()

[skymoo (Adam Mercer)]

Same here, I've opened #22489 for this.

[skymoo (Adam Mercer)]

Let me know if the patch suggested on the upstream list fixes the problem, if so I'll look at integrating it into the port.

[celil.rufat@…]

patch by Jouni K. Seppänen

[celil.rufat@…]

I can confirm the attached patch fixes the problem on my computer. Thanks for your help!

[skymoo (Adam Mercer)]

Add upstream patch in r60517