I am having the old "no gdk backend" problem with GTKAgg. I am running OS X
10.6 (Snow Leopard), and, uh, I'm kind of new to Unix :). I installed the
following through Macports:
python26 @2.6.6_3 (active)
py26-gtk @2.22.0_1 (active)
py26-matplotlib @1.0.1_3+tkinter (active)
py26-numpy @1.6.0_0+atlas+gcc44 (active)
and the following code:
>
> from numpy import *
> import gtk
> import gobject
> import matplotlib
> matplotlib.use('GTKAgg')
> import matplotlib.pyplot as plt
>
gives the following error on the pyplot import:
>
> pydev debugger: warning: psyco not available for speedups (the debugger will
> still work correctly, but a bit slower)
>
> pydev debugger: starting
>
> Xlib: extension "RANDR" missing on display "/tmp/launch-KDlxaE/org.x:0".
>
> Traceback (most recent call last):
>
> File
> "/Applications/eclipseJavaHelios/plugins/org.python.pydev.debug_2.0.0.20110404
> 03/pysrc/pydevd.py", line 1134, in <module>
>
> debugger.run(setup['file'], None, None)
>
> File
> "/Applications/eclipseJavaHelios/plugins/org.python.pydev.debug_2.0.0.20110404
> 03/pysrc/pydevd.py", line 918, in run
>
> pydev_imports.execfile(file, globals, locals) #execute the script
>
> File
> "/Users/jwjameson/Dropbox/mine/PyStuff/workspace/Continuous/Pothead/Animator_P
> H_MPL.py", line 20, in <module>
>
> import matplotlib.pyplot as plt
>
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/sit
> e-packages/matplotlib/pyplot.py", line 95, in <module>
>
> new_figure_manager, draw_if_interactive, show = pylab_setup()
>
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/sit
> e-packages/matplotlib/backends/__init__.py", line 25, in pylab_setup
>
> globals(),locals(),[backend_name])
>
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/sit
> e-packages/matplotlib/backends/backend_gtkagg.py", line 10, in <module>
>
> from matplotlib.backends.backend_gtk import gtk, FigureManagerGTK,
> FigureCanvasGTK,\
>
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/sit
> e-packages/matplotlib/backends/backend_gtk.py", line 28, in <module>
>
> from matplotlib.backends.backend_gdk import RendererGDK, FigureCanvasGDK
>
> File
> "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/sit
> e-packages/matplotlib/backends/backend_gdk.py", line 29, in <module>
>
> from matplotlib.backends._backend_gdk import pixbuf_get_pixels_array
>
> ImportError: No module named _backend_gdk
I noticed the page:
http://matplotlib.sourceforge.net/faq/installing_faq.html
<http://matplotlib.sourceforge.net/faq/installing_faq.html>
says nothing about Macports.
I noticed the page
http://old.nabble.com/_backend_gdk-not-found-td26514059.html
<http://old.nabble.com/_backend_gdk-not-found-td26514059.html>
where Mr. Hunter says:
> matplotlib is probably not finding pygtk at build time -- you need
> have pkg-config installed, and locate your pygtk-2.0.pc file and then
> add that path to your PKG_CONFIG_PATH. You can check the output of
> the build script at the beginning in the section
>
> OPTIONAL BACKEND DEPENDENCIES
> libpng: 1.2.27
> Tkinter: Tkinter: 50704, Tk: 8.4, Tcl: 8.4
> wxPython: 2.8.8.0
> * WxAgg extension not required for wxPython >= 2.8
> Gtk+: gtk+: 2.14.4, glib: 2.18.2, pygtk: 2.13.0,
> pygobject: 2.15.3
> Mac OS X native: no
> Qt: Qt: 3.3.8, PyQt: 3.17.4
> Qt4: Qt: 4.4.3, PyQt4: 4.4.4
> Cairo: 1.4.12
>
> You need to have an entry for Gtk or else the backend will not be built.
>
but I have no idea how to utilize this info with Macports. I was not able to
locate a pygtk-2.0.pc file. If there were such a file, would Macports look
at it to configure the matplotlib installation as I would like (to be able
to use the GTKAgg backend)?
Any suggestions are greatly appreciated!
best,
john
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