matplotlib-users Mailing List for matplotlib (Page 1460)

>>>>> "Flavio" == Flavio C Coelho <fcc...@fi...> writes:

    Flavio> Thanks a lot John, to my surprise, the example above
    Flavio> worked perfectly, but if I try that same thing with the
    Flavio> gtk backend it crashes at the very moment I issue the
    Flavio> command "from matplotlib.matlab import *" It must really
    Flavio> be a problem with gtk, I use pygtk 2.0 on a mandrake 9.1
    Flavio> linux system. Other apps that use pygtk run without
    Flavio> problems...

What version of pygtk are you running?  matplotlib requires 1.99.16.
don't know about Mandrake, but Redhat 9 comes with 1.99.14, so it is
possible you don't have a recent enough version of pygtk.  If you
would be willing to install pygtk-2.0.0 (it's just a 'python setup.py
install') and let me know if you can run the simple_plot.py example
from the command line, and then let me know if the crash goes away in
pycrust and Boaconstructor.

  ftp://ftp.gtk.org/pub/gtk/python/v2.0/pygtk-2.0.0.tar.gz

    Flavio> Why do you have to import matplotlib and matplotlib.matlab
    Flavio> separately?  the first import is not a problem on my
    Flavio> system. only the second crashes gtk-based tools (it
    Flavio> crashes Boa-constructor too)

This is the way to select among various backends (PS, GD, GTK, WX)
that the matlab module uses.  It can only use one, so you have to
select it before you import the matplotlib.matlab module.

JDH

LUK ShunTim wrote:

> John Hunter wrote:
> 
>>  > I can confirm that if the font files are installed in the default
>>  > location under the system python tree, it works. Setting AFMPATH also
>>  > works in linux.
>>
>> OK, so the font files exist and are readable.  In order to figure out
>> where the problem is, I'll need you to add a couple of lines to
>> matplotlib/backends/backend_ps.py and tell me what the output is.  In
>> the function _get_afm_filenames on line 413, add these print lines
>> before the return statement and let me know what they report
>>
>>     print paths
>>     print fnames
>>     return fnames
>>
>> John Hunter
> 
> 
> H:\00work\00cvs\matplotlib\matplotlib\examples>python subplot_demo.py -dPS
> ['E:\\Py23\\share\\matplotlib', 'E', '\\Py23e\\share\\matplotlib']
> []
> Error: Could not find any AFM files; please set AFMPATH to point to some 
> readable adobe font metric files
> 
> Regards,
> ST
> -- 

It appears that the following replacement of _get_afm_filenames
works. I'm a python learner so that may lead to other bugs. :-)

<quote>
     def _get_afm_filenames(self):
         paths = [os.path.join(distutils.sysconfig.PREFIX, 'share', 
'matplotlib')]
         if os.environ.has_key('AFMPATH'):
             afmpath = os.environ['AFMPATH']
             ### if afmpath.find(';')>0: #win32 style
             ###    paths.extend(afmpath.split(';'))
             ### elif afmpath.find(':')>0: # unix style
             ###    paths.extend(afmpath.split(':'))
             ### else:
         paths.append(afmpath)
	fnames = []
         fnames = [fname for fname in get_recursive_filelist(paths)
                   if fname.lower().find('.afm')>0 and
                      os.path.exists(fname)]
	### start debug
	#print paths
    	#print fnames
	###raw_input("Hit enter to continue -->")
	### end debug
         return fnames
</quote>

I'm going to sleep now. :-)

Good day,
ST
--

John Hunter wrote:

>  > I can confirm that if the font files are installed in the default
>  > location under the system python tree, it works. Setting AFMPATH also
>  > works in linux.
> 
> OK, so the font files exist and are readable.  In order to figure out
> where the problem is, I'll need you to add a couple of lines to
> matplotlib/backends/backend_ps.py and tell me what the output is.  In
> the function _get_afm_filenames on line 413, add these print lines
> before the return statement and let me know what they report
> 
>     print paths
>     print fnames
>     return fnames
> 
> John Hunter

H:\00work\00cvs\matplotlib\matplotlib\examples>python subplot_demo.py -dPS
['E:\\Py23\\share\\matplotlib', 'E', '\\Py23e\\share\\matplotlib']
[]
Error: Could not find any AFM files; please set AFMPATH to point to some 
readable adobe font metric files

Regards,
ST
--

 > I can confirm that if the font files are installed in the default
 > location under the system python tree, it works. Setting AFMPATH also
 > works in linux.

OK, so the font files exist and are readable.  In order to figure out
where the problem is, I'll need you to add a couple of lines to
matplotlib/backends/backend_ps.py and tell me what the output is.  In
the function _get_afm_filenames on line 413, add these print lines
before the return statement and let me know what they report

    print paths
    print fnames
    return fnames

John Hunter

John Hunter wrote:
 >
>     LUK> Another question: I've set the environmental variable AFMPATH
>     LUK> in the registry via the control panel but matplotlib
>     LUK> complains that the .afm files are not there.
> 
> I cannot replicate this problem on my system.  Are the *.afm files in
> E:\Py23e\share\matplotlib?  Are you sure you are running the right
> version of python, ie, do you still get the error with
> 
>   > E:\Py23e\python simple_plot.ps -dPS
> 

[snipped]

> 
> And let me know what it reports.  If you are using the fonts that ship
> with matplotlib, you shouldn't even need to set the AFMPATH because it
> automatically looks in the share/matplotlib subdir of your python
> install dir.  

I can confirm that if the font files are installed in the default 
location under the system python tree, it works. Setting AFMPATH also 
works in linux.

> 
> You may also want to verify that matplotlib is finding your
> environment variable by doing
> 
> 
>>python
>>
>>>>import os
>>>>print os.environ.has_key('AFMPATH')
> 

 >>> import os
 >>> os.environ["AFMPATH"]
'E:\\Py23e\\share\\matplotlib'

> 
> If the *.afm fonts are in the share/matplotlib dir, and you are using
> the right python, and the paths look correct from the diagnostic
> information above, the only thing I can think of is that these files
> are not readable by you (admin versus user thing?). To test this try
> 
> 
>>python
>>
>>>>fh = file('E:\Py23e\\share\\matplotlib\\phvl8a.afm', 'r')
>>>>s = fh.read()
>>>>len(s)
> 

 >>> fh = file('E:\Py23e\\share\\matplotlib\\afm\\phvl8a.afm', 'r')
 >>> len(fh.read())
15627

> 
> Let me know....
> JDH
> 

Regards,
ST
--

>>>>> "Flavio" == Flavio C Coelho <fcc...@fi...> writes:

    Flavio> Hi John et al., I know that the development of a wx
    Flavio> backend is under way.

Well under way in fact.  Jeremy O'Donoghue sent me a version yesterday
which I checked into CVS.  It is still under active development, with
several known bugs, but he has tested it across platforms with most of
the example scripts.  I'll post in the text of his email below which
has more details.

    Flavio> But meanwhile, can any of the non GTK backends (PS and GD)
    Flavio> be used from within a wx app?

    Flavio> I suspect that the answer to this question is no because
    Flavio> the mere import of matplotlib.matlab from any wxpython
    Flavio> shell (like pycrust) will crash it.  But I don't want to
    Flavio> assume that before I am certain of it.

matplotlib should not crash pycrust (it doesn't on my system).  This
may be related to an improper GTK install on your system.  In any
case, you need to import the backend you plan to use before importing
matplotlib.matlab.  I just did the following from pycrust w/o problems

import matplotlib
matplotlib.use('PS')
import os

def psshow():
    savefig('tmp.ps')
    os.system('ggv tmp.ps')
    close()

from matplotlib.matlab import *

plot([1,2,3])
psshow()

t = arange(0.0, 1.0, 0.01)
plot(t, sin(2*pi*t))
psshow()

I also did the the same with GD module.  Just replace 'PS' with GD and
execute your favorite image viewer command.

For either of these, though, You'll first need to comment out line 43
in _matlab_helpers.py, which reads 'figwin.window.destroy()'.  I only
discovered this bug when trying to answer your question.

Now, on to WX.  It is currently only working from pycrust and is under
heavy development, but you are welcome to try it from CVS.  Let me
know if you need a win32 installer and I'll email one.

Here is Jeremy's email:

I thought I'd keep you up to date with my progress.

Attached is the set of files for an early version of the wxWindows
back-end. It seems to work with most of the examples on the website, and
has been tested with wxPython 2.3.3 (on wxWindows 2.2.9) on Windows 2000
using Active State Python 2.2, and (less thoroughly) using wxWindows 2.4
under WxGTK with Python 2.3 on Debian GNU/Linux.

The implementation is very similar to your GTK back-end (probably too
similar, but I like re-using code which works :) This at least means that
it should be pretty easy for you to follow what I've done.

The code is probably only ready for very early users - if anyone is
screaming for wxWindows, you may wish to put it into CVS, otherwise it may
be better to wait for a while - say until I have the interactive functions
working. I'll leave it to your judgement.

Best regards

Jeremy

Known bugs:
- Coloured text labels to not work correctly. I do
  not yet understand why not, and will need to look
  carefully at how wxWindows treats text, as I think
  the code I have is OK!
- I currently do not perform any clipping, as this
  clips text labels.
- Under Windows 2000, the Figure window is larger
  than the figure (seems OK on Linux, however)
- Interactive sessions currently only work inside
  a Python console which already has a wxWindows
  event loop (I recommend PyCrust, which is
  distributed with wxPython)

Not implemented:
- Printing
- Interactive operation using the toolbar (probably
  not a large job to do, as I suspect that I can simply
  re-use the functions from backend_gtk).

Ugly hacks:
- Dotted lines - I have a nasty hack to make this work
  sufficiently for demonstration purposes. The problem
  is that you currently implement dotted lines in a rather
  GTK-specific way. I'd prefer, given that there are only
  a few 'dotted' styles, for these to have symbolic names
  (e.g. in a dictionary), and to do all of the decisions
  on how to draw the 'dotted' style in the back-end.
- As wxWindows has no 'stock' icons, I have converted GTK
  icons similar to those used in backend_gtk into XPM
  format and put them into an 'images' directory under
  backends. I'm open to your preference as to whether it
  would be better to put the images into python code or
  leave them as pixmaps.

Hi John et al.,

I know that the development of a wx backend is under way.

But meanwhile, can any of the non GTK backends (PS and GD) be used from
within a wx app?

I suspect that the answer to this question is no because the mere import
of matplotlib.matlab from any wxpython shell (like pycrust) will crash
it.  But I don't want to assume that before I am certain of it.

do the PS & GD backend support the show()  command? i.e., can they be
easily displayed on the screen or are they geared towards saving and
printing?

thanks

Fl=E1vio Coelho

>>>>> "LUK" == LUK ShunTim <shu...@po...> writes:


    LUK> I followed the link in the matplotlib site and installed gtk
    LUK> 2.2.4.1 from the sf site and the problem goes away. This
    LUK> version has all the images libraries with them. I must
    LUK> bookmark it!

Good news ...

    LUK> Another question: I've set the environmental variable AFMPATH
    LUK> in the registry via the control panel but matplotlib
    LUK> complains that the .afm files are not there.

I cannot replicate this problem on my system.  Are the *.afm files in
E:\Py23e\share\matplotlib?  Are you sure you are running the right
version of python, ie, do you still get the error with

  > E:\Py23e\python simple_plot.ps -dPS

You might want to add a diagnostic debug line to
backends/backend_ps.py to print the paths that it is searching.  After
line 422 in that file, insert a new line that prints the paths, eg,


    def _get_afm_filenames(self):
        paths = [os.path.join(distutils.sysconfig.PREFIX, 'share', 'matplotlib')]
        if os.environ.has_key('AFMPATH'):
            afmpath = os.environ['AFMPATH']
            if afmpath.find(';')>0: #win32 style
                paths.extend(afmpath.split(';'))
            elif afmpath.find(':')>0: # unix style
                paths.extend(afmpath.split(':'))
            else:
                paths.append(afmpath)
***     print paths
        fnames = []

And let me know what it reports.  If you are using the fonts that ship
with matplotlib, you shouldn't even need to set the AFMPATH because it
automatically looks in the share/matplotlib subdir of your python
install dir.  

You may also want to verify that matplotlib is finding your
environment variable by doing

> python
>>> import os
>>> print os.environ.has_key('AFMPATH')

If the *.afm fonts are in the share/matplotlib dir, and you are using
the right python, and the paths look correct from the diagnostic
information above, the only thing I can think of is that these files
are not readable by you (admin versus user thing?). To test this try

> python
>>> fh = file('E:\Py23e\\share\\matplotlib\\phvl8a.afm', 'r')
>>> s = fh.read()
>>> len(s)

Let me know....
JDH

John Hunter wrote:

>>>>>>"LUK" == LUK ShunTim <shu...@po...> writes:
> 
> 
>     LUK> Hello, When I tried out "python simple_plot.py" and tried to
>     LUK> save it as a png file, python crashes. No problem with saving
>     LUK> it to jpeg, though.
> 
> I haven't seen that before.  It works fine on my system (Windows ME)
> and noone else has reported a win32 problem.  The fact that it works
> with jpeg and not png suggests a lib PNG problem.  What version of
> pygtk and GTK-Runtime are you using.  If you are using pygtk-2.0.0 and
> GTK-Runtime-2.2.4.1, then you should be OK.  Have you installed an
> earlier version of these libs, possibly creating a library conflict?
> 
> When you search for libpng, what turns up?
>
> JDH
> 

GTK 2.2.4 (Can't remember where I got it. There's been a few of these 
floating around.) Pygtk 2.0.0 from the link in matplotlib site.

Somehow my GTK runtime don't have the png, jpeg etc images libraries and 
I got them from the gnuwin32 sf site.

I followed the link in the matplotlib site and installed gtk 2.2.4.1 
from the sf site and the problem goes away. This version has all the 
images libraries with them. I must bookmark it!

Another question: I've set the environmental variable AFMPATH in the 
registry via the control panel but matplotlib complains that the .afm 
files are not there.

<quote>
H:\00work\00cvs\matplotlib\matplotlib\examples>python simple_plot.py -dPS
Error: Could not find any AFM files; please set AFMPATH to point to some 
readable adobe font metric files

H:\00work\00cvs\matplotlib\matplotlib\examples>echo %AFMPATH%
E:\Py23e\share\matplotlib
</quote>

This is a W2K system.

Thanks very much,
ST
--

>>>>> "LUK" == LUK ShunTim <shu...@po...> writes:

    LUK> Hello, When I tried out "python simple_plot.py" and tried to
    LUK> save it as a png file, python crashes. No problem with saving
    LUK> it to jpeg, though.

I haven't seen that before.  It works fine on my system (Windows ME)
and noone else has reported a win32 problem.  The fact that it works
with jpeg and not png suggests a lib PNG problem.  What version of
pygtk and GTK-Runtime are you using.  If you are using pygtk-2.0.0 and
GTK-Runtime-2.2.4.1, then you should be OK.  Have you installed an
earlier version of these libs, possibly creating a library conflict?

When you search for libpng, what turns up?

JDH

Hello,

When I tried out "python simple_plot.py" and tried to save it as a png 
file, python crashes. No problem with saving it to jpeg, though.

My system: W2K SP4/Python2.3.2/matplotlib-0.31

Here's some traceback:

<quote>
python.exe caused an Access Violation at location 77f92373 in module 
ntdll.dll Writing to location 00000010.

Registers:
eax=00000000 ebx=00000000 ecx=00000000 edx=00000000 esi=7803a710 
edi=00000000
eip=77f92373 esp=0012e83c ebp=0012e89c iopl=0         nv up ei pl nz na 
pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=0038  gs=0000 
efl=00000202

Call stack:
77F92373  ntdll.dll:77F92373  RtlpWaitForCriticalSection
77F922F8  ntdll.dll:77F922F8  RtlImageDirectoryEntryToData
03B5C06C  libpng.dll:03B5C06C  png_set_read_fn
01F5F480
00FA5192  libgdk_pixbuf-2.0-0.dll:00FA5192  gdk_pixbuf_new_from_xpm_data
00FA53FF  libgdk_pixbuf-2.0-0.dll:00FA53FF  gdk_pixbuf_savev
00E822DA  _gtk.pyd:00E822DA  init_gtk
1E0591AA  python23.dll:1E0591AA  PyCFunction_Call
</quote>

Regards,
ST
--

A slightly different approach to live plotting.  I have a numerical
program that calls a status function every run through the main loop. It
allows the user to define a status function and pass it that function
(defaulting to just a one-line report on sys.err).

Using GTK idle slowed things down way too much, because GTK was always
idle, even though the number cruncher wasn't. GTK timeout didn't work
either. Using threads was too complicated and error prone, for no gain.
What I wanted was a meter that updated every second or so.

Here is my status function. It shows traces for the best score so far, and
the current score. If enough time has elapsed, it plots (thus scheduling
GTK events), otherwise no. So the gtk.events_pending() call near the end
is usually false.

It rescales the graph too, as required. You can ignore the "interrupted"
stuff -- that allows me to send a "stop" signal to the numerical routine,
saying "Ok, it looks to me like you've converged, stop now."

	-Charles

----------

def my_status_func(*args, **kwargs):

    """    Gather info from a running snob, and plot it.

    It expects the final arg to be a dictionary with
    the following keyword arguments:
          fig   --  the matplot figure for drawing to
          ax    --  the matplot axes in that figure
          t1    --  a list of length 1, with timestamp of last refresh
          iteratns --  sequence of all iteration #s to date (x axis)
          currlens --  sequence of all current lengths to date
          bestlens --  sequence of all best lenghts to date
    All of these kwargs will be modified, at least sometimes.

    """

    #global currlens, bestlens, iteratns, t
    UPDATE_INTERVAL = 1    # how long in s to wait before updating graph

    itr     = args[0] + 1
    max_itr = args[1]
    cl      = int (args[2][0] / N.log(2))
    bl      = int (args[3][0] / N.log(2))
    #cl = int (curr[0] / N.log(2))
    #bl = int (best[0] / N.log(2))


    # Extract variables from kwargs
    t1  = kwargs['t1']
    iteratns = kwargs['iteratns']
    currlens = kwargs['currlens']
    bestlens = kwargs['bestlens']

    iteratns.append (itr)
    currlens.append (cl)
    bestlens.append (bl)

    if itr == 1:
        print "Original length: ", cl

    delta = time.time() - t1[0]

    if (itr > 1) and ( (delta > UPDATE_INTERVAL) or (itr >= max_itr) ):
        # matplot has trouble if we plot just a single data point
        # so we wait for itr > 1

#        if not ShowOn().get():
#            ShowOn().set(True)

        fig = kwargs['fig']
        ax  = kwargs['ax']

        xlo, xhi = ax.get_xlim()
        xlo = max ( 0, xlo)  # Check bc original call is ignored
        xhi = max (50, xhi)  # Likewise
        if itr > xhi:
            xhi *= 2

        ax.set_xlim ([xlo, xhi])
        ax.set_ylim ( [ min(currlens), max(currlens) ] )
        plot(iteratns, currlens, 'b',
             iteratns, bestlens, 'r')


        fig.draw()   # schedule a refresh
        t1[0] = time.time()

    # Display any updates to the figure
    while gtk.events_pending():
        gtk.mainiteration()  # if running in normal gtk thread

    global interrupted
    if interrupted:
        return 1

    return snob.default_status_func(*args)

Pretty!

I just finished adding pseudo-color plots to matplotlib in the CVS
repository.

Here are a couple of screenshots

  http://nitace.bsd.uchicago.edu:8080/files/share/pcolor_demo_large.png

  http://nitace.bsd.uchicago.edu:8080/files/share/mri_with_eeg_large.png

The scripts that generated them are in examples/pcolor_demo.py and
examples/mri_with_eeg.png.

There is currently bug with pcolor in the GTK backend can cause a
vertical banding to appear due to integer rounding in very small
pcolor plots (eg, when you place the plot in a small subplot).  The GD
and PS backends work fine however.

Enjoy!
John Hunter

>>>>> "Parekh," == Parekh, Hardik (IndSys, GE Interlogix) <har...@ge...> writes:

    Parekh> Hi, I'm pretty impressed with the abilities of
    Parekh> matplotlib. But, I want to do dynamic plotting in
    Parekh> python. So does this tool support dynamic plotting? I
    Parekh> didn't see any snapshots or demo for dynamic plotting.

    Parekh> Please let me know if I can do dynamic plotting or not,
    Parekh> and if I can, how? Is there any tutorial on it?

Hi,

Thanks for the email.  In the future if you post the question to the
mailing list I'll be more likely to see it quickly and others can help
you as well
http://lists.sourceforge.net/mailman/listinfo/matplotlib-users.

Now, on to your question.  Yes, matplotlib does support dynamic
plotting, if I understand your question correctly.  You can update the
graphs in an animated fashion using either the gtk timer or idle
functionality.

See examples/system_monitor.py in the src distribution.  Let me know
if you need something other than this functionality, and I'll see
about getting it incorporated.

John Hunter

Gary Ruben wrote:

>Hi John,
>Just pre-empting Nathan's reply, a search revealed this:
><http://www.cairographics.org/>
>The reason I'm replying is to note that I'd vote for SVG support ahead of the currently X-specific Cairo. In fact I'd support WPG and WMF/EMF ahead of Cairo based on portability arguments. Yes, I'm primarily a Win32 user. Nathan may know something about how much simpler it would be to create a Cairo backend than an SVG backend which may argue against this.
>
Cairo is intended to have an svg backend because people want to be able 
to screenshot ->svg and print->svg and so on.  Also, cairo is an 
immediate mode system, suitable for interactive things, svg isn't.  
Having said that, either would be good, and svg would have greater value 
at the moment (cairo will be fast, but it ain't at the moment).

njh

John Hunter wrote:

>>>>>>"Nathan" == Nathan Hurst <nj...@ha...> writes:
>>>>>>            
>>>>>>
>
>    Nathan> has anyone investigated making a cario backend for
>    Nathan> matplotlib?  I'd do it myself (due to interests sake), but
>    Nathan> I have a supervisor breathing down my neck...
>
>I'm not familiar with it, and a quick google didn't turn up anything
>that looked relevant.  Do you have a link?
>
www.cairographics.org

the python-cairo interface works too.

njh

Hi John,
Just pre-empting Nathan's reply, a search revealed this:
<http://www.cairographics.org/>
The reason I'm replying is to note that I'd vote for SVG support ahead of the currently X-specific Cairo. In fact I'd support WPG and WMF/EMF ahead of Cairo based on portability arguments. Yes, I'm primarily a Win32 user. Nathan may know something about how much simpler it would be to create a Cairo backend than an SVG backend which may argue against this.
Gary

----- Original Message -----
From: John Hunter <jdh...@ac...>
Date: Wed, 29 Oct 2003 15:58:38 -0600
To: Nathan Hurst <nj...@ha...>
Subject: Re: [Matplotlib-users] Cairo backend

> >>>>> "Nathan" == Nathan Hurst <nj...@ha...> writes:
> 
>     Nathan> has anyone investigated making a cario backend for
>     Nathan> matplotlib?  I'd do it myself (due to interests sake), but
>     Nathan> I have a supervisor breathing down my neck...
> 
> I'm not familiar with it, and a quick google didn't turn up anything
> that looked relevant.  Do you have a link?
> 
> JDH
> 
> 
> 
> 
> 
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>>>>> "Juraj" == Juraj Krempasky <jur...@ps...> writes:

    Juraj> the afm files were missing probably because I made an rpm
    Juraj> package with python setup.py which I installed (I didn't do
    Juraj> the setup.py install).  Nevertheless the PS output by
    Juraj> setting the AFMPATH works fine. I really appreciate the
    Juraj> font management with matplotlib. However, for making plots
    Juraj> to be included in Latex I'd like to have the possibility to
    Juraj> scale also the axes fonts. For example Gnuplot knows a
    Juraj> command "set size" which then scales whole plot by leaving
    Juraj> all fonts the same - and this makes then small plots look
    Juraj> good. In matplotlib I can scale text, but I don't know how
    Juraj> to scale axes fonts along with axis labels. Is it possible?

Yes, this is possible.  You need to get a list of the text handles and
then set the text properties.  I'm away from my desk so I can't test
the code below, but here is the basic idea

# handle graphicsversion
t = gca().get_xticklabels()
set(t, 'fontsize', 12)

# or you can use object oriented interface
ax = subplot(211)
plot(something)
t = ax.get_xticklabels()
for label in t:
    t.set_fontsize(12)
    t.set_fontweight('bold')

I have been planning on modifying the axes constructor to take a font
dictionary (see help(text) for more info on font dictionaries) which
changes the default fonts for the axes, but haven't gotten to it.

But the approach above should work for you.  See the tutorial on the
web site for more info on setting text properties, and let me know if
you run into any troubles.

Good luck,
John Hunter

>>>>> "Nathan" == Nathan Hurst <nj...@ha...> writes:

    Nathan> has anyone investigated making a cario backend for
    Nathan> matplotlib?  I'd do it myself (due to interests sake), but
    Nathan> I have a supervisor breathing down my neck...

I'm not familiar with it, and a quick google didn't turn up anything
that looked relevant.  Do you have a link?

JDH

has anyone investigated making a cario backend for matplotlib?

I'd do it myself (due to interests sake), but I have a supervisor 
breathing down my neck...

njh

I just set up a new mailing list for discussion related to the
development of matplotlib.  Please join if interested.

John Hunter

>>>>> "Juraj" == Juraj Krempasky <jur...@ps...> writes:

 [ Standard response: please post questions to the mailing list
  when possible since others can benefit from the discussion, and
  provide help
  https://lists.sourceforge.net/lists/listinfo/matplotlib-users 
 ]

    Juraj> I suppose the above matplotlib.use('GTK') should be
    Juraj> matplotlib.use('PS'), isn't it?

Yes, that's correct.  Thanks for catching it.

    Juraj> But then I got the following message:

    Juraj> Error: Could not find any AFM files; please set AFMPATH to
    Juraj> point to some readable adobe font metric files

Matplotlib comes with a set of AFM files.  Did you do a normal 

  > python setup.py install

with matplotlib?  If so, distutils should put the files in a place
where matplotlib can find them even w/o setting AFMPATH (eg,
/usr/local/share/matplotlib or /usr/share/matplotlib).  If they are
not there, then my guess is something went funny with your install.
These files reside in the src distribution in the dir
matplotlib/fonts/afm, so you can get them there and set AFMPATH
accordingly.

The easiest way to find the AFM fonts on your system is to do

  > locate afm | less 

and see which dirs pop up.  On my system, dirs include
/usr/share/fonts/default/Type1, /usr/share/fonts/afms/adobe, etc...
They you can set your AFMPATH to point to these dirs.

    Juraj> Any idea where there files are on Linux RH7.3. The size is
    Juraj> then defined again like savefig('xx.ps',dpi=60)?

You don't need to set the DPI for a postscript file since postscript
is scalable.  The DPI is determined by your output device, eg, a
1200x1200 DPI printer.  This parameter is ignored by matplotlib on the
PS backend.

Good luck,
John Hunter

>>>>> "Samir" == Samir Patel <sp...@la...> writes:

    Samir> PS solution works for me. One thing is that afm fonts are
    Samir> in gnome-print package (Took me some time to find where
    Samir> this fonts came from). Now I am trying to see whether I can
    Samir> make it work with Quixote (web server). I will try GD
    Samir> solution later on. Thanks for your suggestions.  - Samir

matplotlib also ships with some AFM fonts which are put in a system
dir by the setup.py script.  They reside in the fonts/afm dir of the
matplotlib src distribution.  

I'm curious, postscript is usually not such a great format for serving
web images.  Do you plan on using a PS->PNG converter on the server
side?  By the way, if you are on linux, the GD setup is fairly
painless if you follow the steps in the "Quick install guide for GD
output" on http://matplotlib.sourceforge.net/backends.html.  I need to
generate some server side graphics myself -- that was one of my main
incentives for porting to GD.

Good luck -- if you have a publicly accessible web page serving up
matplotlib graphics in the future, let me know as I'd be interested in
checking it out.

JDH

First of all, one of the easiest graph package yet fill with tons of
capability and future potential.

Now my issue:

1. I am trying to integrate matplot with quixote. It fails because of gtk (I 
think). How can I use matplot  without gui requirement.

2. I am trying to save an image without showing it. Here is small program

**************************************************************
from matplotlib.matlab import *
plot([1,2,3])
savefig('test.png')
#show()

***************************************************************

This does not create test.png file, but if I uncomment last line, it create
test.png file. How can I create a test.png file without showing it?

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