matplotlib-users Mailing List for matplotlib

On Feb 7, 2006, at 12:38 PM, John Hunter wrote:

>             if vers<'1.6':

This seemed to be the problem (perhaps vers<='1.6' is meant).  I use  
version dvipng version 1.6, but the alpha hack still seems to be  
required.  When I force the hack, the PNG output looks good.  Three  
cheers for the MPL-users list!  (Four for JDH!)

Now, if you'll bear with me, I need to get EPS (then, ultimately,  
encapsulated PDF) output.  I am getting an error like (from  
verbose:helpful) :

 >>> savefig('foo.eps')

[.....]

dvips: Font ecrm1000 at 72 not found; scaling 600 instead.
dvips: Such scaling will generate extremely poor output.


This is dvips(k) 5.95b Copyright 2005 Radical Eye Software  
(www.radicaleye.com)
' TeX output 2006.02.07:1621' -> /tmp/ 
bc5f66f5eb5ed881504e9f305289dc95.ps
<tex.pro><psfrag.pro><special.pro><color.pro>. [1
<bc5f66f5eb5ed881504e9f305289dc95.eps>]

GNU Ghostscript 8.16: Unrecoverable error, exit code 1



Any clues?

-Rob


-----
Rob Hetland, Assistant Professor
Dept of Oceanography, Texas A&M University
p: 979-458-0096, f: 979-845-6331
e: he...@ta..., w: http://pong.tamu.edu

>>>>> "Robert" == Robert Hetland <he...@ta...> writes:

    Robert>      dvipng is producing scaled images that look correct.

    Robert>    This command (at a variety of resolutions) produces
    Robert> nice, dithered output, even when using tex files from
    Robert> tex_cache.  See attached '3.0' at dpi=150.  Lovely...

Try hard coding the full path to dvipng from the command line and in
texmanager to make sure you are using the version you think you are.
Also, flush the tex cache.

Find this bit of code in texmanager

            vers = self.get_dvipng_version()
            #print 'dvipng version', vers
            if vers<'1.6':
                # hack the alpha channel as described in comment above
                alpha = sqrt(1-X[:,:,0])
            else:
                alpha = X[:,:,-1]

print the dvipng version in texmanager.  Also, see which part of the
conditional you are executing, and then manually try forcing both with 


            if 1:
                # hack the alpha channel as described in comment above
                alpha = sqrt(1-X[:,:,0])
            else:
                alpha = X[:,:,-1]


and

            if 0:
                # hack the alpha channel as described in comment above
                alpha = sqrt(1-X[:,:,0])
            else:
                alpha = X[:,:,-1]


Make sure you flush the tex cache and rerun matplotlib from the shell
(not ipython) with each test.

JDH

On Feb 7, 2006, at 11:06 AM, Darren Dale wrote:

> Are you using NumPy, Numeric, or numarray, and what version? What =20
> backend,
> GTKAgg, WXAgg? I'm grasping at straws here, maybe there is a =20
> problem with
> backen_agg's draw_image on your platform or with your =20
> configuration, but I
> can't investigate because I can't reproduce the problem.

NumPy (0.9.5.2044) and backend TkAgg

>
> Also, please try running dvipng -bg Transparent -D dpi -T tight =20
> dvifile,
> replacing dpi with numbers like 60, 80, 100, 140, just to make sure =20=

> that
> dvipng is producing scaled images that look correct.

This command (at a variety of resolutions) produces nice, dithered =20
output, even when using tex files from tex_cache.  See attached '3.0' =20=

at dpi=3D150.  Lovely...

-Rob.

=EF=BF=BC

-----
Rob Hetland, Assistant Professor
Dept of Oceanography, Texas A&M University
p: 979-458-0096, f: 979-845-6331
e: he...@ta..., w: http://pong.tamu.edu

Are you using NumPy, Numeric, or numarray, and what version? What backend, 
GTKAgg, WXAgg? I'm grasping at straws here, maybe there is a problem with 
backen_agg's draw_image on your platform or with your configuration, but I 
can't investigate because I can't reproduce the problem.

Also, please try running dvipng -bg Transparent -D dpi -T tight dvifile, 
replacing dpi with numbers like 60, 80, 100, 140, just to make sure that 
dvipng is producing scaled images that look correct.

Darren

On Tuesday 07 February 2006 11:19, Robert Hetland wrote:
> I have tried the key utilities by hand (latex & dvipng).  I even went
> into the tex_cache and processed one of those tex files by hand as
> well.  This all works for me.  In particular, the font rendered in
> png is dithered, while in the matplotlib, on my screen and using
> savefile, the font is *not* dithered on either the axis or in text
> ().  The file Darren sent is also nicely dithered.  See the attached
> zoomed sample of non-dithered text.  Oh, so ugly...
>
> I am using Mac OS X 10.4, a recent distribution of teTeX from the i-
> Installer (the same as recommended by TeXShop), gnu-gs 8.16, CVS
> matplotlib 0.86.2, etc.  (I think this is all the relevant info for
> now..)
>
> relevant rc stuff:
>
> text.usetex         : True   # use latex for all text handling.  See
>
> ps.papersize      : letter   # executive, letter, legal, ledger, A0-
> A10, B0-B6, C0-C6
> ps.useafm         : False    # use of afm fonts -- breaks mathtext
> but results in small files
> ps.usedistiller   : None     # can be: None, ghostscript or xpdf
>                                            # Experimental: may
> produce smaller files.
>                                            # xpdf intended for
> production of publication quality files,
>                                            # but requires
> ghostscript, xpdf and ps2eps
> ps.distiller.res  : 6000      # dpi
>
>
> -Rob.
>
> p.s. Ryan - I think the web page should be clear now.  My sysadmin
> had gone a little overboard on blocking IPs after a hacker
> infestation...  (my guess is you were surfing from home, right?)

-- 
Darren S. Dale, Ph.D.
Cornell High Energy Synchrotron Source
Cornell University
200L Wilson Lab
Rt. 366 & Pine Tree Road
Ithaca, NY 14853

dd...@co...
office: (607) 255-9894
fax: (607) 255-9001

Ryan Krauss wrote:
> I would like to draw one arrow on a plot as part of a label. 

> Does anyone have a better way to do this?

I've enclosed a message sent to matplotlib-devel, including the attached 
code. maybe it will help, I haven't had a chance to try it out yet.

-Chris


-------- Original Message --------
Subject: Fancy arrows for matplotlib
Date: Tue, 31 Jan 2006 16:03:13 -0700
From: Fernando Perez <Fer...@co...>
Organization: Applied Mathematics, University of Colorado at Boulder
To: matplotlib development list 
<mat...@li...>, Chris Barker 
<Chr...@no...>, Rob Knight <ro...@sp...>

Hi all,

I thought I had sent this code on Sunday, but apparently it didn't make 
it to
the list.  Apologies if it arrives twice.

This code was contributed by Rob Knight, from the biochemistry dept. at CU
Boulder, to draw nice arrows with a lot of control.

You can see an example here (just paste the example data):

http://bayes.colorado.edu/cgi-bin/arrows/arrow_cgi.py

Both a CGI and a command line demo are attached, as well as the underlying
arrow-drawing code.  It would be great if this could be integrated into mpl
for the future.

Cheers,

f


-- 
Christopher Barker, Ph.D.
Oceanographer
                                     		
NOAA/OR&R/HAZMAT         (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chr...@no...

Please be kind....poor starving newbie.

I've seen this question posted around but can't seem to find an answer: does anybody have experience creating an .exe for a matplotlib program using py2exe? 

My testMPL.py application is all set to go, but when I run py2exe with the suggested setup.py file, I get errors. (I'm using ActiveState Python 2.4.2 Build 10)

Setup.py is as follows:

from distutils.core import setup
import glob
import py2exe

opts = {
    'py2exe': { 'includes': 'matplotlib.numerix.random_array',
                'excludes': ['_gtkagg', '_tkagg'],
                'dll_excludes': ['libgdk-win32-2.0-0.dll',
                                 'libgobject-2.0-0.dll']
              }
       }
       
data = glob.glob("C:\\Python24\\Lib\\site-packages\\matplotlib\\*")
data.append("C:\\Python24\\Lib\\site-packages\\matplotlib\\matplotlibrc")

setup ( console = ["testWX.py"], 
        data_files=[("matplotlibdata",data)])

    
Now, when I run this, setup.py ends with an error as follows:

*** copy extensions ***
*** copy dlls ***
*** copy data files ***
error: can't copy 'C:\Python24\Lib\site-packages\matplotlib\backends': doesn't e
xist or not a regular file


Is this error because glob can't load files recursively? I get confused because all of the other examples out there use a different file structure, loading matplotlib files like so...

 data_files = [(r'matplotlibdata', glob.glob(r'c:\python24\share\matplotlib\*')),
                  (r'matplotlibdata', [r'c:\python24\share\matplotlib\.matplotlibrc'])],
But my python build doesn't have a /share  directory at all. Why the discrepency?

Thanks for any help...

- Daniel


 
===================================== 
Daniel McQuillen, 
Oakland, CA 
www.bluepattern.com

I have tried the key utilities by hand (latex & dvipng).  I even went  
into the tex_cache and processed one of those tex files by hand as  
well.  This all works for me.  In particular, the font rendered in  
png is dithered, while in the matplotlib, on my screen and using  
savefile, the font is *not* dithered on either the axis or in text 
().  The file Darren sent is also nicely dithered.  See the attached  
zoomed sample of non-dithered text.  Oh, so ugly...

I am using Mac OS X 10.4, a recent distribution of teTeX from the i- 
Installer (the same as recommended by TeXShop), gnu-gs 8.16, CVS  
matplotlib 0.86.2, etc.  (I think this is all the relevant info for  
now..)

relevant rc stuff:

text.usetex         : True   # use latex for all text handling.  See

ps.papersize      : letter   # executive, letter, legal, ledger, A0- 
A10, B0-B6, C0-C6
ps.useafm         : False    # use of afm fonts -- breaks mathtext  
but results in small files
ps.usedistiller   : None     # can be: None, ghostscript or xpdf
                                           # Experimental: may  
produce smaller files.
                                           # xpdf intended for  
production of publication quality files,
                                           # but requires  
ghostscript, xpdf and ps2eps
ps.distiller.res  : 6000      # dpi


-Rob.

p.s. Ryan - I think the web page should be clear now.  My sysadmin  
had gone a little overboard on blocking IPs after a hacker  
infestation...  (my guess is you were surfing from home, right?)

I would like to draw one arrow on a plot as part of a label.  I am
currently doing the following:

ax=3Dgca()
myarrow=3Dpylab.Arrow(-30,60,10,10,width=3D10)
ax.add_patch(myarrow)
pylab.show()

If I leave width=3D1, my arrow head is not visible due to the scale of
my plot, with width=3D10, the arrow head is visible, but the overall
arrow is wider than I would like.  Is there another way to do this?=20
Can I get seperate control over the width of the arrowhead and the
width of the arrow.  I wouldn't mind if the arrow itself was just a
thin line, but I would like a fancy arrow head than just doing this
-----> by drawing three lines.

Does anyone have a better way to do this?

Ryan