matplotlib-users Mailing List for matplotlib (Page 6)

On Tuesday 16 August 2005 5:50 am, Henry Proudhon wrote:
> Hi everyone,
>
> When you draw a picture with subplots, you can control the vertical and
> horizontal spaces between thanks to the "configure subplots" button in
> the toolbar.
> I'm sure there is a way to set the values of wspace and hspace manually
> but could'nt find it. That does not seems to be reported (yet) in the
> documentation.
>
> any clue ?

Try the axes([left, bottom, width height]) command to manually place your 
axes.

Darren

I am having a problem saving figures with any of the Agg backends.
Below is a sample of code and the resulting output.  I receive the same
type of errors with any of the Agg backends ie WxAgg, TkAgg ect.  With
SVG, or GD it does save.  I am running python 2.3 under windows XP
matplotlib .83.2.  Can you provide some guidance as to what I may have
configured wrong with the Agg backends?

Sample code run with -dAgg
                                                                         
                                                                         
                                                                         
   #!/usr/bin/env python                                                 
   from pylab import *                                                   
                                                                         
   plot(arange(10), color='#006400')                                     
   xlabel('this is a xlabel\n(with newlines!)')                          
   ylabel('this is vertical\ntest', multialignment='center')             
   #ylabel('this is another!')                                           
   text(2, 7,'this is\nyet another test',                                
        rotation=45,                                                     
        horizontalalignment = 'center',                                  
        verticalalignment   = 'top',                                     
        multialignment      = 'center')                                  
   savefig('c:\multiline.jpg')                                           
                                                                         
                                                                         
   Debug output                                                          
                                                                         
                                                                         
   loaded rc file C:\Python23\share\matplotlib\matplotlibrc              
   matplotlib version 0.83.2                                             
   verbose.level debug-annoying                                          
   interactive is False                                                  
   platform is win32                                                     
   loaded modules: ['pylab', '__future__', 'copy_reg', 'sre_compile',    
   'cm', 'locale', '_sre', '__main__', 'site', '__builtin__',            
   'datetime', 'thread', 'colors', 'numerix', 'encodings', 'os.path',    
   'encodings.encodings', 'matplotlib.sys', 'distutils.string',          
   'dateutil', 'matplotlib.datetime', 'strop', '_random', 'tempfile',    
   'errno', 'matplotlib.warnings', 'encodings.codecs', 'sre_constants',  
   're', 'ntpath', 'pytz.sys', 'UserDict', 'distutils.sysconfig',        
   'encodings.exceptions', 'nt', 'pytz.sets', 'math', 'stat',            
   'zipimport', 'string', 'warnings', 'encodings.types', '_codecs',      
   'sets', 'numerix.os', 'distutils.os', 'matplotlib',                   
   'encodings.cp1252', 'sys', 'pytz.tzinfo', 'pytz', 'pytz.datetime',    
   'matplotlib.__future__', 'codecs', 'distutils.re',                    
   'matplotlib.pytz', 'types', 'numerix.sys', 'matplotlib.dateutil',     
   '_locale', 'matplotlib.os', 'distutils', 'sre', 'bisect',             
   'matplotlib.distutils', 'signal', 'distutils.errors', 'random',       
   'linecache', 'itertools', 'time', 'exceptions', 'sre_parse',          
   'pytz.bisect', 'distutils.sys', 'os', 'matplotlib.tempfile']          
   numerix Numeric 23.8                                                  
   numerix Numeric 23.8                                                  
   font search path ['C:\\Python23\\share\\matplotlib']                  
   trying fontname C:\Python23\share\matplotlib\cmex10.ttf               
   trying fontname C:\Python23\share\matplotlib\cmmi10.ttf               
   trying fontname C:\Python23\share\matplotlib\cmr10.ttf                
   trying fontname C:\Python23\share\matplotlib\VeraMono.ttf             
   trying fontname C:\Python23\share\matplotlib\cmsy10.ttf               
   trying fontname C:\Python23\share\matplotlib\VeraSeBd.ttf             
   trying fontname C:\Python23\share\matplotlib\cmtt10.ttf               
   trying fontname C:\Python23\share\matplotlib\Vera.ttf                 
   $HOME=C:\Documents and Settings\cglackin                              
   CONFIGDIR=C:\Documents and Settings\cglackin\.matplotlib              
   loaded ttfcache file C:\Documents and                                 
   Settings\cglackin\.matplotlib\ttffont.cache                           
   font search path ['C:\\Python23\\share\\matplotlib']                  
   trying fontname C:\Python23\share\matplotlib\cmex10.ttf               
   trying fontname C:\Python23\share\matplotlib\cmmi10.ttf               
   trying fontname C:\Python23\share\matplotlib\cmr10.ttf                
   trying fontname C:\Python23\share\matplotlib\VeraMono.ttf             
   trying fontname C:\Python23\share\matplotlib\cmsy10.ttf               
   trying fontname C:\Python23\share\matplotlib\VeraSeBd.ttf             
   trying fontname C:\Python23\share\matplotlib\cmtt10.ttf               
   trying fontname C:\Python23\share\matplotlib\Vera.ttf                 
   loaded ttfcache file C:\Documents and                                 
   Settings\cglackin\.matplotlib\ttffont.cache                           
   matplotlib data path C:\Python23\share\matplotlib                     
   backend Agg version v2.2                                              
   backend_agg.new_figure_manager                                        
   FigureCanvasAgg.print_figure                                          
   FigureCanvasAgg.draw                                                  
   RendererAgg.__init__                                                  
   RendererAgg._get_agg_font                                             
       findfont failed Lucida Grande                                     
       findfont found Verdana, normal, normal 500, normal, 12.0          
   findfont returning C:\WINDOWS\Fonts\VERDANA.TTF                       
   RendererAgg._get_agg_font                                             
   RendererAgg.draw_text                                                 
   RendererAgg._get_agg_font                                             
   Traceback (most recent call last):                                    
   RendererAgg.points_to_pixels                                          
     File "C:\python projects\External Files\multiline.py", line 13, in  
   ?                                                                     
       savefig('c:\multiline.jpg')                                       
     File "C:\Python23\Lib\site-packages\matplotlib\pylab.py", line      
   773, in savefig                                                       
       return fig.savefig(*args, **kwargs)                               
     File "C:\Python23\Lib\site-packages\matplotlib\figure.py", line     
   636, in savefig                                                       
       self.canvas.print_figure(*args, **kwargs)                         
     File                                                                
   "C:\Python23\Lib\site-packages\matplotlib\backends\backend_agg.py",   
   line 444, in print_figure                                             
       self.draw()                                                       
     File                                                                
   "C:\Python23\Lib\site-packages\matplotlib\backends\backend_agg.py",   
   line 381, in draw                                                     
       self.figure.draw(renderer)                                        
     File "C:\Python23\Lib\site-packages\matplotlib\figure.py", line     
   511, in draw                                                          
       for a in self.axes: a.draw(renderer)                              
     File "C:\Python23\Lib\site-packages\matplotlib\axes.py", line       
   1387, in draw                                                         
       self.xaxis.draw(renderer)                                         
     File "C:\Python23\Lib\site-packages\matplotlib\axis.py", line 552,  
   in draw                                                               
       tick.draw(renderer)                                               
     File "C:\Python23\Lib\site-packages\matplotlib\axis.py", line 148,  
   in draw                                                               
       if self.tick1On: self.tick1line.draw(renderer)                    
     File "C:\Python23\Lib\site-packages\matplotlib\lines.py", line      
   399, in draw                                                          
       markerFunc(renderer, gc, xt, yt)                                  
     File "C:\Python23\Lib\site-packages\matplotlib\lines.py", line      
   999, in _draw_tickup                                                  
       path.move_to(-0.5, 0)                                             
     File "C:\Python23\Lib\site-packages\matplotlib\agg.py", line 809,   
   in move_to                                                            
       def move_to(*args): return _agg.path_storage_move_to(*args)       
   TypeError: argument number 1: a 'path_t *' is expected,               
   'path_storagePtr(<agg.path_storagePtr; proxy of C++                   
   agg::path_storage instance at _208aa401_p_agg__path_storage>)' is     
   received                                                              
                                                                         
                                                                         




CSG




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Hi everyone,

When you draw a picture with subplots, you can control the vertical and 
horizontal spaces between thanks to the "configure subplots" button in 
the toolbar.
I'm sure there is a way to set the values of wspace and hspace manually 
but could'nt find it. That does not seems to be reported (yet) in the 
documentation.

any clue ?

-- 

Henry Proudhon
Postdoc Fellow
Materials Engineering
The University of British Columbia
309-3650 Stores Road
V6T-1Z4 Vancouver B.C. (Canada)

Hi,

I really like the possibility to create labels with tex support.  
Unfortunately, using this feature, svg export seems to be no longer  
available. This is sad, because creating svg's was one of my major reasons  
using matplotlib. Using latex most of the time, it was possible to create  
high quality vector based images with the possibility to change them later  
(e.g. with inkscape). I use this feature mostly for language changings of  
labels or titles.

The error message:

Traceback (most recent call last):
   File  
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py",  
li                                                                  ne  
602, in save_figure
     self.canvas.print_figure(fname)
   File  
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py",                                                                    
line 114, in print_figure
     try: agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
   File  
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py",  
li                                                                  ne  
458, in print_figure
     svg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
   File  
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_svg.py",  
li                                                                  ne  
315, in print_figure
     self.figure.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 498,  
in dra                                                                  w
     for a in self.axes: a.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 1361,  
in draw
     self.xaxis.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 544, in  
draw
     tick.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 147, in  
draw
     if self.label1On: self.label1.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 847, in  
draw
     self._mytext.draw(renderer)
   File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 342, in  
draw
     renderer.draw_tex(gc, x, y, line,
AttributeError: RendererSVG instance has no attribute 'draw_tex'


Any idea, how to bring svg export back to work again ?

Regards

Werner

Hi all,

How do I install the missing software ?

/usr/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py:990:
GtkWarning: Could not find the icon 'gnome-fs-home'. The 'hicolor' theme
was not found either, perhaps you need to install it.
You can get a copy from:
        http://freedesktop.org/Software/icon-theme/releases
  buttons)

Nils

>>>>> "Darren" == Darren Dale <dd...@co...> writes:

    Darren> You can set the formatter back to the old behavior like
    Darren> this:

    Darren> from ticker import OldScalarFormatter a=axes()
    Darren> a.yaxis.set_major_formatter(OldScalarFormatter())

But will that help?  It will still fall over to exponential notation
at 1e4.  Perhaps a custom formatter will work better for you, eg
examples/custom_ticker1.py.

JDH

On Monday 15 August 2005 10:18 am, Maria Khomenko wrote:
> Hi,
>
> I noticed that the default scalar formatter turns on scientific notation
> once the numbers are over 10000. I was wondering if there is a way to turn
> off this option
> or at least change the settings to give matplotlib a different cut-off
> point for switching into scientific notation.
>
> I would appreciate some help with this,

You can set the formatter back to the old behavior like this:

from ticker import OldScalarFormatter
a=axes()
a.yaxis.set_major_formatter(OldScalarFormatter())



-- 
Darren S. Dale

Bard Hall
Department of Materials Science and Engineering
Cornell University
Ithaca, NY. 14850

dd...@co...
http://people.ccmr.cornell.edu/~dd55/

Hi,

I noticed that the default scalar formatter turns on scientific notation once
the numbers are over 10000. I was wondering if there is a way to turn off this
option 
or at least change the settings to give matplotlib a different cut-off point for
switching into scientific notation. 

I would appreciate some help with this,

Thanks,
Maria

Sorry, I answered this one but did not reply to all, so it didn't go to 
the list.  The equivalent matplotlib functions are xlim and ylim.

Ryan

John Hunter wrote:
>>>>>>"Nils" == Nils Wagner <nw...@me...> writes:
> 
> 
>     Nils> Hi all, How can I replace xplt.limits(xl,xu,yl,yu) in
>     Nils> matplotlib ?
> 
> Can you describe how this function performs and what the arguments
> mean?  Not all matplotlib users know scipy.xplt.
> 
> JDH
> 
> 
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> 

Hi Michael,

I'd the same kind of error installing pygtk on my Mandriva 10.2 (I'm a 
happy new linux user :-) )
The error occured checking Glib, and I had to specify the path of the 
.pc file manually by doing (I'm using bash):

export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/

where the file pygtk.pc was (it previously looked in /usr/lib/pkgconfig/)...
That solved the problem, I don't know if it can help you there, looks 
like you tried already, but it seemed to me it is a very similar problem...

Henry


Michael Nandris a écrit :

> Greetings, I have tried installing matplotlib from source, and also 
> from debian packages, and get the same error:
>
> >>> import pylab
>
> No module named pygtk
>
> PyGTK version 1.99.16 or greater is required to run the GTK Matplotlib 
> backends
>
> After sucessfully installing glib and atk using checkinstall, I tried 
> installing pygtk:
>
> ./configure
>
> .... lots of output...
>
> ... ...
>
> checking for GLIB - version >= 2.4.0... yes (version 2.6.3) <--- (so 
> checkinstall works)
>
> checking for atk >= 1.0.0... Package atk was not found in the 
> pkg-config search path.
>
> Perhaps you should add the directory containing `atk.pc' to the 
> PKG_CONFIG_PATH environment variable
>
> No package 'atk' found <--- ?
>
> configure: error: maybe you want the pygtk-2-2 branch?
>
> atk is installed and registered under dpkg -l, and after running 
> updatedb, atk.pc was found in /usr/local/lib/pkgconfig/atk.pc but is 
> not picked up by pkgconfig (same error as above).
>
> I temporarily set PKG_CONFIG_PATH=/usr/local/lib/pkgconfig followed by 
> ./configure and got exactly the same error as above (!*??!@!!!)
>
> pkg-config 0.15.0-4 is registered as a package, but I haven't got a 
> clue what it does or how to use it.
>
> Help, I need to get away from windows!
>
> Any advice?
>
> appreciations in advance
>
> Michael Nandris
>
> ------------------------------------------------------------------------
> Start your day with Yahoo! - make it your home page 
> <http://us.rd.yahoo.com/evt=34442/*http://www.yahoo.com/r/hs> 


-- 

Henry Proudhon
Postdoc Fellow
Materials Engineering
The University of British Columbia
309-3650 Stores Road
V6T-1Z4 Vancouver B.C. (Canada)

>>>>> "Nils" == Nils Wagner <nw...@me...> writes:

    Nils> Hi all, How can I replace xplt.limits(xl,xu,yl,yu) in
    Nils> matplotlib ?

Can you describe how this function performs and what the arguments
mean?  Not all matplotlib users know scipy.xplt.

JDH

>>>>> "Michael" == Michael Nandris <sui...@ya...> writes:

    Michael> Greetings, I have tried installing matplotlib from
    Michael> source, and also from debian packages, and get the same
    Michael> error:

It is easy to get the wrong debian package.  Did you do this:

    Add the following to /etc/apt/sources.list

      deb http://anakonda.altervista.org/debian packages/
      deb-src http://anakonda.altervista.org/debian sources/

     And then run:
      > sudo  apt-get update
      > sudo apt-get install python-matplotlib python-matplotlib-doc

If you have a successful install, you should be able to do

  >>> import matplotlib
  >>> print matplotlib.__version__

and get 0.82

    >>>> import pylab

    Michael> No module named pygtk

    Michael> PyGTK version 1.99.16 or greater is required to run the
    Michael> GTK Matplotlib backends

Note, matplotlib uses GTKAgg as the default backend, but I if you are
having trouble, I suggest trying the TkAgg, QtAgg or WXAgg backends,
which usew Tkinter, pyqt, and wxpython.  I suspect all of these are
available in your debian distribution.  See
http://matplotlib.sf.net/matplotlibrc for more information -- this is
where you choose your backend.  To make matters a little confusing,
between matplotlib 0.82 and 0.83 we changed the default location for
the rc file. 

  0.82: ~/.matplotlibrc
  0.83: ~/.matplotlib/matplotlibrc

Make sure you name it accordingly.

    Michael> After sucessfully installing glib and atk using
    Michael> checkinstall, I tried installing pygtk:

    Michael> checking for atk >= 1.0.0... Package atk was not found in
    Michael> the pkg-config search path.

I wonder if you also need all the -dev packages, eg gtk2-dev and so
forth.

Before you go and install a bunch of gtk stuff from src, you may want
to pursue getting the debian stuff working for you.  I know from
experience that it is easy to get a system out of whack if you have
some gtk stuff in /usr, more recent versions in /usr/local, and if you
are not very careful you are soon in a world of pain and considering a
clean reinstall.  Especially if you are not an experienced linux user,
as you indicated below.

    Michael> Help, I need to get away from windows! 

I use ubuntu linux -- if you are just getting started with linux and
haven't fully committed to a distribution I highly recommend it.  It's
an easy install, has good hardware support, a very modern desktop, and
so on.  It also has a good live/boot CD so you can test it out without
committing to it.

I maintain my own ubuntu debian packages for matplotlib and other
scientific computing packages for use on my own computers -- most of
the stuff I do typically requires having CVS versions of everything so
using the standard debs is not an option for me.  If you end up going
with ubuntu, let me know and I'll send you the repository information.


JDH

Greetings, I have tried installing matplotlib from source, and also from debian packages, and get the same error:

>>> import pylab

No module named pygtk

PyGTK version 1.99.16 or greater is required to run the GTK Matplotlib backends



After sucessfully installing glib and atk using checkinstall, I tried installing pygtk:

./configure

.... lots of output...

... ...

checking for GLIB - version >= 2.4.0... yes (version 2.6.3) <--- (so checkinstall works)

checking for atk >= 1.0.0... Package atk was not found in the pkg-config search path.

Perhaps you should add the directory containing `atk.pc' to the PKG_CONFIG_PATH environment variable

No package 'atk' found <--- ?

configure: error: maybe you want the pygtk-2-2 branch?



atk is installed and registered under dpkg -l, and after running updatedb, atk.pc was found in /usr/local/lib/pkgconfig/atk.pc but is not picked up by pkgconfig (same error as above). 



I temporarily set PKG_CONFIG_PATH=/usr/local/lib/pkgconfig followed by ./configure and got exactly the same error as above (!*??!@!!!)

pkg-config 0.15.0-4 is registered as a package, but I haven't got a clue what it does or how to use it. 

Help, I need to get away from windows! 

Any advice?

appreciations in advance

Michael Nandris


		
---------------------------------
 Start your day with Yahoo! - make it your home page 

On Fri, 12 Aug 2005, Gary apparently wrote: 
> TeX strings are 
> sometimes not rendered correctly unless I specify 
> a fontsize parameter: xlabel(r'Real part $\nu_r$', > fontsize=16) 

I added your comment to the Wiki list of hangups:
http://www.scipy.org/wikis/topical_software/UsingTex

Cheers,
Alan Isaac

>>>>> "Nils" == Nils Wagner <nw...@me...> writes:

    Nils> Hi all, I have some problems with xlabel. Sometimes the text
    Nils> is rotated (see ex3.png), but for what reason ?

    Nils> figure(3) plot(real(data_eig),imag(data_eig),'b.')
    Nils> xlabel(r'Real part $\nu_r$') ylabel(r'Imaginary $\nu_i$')
    Nils> savefig('ex3.png')

Hi Nils,

After thinking about this and reading through the matplotlib src code,
I have been able to infer that you

 * are working with a *Agg backend

 * have set the rc param usetex=True in your rc file or called
   rc('text', usetex=True) before the indicated commands

 * you have previously called code (perhaps in figure(1) or figure(2)
   not shown) with the x and y axes labels reversed.  

The reason for the bug is that backend agg caches the dvipng
information, and the key to this dictionary cache is not using the
angle (it should).  The following code reproduces the bug in *Agg

    rc('text', usetex=True)
    plot(rand(10), rand(10), 'b.')
    xlabel(r'Real part $\nu_r$')
    ylabel(r'Imaginary $\nu_i$')
    ylabel(r'Real part $\nu_r$')
    xlabel(r'Imaginary $\nu_i$')
                   
The fix: in matplotlib/backends/backend_agg.py on or around line 268,
replace

        key = s, size, dpi, rgb
        im = self.texd.get(key)

with 

        key = s, size, dpi, rgb, angle
        im = self.texd.get(key)

And next time, provide enough information that someone with less than
superhuman inferential powers can reproduce the bug.  A complete
example which reproduces it with any non-standard rc settings and the
output of your script run with --verbose-helpful would be much
obliged.

JDH

Hello all,

I'm attempting to overlay a vector field over an image. I have a vector
for every pixel. I'd like to be able to be able to only plot a subset of
those vectors.  For example, only plot every fifth vector in its place.

I've attached code that plots every vector.  Any suggestions on how to
modify it to plot every Nth vector? 

Thanks!!
JB


--
John Byrnes (by...@bu...)
Graduate Student
Electrical Engineering
Boston University

I can't reproduce this behavior, but I have found that TeX strings are 
sometimes not rendered correctly unless I specify a fontsize parameter: 
   xlabel(r'Real part $\nu_r$', fontsize=16)    for example.

-gary

Nils Wagner wrote:

>Hi all,
>
>I have some problems with xlabel. Sometimes the text is rotated (see
>ex3.png), but for what reason ?
>
>figure(3)
>plot(real(data_eig),imag(data_eig),'b.')
>xlabel(r'Real part $\nu_r$')
>ylabel(r'Imaginary $\nu_i$')
>savefig('ex3.png')
>
>Nils
>
> 
>
>  
>
>
> ------------------------------------------------------------------------
>

Hi all,

How can I replace xplt.limits(xl,xu,yl,yu) in matplotlib ?

Nils
 

Hi all,

I have some problems with xlabel. Sometimes the text is rotated (see
ex3.png), but for what reason ?

figure(3)
plot(real(data_eig),imag(data_eig),'b.')
xlabel(r'Real part $\nu_r$')
ylabel(r'Imaginary $\nu_i$')
savefig('ex3.png')

Nils

 

>> It works almost ok, but there are some quirks when repainting the 
>> window, (i) sometimes
>> the rulers are not erased and (ii) they are not redrawn when the 
>> window is fully repainted,
>> for example after being covered/discovered by other window. I want to 
>> put the
>> ruler redrawing routine into the paint event handler in order to see 
>> if this solves the
>> problem (which is caused by odd sequences of xor or invert -in my 
>> case- line plots).
>
> I suspect that this is exactly what you need to do to solve the 
> problem.  My approach in wxmpl has been to stop drawing the crosshairs 
> when the mouse is outside of the plot panel, which has allowed me to 
> sidestep this particular problem.

I have been experimenting a little using Blit() in the PaintDC to save 
the rulers
background to a MemoryDC before drawing them and then restoring this
buffer again via the "inverse" Blit(). It works pretty well, don't have the
odd-xor-sequence problem and the lines' colours are not altered by xoring
with the colours below.

Once I decide how to implement my widget (which include the rulers
and some map-coordination between two function plots) I will send you
my code as an example. Perhaps it could be useful for someone.

Regards,
Carlos

	

	
		
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zxo102 wrote:

> Hi there,
>   I would like to unsubscribe matplotlib. Anybody knows how to do 
> that?  Thanks
>  
> Ouyang

Follow the instructions at 
http://lists.sourceforge.net/lists/listinfo/matplotlib-users 
(specifically, at the bottom of the page where it says 'Matplotlib-users 
Subscribers').

-Jeff

-- 
Jeffrey S. Whitaker         Phone : (303)497-6313
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Hi there,
  I would like to unsubscribe matplotlib. Anybody knows how to do that?  Thanks
 
Ouyang

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On Aug 10, 2005, at 2:54 PM, Jeff Peery wrote:
> Hello, I am running WXAgg in a wxPython application.=A0 Within my=20
> application I have embedded a python shell.=A0 =46rom within the shell =
I=20
> want to run pyla. Will this conflict with WXAgg running in my WXApp?=20=

> Thanks.

I think everything should work okay, so long as you setup matplotlib to=20=

use WXAgg as the backend before pylab is imported:

	import matplotlib
	matplotlib.use('WXAgg')
	import pylab

However, pylab will manage its figure windows separately from the=20
FigureCanvasWxAgg instances you embed in your application.  If you need=20=

tighter integration (e.g. opening new figures in tabs of a window you=20
control), you'll need to write your own subclass of FigureManagerWx and=20=

make the WXAgg backend use it.  I'm not quite clear as to how you go=20
about doing so, but I'll be happy to help if I can.

Another caveat is that there is no way to make the figure frames=20
children of another frame (e.g. the main window of your application). =20=

wxPython applications usually hang around until all of the parentless=20
frames have been closed, so you could end up with an application that=20
stays open until all of the figure frames have been closed.  To prevent=20=

this, you'll need configure your wxApp instance to exit when the top=20
window is closed:

	class MyApp(wx.PySimpleApp):
		def OnInit(self):
			wx.PySimpleApp.OnInit(self)
			frame =3D MyMainFrame() # create the main window
			self.SetTopWindow(frame)
			self.SetExitOnFrameDelete(True)

Ken=

>>>>> "Ken" == Ken McIvor <mc...@ii...> writes:

    Ken> Since you're using wxPython, you've given my a plumb
    Ken> opportunity to repeat what is in danger of becoming my
    Ken> litany:

    Ken> 	You should check out Matt Newville's MPlot package and
    Ken> my wxmpl module, both of which exist to simply embedding
    Ken> matplotlib in wxPython applications.  Both of them provide
    Ken> user interaction bells and whistles, including crosshairs
    Ken> around the mouse position.

Perhaps a wiki entry on using mpl with wx would be helpful.

  http://www.scipy.org/wikis/topical_software/MatplotlibCookbook


JDH

On Aug 10, 2005, at 1:41 PM, Carlos Pita wrote:
>> The other alternative is to use GUI native drawing on top of the
>> matplotlib FigureCanvas; for the wx backend, there is an example
>> illustrating this in examples/wxcursor_demo.py.

Since you're using wxPython, you've given my a plumb opportunity to 
repeat what is in danger of becoming my litany:

	You should check out Matt Newville's MPlot package and my wxmpl 
module, both of which exist to 	simply embedding matplotlib in wxPython 
applications.  Both of them provide user interaction 	bells and 
whistles, including crosshairs around the mouse position.

Each of the libraries takes a different approach to plotting and has 
different benefits and drawbacks, so I encourage you to evaluate each 
of them and select the one that best meets your needs.  Even if neither 
of them fit the bill, you'll hopefully be able to learn something from 
looking through the source.

> It works almost ok, but there are some quirks when repainting the 
> window, (i) sometimes
> the rulers are not erased and (ii) they are not redrawn when the 
> window is fully repainted,
> for example after being covered/discovered by other window. I want to 
> put the
> ruler redrawing routine into the paint event handler in order to see 
> if this solves the
> problem (which is caused by odd sequences of xor or invert -in my 
> case- line plots).

I suspect that this is exactly what you need to do to solve the 
problem.  My approach in wxmpl has been to stop drawing the crosshairs 
when the mouse is outside of the plot panel, which has allowed me to 
sidestep this particular problem.

> The wx canvas implements its paint event hadler as a private _OnPaint 
> method.
> As long as encapsulation is a concern I wouldn't invoke it directly.

While I appreciate your concerns about breaking encapsulation, I don't 
think you'll have any problems overriding _OnPaint() to draw your 
crosshairs after the plot has been repainted.  As I indicated earlier, 
there are ways to design around needing to do so, but they entail not 
drawing crosshairs when the mouse is not in the window.

Ken