matplotlib

Hello everyone,

in my programs I need the RectangleSelector. It's quiet easy to use but I 
discovered that there isn't a really easy way to switch it off once it is 
activated. I thought about  the following lines to matplotlib/widgets.py:

#--------------------------------------------------------------------------------------------
#at the beginning of RectangleSelector's __init__:
        ... docstring ...
        self.ax = ax					# like before
        self.visible = True				# like before
        self.canvas = ax.figure.canvas	# like before
        self.connect_id = []       # will contain the connection id's 
        self.active = True          #  for activation / deactivation
        self.is_active(True)
        ... snip ... 

#and an additional method:
#--------------------------------------------------------------------------------------------
def is_active(self, active):
        """ Use this to activate the RectangleSelector from your program.
        """
        self.active = active
        if active and len(self.connect_id) == 0: # you want to activate and it
                                                   #  isn't already active     
            self.connect_id.append(self.canvas.mpl_connect(
                  'motion_notify_event', self.onmove))
            self.connect_id.append(self.canvas.mpl_connect(
                  'button_press_event', self.press))
            self.connect_id.append(self.canvas.mpl_connect(
                  'button_release_event', self.release))
            self.connect_id.append(self.canvas.mpl_connect(
                  'draw_event', self.update_background))

        if not active and len(self.connect_id) != 0:  # you want to deactivate 
            for index in self.connect_id:     #  and it isn't already inactive  
                self.canvas.mpl_disconnect(index)
            self.connect_id = []
#--------------------------------------------------------------------------------------------

With  these changes you can check the following example:

#--------------------------------------------------------------------------------------------
from matplotlib.widgets import  RectangleSelector
from pylab import *

def onselect(eclick, erelease):
  'eclick and erelease are matplotlib events at press and release'
  print 'startposition : (%f,%f)'%(eclick.xdata, eclick.ydata)
  print 'endposition   : (%f,%f)'%(erelease.xdata, erelease.ydata)
  print 'used button   : ', eclick.button

def toggle_Selector(event):
    print "Key pressed."
    if event.key in ["Q", "q"] and toggle_Selector.RS.active:
        print " RectangleSelector deactivated."
        toggle_Selector.RS.is_active(False)
    if event.key in ["A", "a"] and not toggle_Selector.RS.active:
        print " RectangleSelector activated."
        toggle_Selector.RS.is_active(True)

x = arange(100)/(99.0)
y = sin(x)
fig = figure
ax = subplot(111)
ax.plot(x,y)

toggle_Selector.RS = RectangleSelector(ax, onselect,drawtype='box')
connect("key_press_event", toggle_Selector)
show()
#--------------------------------------------------------------------------------------------

I hope this is usefull to someone,
Martin

PS: Maybe the above example can replace the RectangleSelector's
docstring. I think it's easier to read and understand.

Hi,
unles I'm doing something stupid, setp is buggy.

I'm creating a bunch of images using imshow and I want the colormap to be
consistent among images. So once they're all drawn, I want to uniformize the
color scale. But

>>> setp(ax.images, clim= [0,1])

does not work because it sets vmin to [0,1] and doesn't affect vmax.

On the other hand,
>>> ax.images[0].set_clim([0,1])

works fine.

Should I file a ticket ?

David

In [1]: ax = axes()

In [2]: ax.imshow(rand(10,10))
Out[2]: <matplotlib.image.AxesImage instance at 0x2aaaad22a830>

In [3]: setp(ax.images, 'clim', [0,1])
---------------------------------------------------------------------------
exceptions.ValueError                                Traceback (most recent
call last)

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_gtk.py in
expose_event(self, widget, event)
    282                 x, y, w, h = self.allocation
    283                 self._pixmap_prepare (w, h)
--> 284                 self._render_figure(self._pixmap, w, h)
    285                 self._need_redraw = False
    286

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_gtkagg.py
in _render_figure(self, pixmap, width, height)
     71     def _render_figure(self, pixmap, width, height):
     72         if DEBUG: print 'FigureCanvasGTKAgg.render_figure'
---> 73         FigureCanvasAgg.draw(self)
     74         if DEBUG: print 'FigureCanvasGTKAgg.render_figure pixmap',
pixmap
     75         #agg_to_gtk_drawable(pixmap, self.renderer._renderer, None)

/usr/local/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py in
draw(self)
    390
    391         renderer = self.get_renderer()
--> 392         self.figure.draw(renderer)
    393
    394     def get_renderer(self):

/usr/local/lib/python2.4/site-packages/matplotlib/figure.py in draw(self,
renderer)
    567
    568         # render the axes
--> 569         for a in self.axes: a.draw(renderer)
    570
    571         # render the figure text

/usr/local/lib/python2.4/site-packages/matplotlib/axes.py in draw(self,
renderer, inframe)
   1105         if len(self.images)<=1 or renderer.option_image_nocomposite
():
   1106             for im in self.images:
-> 1107                 im.draw(renderer)
   1108         else:
   1109             # make a composite image blending alpha

/usr/local/lib/python2.4/site-packages/matplotlib/image.py in draw(self,
renderer, *args, **kwargs)
    179     def draw(self, renderer, *args, **kwargs):
    180         if not self.get_visible(): return
--> 181         im = self.make_image(renderer.get_image_magnification())
    182         l, b, widthDisplay, heightDisplay =
self.axes.bbox.get_bounds()
    183         renderer.draw_image(l, b, im, self.axes.bbox)

/usr/local/lib/python2.4/site-packages/matplotlib/image.py in
make_image(self, magnification)
    122                 im.is_grayscale = False
    123             else:
--> 124                 x = self.to_rgba(self._A, self._alpha)
    125                 im = _image.fromarray(x, 0)
    126                 if len(self._A.shape) == 2:

/usr/local/lib/python2.4/site-packages/matplotlib/cm.py in to_rgba(self, x,
alpha)
     54         if hasattr(x, 'shape') and len(x.shape)>2: return x
     55         x = ma.asarray(x)
---> 56         x = self.norm(x)
     57         x = self.cmap(x, alpha)
     58         return x

/usr/local/lib/python2.4/site-packages/matplotlib/colors.py in
__call__(self, value, clip)
    749         self.autoscale(val)
    750         vmin, vmax = self.vmin, self.vmax
--> 751         if vmin > vmax:
    752             raise ValueError("minvalue must be less than or equal to
maxvalue")
    753         elif vmin==vmax:

ValueError: The truth value of an array with more than one element is
ambiguous. Use a.any() or a.all()

Hello: 

I am getting an identical error to the error encountered by Charlie Moad
(posted Apr 10, 2006; 08:46am).  I am running Python 2.4.4 (#71, Oct 18
2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32 with Matplotlib v
0.87.7.  my system is:

XP home, SP2 on a Dell XPS600, Dual Core P4 3.40GHz, 1 GB RAM

the error thread is exactly the same:

Traceback (most recent call last):
  File "C:\Python24\test.py", line 33, in -toplevel-
    pylab.savefig(filename)#,dpi=100)
  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 813, in
savefig
    return fig.savefig(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 682, in
savefig
    self.canvas.print_figure(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 456, in print_figure
    self.draw()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 392, in draw
    self.figure.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 544, in
draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1063, in
draw
    a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 561, in draw
    tick.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 161, in draw
    if self.label1On: self.label1.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 838, in draw
    Text.draw(self, renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 340, in draw
    bbox, info = self._get_layout(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 187, in
_get_layout
    w,h = renderer.get_text_width_height(
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 239, in get_text_width_height
    texmanager = self.get_texmanager()
  File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line
413, in get_texmanager
    from matplotlib.texmanager import TexManager
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 61,
in -toplevel-
    class TexManager:
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 83,
in TexManager
    dvipngVersion = get_dvipng_version()
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 58,
in get_dvipng_version
    raise RuntimeError('Could not obtain dvipng version')
RuntimeError: Could not obtain dvipng version

I saw in the message thread that a fix was committed, is this universal?

many thanks,
bernard


-- 
View this message in context: http://www.nabble.com/matplotlib-vidpgn-version-error-tf3028905.html#a8415685
Sent from the matplotlib - devel mailing list archive at Nabble.com.

Hi,

this used to work a couple of months ago.

In [1]: from pylab import *

In [2]: mappable=cm.ScalarMappable(cmap=cm.jet)

In [3]: mappable.set_array(array([0,1]))

In [4]: cb=colorbar(mappable, orientation='horizontal')
---------------------------------------------------------------------------
exceptions.AttributeError                            Traceback (most recent
call last)

/home/huardda/Conferences/Luxembourg/src/<ipython console>

/usr/local/lib/python2.4/site-packages/matplotlib/pylab.py in
colorbar(mappable, cax, **kw)
    340     if mappable is None:
    341         mappable = gci()
--> 342     ret = gcf().colorbar(mappable, cax = cax, **kw)
    343     draw_if_interactive()
    344     return ret

/usr/local/lib/python2.4/site-packages/matplotlib/figure.py in
colorbar(self, mappable, cax, **kw)
    701         if cax is None:
    702             cax, kw = cbar.make_axes(ax, **kw)
--> 703         cb = cbar.Colorbar(cax, mappable, **kw)
    704         mappable.add_observer(cb)
    705         mappable.set_colorbar(cb, cax)

/usr/local/lib/python2.4/site-packages/matplotlib/colorbar.py in
__init__(self, ax, mappable, **kw)
    474         kw['cmap'] = mappable.cmap
    475         kw['norm'] = mappable.norm
--> 476         kw['alpha'] = mappable.get_alpha()
    477         if isinstance(mappable, ContourSet):
    478             CS = mappable

AttributeError: ScalarMappable instance has no attribute 'get_alpha'

Ciao,

David

There is a bug in PolygonInteractor -- the non-existent 'verts' is  
reference.  Note, there is a verts attribute in some of the inherited  
Polygon classes, but not in the Polygon class itself.  This is easy  
to fix.  Just remove the unnecessary line:

         self.poly.verts = list(self.poly.verts)

and change all references of poly.verts to poly.xy.

This works fine for me.  I found this while creating an interactive  
polygon creator, attached for those interested.  Feel free to use  
this routine however you wish.

Hi all,

Russell Owen just built an installer for MPL on OS_X for Python2.5, 
wxPython2.8.

To do it, he needed to patch

_wxagg.cpp, at line 238 as follows:

OLD:
wxBitmap *bitmap = new wxBitmap(image);
NEW
wxBitmap *bitmap = new wxBitmap(*image);

Thanks to a hint from Robin Dunn.

It now seems to work OK, except that when you use pylab.show() and then 
click on the toolbar buttons to zoom, etc, the buttons no longer display

Also, it doesn't work with Numeric 24.2 either -- I think that's a known 
issue, but I can't find a note about it at the moment.

Is anyone maintaining the wx back-end now?

Is MPL working with wxPython 2.8 on other platforms?

If anyone wants to try this binary out, it's temporarily at:

<http://www.astro.washington.edu/rowen/pythonpackages/Python%202.5/>


 >>> matplotlib.__version__
'0.87.7'
 >>> wx.__version__
'2.8.0.1'
 >>> numpy.__version__
'1.0.1'
 >>> Numeric.__version__
'24.2'


-Chris


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Oceanographer

Emergency Response Division
NOAA/NOS/OR&R            (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
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Chris.Barker@...

Hello:
I am getting an identical error to the error encountered by Charlie Moad
(posted Apr 10, 2006; 08:46am).  I am running Python 2.4.4 (#71, Oct 18
2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32 with Matplotlib v
0.87.7.  my system is:

XP home, SP2 on a Dell XPS600, Dual Core P4 3.40GHz, 1 GB RAM

the error thread is exactly the same:

Traceback (most recent call last):
  File "C:\Python24\test.py", line 33, in -toplevel-
    pylab.savefig(filename)#,dpi=100)
  File "C:\Python24\Lib\site-packages\matplotlib\pylab.py", line 813, in
savefig
    return fig.savefig(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 682, in
savefig
    self.canvas.print_figure(*args, **kwargs)
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 456, in print_figure
    self.draw()
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 392, in draw
    self.figure.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\figure.py", line 544, in
draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axes.py", line 1063, in draw
    a.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 561, in draw
    tick.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\axis.py", line 161, in draw
    if self.label1On: self.label1.draw(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 838, in draw
    Text.draw(self, renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 340, in draw
    bbox, info = self._get_layout(renderer)
  File "C:\Python24\Lib\site-packages\matplotlib\text.py", line 187, in
_get_layout
    w,h = renderer.get_text_width_height(
  File "C:\Python24\Lib\site-packages\matplotlib\backends\backend_agg.py",
line 239, in get_text_width_height
    texmanager = self.get_texmanager()
  File "C:\Python24\Lib\site-packages\matplotlib\backend_bases.py", line
413, in get_texmanager
    from matplotlib.texmanager import TexManager
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 61,
in -toplevel-
    class TexManager:
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 83,
in TexManager
    dvipngVersion = get_dvipng_version()
  File "C:\Python24\Lib\site-packages\matplotlib\texmanager.py", line 58,
in get_dvipng_version
    raise RuntimeError('Could not obtain dvipng version')
RuntimeError: Could not obtain dvipng version

I saw in the message thread that a fix was committed, is this universal?

many thanks,
bernard

I want to calculate the intersection of the edge of a marker with a line
running from the center to another marker. I want to do this in order to
decorate the intersection.


I'm using the following code(derived from some code in axes.py) to try
and "divine" the size:

        node_sz=sqrt(size*(ax.figure.dpi.get()/72.0))

This is not right. Clearly, I just don't have an idea what I'm doing
(when it comes to calculating the distance along a vector(the along a
vector part is easy) of the size of scatter marker). Anyway, who can
point me in the right direction would be my hero for atleast 2 or 3
hours.

-- 
Matt

Hi All,

I am new to this list, but a real fan of matplotlib, so I thought I would
post this here.  I am not sure if a bug report is more appropriate - please
let me know!

I have recently come across some font loading errors when using matplotlib
0.87.7-2 (and previous versions).  I have tracked these errors down to
font_manager.py in the matplotlib distribution, which is why I am emailing
you guys (I saw your email addresses in the file).

My installation details are as follows:  I am using python 2.5 with
matplotlib 0.87.7-2 on OSX 10.4 both installed with fink (
http://fink.sourceforge.net).  I also encountered the same errors I will
describe with python 2.3 and an earlier version of matplotlib.  I have 2
font path environment variables set TTFPATH=/sw/lib/X11/fonts/applettf, and
AFMPATH=/sw/share/texmf-dist/fonts/afm (/sw is where fink installs all
files).

The crux of the matter is that my TTFPATH directory contains a bunch of .ttf
files, while my AFMPATH directory contains subdirectories that themselves
contain .afm files.  The existing version of font_manager.py does not step
through these subdirectories, and thus none of my afm fonts were being
included in the search for fonts.  Furthermore, there was a problem in
parsing binary .ttf files when I was trying to load only ascii-encoded afm
files.

I tracked this down to the findSystemFonts(fontpaths,fontext) method in
font_manager.py and modified it in 2 places to step through subdirectories
(with os.walk), and to make sure it only loads the correct font with
extension fontext.  Below I give a diff of my modifications (each commented
with a #JBL), and the existing file:

diff font_manager.py font_manager_broken.py
42,43d41
< #JBL import re to match to file extension
< import re
209,212c207,208
<                     #JBL ONLY load if the proper fontext extension
<                     if re.match(fontext,f):
<                         fontfiles[f] = 1
<
---
>                     fontfiles[f] = 1
>
216,225c212,217
<     #JBL
<     #Supposed to be searching recursively here
<     # for path in fontpaths:
<     # use os.walk to walk through any directories listed
<     for root_path in fontpaths:
<         for path, dirs, file_names in os.walk(root_path):
<             files = glob.glob(os.path.join(path, '*.'+fontext))
<             files.extend(glob.glob(os.path.join(path,
'*.'+fontext.upper())))
<             for fname in files:
<                 fontfiles[os.path.abspath(fname)] = 1
---
>     for path in fontpaths:
>         files = glob.glob(os.path.join(path, '*.'+fontext))
>         files.extend(glob.glob(os.path.join(path, '*.'+fontext.upper())))
>         for fname in files:
>             fontfiles[os.path.abspath(fname)] = 1
>

These changes fix all the font loading problems I noticed.  I think this is
an important fix for those users that have installed fonts in non-standard
ways and who use the environment variables to point to them.  Do you
recommend me contributing this fix to the matplotlib project?  Should I make
a patch, or contribute via svn?

I hope this is helpful, and appreciate any feedback anyone can give.

Sincerely,

Julius B. Lucks

-----------------------------------------------------
http://openwetware.org/wiki/User:Lucks
-----------------------------------------------------

On Tue, 16 Jan 2007 09:38:54 +0800
  Steve Chaplin <stevech1097@...> wrote:
> On Mon, 2007-01-15 at 10:57 -0800,
> matplotlib-users-request@... wrote:
>>         Hi,
>>        =20
>>         I cannot install the latest matplotlib on=20
>>openSUSE10.2
>>         python setup.py install yields
>>        =20
> OK, I've updated _image.cpp to work on 64-bit systems=20
>with new versions
> of Python, but you will need to test it for me.
>=20
> Steve
>=20

Hi Steve,

This is to let you know that I was able to install
matplotlib via latest svn version. Thank you !

Cheers,
            Nils

On Thursday 11 January 2007 16:12, Darren Dale wrote:
> $ ipython
>
> In [1]: __import__('matplotlib.backends.backend_ps', globals(),\
> locals(),['backend_ps'])
>
> output:
> ---------------------------------------------------------------------------
> exceptions.AttributeError                            Traceback (most recent
> call last)
>
> /home/darren/<ipython console>
>
> /usr/lib64/python2.4/site-packages/matplotlib/backends/__init__.py
>      54
>      55 # a hack to keep old versions of ipython working with mpl
>      56 if 'IPython.Shell' in  sys.modules:
> ---> 57     new_figure_manager, draw_if_interactive, show = pylab_setup()
>      58
>
> /usr/lib64/python2.4/site-packages/matplotlib/backends/__init__.py in
> pylab_setup()
>      24     time.sleep(1)
>      25     backend_mod = __import__('matplotlib.backends.'+backend_name,
> ---> 26                              globals(),locals(),[backend_name])
>      27
>      28     # Things we pull in from all backends
>
> /usr/lib64/python2.4/site-packages/matplotlib/backends/backend_gtkcairo.py
>       7     import cairo.gtk
>       8
> ----> 9 import matplotlib.backends.backend_cairo as be_cairo
>      10 from   matplotlib.backends.backend_gtk import *
>      11
>
> AttributeError: 'module' object has no attribute 'backends'

I found a workaround, and committed it. I don't understand what the root of 
the problem was, probably because the AttributeError at the end of the 
Traceback is misleading. Changing this:

import matplotlib.backends.backend_cario as be_cairo

to this:

from matplotlib.backends import backend_cairo

and updating references to be_cairo was all that was needed. The fix is in svn 
2979.

Darren

On Mon, 15 Jan 2007 14:03:47 -0500
  Darren Dale <dd55@...> wrote:
> Nils,
>=20
> Please don't post to matplotlib when you have problems=20
>with svn-matplotlib.=20
> Post to matplotlib-devel.
>=20
> Darren
 =20
I have removed the build directory.

The CHANGELOG has a new entry

2007-01-15 src/_image.cpp combine buffer_argb32() and=20
buffer_bgra32() into
            a new method color_conv(format) - SC

I guess my installation problem is connected with that
change. Do you agree ?

Nils

 =20

On Thu, 11 Jan 2007, Rich Shepard wrote:

   The last output files are attached.

Thanks,

Rich

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