matplotlib-users Mailing List for matplotlib

On Thu, Jan 28, 2010 at 3:02 PM, Adam Fraser <ada...@gm...> wrote:
> I thought I'd share a solution to the draggable legend problem since
> it took me forever to assimilate all the scattered knowledge on the
> mailing lists...
Cool -- nice example. I added the code to legend.py. Now you can do
leg = ax.legend()
leg.draggable()
to enable draggable mode. You can repeatedly call this func to toggle
the draggable state.
Thanks,
JDH

I thought I'd share a solution to the draggable legend problem since
it took me forever to assimilate all the scattered knowledge on the
mailing lists...
class DraggableLegend:
 def __init__(self, legend):
 self.legend = legend
 self.gotLegend = False
 legend.figure.canvas.mpl_connect('motion_notify_event', self.on_motion)
 legend.figure.canvas.mpl_connect('pick_event', self.on_pick)
 legend.figure.canvas.mpl_connect('button_release_event',
self.on_release)
 legend.set_picker(self.my_legend_picker)
 def on_motion(self, evt):
 if self.gotLegend:
 dx = evt.x - self.mouse_x
 dy = evt.y - self.mouse_y
 loc_in_canvas = self.legend_x + dx, self.legend_y + dy
 loc_in_norm_axes =
self.legend.parent.transAxes.inverted().transform_point(loc_in_canvas)
 self.legend._loc = tuple(loc_in_norm_axes)
 self.legend.figure.canvas.draw()
 def my_legend_picker(self, legend, evt):
 return self.legend.legendPatch.contains(evt)
 def on_pick(self, evt):
 legend = self.legend
 if evt.artist == legend:
 bbox = self.legend.get_window_extent()
 self.mouse_x = evt.mouseevent.x
 self.mouse_y = evt.mouseevent.y
 self.legend_x = bbox.xmin
 self.legend_y = bbox.ymin
 self.gotLegend = 1
 def on_release(self, event):
 if self.gotLegend:
 self.gotLegend = False
#...and in your code...
def draw(self):
 ax = self.figure.add_subplot(111)
 scatter = ax.scatter(np.random.randn(100), np.random.randn(100))
 legend = DraggableLegend(ax.legend())

I am also seeing this behavior and it is unfortunately holding my project
back. 
I have seen it with python 2.6 on Debian Linux and Windows XP. I have seen
it in version 0.99.1 and the latest SVN tree (as of yesterday). 
I want to highlight a portion of each 3d bar with another color. This image
shows what I want to do:
http://old.nabble.com/file/p27358778/bar3d-1.png 
(http://www.benaxelrod.com/temp/bar3d-1.png)
But rotating the view leads to rendering issues:
http://old.nabble.com/file/p27358778/bar3d-2.png 
(http://www.benaxelrod.com/temp/bar3d-2.png)
http://old.nabble.com/file/p27358778/bar3d-3.png 
(http://www.benaxelrod.com/temp/bar3d-3.png)
In this example, the bars are drawn next to each other. Here is the source
code to generate the images:
# code adapted from: hist3d_demo.py
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = Axes3D(fig)
x, y = np.random.rand(2, 100) * 4
hist, xedges, yedges = np.histogram2d(x, y, bins=4)
elements = (len(xedges) - 1) * (len(yedges) - 1)
xpos, ypos = np.meshgrid(xedges[:-1]+0.25, yedges[:-1]+0.25)
xpos = xpos.flatten()
ypos = ypos.flatten()
zpos = np.zeros(elements)
dx = 0.5 * np.ones_like(zpos)
dy = dx.copy()
dz = hist.flatten()
dx = dx*0.5
xpos = xpos - dx
ax.bar3d(xpos, ypos, zpos, dx, dy, dz, color='b')
ax.bar3d(xpos+dx, ypos, zpos, dx, dy, dz, color='r')
ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')
plt.show()
#end code
I also tried to overlap the bars, but the result was even worse because from
certain angles one of the colors was not visible at all.
I thought that the issue might be due to calling bar3d muliple times. So I
tried passing in an array of collors to bar3d with no luck. It seems that
bar3d only takes a single color. Is this planned to be fixed so that
bar3d() can take a color array just like bar()?
Also note that even very simple examples demonstrate the bug. For example:
http://old.nabble.com/file/p27358778/bar3d-4.png 
(http://www.benaxelrod.com/temp/bar3d-4.png)
http://old.nabble.com/file/p27358778/bar3d-5.png 
(http://www.benaxelrod.com/temp/bar3d-5.png)
Thanks,
-Ben
pierre-yves.debrito wrote:
> 
> Hi,
> I am currently using this version : matplotlib-0.99.1.win32-py2.6.exe 
> When I draw several Axes3D.bar3d in the same figure, as in this example, 
> the faces are not drawn in the correct order.
> Did I do something wrong or is it a rendering bug?
> Is there a workaround?
> 
> Thanks
> Pierre-Yves de Brito
> 
> 
> 
> 
> 
> from mpl_toolkits.mplot3d import Axes3D
> import matplotlib.pyplot as plt
> from numpy import array, arange
> 
> 
> contrib=[[0.18263,0.19098,0.16815,0.16295,0.09372,0.10505,0.15934],
> [0.00769,0.01315,0.01668,0.01645,0.03536,0.03493,0.00599],
> [0.47109,0.43646,0.43171,0.41794,0.14761,0.09472,0.21969],
> [0.25633,0.28820,0.34066,0.37184,0.68048,0.72773,0.57749],
> [0.06492,0.05539,0.03205,0.02151,0.03357,0.02411,0.01512]]
> 
> print contrib[0]
> N = 7
> ind = arange(N) # the x locations for the groups
> width = 0.1 # the width of the bars: can also be len(x) sequence
> 
> 
> I = array([1,1,1,1,1,1,1])
> 
> fig = plt.figure()
> ax = Axes3D(fig)
> 
> for i in range(1,7):
> ax.bar3d(ind[i], 0, 0, 0.1, 0.1, contrib[0][i], color='b')
> ax.bar3d(array(ind[i])+0.15, 0, 0, 0.1, 0.1, contrib[1][i], color='r'
> )
> ax.bar3d(array(ind[i])+2*0.15, 0, 0, 0.1, 0.1, contrib[2][i], color=
> 'g')
> ax.bar3d(array(ind[i])+3*0.15, 0, 0, 0.1, 0.1, contrib[3][i], color=
> 'c')
> ax.bar3d(array(ind[i])+4*0.15, 0, 0, 0.1, 0.1, contrib[4][i], color=
> 'm')
> 
> plt.show()
> 
> 
> 
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View this message in context: http://old.nabble.com/rendering-bug-in-bar3d-tp26413625p27358778.html
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Sharaf Al-Sharif wrote:
> Hi,
> I'm trying to make a figure with a column of contourf() subplots using 
> matplotlib.pyplot. The contour plots have the same levels and I only 
> need one color bar. The problem is that I'm not sure how to place the 
> color bar in the figure without messing up the alignment of the 
> subplots. Can someone kindly tell me how this can be done? Thanks in 
> advance.
See this example:
http://matplotlib.sourceforge.net/examples/pylab_examples/multi_image.html
and look at the colorbar docstring.
The example is probably more complicated than what you are talking 
about. The basic point, though, is that you need to explicitly make the 
axes for the colorbar, and supply that via the "cax" kwarg, instead of 
letting colorbar make its own axes by stealing space from some other 
axes object. You can still use a set of subplots; you may need to use 
subplots_adjust to scoot them up or over, to leave room for your colorbar.
Eric
> 
> Sharaf
> 
> 
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Sourav K. Mandal wrote:
> Hello,
> 
> I am using Matplotlib version 0.99.1.1.
> 
> I have a simple problem: when outputting to PDF or SVG, alpha blending
> does not work for the lines drawn by "contour". However, alpha blending
> does work for the regions given by "contourf". 
> 
You are right, this is a real bug, verified in svn. Since the agg 
backend works correctly and the pdf and svg backends do not, it appears 
to be essentially a bug in those backends. I am calling this to Jouni's 
attention, since he is the pdf backend expert; but in case neither he 
nor anyone else can get to it right away, if you have not seen any other 
response within a day, please file a bug report on the tracker so this 
doesn't get lost. If you do so, please use a simple and completely 
self-contained script to illustrate the problem.
http://sourceforge.net/tracker/?group_id=80706
Thank you.
Eric
> Both work when outputting to PNG.
> 
> My Python script (and data file) and example output (PDF, SVG, PNG) are
> posted here:
> 
> http://panic.berkeley.edu/~smandal/
> 
> Thank you!
> 
> 
> Regards,
> 
> Sourav
> 
> 
> 
> 
> 
> 
> 
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Hi,
I'm trying to make a figure with a column of contourf() subplots using
matplotlib.pyplot. The contour plots have the same levels and I only need
one color bar. The problem is that I'm not sure how to place the color bar
in the figure without messing up the alignment of the subplots. Can someone
kindly tell me how this can be done? Thanks in advance.
Sharaf

Hello,
I am using Matplotlib version 0.99.1.1.
I have a simple problem: when outputting to PDF or SVG, alpha blending
does not work for the lines drawn by "contour". However, alpha blending
does work for the regions given by "contourf". 
Both work when outputting to PNG.
My Python script (and data file) and example output (PDF, SVG, PNG) are
posted here:
http://panic.berkeley.edu/~smandal/
Thank you!
Regards,
Sourav

(Sorry for the missing text, this was my first post. Should probably
send as plain text!)
Hi,
I'm having trouble with the clabel command. When using auto mode, it
scatters the lables at non-optimal locations (see attached plot). When
trying to use the manual switch, the figure does not react to my mouse
clicks, and errors occur when trying to use the keyboard alternatives.
I'm using PythonXY 2.6.2.0, which includes Matplotlib 0.99.1.
I have seen a similar post on the list, which refers to an example
script ginput_manual_clabel.py, however, this script gives me the same
problems.
I can manually manipulate the label positions after plotting, by
accessing the text instances, but that does not move the breaks/holes
in the contour lines.
Any suggestions on how to solve this problem?
Thanks,
Thomas

It looks like EPD's version of matplotlib wasn't built with the _tkagg 
extension (it is an optional component). This e-mail thread [1] seems 
to suggest that it has gone in and out of EPD (though it's supposed to 
be back in 6.0). Of course, I don't usually run EPD or Windows myself, 
so I'm completely guessing, and am not trying to point fingers at the 
hard working guys at Enthought.
[1] 
http://markmail.org/message/e2g4kubwb7xkgyuo#query:epd%20python%20tkagg+page:1+mid:e2g4kubwb7xkgyuo+state:results
However, you may want to ask this question in an EPD support forum to 
see what they say.
Mike
Bradley Minch wrote:
> Hi everyone,
>
> I would like to develop a Tkinter GUI application for a course that I am teaching this semester that has an embedded matplotlib plot. I was hoping to have this application work with both the Mac OS X and Windows versions of Enthought Python Distribution v. 6.0.0. As a starting point, I was going to try the user interface examples, embedding_in_tk.py and embedding_in_tk2.py, on the matplotlib website. I have changed my default backend from WXAgg to TkAgg in my matplotlibrc file. With the Mac OS X version of EPD 6.0.0, the examples seem to work just fine. However, with the Windows version, I get the following import error:
>
> C:\Documents and Settings\bminch\Desktop>python embedding_in_tk2.py
> Traceback (most recent call last):
> File "embedding_in_tk2.py", line 6, in <module>
> from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationT
> oolbar2TkAgg
> File "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", lin
> e 8, in <module>
> import tkagg # Paint image to Tk photo blitter extension
> File "C:\Python26\lib\site-packages\matplotlib\backends\tkagg.py", line 1, in
> <module>
> import _tkagg
> ImportError: No module named _tkagg
>
> C:\Documents and Settings\bminch\Desktop>
>
> The same thing happens when I invoke ipython with the -pylab option, although with a traceback that is a bit longer. At the bottom of it is the same import error, "No module named _tkagg."
>
> Has anyone experienced similar problems with the TkAgg backend under the Windows version of EPD 6.0.0? Can anyone suggest how to fix the problem?
>
> Thanks,
> Brad Minch.
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Hi everyone,
I would like to develop a Tkinter GUI application for a course that I am teaching this semester that has an embedded matplotlib plot. I was hoping to have this application work with both the Mac OS X and Windows versions of Enthought Python Distribution v. 6.0.0. As a starting point, I was going to try the user interface examples, embedding_in_tk.py and embedding_in_tk2.py, on the matplotlib website. I have changed my default backend from WXAgg to TkAgg in my matplotlibrc file. With the Mac OS X version of EPD 6.0.0, the examples seem to work just fine. However, with the Windows version, I get the following import error:
C:\Documents and Settings\bminch\Desktop>python embedding_in_tk2.py
Traceback (most recent call last):
 File "embedding_in_tk2.py", line 6, in <module>
 from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationT
oolbar2TkAgg
 File "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", lin
e 8, in <module>
 import tkagg # Paint image to Tk photo blitter extension
 File "C:\Python26\lib\site-packages\matplotlib\backends\tkagg.py", line 1, in
<module>
 import _tkagg
ImportError: No module named _tkagg
C:\Documents and Settings\bminch\Desktop>
The same thing happens when I invoke ipython with the -pylab option, although with a traceback that is a bit longer. At the bottom of it is the same import error, "No module named _tkagg."
Has anyone experienced similar problems with the TkAgg backend under the Windows version of EPD 6.0.0? Can anyone suggest how to fix the problem?
Thanks,
Brad Minch.

OK, that worked. Sorry for the noise. I forgot basemap gets put under 
site-packages/mpl_toolkits. When I installed a second copy using the 
basemap binary installer, it went under site-packages and caused some 
sort of conflict.
Gary
Gary Ruben wrote:
> Hang on - I just noticed EPD says it contains basemap already, so maybe 
> installing over the top of it did something - I'll trying uninstalling 
> and doing a repair of EPD.
> 
> Gary
> 
> Gary Ruben wrote:
>> I just installed the latest EPD 6.0.2 Python 2.6-based distribution in 
>> WinXP. The mpl version is 0.99.1.1 and I installed basemap using the 
>> basemap-0.99.4.win32-py2.6.exe binary installer. I'm getting this 
>> traceback. Any ideas?
>> Gary

Hang on - I just noticed EPD says it contains basemap already, so maybe 
installing over the top of it did something - I'll trying uninstalling 
and doing a repair of EPD.
Gary
Gary Ruben wrote:
> I just installed the latest EPD 6.0.2 Python 2.6-based distribution in 
> WinXP. The mpl version is 0.99.1.1 and I installed basemap using the 
> basemap-0.99.4.win32-py2.6.exe binary installer. I'm getting this 
> traceback. Any ideas?
> Gary

I just installed the latest EPD 6.0.2 Python 2.6-based distribution in 
WinXP. The mpl version is 0.99.1.1 and I installed basemap using the 
basemap-0.99.4.win32-py2.6.exe binary installer. I'm getting this 
traceback. Any ideas?
Gary
--
In [1]: from mpl_toolkits.basemap import Basemap
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
C:\PYTHON26\<ipython console> in <module>()
C:\Python26\lib\site-packages\mpl_toolkits\basemap\__init__.py in <module>()
 36 from matplotlib.lines import Line2D
 37 from matplotlib.transforms import Bbox
---> 38 import pyproj, sys, os, math, dbflib
 39 from proj import Proj
 40 import numpy as np
C:\Python26\lib\site-packages\mpl_toolkits\basemap\pyproj.py in <module>()
 46 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """
 47
---> 48 from _proj import Proj as _Proj
 49 from _geod import Geod as _Geod
 50 from _proj import _transform
C:\PYTHON26\c_numpy.pxd in _proj (src/_proj.c:3234)()
ValueError: numpy.dtype does not appear to be the correct type object