matplotlib-devel Mailing List for matplotlib

On Wed, Jun 3, 2009 at 11:22 AM, John Hunter <jd...@gm...> wrote:
> so we may want to special case the code to handle 0.0, 0.0 as inputs.

Thanks a lot for tracking this down!
It would be best if my algorithm does not produce such a case, but
evidently it does. Yes, I'll put some code to treat this special case
and also see if I can avoid such cases by improving my algorithm.

Thanks again.

-JJ

On Wed, Jun 3, 2009 at 11:04 AM, Michael Droettboom <md...@st...> wrote:
> Jae-Joon,
>
> I just saw your curvelinear grid support fall into SVN.  Very
> impressive!  We actually may have a use for it here at Space Telescope
> for drawing "World Coordinate System (WCS)" plots.
>

Well, the WCS support is actually my whole motivation for this (I'm
also in astronomy).

> One quick question though -- it seems that this functionality is
> completely independent of the axes_grid stuff, which is primarily about
> layout out axes within a figure, correct?  Is there a reason why it's
> part of the axes_grid toolkit that I'm missing?
>

Well, axes_grid is actually a byproduct  of my effort to nicely
display FITS image with matplotlib. And I tend to put everything that
is not astronomy-specific into axes_grid toolkit, which may not be
such a good idea.

While one needs to use a custom Axes class (axes_grid.axislines.Axes)
to support the curvelinear grid, this part of the code can be easily
separated out. But I'm not sure if creating another mpl_toolkit
package is best way to do here. Any suggestion will be welcomed.
Regards,

-JJ


> Cheers,
> Mike
>
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
>
>
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On Wed, Jun 3, 2009 at 10:04 AM, Michael Droettboom <md...@st...> wrote:
> Jae-Joon,
>
> I just saw your curvelinear grid support fall into SVN.  Very
> impressive!  We actually may have a use for it here at Space Telescope
> for drawing "World Coordinate System (WCS)" plots.

I am getting an exception with a clean numpy/mpl build from svn HEAD>
This appears platform specific because I am only seeing it on my
solaris box at work, not on a linux box I am also testing on.

johnh@flag:axes_grid> uname -a
SunOS flag 5.10 Generic_118855-15 i86pc i386 i86pc

Here is the complete traceback:
Traceback (most recent call last):
  File "demo_curvelinear_grid.py", line 127, in ?
    plt.draw()
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/pyplot.py",
line 350, in draw
    get_current_fig_manager().canvas.draw()
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py",
line 215, in draw
    FigureCanvasAgg.draw(self)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py",
line 314, in draw
    self.figure.draw(self.renderer)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/figure.py",
line 774, in draw
    for a in self.axes: a.draw(renderer)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/axislines.py",
line 1350, in draw
    super(Axes, self).draw(renderer, inframe)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/artist.py",
line 46, in draw_wrapper
    draw(artist, renderer, *kl)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/matplotlib/axes.py",
line 1826, in draw
    a.draw(renderer)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/axislines.py",
line 874, in draw
    self._grid_helper.update_lim(self.axes)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/axislines.py",
line 564, in update_lim
    self._update(x1, x2, y1, y2)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/grid_helper_curvelinear.py",
line 114, in _update
    self._update_grid(x1, y1, x2, y2)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/grid_helper_curvelinear.py",
line 149, in _update_grid
    self.grid_info = self.grid_finder.get_grid_info(x1, y1, x2, y2)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/grid_finder.py",
line 241, in get_grid_info
    x1, y1, x2, y2)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/grid_finder.py",
line 118, in get_grid_info
    bb)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/grid_finder.py",
line 163, in _clip_grid_lines_and_find_ticks
    xy, tcks = clip_line_to_rect(lx, ly, bb)
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/clip_path.py",
line 72, in clip_line_to_rect
    ly3, lx3, c_top_ = clip(ly2, lx2, y1, clip="right")
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/clip_path.py",
line 51, in clip
    a = degrees(atan2(dy, dx))
ValueError: math domain error


In the debugger:

In [3]: %debug
> /home/titan/johnh/dev/lib/python2.4/site-packages/mpl_toolkits/axes_grid/clip_path.py(51)clip()
     50
---> 51                 a = degrees(atan2(dy, dx))
     52                 _pos_angles.append((x0, y0, a))

ipdb> print dy, dx
-0 0.0
ipdb> print type(dy), type(dx)
<type 'numpy.float64'> <type 'numpy.float64'>
ipdb> print atan2(dy, dx)
*** ValueError: math domain error

The root cause seems to be the math.atan2 function on solaris

In [4]: import math

In [5]: math.atan2(0., 0.)
------------------------------------------------------------
Traceback (most recent call last):
  File "<ipython console>", line 1, in ?
ValueError: math domain error

so we may want to special case the code to handle 0.0, 0.0 as inputs.

JDH

Jae-Joon,

I just saw your curvelinear grid support fall into SVN.  Very 
impressive!  We actually may have a use for it here at Space Telescope 
for drawing "World Coordinate System (WCS)" plots.

One quick question though -- it seems that this functionality is 
completely independent of the axes_grid stuff, which is primarily about 
layout out axes within a figure, correct?  Is there a reason why it's 
part of the axes_grid toolkit that I'm missing?

Cheers,
Mike

-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

On Tue, Jun 2, 2009 at 4:52 PM, Daniel <no...@dr...> wrote:
> Hello All,
>
> I have attached a patch that updates backend_fltkagg.py to use the new
> Transform APIs for 0.98.0
> (http://matplotlib.sourceforge.net/api/api_changes.html#notes-about-the-transforms-refactoring).
> Without these changes, trying to use FLTKAgg causes a crash with a very
> cryptic error.
>
> Thanks for all your work on matplotlib!

Thanks Daniel for the patch -- it looks like Michael has committed
this to the 98 release branch and merged it into the trunk, so it will
make the next release.

JDH

Hi again,
I have just installed matplotlib 0.98.5.3 and the problem seems to have
been fixed. But the movements are a lot slower though, (probably because
a lot more paint events were added?).

Thanks for the help.


-----Original Message-----
From: mat...@gm... [mailto:mat...@gm...] On Behalf Of
Sandro Tosi
Sent: Wednesday, June 03, 2009 12:35 PM
To: Alberto Soto; matplotlib development list
Subject: Re: [matplotlib-devel] re-draw problem with FigureCanvasQTAgg
in backend_qt4agg

Please keep the list in the loop: adding it again.

On Wed, Jun 3, 2009 at 12:16, Alberto Soto <alb...@lm...>
wrote:
> Hi Sandro,
>
> I have
> $ python -c "import matplotlib as mpl ; print mpl.__version__"
> 0.98.5.2
> Installed and am running PyQt v4.4.3 because I am forced to rest on
> Python 2.5
>
> I will try installing 0.98.5.3 and see if that makes a difference.
> I have seen the same problem in a Unix installation, I will try and
see
> which matplotlib version they were running.
>
> Meanwhile can you try re-sizing the dock widgets as fast as possible?
If
> you use the mouse to re-size them but do it gradually, the problem
does
> not surface.

oh sorry, the *dock*... I understood to resize the window. :(

Resizing the dock panel I see "part" of the problem": I see the
"shadow" on the matplotlib widget but not on the right dock (I'm
unable to screenshot though).

> Thank you and I will see what happened with the new instalation

You're welcome

-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

Hi Sandro,

I have 
$ python -c "import matplotlib as mpl ; print mpl.__version__"
0.98.5.2 
Installed and am running PyQt v4.4.3 because I am forced to rest on
Python 2.5

I will try installing 0.98.5.3 and see if that makes a difference.
I have seen the same problem in a Unix installation, I will try and see
which matplotlib version they were running.

Meanwhile can you try re-sizing the dock widgets as fast as possible? If
you use the mouse to re-size them but do it gradually, the problem does
not surface.

Thank you and I will see what happened with the new instalation

-----Original Message-----
From: mat...@gm... [mailto:mat...@gm...] On Behalf Of
Sandro Tosi
Sent: Wednesday, June 03, 2009 11:44 AM
To: Alberto Soto
Cc: mat...@li...
Subject: Re: [matplotlib-devel] re-draw problem with FigureCanvasQTAgg
in backend_qt4agg

Hi Alberto,

On Wed, Jun 3, 2009 at 10:49, Alberto Soto <alb...@lm...>
wrote:
> Good afternoon,
>
> I am working on a GUI that utilizes the FigureCanvasQTAgg. The GUI
consists
> of a Qt main window were the central widget includes a Figure. The
problem
> arises when this central widget interacts with re-size events of my
dock
> widgets. The Plot is not correctly re-drawn, it 'leaks' into the dock
> widgets.
>
> I think a picture would better describe this problem:
>
> Here we see 2 scripts running, the 1st one's dock widgets have been
re-sized
> by the user and the plot has 'leaked' into the right side dialog. The
second
> picture shows how the dialog normally looks.
>
>
>
> I am also attaching a simple script with the GUI that has the problem.
>
> If I move or do anything to re-trigger a paint event the plot is
re-drawn
> correctly.

I see no problem here. I'm on a debian sid OS, with

$ python -c "import matplotlib as mpl ; print mpl.__version__"
0.98.5.3

and

$ apt-show-versions python-qt4
python-qt4/testing uptodate 4.4.4-6

what do you have installed?

Regards,
-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

Please keep the list in the loop: adding it again.

On Wed, Jun 3, 2009 at 12:16, Alberto Soto <alb...@lm...> wrote:
> Hi Sandro,
>
> I have
> $ python -c "import matplotlib as mpl ; print mpl.__version__"
> 0.98.5.2
> Installed and am running PyQt v4.4.3 because I am forced to rest on
> Python 2.5
>
> I will try installing 0.98.5.3 and see if that makes a difference.
> I have seen the same problem in a Unix installation, I will try and see
> which matplotlib version they were running.
>
> Meanwhile can you try re-sizing the dock widgets as fast as possible? If
> you use the mouse to re-size them but do it gradually, the problem does
> not surface.

oh sorry, the *dock*... I understood to resize the window. :(

Resizing the dock panel I see "part" of the problem": I see the
"shadow" on the matplotlib widget but not on the right dock (I'm
unable to screenshot though).

> Thank you and I will see what happened with the new instalation

You're welcome

-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi

Hi Alberto,

On Wed, Jun 3, 2009 at 10:49, Alberto Soto <alb...@lm...> wrote:
> Good afternoon,
>
> I am working on a GUI that utilizes the FigureCanvasQTAgg. The GUI consists
> of a Qt main window were the central widget includes a Figure. The problem
> arises when this central widget interacts with re-size events of my dock
> widgets. The Plot is not correctly re-drawn, it ‘leaks’ into the dock
> widgets.
>
> I think a picture would better describe this problem:
>
> Here we see 2 scripts running, the 1st one’s dock widgets have been re-sized
> by the user and the plot has ‘leaked’ into the right side dialog. The second
> picture shows how the dialog normally looks.
>
>
>
> I am also attaching a simple script with the GUI that has the problem.
>
> If I move or do anything to re-trigger a paint event the plot is re-drawn
> correctly.

I see no problem here. I'm on a debian sid OS, with

$ python -c "import matplotlib as mpl ; print mpl.__version__"
0.98.5.3

and

$ apt-show-versions python-qt4
python-qt4/testing uptodate 4.4.4-6

what do you have installed?

Regards,
-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi