matplotlib-devel Mailing List for matplotlib

On Fri, Aug 31, 2007 at 03:32:09PM -0400, Michael Droettboom wrote:
> And placing bitmaps in menu items reportedly doesn't work at all on 
> wxCocoa. -- so maybe it's best to stay away from that altogether.

The wxPython demo.py for menus has a smiley face bit map that displays
just fine.  Let me know if you want a screen shot.

	- Paul

On Fri, Aug 31, 2007 at 03:28:49PM -0400, Michael Droettboom wrote:
> There is now preliminary support for getting a mathtext bitmap to 
> transfer to a GUI widget in SVN, along with a toy wxPython example in 
> examples/mathtext_wx.py.  I've only tested this on 
> Linux/wxGTK2/wxPython-2.8.  I'd appreciate help with testing (and 
> screenshots) on any other platforms you may care about.

That's wonderful!  I'm attaching a screen shot for wx 2.8 on OS/X.

The rendering is kind of ugly, but I haven't looked into it.

	- Paul

I should also mention my mathtext_wx.py example reveals a [possible] bug 
in wxPython-2.8 and/or the underlying Gtk.  When you put a bitmap on a 
menu item, the *height* of the menu item is determined by the *width* of 
the bitmap.

And placing bitmaps in menu items reportedly doesn't work at all on 
wxCocoa. -- so maybe it's best to stay away from that altogether.

Cheers,
Mike

Michael Droettboom wrote:
> There is now preliminary support for getting a mathtext bitmap to 
> transfer to a GUI widget in SVN, along with a toy wxPython example in 
> examples/mathtext_wx.py.  I've only tested this on 
> Linux/wxGTK2/wxPython-2.8.  I'd appreciate help with testing (and 
> screenshots) on any other platforms you may care about.
> 
> Gtk+ and Qt should also be theoretically possible.  Tk will be more 
> difficult, because a) it doesn't support an alpha channel (which would 
> mainly be a quality problem), and b) you have to use the _tkagg C++ 
> bridge to get the image data into a widget.
> 
> Be aware that the API for this may change due to my planned 
> mathtext/backend communication refactoring.  If you do plan on relying 
> on this functionality, I recommend wrapping it in a function (like 
> mathtext_to_wxbitmap in the example) so any future changes will be 
> localized.
> 
> Cheers,
> Mike
> 
> Michael Droettboom wrote:
>> Cool idea.  I don't know if anyone has tried this.  I assume you'd 
>> want to get something that you could pass to wx.ImageFromBuffer() (and 
>> the equivalent in Gtk).  It would just be a matter of or'ing together 
>> all of the greyscale ft2font buffers (which aren't currently exposed 
>> to Python) and converting them to an RGB buffer and Alpha buffer.  Not 
>> that difficult, but it would require some additional C routines in 
>> ft2font.cpp.
>>
>> (And long term, as cool as matplotlib is, it would be nice to refactor 
>> this out as a separate library for apps that don't do any plotting...)
>>
>> Cheers,
>> Mike
>>
>> Paul Kienzle wrote:
>>> Hi,
>>>
>>> It would be great to be able to display math markup in other parts of my
>>> application, such as labels, tables, lists and menus.  Has anyone ever
>>> tried doing this for wx or gtk?
>>>
>>> Thanks in advance,
>>>
>>>     - Paul
>>>
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> 

There is now preliminary support for getting a mathtext bitmap to 
transfer to a GUI widget in SVN, along with a toy wxPython example in 
examples/mathtext_wx.py.  I've only tested this on 
Linux/wxGTK2/wxPython-2.8.  I'd appreciate help with testing (and 
screenshots) on any other platforms you may care about.

Gtk+ and Qt should also be theoretically possible.  Tk will be more 
difficult, because a) it doesn't support an alpha channel (which would 
mainly be a quality problem), and b) you have to use the _tkagg C++ 
bridge to get the image data into a widget.

Be aware that the API for this may change due to my planned 
mathtext/backend communication refactoring.  If you do plan on relying 
on this functionality, I recommend wrapping it in a function (like 
mathtext_to_wxbitmap in the example) so any future changes will be 
localized.

Cheers,
Mike

Michael Droettboom wrote:
> Cool idea.  I don't know if anyone has tried this.  I assume you'd want 
> to get something that you could pass to wx.ImageFromBuffer() (and the 
> equivalent in Gtk).  It would just be a matter of or'ing together all of 
> the greyscale ft2font buffers (which aren't currently exposed to Python) 
> and converting them to an RGB buffer and Alpha buffer.  Not that 
> difficult, but it would require some additional C routines in ft2font.cpp.
> 
> (And long term, as cool as matplotlib is, it would be nice to refactor 
> this out as a separate library for apps that don't do any plotting...)
> 
> Cheers,
> Mike
> 
> Paul Kienzle wrote:
>> Hi,
>>
>> It would be great to be able to display math markup in other parts of my
>> application, such as labels, tables, lists and menus.  Has anyone ever
>> tried doing this for wx or gtk?
>>
>> Thanks in advance,
>>
>> 	- Paul
>>
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> 
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It would probably be considerable work to ply mathtext out of matplotlib, particularly if you consider bringing along the Ps/Pdf/Svg/Cairo backends.  Just bringing the raster backend (which is really in ft2font.cpp) would be considerably less work.

But I was mainly just sharing a "wouldn't it be cool if...".  Separating mathtext would be a project unto itself.

Cheers,
Mike

Hello,

it seems that there are two minor bugs in matplotlib concerning the 
logspace function.

1) line 93 of mlab.py:
def logspace(xmin,xmax,N):
   return exp(linspace(log(xmin), log(xmax),Nh))
- should be N or Nh in the both lines;

2) pylab  does not import logspace at all:
line 293 of pylab.py:
from matplotlib.mlab import linspace, ...
- should be
from matplotlib.mlab import linspace, logspace, ...

I have just found matplotlib, and it seems to me that it is very good 
and promising product, albeit not yet as polished as octave/gnuplot 
pair. The mathtext feature which eliminates all hassles with psfrag is 
especially useful.

Best wishes,
Farid.