matplotlib-users Mailing List for matplotlib

Hello,
I'm new to this list (but not matplotlib and basemap), and am not sure if
this is the place to post basemap questions. I apologise if I have erred.
I'm reporting an issue whereby if I try to plot a zoomed in orthographic
projection with a bluemarble (or etopo or shaded relief) background, the
background remains "global," though it's oriented to the correct location,
not mapping to the zoomed projection coordinates. I am pasting in a simple
demo code that illustrates the behaviour. If you use the lcc projection,
all works fine, and if you use a "non-zoomed" ortho projection, the
background maps correctly.
It seems that there is something preventing the background from mapping
into anything but a "complete-domain" ortho projection. I'm not a great
map person, and I realise I may be missing the boat on the way I'm trying
to zoom my ortho projection, but I'm not sure.
Am I screwing up, or is it a bug?
Thank you,
Don Morton
#---------------------------------------------------
import mpl_toolkits.basemap as bm
import matplotlib.pyplot as plt
import numpy as np
# Define a lambert conformal over northwest United States
# With this projection (centered on Montana, and zoomed in),
# the background image does map to the zoomed in projection
'''
theMap = bm.Basemap(projection='lcc',
 lat_0=47, lat_1=30, lat_2=60, lon_0=-115,
 llcrnrlat=43, llcrnrlon=-128,
 urcrnrlat=55, urcrnrlon=-105,
 resolution='i', area_thresh=1000)
'''
# With this projection (centered on Vienna, and zoomed in),
# the background image doesn't map to the zoomed in projection
theMap = bm.Basemap(projection='ortho',
 lat_0=48.2, lon_0=16.4,
 llcrnry=-1000000.0, llcrnrx=-1000000.0,
 urcrnry=1000000.0, urcrnrx=1000000.0,
 resolution='l', area_thresh=1000)
theMap.drawcountries()
theMap.drawcoastlines()
theMap.bluemarble()
#theMap.shadedrelief()
#theMap.etopo()
plt.show()
---
Don Morton, Owner/Manager
Boreal Scientific Computing LLC
Fairbanks, Alaska USA
http://www.borealscicomp.com/
http://www.borealscicomp.com/Miscellaneous/MortonBio/

In most cases, you can also query the artist object for which axes it
belongs to:
ax = a.get_axes()
Note that is can be None if it hasn't been attached anywhere.
Cheers!
Ben Root
On Tue, Apr 22, 2014 at 3:35 AM, Eric Firing <ef...@ha...> wrote:
> On 2014年04月21日 8:30 PM, Michael Mossey wrote:
> > How do I check if an artist is in the list of artists attached to an
> axes?
>
> if a in ax.get_children():
> ...
>
> Eric
> >
> > Mike
> >
> >
> >
> >
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Yes, there is a difference if you use the button versus explicitly stating
the dpi in a savefig call. When you use the button, matplotlib has to use
the default dpi since there is no other way to specify it.
Cheers!
Ben Root
On Mon, Apr 21, 2014 at 5:03 PM, Chao YUE <cha...@gm...> wrote:
> Yes, in fact I set dpi as 1000, which is already very high. In fact I have
> another question, will there be any difference if I use the save button on
> the interactive plotting toolbar and use the command line
> figure.savefig('xx.png',dpi=1000)?
>
> Chao
>
>
> On Mon, Apr 21, 2014 at 10:59 PM, Jody Klymak <jk...@uv...> wrote:
>
>> Did you set the dpi of the png?
>>
>> Cheers, Jody
>>
>>
>> On Apr 21, 2014, at 13:50 PM, ChaoYue <cha...@gm...> wrote:
>>
>> OK, I tried but I don't really see the difference between jpg and png by
>> my eyes in the attached case, maybe for other more complicated plots there
>> will be real difference. Anyway, thanks to all for your nice discussions.
>> And, BTW, I tried >2 hours trying to find a way to convert svg to emf, but
>> now I konw :p
>>
>> Cheers,
>>
>> Chao
>>
>>
>> On Mon, Apr 21, 2014 at 9:49 PM, Benjamin Root-2 [via matplotlib] <[hidden
>> email]> wrote:
>>
>>> JPGs will *always* have "bit blur" as it is a lossy image format. PNGs
>>> would be a better bet.
>>>
>>> Ben Root
>>>
>>>
>>> On Mon, Apr 21, 2014 at 3:33 PM, ChaoYue <[hidden email]<http://user/SendEmail.jtp?type=node&node=43265&i=0>
>>> > wrote:
>>>
>>>> Hi all,
>>>>
>>>> Thank you all for your kind response. I am sorry, but none of these
>>>> solutions significantly improved the visual quality on microsoft powerpiont
>>>> 2007. Thought I didn't try eps. So probably l have to go with the current
>>>> quality.
>>>> here is a best case I have now:
>>>> https://www.dropbox.com/s/0uhjogalz92hssm/different_figure_example.pptx
>>>> You can still see the "a bit blur" everywhere (currently with jpg being
>>>> inserted directly). I didn't have better quality than this one by trying
>>>> the method as suggested by you. Let me know if I am raising too much high
>>>> demand for this.
>>>>
>>>> Cheers,
>>>>
>>>> Chao
>>>>
>>>>
>>>> On Mon, Apr 21, 2014 at 4:41 PM, Jonathan Slavin [via matplotlib] <[hidden
>>>> email] <http://user/SendEmail.jtp?type=node&node=43264&i=0>> wrote:
>>>>
>>>>> ​Another alternative, if a vector graphics format doesn't work, is to
>>>>> make your png figure large. Then when you shrink it down to fit in your
>>>>> slide, it should still have good resolution.
>>>>>
>>>>> Jon​
>>>>>
>>>>> On Mon, Apr 21, 2014 at 10:13 AM, <[hidden email]<http://user/SendEmail.jtp?type=node&node=43262&i=0>
>>>>> > wrote:
>>>>>
>>>>>> No Powerpoint version I know supports SVG (or any vector graphics
>>>>>> format useful in this case) and Matplotlib does not
>>>>>> export WMF graphics anymore. So the easiest way is to use PNGs, if
>>>>>> you can live with raster graphics.
>>>>>>
>>>>>> Alternatively, if you need vector graphics, you can export the
>>>>>> Matplotlib plot as SVG and convert it to WMF or EMF using
>>>>>> Inkscape. This can be done in the command line like this:
>>>>>>
>>>>>> "c:\Program Files\Inkscape-0.48\inkscape.exe" --without-gui
>>>>>> --export-emf="output.emf" "input.svg"
>>>>>>
>>>>>>
>>>>>> Juergen
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ________________________________________________________
>>>>> Jonathan D. Slavin Harvard-Smithsonian CfA
>>>>> [hidden email] <http://user/SendEmail.jtp?type=node&node=43262&i=1>
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>>>>> ________________________________________________________
>>>>>
>>>>>
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>>>>
>>>>
>>>>
>>>> --
>>>> please visit:
>>>> http://www.globalcarbonatlas.org/
>>>>
>>>> ***********************************************************************************
>>>> Chao YUE
>>>> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
>>>> UMR 1572 CEA-CNRS-UVSQ
>>>> Batiment 712 - Pe 119
>>>> 91191 GIF Sur YVETTE Cedex
>>>> Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
>>>>
>>>> ************************************************************************************
>>>>
>>>> ------------------------------
>>>> View this message in context: Re: Make clear figure used in the
>>>> powerpoint slides?<http://matplotlib.1069221.n5.nabble.com/Make-clear-figure-used-in-the-powerpoint-slides-tp43252p43264.html>
>>>> Sent from the matplotlib - users mailing list archive<http://matplotlib.1069221.n5.nabble.com/matplotlib-users-f3.html>at
>>>> Nabble.com.
>>>>
>>>>
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>>>>
>>>
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>>>
>>> Start Your Social Network Today - Download eXo Platform
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>>>
>>
>>
>>
>> --
>> please visit:
>> http://www.globalcarbonatlas.org/
>>
>> ***********************************************************************************
>> Chao YUE
>> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
>> UMR 1572 CEA-CNRS-UVSQ
>> Batiment 712 - Pe 119
>> 91191 GIF Sur YVETTE Cedex
>> Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
>>
>> ************************************************************************************
>>
>> ------------------------------
>> View this message in context: Re: Make clear figure used in the
>> powerpoint slides?<http://matplotlib.1069221.n5.nabble.com/Make-clear-figure-used-in-the-powerpoint-slides-tp43252p43266.html>
>> Sent from the matplotlib - users mailing list archive<http://matplotlib.1069221.n5.nabble.com/matplotlib-users-f3.html>at
>> Nabble.com.
>>
>> ------------------------------------------------------------------------------
>> Start Your Social Network Today - Download eXo Platform
>> Build your Enterprise Intranet with eXo Platform Software
>> Java Based Open Source Intranet - Social, Extensible, Cloud Ready
>> Get Started Now And Turn Your Intranet Into A Collaboration Platform
>>
>> http://p.sf.net/sfu/ExoPlatform_______________________________________________
>> Matplotlib-users mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>>
>>
>>
>
>
> --
> please visit:
> http://www.globalcarbonatlas.org/
>
> ***********************************************************************************
> Chao YUE
> Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
> UMR 1572 CEA-CNRS-UVSQ
> Batiment 712 - Pe 119
> 91191 GIF Sur YVETTE Cedex
> Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
>
> ************************************************************************************
>
>
> ------------------------------------------------------------------------------
> Start Your Social Network Today - Download eXo Platform
> Build your Enterprise Intranet with eXo Platform Software
> Java Based Open Source Intranet - Social, Extensible, Cloud Ready
> Get Started Now And Turn Your Intranet Into A Collaboration Platform
> http://p.sf.net/sfu/ExoPlatform
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>

On 2014年04月21日 8:30 PM, Michael Mossey wrote:
> How do I check if an artist is in the list of artists attached to an axes?
if a in ax.get_children():
 ...
Eric
>
> Mike
>
>
>
> ------------------------------------------------------------------------------
> Start Your Social Network Today - Download eXo Platform
> Build your Enterprise Intranet with eXo Platform Software
> Java Based Open Source Intranet - Social, Extensible, Cloud Ready
> Get Started Now And Turn Your Intranet Into A Collaboration Platform
> http://p.sf.net/sfu/ExoPlatform
>
>
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

How do I check if an artist is in the list of artists attached to an axes?
Mike

Further update: I think I know how to do this. I can register a mouse event
handler, and its xdata and ydata properties will tell me the data
coordinates.
On Mon, Apr 21, 2014 at 4:17 PM, Michael Mossey <mic...@gm...>wrote:
> Note: I'm looking at the Picker examples now and one problem I see is that
> I'm not asking the user to click on data points, but anywhere on the axes.
>
>
> On Mon, Apr 21, 2014 at 3:49 PM, Michael Mossey <mic...@gm...>wrote:
>
>> For my application which is a simple sound file editor written with
>> matplotlib and PyQt4, I want to detect left and right clicks on the canvas.
>> I need to know the data coordinates of the click (i.e., not where on the
>> screen the click occurred, but what data point as defined by the axes it
>> represents). How do I do this?
>>
>> Mike
>>
>>
>

Why not save to PDF? Drops straight into Powerpoint...
M
On 4/21/14, 4:50 PM, ChaoYue wrote:
> OK, I tried but I don't really see the difference between jpg and png by
> my eyes in the attached case, maybe for other more complicated plots
> there will be real difference. Anyway, thanks to all for your nice
> discussions. And, BTW, I tried >2 hours trying to find a way to convert
> svg to emf, but now I konw :p
>
> Cheers,
>
> Chao
>
>
> On Mon, Apr 21, 2014 at 9:49 PM, Benjamin Root-2 [via matplotlib]
> <[hidden email] </user/SendEmail.jtp?type=node&node=43266&i=0>> wrote:
>
> JPGs will *always* have "bit blur" as it is a lossy image format.
> PNGs would be a better bet.
>
> Ben Root
>
>