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Jesper,
For performance reasons, what _make_barbs() does is create a (almost
degenerate) polygon for each wind barb in the data set. The barbs are drawn
such that y is along the barb, and x is perpendicular to the barb; the barb
is then rotated as appropriate. The first point in the polygon is IIRC the
tip of the barb, so all that would be needed is to add a few points at the
beginning of the polygon to draw an arrow head shapee. Of course, all of
this is deep implementation detail, subject to change in the future, but
subclassing the Barbs class and overriding the _make_barbs() method should
be relatively ok. (I'd start with a copy of _make_barbs() and tweak as
necessary)
Ryan
On Wed, Sep 17, 2014 at 6:29 AM, Jesper Larsen <jes...@gm...>
wrote:
> Hi matplotlib users
>
> I am developing an application for showing weather forecasts using
> matplotlib. We use wind barbs for displaying wind forecasts:
>
>
> http://api.fcoo.dk/ifm-maps/greenland/?zoom=6&lat=62&lon=-45&layer=FCOO%20Standard&overlays=TTFFFFFFFFFFFFFFF
>
> This is fine for our "power users". We do however also have some users who
> are not used to wind barbs. I have elsewhere seen people put a small arrow
> head at the foot of the wind barbs to make it more clear which direction
> the wind blows toward.
>
> As far as I can see from the matplotlib quiver.py code this is not
> possible with matplotlib. But the _make_barbs method does not seem that
> complicated so I wondered if it is something that I can do myself. I have
> however never used the matplotlib low level drawing primitives. I would
> therefore appreciate any good advice.
>
> Best regards,
> Jesper Baasch-Larsen
>
>
>
>
> ------------------------------------------------------------------------------
> Want excitement?
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> When you want reliability, choose Perforce
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>
-- 
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma

If you don't get an error message, and you don't get a window, it probably
means you matplotlib is defaulting to the Agg backend. The backend is set
by default in site-packages/matplotlib/mpl-data/matplotlibrc . What does
this report?:
import matplotlib
print(matplotlib.rcParams['backend'])
On my system, it reports 'Qt4Agg'. If your reports 'Agg', you can copy that
matplotlibrc file into your ~/.matplotlib directory, and edit the backend
based on whatever GUI toolkit you have installed or prefer.
Darren
On Tue, Sep 16, 2014 at 10:27 PM, 'Michiel de Hoon' via Anaconda - Public <
ana...@co...> wrote:
> The example works fine with matplotlib 1.4.0, python 3.4.0 (not from
> Anaconda) with Mac OS X Maverick.
>
> Best,
> -Michiel.
>
> --------------------------------------------
> On Wed, 9/17/14, Christophe Bal <pro...@gm...> wrote:
>
> Subject: [Matplotlib-users] Anaconda Mac or matplolib bug ?
> To: ana...@co..., mat...@li...
> Date: Wednesday, September 17, 2014, 2:19 AM
>
> Hello.
> I do not know the guilty people in this story.
> The following code works with Anaconda Python 3 on Lubuntu
> 14 but it does not with Anaconda Python 3 Mac OS Maverick.
> Why ?
> This message has been posted on both the list of
> Anaconda and the one of matplotlib.
> Christophe
> === Code ===
> # Source# * http://matplotlib.org/1.3.1/users/image_tutorial.html
> import matplotlib.pyplot as plt
> import matplotlib.image as mpimg
> impath = path2stinkbug_png"im =
> mpimg.imread(impath)
> implot = plt.imshow(im)
> plt.show()
>
>
> -----Inline Attachment Follows-----
>
>
> ------------------------------------------------------------------------------
> Want excitement?
> Manually upgrade your production database.
> When you want reliability, choose Perforce.
> Perforce version control. Predictably reliable.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk
> -----Inline Attachment Follows-----
>
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
>
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Hi matplotlib users
I am developing an application for showing weather forecasts using
matplotlib. We use wind barbs for displaying wind forecasts:
http://api.fcoo.dk/ifm-maps/greenland/?zoom=6&lat=62&lon=-45&layer=FCOO%20Standard&overlays=TTFFFFFFFFFFFFFFF
This is fine for our "power users". We do however also have some users who
are not used to wind barbs. I have elsewhere seen people put a small arrow
head at the foot of the wind barbs to make it more clear which direction
the wind blows toward.
As far as I can see from the matplotlib quiver.py code this is not possible
with matplotlib. But the _make_barbs method does not seem that complicated
so I wondered if it is something that I can do myself. I have however never
used the matplotlib low level drawing primitives. I would therefore
appreciate any good advice.
Best regards,
Jesper Baasch-Larsen

The example works fine with matplotlib 1.4.0, python 3.4.0 (not from Anaconda) with Mac OS X Maverick.
Best,
-Michiel.
--------------------------------------------
On Wed, 9/17/14, Christophe Bal <pro...@gm...> wrote:
 Subject: [Matplotlib-users] Anaconda Mac or matplolib bug ?
 To: ana...@co..., mat...@li...
 Date: Wednesday, September 17, 2014, 2:19 AM
 
 Hello.
 I do not know the guilty people in this story.
 The following code works with Anaconda Python 3 on Lubuntu
 14 but it does not with Anaconda Python 3 Mac OS Maverick.
 Why ?
 This message has been posted on both the list of
 Anaconda and the one of matplotlib.
 Christophe
 === Code ===
 # Source#  * http://matplotlib.org/1.3.1/users/image_tutorial.html
 import matplotlib.pyplot as plt
 import matplotlib.image as mpimg
 impath = path2stinkbug_png"im =
 mpimg.imread(impath)
 implot = plt.imshow(im)
 plt.show()
 
 
 -----Inline Attachment Follows-----
 
 ------------------------------------------------------------------------------
 Want excitement?
 Manually upgrade your production database.
 When you want reliability, choose Perforce.
 Perforce version control. Predictably reliable.
 http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk
 -----Inline Attachment Follows-----
 
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