Hi Ryan,
Thanks for the insights. Your subclassing suggestions sounds fine to me.
Best regards,
Jesper
> Den 17/09/2014 kl. 21.49 skrev Ryan May <rma...@gmail.com>:
>
> 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 <jesper.webm...@gmail.com>
>> 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
>>
>>
>>
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>
>
>
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma
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