[ncl-talk] Fwd: Pennants wind barbs thickness

Fri Jul 25 13:26:47 MDT 2014

Thanks David.

Rabah.

2014-07-25 15:21 GMT-04:00 David Brown <dbrown at ucar.edu>:

> Hi Rabah,
> I have created a ticket for this issue: NCL-2005. No guarantee when we can
> attend to it, but we will put it in the queue.
>  -dave
>
>
> On Thu, Jul 24, 2014 at 4:11 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca>
> wrote:
>
>>
>>
>> Thanks for you David and Kyle.
>>
>>
>> 2014-07-24 18:08 GMT-04:00 David Brown <dbrown at ucar.edu>:
>>
>> Hi Rabah,
>>>
>>> I definitely agree with Kyle's advice. It would be a very time consuming
>>> (and not very rewarding) effort to try to create your own wind barbs using
>>> polylines and polygons. Post-processing the plot with adobe illustrator
>>> would be much easier.
>>>  -dave
>>>
>>>
>>>
>>> On Thu, Jul 24, 2014 at 1:41 PM, Kyle Griffin <ksgriffin2 at wisc.edu>
>>> wrote:
>>>
>>>> I would suggest making such an effect in a program like Adobe
>>>> Illustrator or similar - it would honestly be an order of magnitude faster
>>>> to do, or even to learn if you are unfamiliar with such software. In
>>>> reality though, it would probably be easier for you to simply choose
>>>> another color to plot in if you are worried about visibility.
>>>>
>>>> The implementation of such a procedure from your end would likely take
>>>> several days to accurately script and be terribly inefficient, as the
>>>> native NCL code is written in a more efficient language. It would also
>>>> still be lacking in many of the basic features that already exist. If you
>>>> really want to get started on such a project, I strongly suggest using the
>>>> NCL documentation as much as possible (including the search) and looking
>>>> over the polygon/polyline example page at
>>>> http://ncl.ucar.edu/Applications/polyg.shtml
>>>> I cannot possibly guide you beyond this as this is not something I
>>>> would recommend anyone try without being very familiar with the intricacies
>>>> of NCL or, preferably, the underlying code. That's why it's wonderful to
>>>> have such responsive developers helping us out and taking requests such as
>>>> these into consideration - even if these requests take a bit of time to
>>>> fully implement.
>>>>
>>>>
>>>> Kyle
>>>>
>>>> ----------------------------------------
>>>> Kyle S. Griffin
>>>> Department of Atmospheric and Oceanic Sciences
>>>> University of Wisconsin - Madison
>>>> Room 1421
>>>> 1225 W Dayton St, Madison, WI 53706
>>>> Email: ksgriffin2 at wisc.edu
>>>>
>>>>
>>>> On Thu, Jul 24, 2014 at 2:29 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca>
>>>> wrote:
>>>>
>>>>> Hi Kyle,
>>>>>
>>>>> My goal is overlay a green windbarb over a black ones with a higher
>>>>> thickness to get a green barb with a black borders like image attached.
>>>>> I success to do that but for winds speed over 50KT the problem about
>>>>> pennant occur.
>>>>>
>>>>> Please can you tell me what is steps to do to create a filled polygone
>>>>> and rotated it to the angle of each wind barb line.
>>>>>
>>>>> Thanks.
>>>>>
>>>>>
>>>>>  2014-07-24 15:13 GMT-04:00 Kyle Griffin <ksgriffin2 at wisc.edu>:
>>>>>
>>>>> As Dave is one of the developers, he does usually know best. However,
>>>>>> if it is very important to you to change it and you have a reasonable
>>>>>> number on your plot, I would recommend outputting your file as a PS, EPS,
>>>>>> or PDF and taking the vector file into a post-processing program such as
>>>>>> Adobe Illustrator or similar. There, you can edit the
>>>>>> length/width/color/position of the lines as necessary. Beyond that, I doubt
>>>>>> this feature is simple to address. If you were going to set about fixing
>>>>>> this as a user, you could start writing the code to draw each line
>>>>>> individually relative to a base point and use the gsn_add_polyline(...)
>>>>>> function or similar to try and construct these on your own. For the
>>>>>> pennants, you would likely need gsn_add_polygon(...) to create a filled
>>>>>> polygon, once again rotated to the angle of each wind barb line. Of course,
>>>>>> this would be duplicating much of the code already written
>>>>>> behind-the-scenes in NCL, but it IS possible if you really need a
>>>>>> customized implementation in the immediate future.
>>>>>>
>>>>>>
>>>>>> Kyle
>>>>>>
>>>>>> ----------------------------------------
>>>>>> Kyle S. Griffin
>>>>>> Department of Atmospheric and Oceanic Sciences
>>>>>> University of Wisconsin - Madison
>>>>>> Room 1421
>>>>>> 1225 W Dayton St, Madison, WI 53706
>>>>>> Email: ksgriffin2 at wisc.edu
>>>>>>
>>>>>>
>>>>>> On Thu, Jul 24, 2014 at 1:50 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca
>>>>>> > wrote:
>>>>>>
>>>>>>> Hi David,
>>>>>>>
>>>>>>> Yes i re-post my question maybe some one from NCL users has an other
>>>>>>> idea.
>>>>>>>
>>>>>>> Rabah
>>>>>>>
>>>>>>>
>>>>>>> 2014-07-24 14:11 GMT-04:00 David Brown <dbrown at ucar.edu>:
>>>>>>>
>>>>>>> Hi Rabah,
>>>>>>>> As you know I previously answered this question for you personally
>>>>>>>> prior to your joining ncl-talk. For the record I am now answering on
>>>>>>>> ncl-talk:
>>>>>>>>
>>>>>>>> You have diagnosed the problem correctly, and unfortunately there
>>>>>>>> is no resource to directly control the size of the pennant part of the wind
>>>>>>>> barb glyphs. The size and area of the pennants is fully determined by
>>>>>>>> the vcWindBarbTickLengthF and the vcWindBarbTickAngleF. Unfortunately there
>>>>>>>> is currently no adjustment made to account for the width of the lines,
>>>>>>>> which also has the effect of making the barbs longer than their nominal
>>>>>>>> length. No one has ever asked for this kind of flexibility in the past, but
>>>>>>>> I can see that it could be useful.
>>>>>>>>
>>>>>>>> You could try playing with the tick length and tick angle
>>>>>>>> resources. They may help give you a combination that looks better. But
>>>>>>>> until we can add another option, my suggestion would be to just try to keep
>>>>>>>> the width as small as feasible for your purposes.
>>>>>>>>  -dave
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Tue, Jul 22, 2014 at 4:54 PM, Rabah Hachelaf <
>>>>>>>> hachelaf at sca.uqam.ca> wrote:
>>>>>>>>
>>>>>>>>> Hi NCL users,
>>>>>>>>>
>>>>>>>>> I have problem with plotting wind barb with a relatively big
>>>>>>>>> thickness
>>>>>>>>>
>>>>>>>>> I am using vcWindBarbLineThicknessF command to increase wind barb
>>>>>>>>> thickness
>>>>>>>>> it's correct for all wind barbs only for higher than 50KT ones
>>>>>>>>> where the pennants or small triangle aren't affected by the thickness set.
>>>>>>>>> When reading some documentation i noted that
>>>>>>>>>
>>>>>>>>>   " The pennants are drawn using a filled polygon, while the
>>>>>>>>> ticks, the shaft, and the calm circle are all rendered with polylines.
>>>>>>>>> "
>>>>>>>>>
>>>>>>>>> So i think this is why pennants aren't affected by the thickness
>>>>>>>>> change.
>>>>>>>>>
>>>>>>>>> Have you some tricks to solve this problem and get the same
>>>>>>>>> pennants thickness like the ticks.
>>>>>>>>>
>>>>>>>>> Attached you can find an example of my case, where wind speed is
>>>>>>>>> supposed to be about between 55KT and 60KT
>>>>>>>>>
>>>>>>>>> Thank you.
>>>>>>>>>
>>>>>>>>> ------------------------------
>>>>>>>>> Cordialement,
>>>>>>>>> Best regards,
>>>>>>>>> Rabah Hachelaf
>>>>>>>>> Msc Studient UQAM
>>>>>>>>> Montréal/CANADA
>>>>>>>>>      ____
>>>>>>>>>     (       )
>>>>>>>>>    (        )
>>>>>>>>>   (___ __)
>>>>>>>>>    /////////
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> ncl-talk mailing list
>>>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> ------------------------------
>>>>>>> Cordialement,
>>>>>>> Best regards,
>>>>>>> Rabah Hachelaf
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> ncl-talk mailing list
>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ------------------------------
>>>>> Cordialement,
>>>>> Best regards,
>>>>> Rabah Hachelaf
>>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> ------------------------------
>> Cordialement,
>> Best regards,
>> Rabah Hachelaf
>>
>
>

-- 
------------------------------
Cordialement,
Best regards,
Rabah Hachelaf
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