RE: [ncl-talk] Re: How to draw an arrow

Hi Craig,

Unless one of our developers corrects me, I'm afraid we don't have any
capabilities like this. I will add it to our enhancement request list.

We do have a related thing that you can do in 3-space. Please see
example 6 at:

   http://www.ncl.ucar.edu/Applications/tdpack.shtml#ex6

I have to make a point that this suite of 3-dimensional examples are
very limited in what they can do. The tdxxxx functions are a direct
interface to our low-level TDPACK package, and you don't have the same
kind of control over plot parameters as you do with things like
contours, XY plots, and vectors.

--Mary

On Thu, 25 Oct 2007, Motell, Craig E CIV NAVPACMETOCCEN JTWC, wrote:

> I would like to apply the arrow to trajectories. Problem is what should be the angle of the arrow.
>
> I will try to take the last two points say x1,y1 and x2,y2 and create a angle using dot product.
> Are they arrow examples using a trajectory script?
>
> Thank you,
> Craig
>
> ________________________________
>
> From: ncl-talk-bounces_at_ucar.edu on behalf of Mary Haley
> Sent: Wed 10/24/2007 5:15 AM
> To: ncl-talk_at_ucar.edu
> Subject: Re: How to draw an arrow
>
>
>
>
> Hi all,
>
> Fred created a more robust example, and we've added it to the
> applications page. Please see example 7 at:
>
> http://www.ncl.ucar.edu/Applications/weather_sym.shtml
>
> --Mary
>
>
> On Mon, 22 Oct 2007, Fred Clare wrote:
>
>>
>> On Oct 22, 2007, at 2:14 AM, Lawrence wrote:
>>
>>> Hi all,
>>>
>>> I want to draw a phase lock ( see the plot attached) using NCL. I have
>>> drawn the line using "gsn_polyline", but any tips for the arrow?
>>
>> Hi Lawrence,
>>
>> Arrows can be drawn using the wmlabs function:
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/wmlabs.shtml
>>
>> with the symbol set to "ARROW". The documentation in the
>> above is misleading - the description for "wks" should
>> indicate that it is the workstation where you want to
>> draw your symbols. Many symbols are available, arrows
>> being among them. See:
>>
>> http://www.ncarg.ucar.edu/ngdoc/ng/supplements/wmap/index.html#HEADING1-90
>>
>> The above documents Fortran/C interfaces, but it carries over to NCL.
>>
>> For arrows, you can control size, direction, body color,
>> outline color, shadow color, and tail size indpendently
>> of the tip. Ultimately the arrows drawn come from
>> the wmap package. For details on arrows see:
>>
>> http://ncarg.ucar.edu/ngdoc/ng4.4/supplements/wmap/#HEADING1-102
>>
>> In particular, for an explanation of the various control
>> parameters, visit the "table of internal parameters" link
>> at the above address. In NCL, values for the control
>> parameters can be set using the wmsetp function.
>>
>> Here is a trivial NCL script that draws a couple of arrows:
>>
>> load "$NCARG_ROOT/lib/ncarg/nclex/gsun/gsn_code.ncl"
>>
>> ;
>> ; Draw a couple of arrows
>> ;
>> begin
>>
>> wks = gsn_open_wks("x11","test_wmap")
>>
>> wmsetp("ARD",90.)
>> wmlabs(wks, 0.5, 0.5, "ARROW")
>> wmsetp("ARS",0.2)
>> wmsetp("ARD",180.)
>> wmlabs(wks, 0.5, 0.5, "ARROW")
>>
>> frame(wks)
>>
>> end
>>
>> Fred Clare
>>
>>>
>>> Regards,
>>>
>>> Lawrence
>>>
>>> <arrow.jpg>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> ncl-talk_at_ucar.edu
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
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>
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Received on Fri Oct 26 2007 - 09:27:50 MDT