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>
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Received on Wed Oct 24 2007 - 09:15:56 MDT