Re: Legend on xy plots with multiple lines

Mary,
I used NhlAddData approach to deal with multiple lines with two y axes. I
use xyDashPattern, not xyDashPatterns.

On Tue, Sep 3, 2013 at 1:30 PM, Mary Haley <haley@ucar.edu> wrote:

> Xin,
>
> You can set the line patterns yourself using
> the "xyDashPatterns" resource, and that
> way know exactly which line patterns to
> use in the legend:
>
> res@xyDashPatterns = (/2,3,4/) ; just an example
> . . .
> plot = gsn_csm_xy(wks,x,y,res)
>
> lgres = True
> . . .
> lgres@lgDashIndexes = (/2,3,4/) ; or you can use lgres@lgDashIndexes= res@xyDashPatterns
> lgres@lgMonoDashIndex = False
>
> Or, you can retrieve the value of "xyDashPatterns" from
> the XY plot, and use this in your legend:
>
> plot = gsn_csm_xy(wks,x,y,res)
>
> getvalues plot@dataspec
> "xyDashPatterns" : dash_patterns
> end getvalues
>
> . . .
>
> lgres@lgDashIndexes = dash_patterns
> lgres@lgMonoDashIndex = False
>
>
> See example "leg_13.ncl" at:
>
> http://www.ncl.ucar.edu/Applications/legend.shtml
>
>
> This example is a bit lengthy, but it shows how to get information
> from an XY plot so you can reconstruct a legend from scratch.
>
> --Mary
>
> On Sep 3, 2013, at 9:43 AM, Xin Xi wrote:
>
> > Hello,
> > I am plotting multiple lines on a xy plot with two y axes, and use
> gsn_create_legend to attach a legend to the plot. I donot know how to make
> the line patterns in the legend consistent with the line plot. See attached
> script and figure. Any help is much appreciated.
> > Thanks.
> > Xin
> >
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>

-- 
*Xin Xi
School of Earth and Atmospheric Sciences
Georgia Institute of Technology
311 Ferst Drive, Atlanta, GA 30332-0340*

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Received on Tue Sep 3 11:41:47 2013