Re: problem by adding legend for plotting

Hi Ping,

I'm not sure if the problem is with the actual drawing itself, or the positioning of the annotation.

Right after you call gsn_create_legend, can you call:

draw(lbid)
frame(pwks)

And also right after you call gsn_add_annotation, can you call:

draw(plot)
frame(pwks)

and send me the resultant PS figures?

Thanks,

--Mary

On Oct 15, 2012, at 4:43 PM, Ping Yang wrote:

> Hi NCL,
>
> I followed the example xy_20(http://www.ncl.ucar.edu/Applications/Scripts/xy_20.ncl) for adding a legend to plot, but failed, the code I used:
> ;************************************************
> ; create plots: Three res for three variables.
> ;************************************************
> pwks = gsn_open_wks("ps" ,"ISIMIP_MERRA_NCEP_xy") ; ps,pdf,x11,ncgm,eps
> ; xwks = gsn_open_wks("x11","ISIMIP_MERRA_NCEP_xy")
>
> ; t = ut_calendar(t,1);change to the calendar year
> res = True ; plot mods desired
> ; res@gsnMaximize = True
> ; res@trXmaxF = max(m)
> res@tiMainString = "Precipitation ISIMIP/NCEP/MERRA" ; add title
> res@xyLineColors =(/"blue","red","green"/)
> res@xyLineThicknesses = (/3.0,3.0,4.0/)
> res@xyDashPattern = 0 ; Make curves all solid
> plot = gsn_csm_xy (pwks,m,data,res) ; create plot
> ; plot = gsn_csm_xy (xwks,m,data,res)
>
> ;*****************************************************
>
> ;set up resources for a customized legend.
> lgres = True
> lgres@lgLineColors = (/"blue","red","green"/)
> lgres@lgItemType = "Lines" ; show lines only (default)
> lgres@lgLabelFontHeightF = .08 ; legend label font thickness
> lgres@vpWidthF = 0.13 ; width of legend (NDC)
> lgres@vpHeightF = 0.10 ; height of legend (NDC)
> lgres@lgPerimThicknessF = 2.0 ; thicken the box perimeter
> lgres@lgMonoDashIndex = True
> lgres@lgDashIndex = 0
>
> labels = (/"ISIMIP","MERRA","NCEP"/)
> nitems = dimsizes(labels) ; number of legend items
> ; Create legend
> ; lbid = gsn_create_legend(xwks,nitems,labels,lgres)
> lbid = gsn_create_legend(pwks,nitems,labels,lgres)
> ; Use gsn_add_annotation to attach this legend to our existing plot.
> ; This way, if we resize the plot, the legend will stay with the
> ; plot and be resized automatically.
> ;
> amres = True
>
> ;
> ; Point (0,0) is the dead center of the plot. Point (0,.5) is center,
> ; flush bottom. Point (0.5,0.5) is flush bottom, flush right.
> ;
> amres@amJust = "BottomRight" ; Use bottom right corner of box
> ; for determining its location.
> amres@amParallelPosF = 0.5 ; Move legend to right
> amres@amOrthogonalPosF = 0.5 ; Move legend down.
>
> annoid = gsn_add_annotation(plot,lbid,amres) ; add legend to plot
>
> psres = True
> ; maximize_output(xwks,psres) ; calls draw and frame for you
> maximize_output(pwks,psres)
>
> There is no legend showing at all.
>
> Could someone here to help me figure out where is the problem?
>
> Thanks,
>
> Ping
>
>
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Received on Wed Oct 17 08:29:48 2012