Re: polygon problem. shading doesn't work right.

Alex,

I'm not quite sure what's going on with the plot, but you need to make sure when you draw a polygon, that it's a closed polygon. Otherwise, it won't fill correctly.

Please see example xy_10.ncl at:

http://www.ncl.ucar.edu/Applications/xy.shtml

You can actually run this example yourself if you get the "80.nc" data file from:

http://www.ncl.ucar.edu/Applications/Data/

I believe the xp and yp here are closed.

--Mary

On Apr 21, 2014, at 2:39 PM, Alexander Semenov <asemenov@alaska.edu> wrote:

> Hi ncl-talk,
>
> I have a time series of a value (AM_1), to which I want to add and deduct the standard deviation that will show its spread. I want to have a line plotted over the shaded spread. I tried modifying the code following the example (http://www.ncl.ucar.edu/Applications/Scripts/polyg_5.ncl), but I can't get it to work correctly. Could you please take a quick look and suggest the way to fix it?
>
> I have a one dimensional array with 61 values - called "AM_1"
>
> AM_1_st = dim_stddev_n_Wrap(AM_1,0) ; calculate the standard deviation of AM_1
> xp=new((/61/), float) ; set up the array for the polygon "AM_1 + stand. deviation"
> yp=new((/61/),float) ; set up the array for the polygon "AM_1 - stand. deviation"
>
> do xx= 0,60
> xp(xx)=AM_1(xx)+AM_1_st
> yp(xx)=AM_1(xx)-AM_1_st
> end do
>
> x=ispan(1948,2008,1)
>
> res@gsnDraw = False
> res@gsnFrame = False
> res@xyLineThicknessF = 2.
> res@tfPolyDrawOrder = "Predraw"
> plot(0) = gsn_csm_xy(wks,x,AM_1,res)
>
> gsres = True
> gsres@gsFillColor = "LightPink"
> dummy = gsn_add_polygon(wks,plot(0),x,xp,gsres) ; draw a polygon above the original array (array+stand deviation)
> dummy1 = gsn_add_polygon(wks,plot(0),x,yp,gsres) ; draw a polygon below the original array (array-stand deviation)
>
> I attached the plot of what happens when I compile my code. It looks to me that the polygons are drawn to the time series of "AM_1+st deviation" and not to the AM_1.
>
> regards,
> Alex
>
>
> <Screenshot.png>_______________________________________________
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Received on Mon Apr 21 20:51:51 2014