[ncl-talk] circular polymarker woes
Mary Haley
haley at ucar.edu
Mon Jul 31 15:59:11 MDT 2017
Hi Matt,
Instead of using index 4 in the marker table, you can create your own
marker using any one of our font tables. Some of these were drawn with
higher resolution.
For example, click over to our font tables page:
http://www.ncl.ucar.edu/Document/Graphics/font_tables.shtml
and click on font table 37:
http://www.ncl.ucar.edu/Document/Graphics/Images/font37.png
Letter R is a hollow circle that might work for you.
To use it, call:
icirc = NhlNewMarker(wks,"R",37,0.,0.,1.,1.,0.)
and then use that as your marker index:
gsres at gsMarkerIndex = icirc
See the attached script, which displays the two types of circles
side-by-side.
Font table 19 also has some hollow circles you can try.
--Mary
On Mon, Jul 31, 2017 at 9:56 AM, Matt Flournoy <mflournoy37 at gmail.com>
wrote:
> Hi all,
>
> I'm having a minor problem plotting a circular polymarker. I'm using
> index=4 for the marker index, which should be a hollow circle, but when I
> plot it larger than ~ 0.03 the shape starts to deteriorate into a 16-sided
> polygon. Is there a way to ensure that the circular marker retains its
> shape when it is plotted larger than normal? I've attached a .png of the
> figure I'm trying to create, and here is the snippet of code that deals
> with the portion of the plot that I'm having problems with:
>
> *******************
>
> ;-------
> ; Create the index for the hollow, circle marker.
> ;-------
>
> ; mstring = "x" ; <-- default for hollow circle
> ; fontnum = 19
> ; xoffset = 0.0
> ; yoffset = 0.075
> ; ratio = 1.3125
> ; size = 1.2
> ; angle = 0.0
> ;
> ; new_index = NhlNewMarker(xwks, mstring, fontnum, xoffset, yoffset,
> ratio, size, angle)
>
> cn1_x = 0.84
> cn1_y = 0.20
>
> text_cn1 = "0.01"
>
> cn_res1 = True
> cn_res1 at gsMarkerColor = cn_color
> cn_res1 at gsLineColor = cn_color
> cn_res1 at gsMarkerIndex = 4 ; <-- open circle
> cn_res1 at gsMarkerSizeF = 0.10
> cn_res1 at gsLineThicknessF = 3
> cn_res1 at gsMarkerThicknessF = 3
> cn_res1 at gsFontQuality = "High"
>
> cn_res1_text = True
> cn_res1_text at txFontHeightF = 0.008
> cn_res1_text at txFontColor = cn_color
> cn_res1_text at txBackgroundFillColor = "white"
>
> gsn_polymarker_ndc(xwks,cn1_x,cn1_y,cn_res1)
> gsn_text_ndc (xwks,text_cn1,cn1_x + (cn_res1 at gsMarkerSizeF/2),cn1_
> y,cn_res1_text)
>
> ;-------
>
> offset = 0.03
>
> cn2_x = cn1_x - offset + 0.02
> cn2_y = cn1_y
>
> text_cn2 = "0.02"
>
> cn_res2 = True
> cn_res2 at gsMarkerColor = cn_color
> cn_res2 at gsLineColor = cn_color
> cn_res2 at gsMarkerIndex = 4 ; <-- open circle
> cn_res2 at gsMarkerSizeF = cn_res1 at gsMarkerSizeF - offset
> cn_res2 at gsLineThicknessF = 3
> cn_res2 at gsMarkerThicknessF = 3
> cn_res2 at gsFontQuality = "High"
>
> cn_res2_text = True
> cn_res2_text at txFontHeightF = cn_res1_text at txFontHeightF
> cn_res2_text at txFontColor = cn_color
> cn_res2_text at txBackgroundFillColor = "white"
>
> gsn_polymarker_ndc(xwks,cn2_x,cn2_y,cn_res2)
> gsn_text_ndc (xwks,text_cn2,cn2_x + (cn_res2 at gsMarkerSizeF/2),cn2_
> y,cn_res2_text)
>
> ;-------
>
> cn3_x = cn2_x - offset + 0.02
> cn3_y = cn2_y
>
> text_cn3 = "0.03"
>
> cn_res3 = True
> cn_res3 at gsMarkerColor = cn_color
> cn_res3 at gsLineColor = cn_color
> cn_res3 at gsMarkerIndex = 4 ; <-- open circle
> cn_res3 at gsMarkerSizeF = cn_res2 at gsMarkerSizeF - offset
> cn_res3 at gsLineThicknessF = 3
> cn_res3 at gsMarkerThicknessF = 3
> cn_res3 at gsFontQuality = "High"
>
> cn_res3_text = True
> cn_res3_text at txFontHeightF = cn_res1_text at txFontHeightF
> cn_res3_text at txFontColor = cn_color
> cn_res3_text at txBackgroundFillColor = "white"
>
> gsn_polymarker_ndc(xwks,cn3_x,cn3_y,cn_res3)
> gsn_text_ndc (xwks,text_cn3,cn3_x + (cn_res3 at gsMarkerSizeF/2),cn3_
> y,cn_res3_text)
>
> ;------- and lastly, the units text inside the circles...
>
> cn4_x = 0.815
> cn4_y = cn3_y
>
> text_cn4 = "s~S~-1~N~"
>
> cn_res4_text = True
> cn_res4_text at txFontHeightF = cn_res1_text at txFontHeightF
> cn_res4_text at txFontColor = cn_color
> cn_res4_text at txBackgroundFillColor = -1 ; <-- transparent
>
> gsn_text_ndc (xwks,text_cn4,cn4_x,cn4_y,cn_res4_text)
>
> *******************
>
> Please let me know if I can provide any more info to help with this.
>
> Thanks,
> Matt
>
> [image: Inline image 2]
> --
> Matthew Flournoy
> M.S. Meteorology, University of Oklahoma
> B.S. Meteorology, Penn State University
>
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