Re: adding arrow and circle on figure

[Louis provided me with some more info offline].

Louis,

Thanks for sending your sample image.

If you simply want to draw a cirlce with four arrows and some text
around the circle outside the plot, I recommend using gsn_text_ndc.

You can use our various font tables to get the circles and arrows.

For example, font table 34 contains arrows, and font table 37
contains a hollow circle.

See the attach map.ncl sample file and PNG image.

--Mary

On Feb 8, 2010, at 10:26 AM, louis Vonder wrote:

> Hi NCL users,
>
> I am trying to add arrows and circle as shown in the attached figure.
> These vectors are used to depict diurnal cycle following clockwise.
> Unfortunately, I have some problem.
>
> Any help is appreciable.
>
> Here attached part of the script I used.
>
> Thanks
>
>
>
> wks = gsn_open_wks("eps",
> "panel_vector_mean_025_235K") ; open a ps file
> gsn_define_colormap(wks, "BlAqGrYeOrRevi200") ; choose color map
>
>
> plot = new(4, graphic) ; create a plot array
>
> res = True ; plot mods desired
> res@gsnDraw = False ; don't draw
> res@gsnFrame = False ; don't advance frame
>
>
> res@mpPerimOn = True
> res@mpFillOn = False ; turn off map fill
>
> res@mpDataBaseVersion = "Ncarg4_1" ; use finer
> database
> res@pmTickMarkDisplayMode = "Always" ; turn on
> tickmarks
> res@mpGeophysicalLineThicknessF = 2.5 ; thickness of
> outlines
> res@mpNationalLineThicknessF = 2.5
> res@mpOutlineBoundarySets = "National" ; turn on
> country boundaries
> res@gsnAddCyclic = False ; regional
> data, don't add pt
>
>
>
> res@mpMinLonF = min(lon) ; select a
> subregion
> res@mpMaxLonF = max(lon)
> res@mpMinLatF = min(lat)
> res@mpMaxLatF = max(lat)
>
>
>
> res@cnFillOn = True ; turn on color for
> contours
> res@cnLinesOn = False ; turn off contour
> lines
> res@cnLineLabelsOn = False ; turn off contour
> line labels
> res@gsnScalarContour = True ; contours desired
> res@gsnSpreadColors = True ; use full color map
> res@gsnSpreadColorStart = 25 ; start at color 17
> res@gsnSpreadColorEnd = 180 ; end at color 200
>
> res@lbLabelBarOn = False
> res@lbOrientation = "vertical" ; vertical label bar
> res@pmLabelBarOrthogonalPosF = -0.01 ; move label bar
> closer
> ; res@lbLabelStride = 4
>
> res@pmLabelBarOrthogonalPosF = 0.01
> res@pmLabelBarOrthogonalPosF = -0.05
> res@pmLabelBarOrthogonalPosF = 0.05
>
>
>
> res@cnLevelSelectionMode = "ManualLevels" ; set manual
> contour levels
> res@cnMinLevelValF = 2 ; set min
> contour level
> res@cnMaxLevelValF = 24 ; set max
> contour level
> res@cnLevelSpacingF = 2 ; contour
> spacing
> res@vcRefAnnoOrthogonalPosF = -1.0 ; move ref vector up
> res@vcRefMagnitudeF = 20.0 ; define vector
> ref mag
> res@vcRefLengthF = 0.035 ; define length of
> vec ref
> ; res@vcGlyphStyle = "CurlyVector" ; turn on curly
> vectors
> res@vcMinDistanceF = 0.015
> res@gsnAddCyclic = False
>
>
> res@gsnLeftString = "b)" ; add the gsn titles
> res@gsnCenterString = " "
> res@gsnRightString = "JJA"
> res@gsnStringFont = " " ; set gsnLeft/Center/
> RightString font
> ; to helvetica-bold from
> default.
>
> res@gsnLeftStringFontHeightF = 0.025 ; instead of using
> txFontHeightF or gsnStringFontHeightF
> res@gsnCenterStringFontHeightF = 0.00 ; to set the
> gsnLeft/Center/RightString font heights,
> res@gsnRightStringFontHeightF = 0.025 ; individually set
> each string's font height.
>
> res@vpXF = 0.1
> res@vpWidthF = 0.725
> res@vpYF = 0.9
> res@vpHeightF = 0.8
>
> res@tmXBLabelFontHeightF = 0.02
> res@tmBorderThicknessF = 3.0
>
> res@vpXF = 0.2
> res@vpWidthF = 0.6
> res@vpYF = 0.83
> res@vpHeightF = 0.465
>
> res@gsnRightString = " "
>
> res@gsnLeftString = " "
>
> res@vcRefAnnoOn = False
>
> plot(0) = gsn_csm_vector_scalar_map_ce(wks, u1, v1, fc1, res)
>
> plot(1) = gsn_csm_vector_scalar_map_ce(wks, u2, v2, fc2, res)
>
> plot(2) = gsn_csm_vector_scalar_map_ce(wks, u3, v3, fc3, res)
>
> res@vcRefAnnoOn = True
>
> plot(3) = gsn_csm_vector_scalar_map_ce(wks, u4, v4, fc4, res)
>
>
> ;************************************************
> ; create panel
> ;************************************************
> resP = True ; modify the panel
> plot
> resP@gsnFrame = False ; don't advance
> panel plot
> resP@gsnPanelLabelBar = True ; add common colorbar
> resP@gsnMaximize = True
> resP@lbOrientation = "vertical"
> resP@lbLabelFontHeightF = 0.015
> resPgsnPanelYWhiteSpacePercent = 5
> resP@cnFillOn = True ; turn on color
>
> resP@txString = " "
> resP@tiXAxisString = " "
> resP@tiYAxisString = " "
>
> resP@gsnPanelBottom = 0.05 ; add space
> at bottom
> resP@gsnPanelFigureStrings = (/"DJF", "MAM", "JJA", "SON"/) ;
> add strings to panel
> resP@amJust = "TopLeft"
> resP@gsnPanelFigureStringsFontHeightF = 0.015
> resP@gsnPanelFigureStringsPerimOn = False
>
> gsn_panel(wks, plot, (/2, 2/), resP) ; now draw as
> one plot
> resP@vpXF = 0.095
> resP@vpYF = 0.85
> resP@vpHeightF = 0.9 ; Make this second map smaller.
> resP@vpWidthF = 0.9
>
> xtres = True
> xtres@txFontHeightF = 0.025
> xtres@txAngleF = 0.
> xtres@txFontColor = "red"
>
> xtres@txFontHeightF = 0.025
>
> gsn_text_ndc(wks, "a)", .305, .85, xtres)
> gsn_text_ndc(wks, "b)", .75, .85, xtres)
>
> gsn_text_ndc(wks, "c)", .305, .47, xtres)
> gsn_text_ndc(wks, "d)", .75, .47, xtres)
>
> frame(wks)
>
>
> <image.jpg>
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Received on Wed Feb 10 15:42:06 2010