[ncl-talk] Issue with cnFillOpacityF in NCL 6.4.0

[Tanya Peevey]

NCL Help,

I found a strange behavior with the new cnFillOpacityF resource in NCL
6.4.0. This is a great resource, however, it does the below.

The online information (
https://www.ncl.ucar.edu/Applications/rgbacolor.shtml) says that
cnFillOpacityF changes the opacity of all filled contours. When I use this
resource by setting it to say, 0.8 for example, my polymarkers are also
affected. This is unexpected since there is a separate resource for this,
gsMarkerOpacityF. Am I missing something here? Am I setting my polymarker
resource incorrectly. I'm going to work around this for now (by setting
cnFillOpacityF back to 1.0 before adding the polymarkers), but here is a
snippet of my code in case there is a solution to this that I'm missing.

**********************************************************************************************************

wks3 = gsn_open_wks("pdf",OUT_DIR + PLOT3_FILE)

gsn_define_colormap(wks3,"nrl_sirkes")

gsn_reverse_colormap(wks3)

cnlev3 = ispan(-40,40,4)  ; for m/s


res1 = True

res1 at gsnLeftString = " "

res1 at gsnCenterString = DATE_START + ", FHR " + FHR(istep)

res1 at gsnRightString = " "

res1 at mpFillOn = True

res1 at mpOutlineBoundarySets       = "National"

res1 at mpOutlineBoundarySets       = "USStates"

res1 at mpGeophysicalLineColor      = "gray35"

res1 at mpGeophysicalLineThicknessF = 2

res1 at mpLimitMode="LatLon"

res1 at mpMinLatF = LAT_RANGE(0)

res1 at mpMaxLatF = LAT_RANGE(1)                ;

res1 at mpMinLonF = LON_RANGE(0)                ;

res1 at mpMaxLonF = LON_RANGE(1)                ;

res1 at mpCenterLonF= LON_RANGE(2)

res1 at mpOutlineOn = True

res1 at gsnDraw      = False

res1 at gsnFrame     = False

res1 at gsnMaximize  = True

res1 at gsnPaperOrientation = "portrait"

res1 at cnLevelSelectionMode = "ExplicitLevels"

res1 at cnLineLabelsOn = False

res1 at cnFillOn        = True

res1 at cnLinesOn       = False

res1 at gsnSpreadColors = True

res1 at tiMainFontHeightF = 0.02

res2 = True

res2 at gsnLeftString = " "

res2 at gsnRightString = " "

res2 at gsnDraw         = False

res2 at gsnFrame        = False

res2 at cnLevelSelectionMode = "ExplicitLevels" ; use explicit levels

res2 at cnLineLabelPlacementMode = "constant"

res2 at cnFillOn        = False

res2 at cnLineThicknessF = 1.5

mres               = True                     ; marker mods desired

mres at gsMarkerIndex = 1                       ; polymarker style

mres at gsMarkerSizeF = 50.0                      ; polymarker size

mres at gsMarkerColor = "black"                    ; polymarker color

;------------------------------------------------------------------

;  Plots: Vertical Velocity and Cloud Ice Water Content

;------------------------------------------------------------------


res1 at cnLevels = cnlev3

res1 at cnFillOpacityF = 0.8

res1 at tiMainString = PLOT3_TITLE

res2 at cnLevelSelectionMode = "AutomaticLevels"


plot_filled = gsn_csm_contour_map(wks3,FLD7({P_LEVS(ilev)},:,:),res1)

plot_lineNR = gsn_csm_contour(wks3,FLD5({P_LEVS(ilev)},:,:),res2)


overlay(plot_filled,plot_lineNR)


dum := new(2,graphic)


dum(0) =
gsn_add_polymarker(wks3,plot_filled,track_lon(0:istep),track_lat(0:istep),mres)


mres at gsMarkerIndex = 3                       ; polymarker style

mres at gsMarkerSizeF = 2.0                      ; polymarker size

dum(1) = gsn_add_polymarker(wks3,plot_filled,lon_cloud,lat_cloud,mres)


draw(plot_filled)

frame(wks3)

delete(wks3)

delete([/res1 at cnLevels/])


**********************************************************************************************************

Thank you,
Tanya Peevey
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180627/32b99cc3/attachment.html>