load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

begin

; for use of high resolution map database, execute
; 'setenv NCARG_RANGS /network/rit/lab/atm419lab/zhou/rangs' (on snow)
; 'setenv NCARG_RANGS /atm419lab/zhou/rangs' (on ash, reed)
; before running the script

c="./cmap_shear.txt"
cmap=asciiread(c,(/103,3/),"float")
cmap=cmap/255

data=addfile("./shear_composite.nc","r")
U=data->U
V=data->V

;printVarSummary(U)

U!0="case"
V!0="case"

;printVarSummary(U)

U&lat=fspan(-20,20,161)
U&lon=fspan(-20,20,161)
V&lat=fspan(-20,20,161)
V&lon=fspan(-20,20,161)

dsizes=dimsizes(U)
;print(dsizes)
dcase=dsizes(0)
dlat=dsizes(1)
dlon=dsizes(2)

nEOF=3
optEOF=True
optEOF@jopt=0 ;covariance
U_EOF=eofunc_n_Wrap(U,nEOF,optEOF,0)
pcvar_U=U_EOF@pcvar
V_EOF=eofunc_n_Wrap(V,nEOF,optEOF,0)
pcvar_V=V_EOF@pcvar

U_REOF=eofunc_varimax_Wrap(U_EOF,1)
pcvarr_U=U_REOF@pcvar_varimax
var_U=U_REOF@variance_varimax

V_REOF=eofunc_varimax_Wrap(V_EOF,1)
pcvarr_V=V_REOF@pcvar_varimax
var_V=V_REOF@variance_varimax

printVarSummary(U_EOF)
printVarSummary(U_REOF)
print(pcvar_U)
print(pcvarr_U)
print(var_U)

printVarSummary(V_EOF)
printVarSummary(V_REOF)
print(pcvar_V)
print(pcvarr_V)
print(var_V)

MAG_EOF=sqrt(U_EOF^2+V_EOF^2)
copy_VarMeta(U_EOF,MAG_EOF)

MAG_REOF=sqrt(U_REOF^2+V_REOF^2)
copy_VarMeta(U_REOF,MAG_REOF)

;printVarSummary(MAG_EOF)
;print(MAG_EOF@pcvar)

V_EOF(1,:,:)=-V_EOF(1,:,:)
U_EOF(1,:,:)=-U_EOF(1,:,:)

V_REOF(1,:,:)=V_REOF(1,:,:)
U_REOF(1,:,:)=-U_REOF(1,:,:)

V_REOF(2,:,:)=-V_REOF(2,:,:)
U_REOF(2,:,:)=-U_REOF(2,:,:)

do n=0,nEOF-1,1

print("EOF "+(n+1)+" U range: "+min(U_EOF(n,:,:))+" "+max(U_EOF(n,:,:)))
print("EOF "+(n+1)+" V range: "+min(V_EOF(n,:,:))+" "+max(V_EOF(n,:,:)))
print("EOF "+(n+1)+" MAG range: "+min(MAG_EOF(n,:,:))+" "+max(MAG_EOF(n,:,:)))

wks=gsn_open_wks("png","shear_eof_"+(n+1))
gsn_define_colormap(wks,cmap)

res=True

res@gsnAddCyclic=False
res@gsnFrame=False
res@gsnDraw=False
res@gsnMaximize=False
res@gsnStringFont=21
res@gsnLeftString="200-850hPa shear"
res@gsnLeftStringOrthogonalPosF=0.01
res@gsnLeftStringFontHeightF=0.015
res@gsnRightString="EOF "+(n+1)+" U "+sprintf("%3.1f",pcvarr_U(n))+"%"+\
                                " V "+sprintf("%3.1f",pcvarr_V(n))+"%"
;res@gsnRightString="composite of 92 cases"
;res@gsnRightString="+"+sprinti("%0.2i",counter)+"h"
;res@gsnRightString="+"+sprintf("%4.1f",counter*0.5)+"h"
res@gsnRightStringOrthogonalPosF=0.01
res@gsnRightStringFontHeightF=0.015
res@gsnScalarContour=True

res@vpXF=0.15
res@vpYF=0.95
res@vpHeightF=0.7
res@vpWidthF=0.7

res@trYMinF=-20
res@trYMaxF=20
res@trXMinF=-20
res@trXMaxF=20

res@vcRefMagnitudeF=0.03
res@vcRefLengthF=0.03
res@vcGlyphStyle="CurlyVector"
res@vcLineArrowThicknessF=3.0
res@vcRefAnnoOrthogonalPosF=-0.089
res@vcRefAnnoParallelPosF=1.0
res@vcMinDistanceF=0.03
res@vcMonoLineArrowColor=True
res@vcLineArrowColor="white"
res@vcLineArrowHeadMaxSizeF=0.008
res@vcRefAnnoArrowUseVecColor=False
res@vcRefAnnoArrowLineColor=1

res@vcRefAnnoString2On=False

;res@stLineColor=0
;res@stArrowLengthF=0.004
;res@stMinArrowSpacingF=0.004
;res@stMinDistanceF=0.1
;res@stLineThicknessF=2.0
;res@stStepSizeF=0.01

res@cnFillOn=True
res@cnLevelSelectionMode="ExplicitLevels"
res@cnLevels:=fspan(0,0.03,61)
res@cnFillOpacityF=1
res@cnLinesOn=False

res@lbBoxSeparatorLinesOn=False
res@lbLabelStride=10

res@pmLabelBarHeightF=0.1

;res@mpDataResolution="FinestResolution"
;res@mpDataBaseVersion="HighRes"
;res@mpLimitMode="LatLon"
;;res@mpCenterLatF=centlat
;;res@mpCenterLonF=centlon
;res@mpMinLatF=centlat-20
;res@mpMaxLatF=centlat+20
;res@mpMinLonF=centlon-20
;res@mpMaxLonF=centlon+20
;res@mpMonoFillColor=False
;res@mpFillColors=(/-1,-1,-1/)
;res@mpOutlineOn=True

res@tmXTOn                = False
res@tmYROn                = False

res@tmXBMode              = "Explicit"
res@tmXBValues            = ispan(-15,15,5)
res@tmXBLabels            = res@tmXBValues
;res@tmXBLabels            = (/"100~S~o~N~E","110~S~o~N~","120~S~o~N~E",\
;                              "130~S~o~N~","140~S~o~N~E","150~S~o~N~",\
;                              "160~S~o~N~E","170~S~o~N~","180~S~o~N~E"/)
res@tmXBMajorLengthF      = 0.01
res@tmXBMajorOutwardLengthF=0.0
res@tmXBMajorThicknessF   = 3.0
res@tmXBMinorOn           = False
res@tmXBMinorPerMajor     = 4
res@tmXBMinorLengthF      = 0.004
res@tmXBMinorOutwardLengthF=0.0
res@tmXBMinorThicknessF   = 2.0
res@tmXBLabelFont         = 21
res@tmXBLabelFontHeightF  = 0.015
res@tmXBLabelDeltaF       = -0.6

res@tmYLMode              = "Explicit"
res@tmYLValues            = ispan(-15,15,5)
res@tmYLLabels            = res@tmYLValues
;res@tmYLLabels            = (/"0~S~o~N~","10~S~o~N~N","20~S~o~N~",\
;                              "30~S~o~N~N","40~S~o~N~","50~S~o~N~N"/)
res@tmYLMajorLengthF      = 0.01
res@tmYLMajorOutwardLengthF=0.0
res@tmYLMajorThicknessF   = 3.0
res@tmYLMinorOn           = False
res@tmYLMinorPerMajor     = 4
res@tmYLMinorLengthF      = 0.004
res@tmYLMinorOutwardLengthF=0.0
res@tmYLMinorThicknessF   = 2.0
res@tmYLLabelFont         = 21
res@tmYLLabelFontHeightF  = 0.015
res@tmYLLabelDeltaF       = -0.3

plot1=gsn_csm_contour(wks,MAG_REOF(n,:,:),res)

plot2=gsn_csm_vector(wks,U_REOF(n,:,:),V_REOF(n,:,:),res)

resc=True
resc@gsLineColor="cyan" ;RGB for "cyan" is (0 255 255)
resc@gsLineThicknessF=10
resc@gsLineDashPattern=2
resc@gsLineDashSegLenF=0.3
circle_ll(wks,plot1,0,0,5,resc)

draw(plot1)
draw(plot2)

frame(wks)

end do

end