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132 lines
4.3 KiB
Plaintext
132 lines
4.3 KiB
Plaintext
; ***********************************************
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; viewport_4.ncl
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;
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; Concepts illustrated:
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; - Drawing an XY plot with multiple curves
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; - Using drawNDCGrid to draw a nicely labeled NDC grid
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; - Changing the size/shape of an XY plot using viewport resources
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; - Drawing two XY plots on the same page using viewport resources
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; - Drawing polylines, polymarkers, and text in NDC space
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; - Using "getvalues" to retrieve resource values
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; - Maximizing plots after they've been created
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; ***********************************************
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
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;********************************************************************
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; Draw a box around the viewport of the given object..
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;********************************************************************
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procedure draw_vp_box(wks,plot)
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local vpx, vpy, vpw, vph, xbox, ybox, lnres, mkres, txres
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begin
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; Retrieve the viewport values of the drawable object.
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getvalues plot
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"vpXF" : vpx
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"vpYF" : vpy
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"vpWidthF" : vpw
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"vpHeightF" : vph
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end getvalues
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; Set up some marker resources.
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mkres = True
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mkres@gsMarkerIndex = 16 ; filled dot
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mkres@gsMarkerSizeF = 0.02 ; larger than default
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mkres@gsMarkerColor = "Red"
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; Draw a single marker at the vpXF/vpYF location.
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gsn_polymarker_ndc(wks,vpx,vpy,mkres)
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; Set up some text resources.
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txres = True
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txres@txJust = "BottomLeft"
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txres@txFontHeightF = 0.018
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txres@txFontColor = "Blue"
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txres@txBackgroundFillColor = "white"
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gsn_text_ndc(wks,"(vpXF="+vpx+", vpYF="+vpy+")",vpx,vpy+0.02,txres)
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; Set up some line resources.
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lnres = True
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lnres@gsLineColor = "Red" ; line color
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lnres@gsLineThicknessF = 2.0 ; 3.5 times as thick
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; Draw lines indicating the width and height
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xline = (/vpx, vpx+vpw/)
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yline = (/vpy-0.05,vpy-0.05/)
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gsn_polyline_ndc(wks,xline,yline,lnres)
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xline = (/vpx+0.05,vpx+0.05/)
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yline = (/vpy,vpy-vph/)
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gsn_polyline_ndc(wks,xline,yline,lnres)
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txres@txJust = "CenterCenter"
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gsn_text_ndc(wks,"vpWidthF = " + vpw,vpx+vpw/2.,vpy-0.05,txres)
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txres@txAngleF = 90.
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gsn_text_ndc(wks,"vpHeightF = " + vph,vpx+0.05,vpy-vph/2.,txres)
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end
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;********************************************************************
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; Main code
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;********************************************************************
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begin
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;************************************************
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; read in data
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;************************************************
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f = addfile ("$NCARG_ROOT/lib/ncarg/data/cdf/uv300.nc","r")
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u = f->U ; get u data
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;************************************************
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; plotting parameters
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;************************************************
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wks = gsn_open_wks ("ps","viewport") ; open workstation
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res = True ; plot mods desired
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res@gsnFrame = False ; don't advance frame yet
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res@vpWidthF = 0.8 ; set width and height
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res@vpHeightF = 0.3
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; First plot
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res@tiMainString = "Plot 1"
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res@vpXF = 0.15
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res@vpYF = 0.9 ; Higher on the page
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plot1 = gsn_csm_xy (wks,u&lat,u(0,:,{82}),res) ; create plot
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; Second plot
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res@tiMainString = "Plot 2"
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res@vpXF = 0.15 ; Same X location as first plot
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res@vpYF = 0.4 ; Lower on the page
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plot2 = gsn_csm_xy (wks,u&lat,u(0,:,{3}),res) ; create plot
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; Advance the frame
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frame(wks)
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; Now draw the two plots with illustrations.
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drawNDCGrid(wks) ; Draw helpful grid lines showing NDC square.
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draw(plot1) ; Draw the two plots
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draw(plot2)
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draw_vp_box(wks,plot1) ; Draw boxes around the two viewports.
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draw_vp_box(wks,plot2)
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frame(wks) ; Advance the frame.
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;
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; Uncomment the next two lines if you want to maximize these plots for
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; PS or PDF output.
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;
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; psres = True
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; maximize_output(wks,psres) ; calls draw and frame for you
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end
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