/usr/share/ncarg/hluex/streamlineplot/st03f.f is in libncarg-data 6.4.0-9.
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C $Id: st03f.f,v 1.7 2010-03-15 22:49:24 haley Exp $
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C C
C Copyright (C) 1996 C
C University Corporation for Atmospheric Research C
C All Rights Reserved C
C C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
C File: st03f.f
C
C Author: David Brown (converted by Mary Haley)
C National Center for Atmospheric Research
C PO 3000, Boulder, Colorado
C
C Date: Thu June 27 9:11:01 MST 1996
C
C Description:
C This plot shows a StreamlinePlot overlaid on a polar
C stereographic map projection. It illustrates some of
C the problems with streamlines when the transformation to
C NDC results in grid cells that vary widely in size.
C Adjustment of certain parameters may improve the
C appearance somewhat, but not as much as might be
C desired. For this and other reasons, StreamlinePlot is
C still undergoing development and its output may be
C expected to change in the next release.
C The data is extracted from an NMC forecast dataset for
C 11/10/1994.
C
external NhlFAppClass
external NhlFNcgmWorkstationClass
external NhlFPSWorkstationClass
external NhlFPDFWorkstationClass
external NhlFCairoPSPDFWorkstationClass
external NhlFCairoImageWorkstationClass
external NhlFCairoWindowWorkstationClass
external NhlFVectorFieldClass
external NhlFStreamlinePlotClass
external NhlFMapPlotClass
parameter(M=73,N=73)
character*7 wks_type
integer appid, wid, dataid, stid, mpid
integer ncid, uid, vid, latid, lonid
integer rlist, grlist
integer len_dims(2)
real U(M,N),V(M,N)
real stepsize,spacing
integer start(2), count(2), lonlen, latlen
character*256 filename
character*50 recname
integer flen
C
C Define the workstation type
C
wks_type = "x11"
C
C Initialize the high level utility library
C
call NhlFInitialize
C
C Create an application context. Set the app dir to the current
C directory so the application looks for a resource file in the working
C directory.
C
call NhlFRLCreate(rlist,'setrl')
call NhlFRLCreate(grlist,'getrl')
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'appUsrDir','./',ierr)
call NhlFCreate(appid,'st03',NhlFappClass,0,rlist,ierr)
if (wks_type.eq."ncgm".or.wks_type.eq."NCGM") then
C
C Create an NCGM workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkMetaName','./st03f.ncgm',ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFNcgmWorkstationClass,0,rlist,ierr)
else if (wks_type.eq."x11".or.wks_type.eq."X11") then
C
C Create an X11 workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPause','True',ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFCairoWindowWorkstationClass,
+ 0,rlist,ierr)
else if (wks_type.eq."oldps".or.wks_type.eq."OLDPS") then
C
C Create an older-style PostScript workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPSFileName','./st03f.ps',ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFPSWorkstationClass,0,rlist,ierr)
else if (wks_type.eq."oldpdf".or.wks_type.eq."OLDPDF") then
C
C Create an older-style PDF workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkPDFFileName','./st03f.pdf',ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFPDFWorkstationClass,0,rlist,ierr)
else if (wks_type.eq."pdf".or.wks_type.eq."PDF".or.
+ wks_type.eq."ps".or.wks_type.eq."PS") then
C
C Create a cairo PS/PDF workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFileName','./st03f',ierr)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFCairoPSPDFWorkstationClass,0,rlist,ierr)
else if (wks_type.eq."png".or.wks_type.eq."PNG") then
C
C Create a cairo PNG workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFileName','./st03f',ierr)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFCreate(wid,'st03Work',
+ NhlFCairoImageWorkstationClass,0,rlist,ierr)
endif
C
C Open the netCDF file.
C
call gngpat(filename,'data',ierr)
flen = 17
do 10 i=1,256
if( filename(i:i).eq.char(0) ) then
filename(i:i+flen)='/cdf/941110_UV.cdf'
goto 15
endif
10 continue
C
C The second argument to 'ncopn' should be NCNOWRIT, but since we
C can't include 'netcdf.inc', we are using the value '0' instead.
C
15 ncid = ncopn(filename,0,ierr)
C
C Get the data.
C
latid = ncdid(ncid,'lat',ierr)
lonid = ncdid(ncid,'lon',ierr)
uid = ncvid(ncid,'u',ierr)
vid = ncvid(ncid,'v',ierr)
call ncdinq(ncid,latid,recname,latlen,ierr)
call ncdinq(ncid,lonid,recname,lonlen,ierr)
start(1) = 1
start(2) = 1
count(1) = lonlen
count(2) = latlen
call ncvgt(ncid,uid,start,count,U,ierr)
call ncvgt(ncid,vid,start,count,V,ierr)
C
C Create a VectorField data object using the data set defined above.
C By default the array bounds will define the data boundaries (zero-based,
C as in C language conventions)
C
len_dims(1) = lonlen
len_dims(2) = latlen
call NhlFRLClear(rlist)
call NhlFRLSetMDFloatArray(rlist,'vfUDataArray',U,2,len_dims,ierr)
call NhlFRLSetMDFloatArray(rlist,'vfVDataArray',V,2,len_dims,ierr)
call NhlFRLSetFloat(rlist,'vfXCStartV', -180.0,ierr)
call NhlFRLSetFloat(rlist,'vfXCEndV', 180.0,ierr)
call NhlFRLSetFloat(rlist,'vfYCStartV', -90.0,ierr)
call NhlFRLSetFloat(rlist,'vfYCEndV', 90.0,ierr)
call NhlFRLSetFloat(rlist,'vfYCStartSubsetV', 0.0,ierr)
call NhlFRLSetFloat(rlist,'vfYCEndSubsetV', 87.5,ierr)
call NhlFCreate(dataid,'vfield',NhlFvectorFieldClass,appid,rlist,
+ ierr)
C
C Create a StreamlinePlot object, supplying the VectorField object as data
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
+ 'StreamlinePlot Overlaying MapPlot',ierr)
call NhlFRLSetInteger(rlist,'stVectorFieldData',dataid,ierr)
call NhlFCreate(stid,'streamlineplot',NhlFstreamlinePlotClass,wid,
+ rlist,ierr)
call NhlFCreate(mpid,'mapplot',NhlFmapPlotClass,wid,0,ierr)
call NhlFAddOverlay(mpid,stid,-1,ierr)
call NhlFDraw(mpid,ierr)
call NhlFFrame(wid,ierr)
call NhlFRLClear(grlist)
call NhlFRLGetFloat(grlist,'stStepSizeF',stepsize,ierr)
call NhlFRLGetFloat(grlist,'stMinLineSpacingF',spacing,ierr)
call NhlFGetValues(stid,grlist,ierr)
C
C Set the minimum arrow spacing
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
+ 'Setting the Minimum Arrow Spacing',ierr)
call NhlFRLSetFloat(rlist,'stMinArrowSpacingF',0.025,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(mpid,ierr)
call NhlFFrame(wid,ierr)
C
C Set the minimum line spacing
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString','Smaller Line Spacing',
+ ierr)
call NhlFRLSetFloat(rlist,'stMinLineSpacingF',spacing * 0.5,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(mpid,ierr)
call NhlFFrame(wid,ierr)
C
C Set the step size
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString','Smaller Step Size',
+ ierr)
call NhlFRLSetFloat(rlist,'stStepSizeF',stepsize * 0.5,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(mpid,ierr)
call NhlFFrame(wid,ierr)
C
C Clean up
C
call NhlFDestroy(appid,ierr)
call NhlFClose
stop
end
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