/usr/share/ncarg/hluex/streamlineplot/st02f.f is in libncarg-data 6.4.0-9.
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C $Id: st02f.f,v 1.6 2010-03-15 22:49:24 haley Exp $
C
C***********************************************************************
C *
C Copyright (C) 1993 *
C University Corporation for Atmospheric Research *
C All Rights Reserved *
C *
C***********************************************************************
C
C File: st02f.f
C
C Author: David Brown
C National Center for Atmospheric Research
C PO 3000, Boulder, Colorado
C
C Date: Wed Apr 3 17:00:55 MST 1996
C
C Description: Given a simple mathematically generated data set,
C demonstrates line-drawn streamline arrows and the use
C of some basic StreamlinePlot resources
C
external NhlFAppClass
external NhlFNcgmWorkstationClass
external NhlFPSWorkstationClass
external NhlFPDFWorkstationClass
external NhlFCairoPSPDFWorkstationClass
external NhlFCairoImageWorkstationClass
external NhlFCairoWindowWorkstationClass
external NhlFVectorFieldClass
external NhlFStreamlinePlotClass
parameter(N=30,M=25)
parameter(PI=3.14159)
character*7 wks_type
integer appid,wid,stid,vfid
integer rlist,grlist
integer len_dims(2)
real U(M,N),V(M,N)
real igrid, jgrid
real stepsize,arrowlength,spacing
integer i,j
C
C Define the workstation type
C
wks_type = "x11"
C
C Generate vector data arrays
C
igrid = 2.0 * PI / real(M)
jgrid = 2.0 * PI / real(N)
do 20 j = 1,N
do 10 i=1,M
U(i,j) = 10.0 * cos(jgrid * real(j-1))
V(i,j) = 10.0 * cos(igrid * real(i-1))
10 continue
20 continue
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,'st02',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','./st02f.ncgm',ierr)
call NhlFCreate(wid,'st02Work',NhlFNcgmWorkstationClass,
1 0,rlist,ierr)
else if (wks_type.eq."x11".or.wks_type.eq."X11") then
C
C Create an X workstation.
C
call NhlFRLClear(rlist)
call NhlFRLSetstring(rlist,'wkPause','True',ierr)
call NhlFCreate(wid,'st02Work',
1 NhlFCairoWindowWorkstationClass,
1 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','./st02f.ps',ierr)
call NhlFCreate(wid,'st02Work',NhlFPSWorkstationClass,
1 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','./st02f.pdf',ierr)
call NhlFCreate(wid,'st02Work',NhlFPDFWorkstationClass,
1 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 object.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFRLSetstring(rlist,'wkFileName','./st02f',ierr)
call NhlFCreate(wid,'st02Work',
1 NhlFCairoPSPDFWorkstationClass,0,rlist,ierr)
else if (wks_type.eq."png".or.wks_type.eq."PNG") then
C
C Create a cairo PNG object.
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'wkFormat',wks_type,ierr)
call NhlFRLSetstring(rlist,'wkFileName','./st02f',ierr)
call NhlFCreate(wid,'st02Work',
1 NhlFCairoImageWorkstationClass,0,rlist,ierr)
endif
C
C Create a VectorField data object using the data set defined above.
C By default the array bounds will define the data boundaries
C (zero-based, as in C language conventions)
C
len_dims(1) = M
len_dims(2) = N
call NhlFRLClear(rlist)
call NhlFRLSetMDFloatArray(rlist,'vfUDataArray',U,2,len_dims,ierr)
call NhlFRLSetMDFloatArray(rlist,'vfVDataArray',V,2,len_dims,ierr)
call NhlFCreate(vfid,'vectorfield',NhlFVectorFieldClass,appid,
1 rlist,ierr)
C
C Create a StreamlinePlot object, supplying the VectorField object as data
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
1 'Modifying StreamlinePlot resources',ierr)
call NhlFRLSetInteger(rlist,'stVectorFieldData',vfid,ierr)
call NhlFCreate(stid,'streamlineplot',NhlFStreamlinePlotClass,wid,
1 rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Get the values of several resources that are set dynamically based
C on the assumed NDC size of a grid cell. Each of this will be separately
C modified in the course of this example to illustrate their effect.
C
call NhlFRLClear(grlist)
call NhlFRLGetFloat(grlist,'stStepSizeF',stepsize,ierr)
call NhlFRLGetFloat(grlist,'stArrowLengthF',arrowlength,ierr)
call NhlFRLGetFloat(grlist,'stMinLineSpacingF',spacing,ierr)
call NhlFGetValues(stid,grlist,ierr)
C
C Increase the step size
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString','Larger Step Size',ierr)
call NhlFRLSetFloat(rlist,'stStepSizeF',stepsize * 4.0,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Decrease the step size
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString','Smaller Step Size',
1 ierr)
call NhlFRLSetFloat(rlist,'stStepSizeF',stepsize * 0.25,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Increase the minimum line spacing
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
1 'Larger Minimum Line Spacing',ierr)
call NhlFRLSetFloat(rlist,'stStepSizeF',stepsize,ierr)
call NhlFRLSetFloat(rlist,'stMinLineSpacingF', spacing * 4.0,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Decrease the minimum line spacing
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
1 'Smaller Minimum Line Spacing',ierr)
call NhlFRLSetFloat(rlist,'stMinLineSpacingF',spacing * 0.25,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Increase the line starting grid stride
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
1 'Larger Line Starting Grid Stride',ierr)
call NhlFRLSetFloat(rlist,'stMinLineSpacingF',spacing,ierr)
call NhlFRLSetInteger(rlist,'stLineStartStride',3,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Decrease the line starting grid stride
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString',
1 'Smaller Line Starting Grid Stride',ierr)
call NhlFRLSetInteger(rlist,'stLineStartStride',1,ierr)
call NhlFSetValues(stid,rlist,ierr)
call NhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Increase the arrow size
C
call NhlFRLClear(rlist)
call NhlFRLSetString(rlist,'tiMainString','Larger Arrows',ierr)
call NhlFRLSetInteger(rlist,'stLineStartStride',2,ierr)
call NhlFRLSetFloat(rlist,'stArrowLengthF',arrowlength*2.0,ierr)
call NhlFSetValues(stid,rlist,ierr)
callNhlFDraw(stid,ierr)
call NhlFFrame(wid,ierr)
C
C Destroy the objects created, close the HLU library and exit.
C
call NhlFDestroy(appid,ierr)
call NhlFClose
stop
end
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