/usr/share/ncarg/nclex/streamlineplot/st01n.ncl is in libncarg-data 6.1.2-7.
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; ;
; Copyright (C) 1993 ;
; University Corporation for Atmospheric Research ;
; All Rights Reserved ;
; ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; File: st01n.ncl
;
; Author: David Brown
; National Center for Atmospheric Research
; PO 3000, Boulder, Colorado
;
;
; Date: Wed Apr 3 17:00:55 MST 1996
;
; Description: Basic StreamlinePlot example
;
begin
N=30
M=25
PI=3.14159
;
; Generate vector data arrays
;
V = 10.0 * cos(onedtond((2.0 * PI / M) * ispan(0,M-1,1),(/N,M/)))
U = 10.0 * cos(onedtond((2.0 * PI / N) * ispan(0,N-1,1),(/M,N/)))
;
; We will need to transpose U so dimension names will be needed
;
U!0 = "x"
U!1 = "y"
;
; Create an application context. Set the app dir to the current directory
; so the application looks for a resource file in the working directory.
;
appid = create "st01" appClass defaultapp
"appUsrDir" : "./"
"appDefaultParent" : True
end create
;
; Default is to display output to an X workstation
;
wks_type = "x11"
if (str_lower(wks_type).eq."ncgm")
;
; Create an NCGM workstation.
;
wid = create "st01Work" ncgmWorkstationClass defaultapp
"wkMetaName" : "./st01n.ncgm"
end create
end if
if (str_lower(wks_type).eq."x11") then
;
; Create an X workstation.
;
wid = create "st01Work" windowWorkstationClass defaultapp
"wkPause" : True
end create
end if
if (str_lower(wks_type).eq."oldps") then
;
; Create an older-style PostScript workstation.
;
wid = create "st01Work" psWorkstationClass defaultapp
"wkPSFileName" : "./st01n.ps"
end create
end if
if (str_lower(wks_type).eq."oldpdf") then
;
; Create an older-style PDF workstation.
;
wid = create "st01Work" pdfWorkstationClass defaultapp
"wkPDFFileName" : "./st01n.pdf"
end create
end if
if (str_lower(wks_type).eq."pdf".or.str_lower(wks_type).eq."ps") then
;
; Create a cairo PS/PDF Workstation object.
;
wid = create "st01Work" documentWorkstationClass defaultapp
"wkFileName" : "./st01n"
"wkFormat" : wks_type
end create
end if
if (str_lower(wks_type).eq."png") then
;
; Create a cairo PNG Workstation object.
;
wid = create "st01Work" imageWorkstationClass defaultapp
"wkFileName" : "./st01n"
"wkFormat" : wks_type
end create
end if
;
; Create a VectorField data object using the data set defined above.
; By default the array bounds will define the data boundaries (zero-based,
; as in C language conventions)
;
vfid = create "vectorfield" vectorFieldClass appid
"vfUDataArray" : U( y | :, x | :) ; Transpose of U
"vfVDataArray" : V
end create
;
; Create a StreamlinePlot object, supplying the VectorField object as data.
;
stid = create "streamlineplot" streamlinePlotClass wid
"tiMainString" : "Basic StreamlinePlot Example"
"stVectorFieldData" : vfid
end create
draw(stid)
frame(wid)
;
; Clean up
;
delete(appid)
end
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