/usr/share/ncarg/nclex/streamlineplot/st02n.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: st02n.ncl
;
; Author: David Brown
; National Center for Atmospheric Research
; PO 3000, Boulder, Colorado
;
;
; Date: Wed Apr 3 17:00:55 MST 1996
;
; Description: Given a simple mathematically generated data set,
; demonstrates line-drawn streamline arrows and the use
; of some basic StreamlinePlot resources
;
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 "st02" 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 "st02Work" ncgmWorkstationClass defaultapp
"wkMetaName" : "./st02n.ncgm"
end create
end if
if (str_lower(wks_type).eq."x11") then
;
; Create an X workstation.
;
wid = create "st02Work" windowWorkstationClass defaultapp
"wkPause" : True
end create
end if
if (str_lower(wks_type).eq."oldps") then
;
; Create an older-style PostScript workstation.
;
wid = create "st02Work" psWorkstationClass defaultapp
"wkPSFileName" : "./st02n.ps"
end create
end if
if (str_lower(wks_type).eq."oldpdf") then
;
; Create an older-style PDF workstation.
;
wid = create "st02Work" pdfWorkstationClass defaultapp
"wkPDFFileName" : "./st02n.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 "st02Work" documentWorkstationClass defaultapp
"wkFileName" : "./st02n"
"wkFormat" : wks_type
end create
end if
if (str_lower(wks_type).eq."png") then
;
; Create a cairo PNG Workstation object.
;
wid = create "st02Work" imageWorkstationClass defaultapp
"wkFileName" : "./st02n"
"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 "vfield" vectorFieldClass appid
"vfUDataArray" : U( y | :, x | :)
"vfVDataArray" : V
end create
;
; Create a StreamlinePlot object, supplying the VectorField object as data
;
stid = create "streamlineplot" streamlinePlotClass wid
"tiMainString" : "Modifying StreamlinePlot resources"
"stVectorFieldData" : vfid
end create
draw(stid)
frame(wid)
;
; Get the values of several resources that are set dynamically based
; on the assumed NDC size of a grid cell. Each of this will be separately
; modified in the course of this example to illustrate their effect.
;
getvalues stid
"stStepSizeF" : stepsize
"stArrowLengthF" : arrowlength
"stMinLineSpacingF" : spacing
end getvalues
;
; Increase the step size
;
setvalues stid
"tiMainString" : "Larger Step Size"
"stStepSizeF" : stepsize * 4.0
end setvalues
draw(stid)
frame(wid)
;
; Decrease the step size
;
setvalues stid
"tiMainString" : "Smaller Step Size"
"stStepSizeF" : stepsize * 0.25
end setvalues
draw(stid)
frame(wid)
;
; Increase the minimum line spacing
;
setvalues stid
"tiMainString" : "Larger Minimum Line Spacing"
"stMinLineSpacingF" : spacing * 4.0
"stStepSizeF" : stepsize
end setvalues
draw(stid)
frame(wid)
;
; Decrease the minimum line spacing
;
setvalues stid
"tiMainString" : "Smaller Minimum Line Spacing"
"stMinLineSpacingF" : spacing * 0.25
end setvalues
draw(stid)
frame(wid)
;
; Increase the line starting grid stride
;
setvalues stid
"tiMainString" : "Larger Line Starting Grid Stride"
"stMinLineSpacingF" : spacing
"stLineStartStride" : 3
end setvalues
draw(stid)
frame(wid)
;
; Decrease the line starting grid stride
;
setvalues stid
"tiMainString" : "Smaller Line Starting Grid Stride"
"stLineStartStride" : 1
end setvalues
draw(stid)
frame(wid)
;
; Increase the arrow size
;
setvalues stid
"tiMainString" : "Larger Arrows"
"stLineStartStride" : 2
"stArrowLengthF" : arrowlength * 2.0
end setvalues
draw(stid)
frame(wid)
;
; Clean up
;
delete(appid)
end
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