/usr/share/ncarg/hluex/streamlineplot/st01c.c is in libncarg-data 6.4.0-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id: st01c.c,v 1.5 2010-03-15 22:49:24 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1996 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
***********************************************************************/
/*
* File: st01c.c
*
* 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
*/
#include <math.h>
#include <ncarg/gks.h>
#include <ncarg/ncargC.h>
#include <ncarg/hlu/hlu.h>
#include <ncarg/hlu/App.h>
#include <ncarg/hlu/NcgmWorkstation.h>
#include <ncarg/hlu/PSWorkstation.h>
#include <ncarg/hlu/PDFWorkstation.h>
#include <ncarg/hlu/CairoWorkstation.h>
#include <ncarg/hlu/StreamlinePlot.h>
#define N 30
#define M 25
#define PI 3.14159
int main(int argc, char *argv[])
{
char const *wks_type = "x11";
int appid,wid,stid,vfid;
int rlist;
ng_size_t len_dims[2];
float U[N][M],V[N][M];
/*
* Generate vector data arrays
*/
{
float igrid, jgrid;
int i,j;
igrid = 2.0 * PI / (float) M;
jgrid = 2.0 * PI / (float) N;
for (j = 0; j < N; j++) {
for (i = 0; i < M; i++) {
U[j][i] = 10.0 * cos(jgrid * (float) j);
V[j][i] = 10.0 * cos(igrid * (float) i);
}
}
}
/*
* Initialize the high level utility library
*/
NhlInitialize();
/*
* Create an application context. Set the app dir to the current
* directory so the application looks for a resource file in the working
* directory.
*/
rlist = NhlRLCreate(NhlSETRL);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"st01",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./st01c.ncgm");
NhlCreate(&wid,"st01Work",
NhlncgmWorkstationClass,NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X workstation.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNwkPause,True);
NhlCreate(&wid,"st01Work",NhlcairoWindowWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"st01c.ps");
NhlCreate(&wid,"st01Work",NhlpsWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"st01c.pdf");
NhlCreate(&wid,"st01Work",NhlpdfWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"pdf") || !strcmp(wks_type,"PDF") ||
!strcmp(wks_type,"ps") || !strcmp(wks_type,"PS")) {
/*
* Create a cairo PS/PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"st01c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st01Work",NhlcairoDocumentWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"st01c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st01Work",NhlcairoImageWorkstationClass,appid,rlist);
}
/*
* Create a VectorField object; then use its id as the value of
* the 'stVectorFieldData' resource when creating the StreamlinePlot object.
*/
len_dims[0] = N;
len_dims[1] = M;
NhlRLClear(rlist);
NhlRLSetMDFloatArray(rlist,NhlNvfUDataArray,&U[0][0],2,len_dims);
NhlRLSetMDFloatArray(rlist,NhlNvfVDataArray,&V[0][0],2,len_dims);
NhlCreate(&vfid,"vectorfield",NhlvectorFieldClass,appid,rlist);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Basic StreamlinePlot Example");
NhlRLSetInteger(rlist,NhlNstVectorFieldData,vfid);
NhlCreate(&stid,"streamline",NhlstreamlinePlotClass,wid,rlist);
NhlDraw(stid);
NhlFrame(wid);
/*
* Destroy the objects created, close the HLU library and exit.
*/
NhlDestroy(appid);
NhlClose();
exit(0);
}
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