/usr/share/ncarg/hluex/streamlineplot/st03c.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 | /*
* $Id: st03c.c,v 1.7 2010-03-15 22:49:24 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1996 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
***********************************************************************/
/*
* File: st03c.c
*
* Author: David Brown (converted by Mary Haley)
* National Center for Atmospheric Research
* PO 3000, Boulder, Colorado
*
* Date: Thu June 27 8:46:55 MST 1996
*
* Description:
* This plot shows a StreamlinePlot overlaid on a polar
* stereographic map projection. It illustrates some of
* the problems with streamlines when the transformation to
* NDC results in grid cells that vary widely in size.
* Adjustment of certain parameters may improve the
* appearance somewhat, but not as much as might be
* desired. For this and other reasons, StreamlinePlot is
* still undergoing development and its output may be
* expected to change in the next release.
* The data is extracted from an NMC forecast dataset for
* 11/10/1994.
*/
#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>
#include <ncarg/hlu/MapPlot.h>
#include <netcdf.h>
int main(int argc, char *argv[])
{
char const *wks_type = "x11";
int appid, wid, dataid, stid, mpid;
int rlist, grlist;
ng_size_t len_dims[2];
long start[2], count[2], lonlen, latlen;
int ncid, uid, vid, latid, lonid;
float *U, *V, stepsize, spacing;
char filename[256];
const char *dir = _NGGetNCARGEnv("data");
/*
* 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);
grlist = NhlRLCreate(NhlGETRL);
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"st03",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./st03c.ncgm");
NhlCreate(&wid,"st03Work",
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,"st03Work",NhlcairoWindowWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"st03c.ps");
NhlCreate(&wid,"st03Work",NhlpsWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"st03c.pdf");
NhlCreate(&wid,"st03Work",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,"st03c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st03Work",NhlcairoDocumentWorkstationClass,appid,rlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"st03c");
NhlRLSetString(rlist,NhlNwkFormat,(char*)wks_type);
NhlCreate(&wid,"st03Work",NhlcairoImageWorkstationClass,appid,rlist);
}
/*
* Open the netCDF file.
*/
sprintf( filename, "%s/cdf/941110_UV.cdf", dir );
ncid = ncopen(filename,NC_NOWRITE);
/*
* Get the data.
*/
latid = ncdimid(ncid,"lat");
lonid = ncdimid(ncid,"lon");
ncdiminq(ncid,latid,(char *)0,&latlen);
ncdiminq(ncid,lonid,(char *)0,&lonlen);
uid = ncvarid(ncid,"u");
vid = ncvarid(ncid,"v");
start[0] = start[1] = 0;
count[0] = latlen; count[1] = lonlen;
U = (float *)malloc(sizeof(float)*latlen*lonlen);
V = (float *)malloc(sizeof(float)*latlen*lonlen);
ncvarget(ncid,uid,(long const *)start,(long const *)count,U);
ncvarget(ncid,vid,(long const *)start,(long const *)count,V);
/*
* 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)
*/
len_dims[0] = latlen;
len_dims[1] = lonlen;
NhlRLClear(rlist);
NhlRLSetMDFloatArray(rlist,NhlNvfUDataArray,U,2,len_dims);
NhlRLSetMDFloatArray(rlist,NhlNvfVDataArray,V,2,len_dims);
NhlRLSetFloat(rlist,NhlNvfXCStartV, -180.0);
NhlRLSetFloat(rlist,NhlNvfXCEndV, 180.0);
NhlRLSetFloat(rlist,NhlNvfYCStartV, -90.0);
NhlRLSetFloat(rlist,NhlNvfYCEndV, 90.0);
NhlRLSetFloat(rlist,NhlNvfYCStartSubsetV, 0.0);
NhlRLSetFloat(rlist,NhlNvfYCEndSubsetV, 87.5);
NhlCreate(&dataid,"vfield",NhlvectorFieldClass,appid,rlist);
/*
* Create a StreamlinePlot object, supplying the VectorField object as data
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,
"StreamlinePlot Overlaying MapPlot");
NhlRLSetInteger(rlist,NhlNstVectorFieldData,dataid);
NhlCreate(&stid,"streamlineplot",NhlstreamlinePlotClass,wid,rlist);
NhlCreate(&mpid,"mapplot",NhlmapPlotClass,wid,0);
NhlAddOverlay(mpid,stid,-1);
NhlDraw(mpid);
NhlFrame(wid);
NhlRLClear(grlist);
NhlRLGetFloat(grlist,NhlNstStepSizeF,&stepsize);
NhlRLGetFloat(grlist,NhlNstMinLineSpacingF,&spacing);
NhlGetValues(stid,grlist);
/*
* Set the minimum arrow spacing
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Setting the Minimum Arrow Spacing");
NhlRLSetFloat(rlist,NhlNstMinArrowSpacingF,0.025);
NhlSetValues(stid,rlist);
NhlDraw(mpid);
NhlFrame(wid);
/*
* Set the minimum line spacing
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Smaller Line Spacing");
NhlRLSetFloat(rlist,NhlNstMinLineSpacingF,spacing * 0.5);
NhlSetValues(stid,rlist);
NhlDraw(mpid);
NhlFrame(wid);
/*
* Set the step size
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNtiMainString,"Smaller Step Size");
NhlRLSetFloat(rlist,NhlNstStepSizeF,stepsize * 0.5);
NhlSetValues(stid,rlist);
NhlDraw(mpid);
NhlFrame(wid);
/*
* Clean up
*/
NhlDestroy(appid);
NhlClose();
exit(0);
}
|