/usr/share/ncarg/hluex/contourplot/cn13c.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: cn13c.c,v 1.8 2010-03-15 22:49:23 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1995 *
* University Corporation for Atmospheric Research *
* The use of this Software is governed by a License Agreement *
* *
***********************************************************************/
/*
** File: cn13c.c
**
** Author: Mary Haley
** National Center for Atmospheric Research
** PO 3000, Boulder, Colorado
**
** Date: Fri Oct 20 13:28:23 MDT 1995
**
** Description: This example emulates LLU example "mpex10". It shows
** how to do inverse map tranformations and raster contour
** plots.
*/
#include <stdio.h>
#include <math.h>
#include <ncarg/hlu/hlu.h>
#include <ncarg/hlu/ResList.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/ContourPlot.h>
#include <ncarg/hlu/MapPlot.h>
#include <ncarg/hlu/ScalarField.h>
#include <math.h>
#define NCLS 300
#define DTOR .017453292519943
#define NCOLORS 66
#define max(x,y) ((x) > (y) ? (x) : (y))
#define min(x,y) ((x) < (y) ? (x) : (y))
float x[NCLS*NCLS], y[NCLS*NCLS],rlat[NCLS*NCLS], rlon[NCLS*NCLS];
int main()
{
float dval, oor, icra[NCLS][NCLS], miss_val = 1.e12;
int appid, workid, dataid, cnid, mpid;
int srlist, i, j, l, status;
ng_size_t count[2];
NhlErrorTypes ierr;
/*
* Declare variables for defining color map.
*/
ng_size_t length[2];
float cmap[NCOLORS][3];
/*
* Default is to display to an X11 window.
*/
char const *wks_type = "x11";
/*
* Initialize the HLU library and set up resource template.
*/
NhlInitialize();
srlist = NhlRLCreate(NhlSETRL);
/*
* Create Application object.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNappDefaultParent,"True");
NhlRLSetString(srlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"cn13",NhlappClass,NhlDEFAULT_APP,srlist);
/*
* Modify the color map. Colors for contour fill areas varying from
* blue to red.
*/
cmap[ 0][0] = 0.00; cmap[ 0][1] = 0.00; cmap[ 0][2] = 0.00;
cmap[ 1][0] = 1.00; cmap[ 1][1] = 1.00; cmap[ 1][2] = 1.00;
for( i = 1; i <= NCOLORS-2; i++ ) {
cmap[i+1][0] = (float)(i-1)/(float)(NCOLORS-3);
cmap[i+1][1] = 0.;
cmap[i+1][2] = (float)((NCOLORS-2)-i)/(float)(NCOLORS-3);
}
length[0] = NCOLORS; length[1] = 3;
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file object.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkMetaName,"./cn13c.ncgm");
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlncgmWorkstationClass,
NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X11 workstation.
*/
NhlRLClear(srlist);
NhlRLSetInteger(srlist,NhlNwkPause,True);
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlcairoWindowWorkstationClass,
NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkPSFileName,"./cn13c.ps");
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlpsWorkstationClass,
NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkPDFFileName,"./cn13c.pdf");
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlpdfWorkstationClass,
NhlDEFAULT_APP,srlist);
}
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(srlist);
NhlRLSetString(srlist,NhlNwkFileName,"./cn13c");
NhlRLSetString(srlist,NhlNwkFormat,(char*)wks_type);
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlcairoDocumentWorkstationClass,
NhlDEFAULT_APP,srlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNwkFileName,"./cn13c");
NhlRLSetString(srlist,NhlNwkFormat,(char*)wks_type);
NhlRLSetMDFloatArray(srlist,NhlNwkColorMap,&cmap[0][0],2,length);
NhlCreate(&workid,"cn13Work",NhlcairoImageWorkstationClass,
NhlDEFAULT_APP,srlist);
}
/*
* Create a MapPlot object.
*/
NhlRLClear(srlist);
NhlRLSetString(srlist,NhlNmpProjection,"Orthographic");
NhlRLSetFloat(srlist,NhlNmpCenterLatF,40.);
NhlRLSetFloat(srlist,NhlNmpCenterLonF,-105.);
NhlRLSetFloat(srlist,NhlNmpCenterRotF,0.);
NhlCreate(&mpid,"MapPlot",NhlmapPlotClass,workid,srlist);
/*
* Calculate nice range of x,y values, and then get their
* corresponding lon,lat values.
*/
l = 0;
for( i = 0; i < NCLS; i++ ) {
for( j = 0; j < NCLS; j++ ) {
x[l] = .05+.90*((float)i+.5)/(float)NCLS;
y[l] = .05+.90*((float)j+.5)/(float)NCLS;
l++;
}
}
ierr = NhlNDCToData(mpid,x,y,NCLS*NCLS,rlon,rlat,NULL,NULL,&status,&oor);
/*
* Now create a cell array.
*/
l = 0;
for( i = 0; i < NCLS; i++ ) {
for( j = 0; j < NCLS; j++ ) {
if( rlat[l] == oor ) {
icra[j][i] = miss_val;
}
else {
dval=.25*(1.+cos(DTOR*10.*rlat[l]))+
.25*(1.+sin(DTOR*10.*rlon[l]))*cos(DTOR*rlat[l]);
icra[j][i] = 2.+dval*(float)(NCOLORS-2);
if( icra[j][i] != miss_val) icra[j][i] = min((float)(NCOLORS-1),icra[j][i] );
}
l++;
}
}
/*
* Create a scalar field object.
*/
count[0] = count[1] = NCLS;
NhlRLClear(srlist);
NhlRLSetMDFloatArray(srlist,NhlNsfDataArray,&icra[0][0],2,count);
NhlRLSetFloat(srlist,NhlNsfMissingValueV,miss_val);
NhlCreate(&dataid,"DataItem",NhlscalarFieldClass,appid,srlist);
/*
* Create contour object.
*/
NhlRLClear(srlist);
NhlRLSetInteger(srlist,NhlNcnScalarFieldData,dataid);
NhlCreate(&cnid,"ContourPlot",NhlcontourPlotClass,workid,srlist);
/*
* Draw MapPlot on ContourPlot.
*/
NhlDraw(cnid);
NhlDraw(mpid);
NhlFrame(workid);
/*
* NhlDestroy destroys the given id and all of its children.
*/
NhlRLDestroy(srlist);
NhlDestroy(appid);
/*
* Restores state.
*/
NhlClose();
exit(0);
}
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