/usr/share/ncarg/hluex/xyplot/xy10c.c is in libncarg-data 6.4.0-9.
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** $Id: xy10c.c,v 1.6 2010-03-15 22:49:25 haley Exp $
*/
/***********************************************************************
* *
* Copyright (C) 1995 *
* University Corporation for Atmospheric Research *
* All Rights Reserved *
* *
***********************************************************************/
/*
** File: xy10c.c
**
** Author: Mary Haley
** National Center for Atmospheric Research
** PO 3000, Boulder, Colorado
**
** Date: Thu May 4 15:24:48 MDT 1995
**
** Description: This example shows how to overlay an XyPlot
** on a MapPlot.
*/
#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/XyPlot.h>
#include <ncarg/hlu/MapPlot.h>
#include <ncarg/hlu/CoordArrays.h>
#include <netcdf.h>
/*
* Define the day and the hour for which we are getting data values.
* (March 18, 1995, hour 0).
*/
char *file = "95031800_sao.cdf";
int main()
{
/*
* Declare variables for the HLU routine calls.
*/
int appid, xworkid, xyid1, xyid2, mpid1, mpid2, dataid;
int rlist, i;
float *lat, *lon;
float special_value = -9999.;
/*
* Declare variables for getting information from netCDF file.
*/
int ncid, latid, lonid, recid;
int ndims, nvars, ngatts;
long rec_len;
long start[1], count[1];
char filename[256], recname[50];
const char *dir = _NGGetNCARGEnv("data");
char const *wks_type = "x11";
/*
* Initialize the HLU library and set up resource template.
*/
NhlInitialize();
rlist = NhlRLCreate(NhlSETRL);
/*
* Create Application object. The Application object name is used to
* determine the name of the resource file, which is "xy10.res" in
* this case.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNappDefaultParent,"True");
NhlRLSetString(rlist,NhlNappUsrDir,"./");
NhlCreate(&appid,"xy10",NhlappClass,NhlDEFAULT_APP,rlist);
if (!strcmp(wks_type,"ncgm") || !strcmp(wks_type,"NCGM")) {
/*
* Create a meta file object.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkMetaName,"./xy10c.ncgm");
NhlCreate(&xworkid,"xy10Work",NhlncgmWorkstationClass,
NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"x11") || !strcmp(wks_type,"X11")) {
/*
* Create an X11 workstation.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNwkPause,True);
NhlCreate(&xworkid,"xy10Work",NhlcairoWindowWorkstationClass,
NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"oldps") || !strcmp(wks_type,"OLDPS")) {
/*
* Create an older-style PostScript workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPSFileName,"./xy10c.ps");
NhlCreate(&xworkid,"xy10Work",NhlpsWorkstationClass,
NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"oldpdf") || !strcmp(wks_type,"OLDPDF")) {
/*
* Create an older-style PDF workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkPDFFileName,"./xy10c.pdf");
NhlCreate(&xworkid,"xy10Work",NhlpdfWorkstationClass,
NhlDEFAULT_APP,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,"./xy10c");
NhlRLSetString(rlist,NhlNwkFormat, (char*)wks_type);
NhlCreate(&xworkid,"xy10Work",NhlcairoDocumentWorkstationClass,
NhlDEFAULT_APP,rlist);
}
else if (!strcmp(wks_type,"png") || !strcmp(wks_type,"PNG")) {
/*
* Create a cairo PNG workstation.
*/
NhlRLClear(rlist);
NhlRLSetString(rlist,NhlNwkFileName,"./xy10c");
NhlRLSetString(rlist,NhlNwkFormat, (char*)wks_type);
NhlCreate(&xworkid,"xy10Work",NhlcairoImageWorkstationClass,
NhlDEFAULT_APP,rlist);
}
/*
* Open the netCDF file.
*/
sprintf( filename, "%s/cdf/%s", dir, file );
/*
* Open the netCDF file.
*/
ncid = ncopen(filename,NC_NOWRITE);
/*
* Get the record length and dimension name.
*/
ncinquire(ncid, &ndims, &nvars, &ngatts, &recid);
ncdiminq(ncid, recid, recname, &rec_len);
/*
* Malloc space for lat/lon arrays.
*/
lat = (float *)malloc(sizeof(float)*rec_len);
lon = (float *)malloc(sizeof(float)*rec_len);
if (lat == NULL || lon == NULL ) {
NhlPError(NhlFATAL,NhlEUNKNOWN,
"Unable to malloc space for lat/lon arrays");
exit(1);
}
/*
* Get the ids of the lat/lon arrays.
*/
latid = ncvarid(ncid,"lat");
lonid = ncvarid(ncid,"lon");
/*
* Get lat/lon data values.
*/
start[0] = 0; count[0] = rec_len;
ncvarget(ncid,latid,(long const *)start,(long const *)count,lat);
ncvarget(ncid,lonid,(long const *)start,(long const *)count,lon);
/*
* Close the netCDF file.
*/
ncclose(ncid);
/*
* Throw out values that may be incorrect.
*/
for( i = 0; i < rec_len; i++ ) {
if( lat[i] < -90. || lat[i] > 90.) lat[i] = special_value;
if( lon[i] < -180. || lon[i] > 180.) lon[i] = special_value;
}
/*
* Define the Data object.
*/
NhlRLClear(rlist);
NhlRLSetFloatArray(rlist,NhlNcaXArray,lon,rec_len);
NhlRLSetFloatArray(rlist,NhlNcaYArray,lat,rec_len);
NhlCreate(&dataid,"xyData",NhlcoordArraysClass,
NhlDEFAULT_APP,rlist);
/*
* The id for this Data object is now the resource value for
* "xyCoordData". Tweak some XyPlot resources in the resource file
* ("xy10.res").
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNxyCoordData,dataid);
NhlCreate(&xyid1,"xyPlot1",NhlxyPlotClass,xworkid,rlist);
/*
* Plot all of the station ids.
*/
NhlDraw(xyid1);
NhlFrame(xworkid);
/*
* Create a second XyPlot object with a different name so we can
* change the "tr" resources to limit the plot within the mainland
* United States.
*/
NhlRLClear(rlist);
NhlRLSetInteger(rlist,NhlNxyCoordData,dataid);
NhlCreate(&xyid2,"xyPlot2",NhlxyPlotClass,xworkid,rlist);
/*
* Plot station ids over mainland United States only. This is done
* using resources in the "xy10.res" resource file.
*/
NhlDraw(xyid2);
NhlFrame(xworkid);
/*
* Create two MapPlots, one of the world and one of the United States
* (projection parameters are set up in the "xy10.res" resource file).
*/
NhlCreate(&mpid1,"mpPlot1",NhlmapPlotClass,xworkid,0);
NhlCreate(&mpid2,"mpPlot2",NhlmapPlotClass,xworkid,0);
/*
* Draw the two map plots.
*/
NhlDraw(mpid1);
NhlFrame(xworkid);
NhlDraw(mpid2);
NhlFrame(xworkid);
/*
* Overlay the first XyPlot object on the first MapPlot object. This
* will plot station ids over the world.
*/
NhlAddOverlay(mpid1,xyid1,-1);
NhlDraw(mpid1);
NhlFrame(xworkid);
/*
* Overlay the second XyPlot object on the second MapPlot object. This
* will plot station ids over mainland United States only.
*/
NhlAddOverlay(mpid2,xyid2,-1);
NhlDraw(mpid2);
NhlFrame(xworkid);
/*
* NhlDestroy destroys the given id and all of its children so
* destroying "appid" will destroy "xworkid" which will also destroy
* "xyid".
*/
NhlRLDestroy(rlist);
NhlDestroy(xworkid);
NhlDestroy(appid);
/*
* Restores state.
*/
NhlClose();
exit(0);
}
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