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/* XNECVIEW - a program for visualizing NEC2 structure and gain files
*
* Copyright (C) 1998-1999, P.T. de Boer -- pa3fwm@amsat.org
*
* Distributed on the conditions of the GPL: see the files README and
* COPYING, which accompany this source file.
*
* This module parses NEC2's output, extracting the gain as a function of
* direction from it.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xnecview.h"
double maxdb;
int read_nec_output(FILE *f) /* tries to read NEC output data from f; returns 1 if not succesful */
{
char s[200];
double phi,theta,db;
int i;
int end=0;
do fgets(s,200,f); while (!feof(f) && !strstr(s,"RADIATION PATTERNS"));
if (feof(f)) return 1;
/* Some versions of NEC2 output extraneous data here before the actual data
* and column labels (e.g. RANGE = and EXP (-JKR) values ). Discard until
* the true bottom of the column labels (look for DB) */
do fgets(s,200,f); while (!feof(f) && !strstr(s,"DB"));
if (feof(f)) return 1;
fgets(s,200,f);
removecommas(s);
if (sscanf(s,"%lg%lg%*g%*g%lg",&theta,&phi,&db)!=3) return 1;
gphi[0]=phi;
numphi=1;
maxdb=db;
do {
if (numtheta>=MAXTHETAS) {
fprintf(stderr,"Output file contains data at more theta values than allowed (%i)\n",MAXTHETAS);
exit(1);
}
gain[numtheta][numphi-1]=db;
gtheta[numtheta++]=theta*M_PI/180;
if (db>maxdb) maxdb=db;
fgets(s,200,f);
removecommas(s);
if (sscanf(s,"%lg%lg%*g%*g%lg",&theta,&phi,&db)!=3) { end=1; break; }
} while (phi==gphi[0]);
gphi[0]*=M_PI/180;
if (end) return 0;
i=0;
while (1) {
if (i==0) {
if (numphi>=MAXPHIS) {
fprintf(stderr,"Output file contains data at more phi values than allowed (%i)\n",MAXPHIS);
exit(1);
}
gphi[numphi++]=phi*M_PI/180;
}
gain[i][numphi-1]=db;
if (db>maxdb) maxdb=db;
if (++i==numtheta) i=0;
fgets(s,200,f);
removecommas(s);
if (sscanf(s,"%lg%lg%*g%*g%lg",&theta,&phi,&db)!=3) break;
}
printf("Maximum gain = %g dBi\n",maxdb);
return 0;
}
void process_nec_output() /* transform the gain data array into an array of points in 3D space */
{
int i,j;
double r=0;
if (extr==0) extr=1;
else extr*=GAINSIZE;
for (i=0;i<numtheta;i++)
for (j=0;j<numphi;j++) {
switch (gainscale) {
case GSlin: r=pow(10.0,(gain[i][j]-maxdb)/10); break; /* linear */
case GSarrl: r=exp(0.116534*(gain[i][j]-maxdb)/2); break; /* arrl */
case GSlog: r=gain[i][j]-maxdb; if (r<-40) r=0; else r=r/40+1; break; /* log */
}
r*=extr;
gpo[i][j].x = cos(gphi[j])*sin(gtheta[i])*r;
gpo[i][j].y = sin(gphi[j])*sin(gtheta[i])*r;
gpo[i][j].z = cos(gtheta[i])*r;
}
}
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