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explorefft.c
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explorefft.c
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#include "presto.h"
#include "cpgplot.h"
/*#undef USEMMAP*/
#ifdef USEMMAP
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#endif
#ifdef USEDMALLOC
#include "dmalloc.h"
#endif
#define DEBUGOUT 0
int compare_birds(const void *ca, const void *cb);
/* Note: zoomlevel is simply (LOGDISPLAYNUM-Log_2(numbins)) */
#define LOGDISPLAYNUM 13 /* 1024: Maximum number of points to display at once */
#define LOGLOCALCHUNK 4 /* 16: Chunk size for polynomial fit */
#define LOGMINBINS 5 /* 32 points */
#define LOGMAXBINS 27 /* 128M points */
#define LOGINITIALNUMBINS 17 /* 131072: The initial number of bins to plot */
#define DISPLAYNUM (1<<LOGDISPLAYNUM)
#define LOCALCHUNK (1<<LOGLOCALCHUNK)
#define MINBINS (1<<LOGMINBINS)
#define MAXBINS (1<<LOGMAXBINS)
#define INITIALNUMBINS (1<<LOGINITIALNUMBINS)
static long long N; /* Number of points in the original time series */
static long long Nfft; /* Number of bins in the FFT */
static double T; /* The time duration of FFT */
static float r0; /* The value of the zeroth Fourier freq */
static infodata idata;
#ifdef USEMMAP
static int mmap_file;
#else
static FILE *fftfile;
#endif
static double norm_const = 0.0; /* Used if the user specifies a power normalization. */
static int numzaplist = 0; /* The number of actual lobin/hibin pairs in zaplist */
static int lenzaplist = 0; /* The number of possible lobin/hibin pairs in zaplist */
static bird *zaplist = NULL;
typedef struct fftpart {
int rlo; /* Lowest Fourier freq displayed */
int numamps; /* Number of raw amplitudes */
float maxrawpow; /* The highest raw power present */
float *rawpowers; /* The raw powers */
float *medians; /* The local median values (chunks of size LOCALCHUNK bins) */
float *normvals; /* The values to use for normalization (default is median/-log(0.5)) */
fcomplex *amps; /* Raw FFT amplitudes */
} fftpart;
typedef struct fftview {
double dr; /* Fourier frequency stepsize (2.0**(-zoomlevel)) */
double centerr; /* The center Fourier freq to plot */
int lor; /* The lowest Fourier freq to plot */
int zoomlevel; /* Positive = zoomed in, Negative = zoomed out */
int numbins; /* The number of full bins from low to high to display */
float maxpow; /* The maximum normalized power in the view */
float powers[DISPLAYNUM]; /* The normalized powers to display */
double rs[DISPLAYNUM]; /* The corresponding Fourier freqs */
} fftview;
/*
static int floor_log2(int nn)
{
int ii=0;
if (nn <= 0)
return -1;
while (nn >> 1){
ii++;
nn >>= 1;
}
return ii;
}
*/
static double plot_fftview(fftview * fv, float maxpow, float charhgt,
float vertline, int vertline_color)
/* The return value is offsetf */
{
int ii;
double lor, lof, hir, hif, offsetf = 0.0;
float *freqs;
cpgsave();
cpgbbuf();
/* Set the "Normal" plotting attributes */
cpgsls(1);
cpgslw(1);
cpgsch(charhgt);
cpgsci(1);
cpgvstd();
if (maxpow == 0.0) /* Autoscale for the maximum value */
maxpow = 1.1 * fv->maxpow;
lor = fv->lor;
lof = lor / T;
hir = lor + fv->dr * DISPLAYNUM;
hif = hir / T;
offsetf = 0.0;
/* Period Labels */
if (fv->zoomlevel >= 0 && lof > 1.0) {
double lop, hip, offsetp = 0.0;
lop = 1.0 / lof;
hip = 1.0 / hif;
offsetp = 0.0;
if ((lop - hip) / hip < 0.001) {
int numchar;
char label[50];
offsetp = 0.5 * (hip + lop);
numchar = snprintf(label, 50, "Period - %.15g (s)", offsetp);
cpgmtxt("T", 2.5, 0.5, 0.5, label);
} else {
cpgmtxt("T", 2.5, 0.5, 0.5, "Period (s)");
}
cpgswin(lop - offsetp, hip - offsetp, 0.0, maxpow);
cpgbox("CIMST", 0.0, 0, "", 0.0, 0);
}
/* Frequency Labels */
if ((hif - lof) / hif < 0.001) {
int numchar;
char label[50];
offsetf = 0.5 * (hif + lof);
numchar = snprintf(label, 50, "Frequency - %.15g (Hz)", offsetf);
cpgmtxt("B", 2.8, 0.5, 0.5, label);
} else {
cpgmtxt("B", 2.8, 0.5, 0.5, "Frequency (Hz)");
}
cpgswin(lof - offsetf, hif - offsetf, 0.0, maxpow);
/* Add zapboxes if required */
if (numzaplist) {
double zaplo, zaphi;
cpgsave();
cpgsci(15);
cpgsfs(1);
for (ii = 0; ii < numzaplist; ii++) {
zaplo = zaplist[ii].lobin;
zaphi = zaplist[ii].hibin;
if ((zaplo < hir && zaplo > lor) || (zaphi < hir && zaphi > lor)) {
cpgrect(zaplo / T - offsetf, zaphi / T - offsetf, 0.0, 0.95 * maxpow);
}
}
cpgunsa();
}
/* Add a background vertical line if requested */
if (vertline != 0.0 && vertline_color != 0) {
cpgsave();
cpgsci(vertline_color);
cpgmove(vertline / T - offsetf, 0.0);
cpgdraw(vertline / T - offsetf, maxpow);
cpgunsa();
}
if (fv->zoomlevel >= 0 && lof > 1.0)
cpgbox("BINST", 0.0, 0, "BCNST", 0.0, 0);
else
cpgbox("BCINST", 0.0, 0, "BCNST", 0.0, 0);
/* Plot the spectrum */
freqs = gen_fvect(DISPLAYNUM);
for (ii = 0; ii < DISPLAYNUM; ii++)
freqs[ii] = fv->rs[ii] / T - offsetf;
if (fv->zoomlevel > 0) { /* Magnified power spectrum */
cpgline(DISPLAYNUM, freqs, fv->powers);
} else { /* Down-sampled power spectrum */
for (ii = 0; ii < DISPLAYNUM; ii++) {
cpgmove(freqs[ii], 0.0);
cpgdraw(freqs[ii], fv->powers[ii]);
}
}
vect_free(freqs);
cpgmtxt("L", 2.5, 0.5, 0.5, "Normalized Power");
cpgebuf();
cpgunsa();
return offsetf;
}
static fftview *get_fftview(double centerr, int zoomlevel, fftpart * fp)
{
int ii;
double split = 1.0 / (double) LOCALCHUNK;
float powargr, powargi;
fftview *fv;
fv = (fftview *) malloc(sizeof(fftview));
fv->zoomlevel = zoomlevel;
fv->centerr = centerr;
if (zoomlevel > 0) { /* Magnified power spectrum */
int numbetween, nextbin, index;
fcomplex *interp;
numbetween = (1 << zoomlevel);
fv->numbins = DISPLAYNUM / numbetween;
fv->dr = 1.0 / (double) numbetween;
fv->lor = centerr - fv->numbins / 2;
if (fv->lor + fv->numbins > Nfft) {
fv->lor = Nfft - fv->numbins;
fv->centerr = fv->lor + fv->numbins / 2;
}
if (fv->lor < 0)
fv->lor = 0;
interp = corr_rz_interp(fp->amps, fp->numamps, numbetween,
fv->lor - fp->rlo, 0.0, DISPLAYNUM * 2,
LOWACC, &nextbin);
if (norm_const == 0.0) {
for (ii = 0; ii < DISPLAYNUM; ii++) {
fv->rs[ii] = fv->lor + ii * fv->dr;
index = (int) ((fv->rs[ii] - fp->rlo) * split + 0.5);
fv->powers[ii] = POWER(interp[ii].r, interp[ii].i) * fp->normvals[index];
}
} else {
for (ii = 0; ii < DISPLAYNUM; ii++) {
fv->rs[ii] = fv->lor + ii * fv->dr;
fv->powers[ii] = POWER(interp[ii].r, interp[ii].i) * norm_const;
}
}
vect_free(interp);
} else { /* Down-sampled power spectrum */
int jj, powindex, normindex, binstocombine;
float *tmprawpwrs, maxpow;
binstocombine = (1 << abs(zoomlevel));
fv->numbins = DISPLAYNUM * binstocombine;
fv->dr = (double) binstocombine;
fv->lor = (int) floor(centerr - 0.5 * fv->numbins);
if (fv->lor + fv->numbins > Nfft) {
fv->lor = Nfft - fv->numbins;
fv->centerr = fv->lor + fv->numbins / 2;
}
if (fv->lor < 0)
fv->lor = 0;
tmprawpwrs = gen_fvect(fv->numbins);
if (norm_const == 0.0) {
for (ii = 0; ii < fv->numbins; ii++) {
powindex = (int) (fv->lor - fp->rlo + ii + 0.5);
normindex = (int) (powindex * split);
tmprawpwrs[ii] = fp->rawpowers[powindex] * fp->normvals[normindex];
}
} else {
for (ii = 0; ii < fv->numbins; ii++) {
powindex = (int) (fv->lor - fp->rlo + ii + 0.5);
tmprawpwrs[ii] = fp->rawpowers[powindex] * norm_const;
}
}
powindex = 0;
for (ii = 0; ii < DISPLAYNUM; ii++) {
maxpow = 0.0;
for (jj = 0; jj < binstocombine; jj++, powindex++)
if (tmprawpwrs[powindex] > maxpow)
maxpow = tmprawpwrs[powindex];
fv->rs[ii] = fv->lor + ii * fv->dr;
fv->powers[ii] = maxpow;
}
}
fv->maxpow = 0.0;
for (ii = 0; ii < DISPLAYNUM; ii++)
if (fv->powers[ii] > fv->maxpow)
fv->maxpow = fv->powers[ii];
return fv;
}
static fftpart *get_fftpart(int rlo, int numr)
{
int ii, jj, index;
float powargr, powargi, tmppwr, chunk[LOCALCHUNK];
fftpart *fp;
if (rlo + numr > Nfft) {
return NULL;
} else {
fp = (fftpart *) malloc(sizeof(fftpart));
fp->rlo = rlo;
fp->numamps = numr;
#ifdef USEMMAP
fp->amps = (fcomplex *) mmap(0, sizeof(fcomplex) * numr, PROT_READ,
MAP_SHARED, mmap_file, 0);
#else
fp->amps = read_fcomplex_file(fftfile, rlo, numr);
#endif
if (rlo == 0)
r0 = fp->amps[0].r;
fp->rawpowers = gen_fvect(fp->numamps);
fp->medians = gen_fvect(fp->numamps / LOCALCHUNK);
fp->normvals = gen_fvect(fp->numamps / LOCALCHUNK);
fp->maxrawpow = 0.0;
for (ii = 0; ii < fp->numamps / LOCALCHUNK; ii++) {
index = ii * LOCALCHUNK;
for (jj = 0; jj < LOCALCHUNK; jj++, index++) {
tmppwr = POWER(fp->amps[index].r, fp->amps[index].i);
if (tmppwr > fp->maxrawpow)
if (rlo || (rlo == 0 && index > 0))
fp->maxrawpow = tmppwr;
fp->rawpowers[index] = tmppwr;
chunk[jj] = tmppwr;
}
if (rlo == 0 && ii == 0) {
chunk[0] = 1.0;
fp->rawpowers[0] = 1.0;
}
fp->medians[ii] = median(chunk, LOCALCHUNK);
fp->normvals[ii] = 1.0 / (1.4426950408889634 * fp->medians[ii]);
}
return fp;
}
}
static void free_fftpart(fftpart * fp)
{
vect_free(fp->normvals);
vect_free(fp->medians);
vect_free(fp->rawpowers);
#ifdef USEMMAP
munmap(fp->amps, sizeof(fcomplex) * fp->numamps);
#else
vect_free(fp->amps);
#endif
free(fp);
}
static double find_peak(float inf, fftview * fv, fftpart * fp)
{
int ii, lobin, hibin, maxbin = 0;
float maxpow = 0.0;
double inr, viewfrac = 0.05, newmaxr, newmaxz;
rderivs derivs;
fourierprops props;
inr = inf * T;
lobin = inr - (fv->numbins * 0.5 * viewfrac);
hibin = inr + (fv->numbins * 0.5 * viewfrac);
for (ii = lobin - fp->rlo; ii < hibin - fp->rlo + 1; ii++) {
if (fp->rawpowers[ii] > maxpow) {
maxpow = fp->rawpowers[ii];
maxbin = ii + fp->rlo;
}
}
maxpow = max_rz_arr(fp->amps, fp->numamps, maxbin, 0.0,
&newmaxr, &newmaxz, &derivs);
newmaxr += fp->rlo;
calc_props(derivs, newmaxr, newmaxz, 0.0, &props);
print_candidate(&props, idata.dt, N, r0, 2);
return newmaxr;
}
static void print_help(void)
{
printf("\n"
" Button or Key Effect\n"
" ------------- ------\n"
" Left Mouse or I Zoom in by a factor of 2\n"
" Right Mouse or O Zoom out by a factor of 2\n"
" Middle Mouse or D Show details about a selected frequency\n"
" < Shift left by a full screen width\n"
" > Shift right by a full screen width\n"
" , Shift left by 1/8 of the screen width\n"
" . Shift right by 1/8 of the screen width\n"
" + or = Increase the power scale (make them taller)\n"
" - or _ Decrease the power scale (make them shorter)\n"
" S Scale the powers automatically\n"
" N Re-normalize the nowers by one of several methods\n"
" P Print the current plot to a file\n"
" G Go to a specified frequency\n"
" L Load a zaplist showing potential RFI locations\n"
" Z Add a frequency chunk to the RFI zaplist\n"
" H Show the harmonics of the center frequency\n"
" ? Show this help screen\n"
" Q Quit\n" "\n");
}
static fftview *get_harmonic(double rr, int zoomlevel, fftpart * fp)
{
int numharmbins;
#ifdef USEMMAP
numharmbins = (1 << (LOGDISPLAYNUM - zoomlevel));
if (rr + numharmbins > Nfft)
return NULL;
else
return get_fftview(rr, zoomlevel, fp);
#else
fftpart *harmpart;
fftview *harmview;
numharmbins = (1 << (LOGDISPLAYNUM - zoomlevel));
harmpart = get_fftpart((int) (rr - numharmbins), 2 * numharmbins);
if (harmpart != NULL) {
harmview = get_fftview(rr, zoomlevel, harmpart);
free_fftpart(harmpart);
return harmview;
} else {
return NULL;
}
#endif
}
static void plot_harmonics(double rr, int zoomlevel, fftpart * fp)
{
int ii, hh;
double offsetf;
char label[20];
fftview *harmview;
cpgsubp(4, 4);
for (ii = 0, hh = 2; ii < 8; ii++, hh++) {
cpgpanl(ii % 4 + 1, ii / 4 + 1);
harmview = get_harmonic(hh * rr, zoomlevel, fp);
if (harmview != NULL) {
offsetf = plot_fftview(harmview, 0.0, 2.0, hh * rr, 2);
snprintf(label, 20, "Harmonic %d", hh);
cpgsave();
cpgsch(2.0);
cpgmtxt("T", -1.8, 0.05, 0.0, label);
cpgunsa();
free(harmview);
}
}
for (ii = 8, hh = 2; ii < 16; ii++, hh++) {
cpgpanl(ii % 4 + 1, ii / 4 + 1);
harmview = get_harmonic(rr / (double) hh, zoomlevel, fp);
if (harmview != NULL) {
offsetf = plot_fftview(harmview, 0.0, 2.0, rr / (double) hh, 2);
snprintf(label, 20, "Harmonic 1/%d", hh);
cpgsave();
cpgsch(2.0);
cpgmtxt("T", -1.8, 0.05, 0.0, label);
cpgunsa();
free(harmview);
}
}
cpgsubp(1, 1);
cpgpanl(1, 1);
cpgsvp(0.0, 1.0, 0.0, 1.0);
cpgswin(2.0, 6.0, -2.0, 2.0);
cpgmove(2.0, 0.0);
cpgslw(3);
cpgdraw(6.0, 0.0);
cpgslw(1);
}
static double harmonic_loop(int xid, double rr, int zoomlevel, fftpart * fp)
{
float inx = 0.0, iny = 0.0;
double retval = 0.0;
int xid2, psid, badchoice = 1;
char choice;
xid2 = cpgopen("/XWIN");
cpgpap(10.25, 8.5 / 11.0);
cpgask(0);
cpgslct(xid2);
plot_harmonics(rr, zoomlevel, fp);
printf(" Click on the harmonic to go it,\n"
" press 'P' to print, or press 'Q' to close.\n");
while (badchoice) {
cpgcurs(&inx, &iny, &choice);
if (choice == 'Q' || choice == 'q') {
badchoice = 0;
} else if (choice == 'P' || choice == 'p') {
int len, numharmbins;
double offsetf;
char filename[200];
fftpart *harmpart;
fftview *harmview;
printf(" Enter the filename to save the plot as:\n");
fgets(filename, 195, stdin);
len = strlen(filename) - 1;
strcpy(filename + len, "/CPS");
psid = cpgopen(filename);
cpgslct(psid);
cpgpap(10.25, 8.5 / 11.0);
cpgiden();
cpgscr(15, 0.8, 0.8, 0.8);
numharmbins = (1 << (LOGDISPLAYNUM - zoomlevel));
harmpart = get_fftpart((int) (rr - numharmbins), 2 * numharmbins);
harmview = get_fftview(rr, zoomlevel, harmpart);
free_fftpart(harmpart);
offsetf = plot_fftview(harmview, 0.0, 1.0, rr, 2);
cpgpage();
plot_harmonics(rr, zoomlevel, fp);
cpgclos();
cpgslct(xid2);
cpgscr(15, 0.4, 0.4, 0.4);
filename[len] = '\0';
printf(" Wrote the plot to the file '%s'.\n", filename);
} else if (choice == 'A' || choice == 'a') {
if (iny > 1.0)
retval = rr * (int) (inx);
else if (iny > 0.0)
retval = rr * ((int) (inx) + 4.0);
else if (iny > -1.0)
retval = rr / (int) (inx);
else
retval = rr / ((int) (inx) + 4.0);
badchoice = 0;
} else {
printf(" Option not recognized.\n");
}
};
cpgclos();
cpgslct(xid);
return retval;
}
int main(int argc, char *argv[])
{
float maxpow = 0.0, inx = 0.0, iny = 0.0;
double centerr, offsetf;
int zoomlevel, maxzoom, minzoom, xid, psid;
char *rootfilenm, inchar;
fftpart *lofp;
fftview *fv;
if (argc == 1) {
printf("\nusage: explorefft fftfilename\n\n");
exit(0);
}
printf("\n\n");
printf(" Interactive FFT Explorer\n");
printf(" by Scott M. Ransom\n");
printf(" October, 2001\n");
print_help();
{
int hassuffix = 0;
char *suffix;
hassuffix = split_root_suffix(argv[1], &rootfilenm, &suffix);
if (hassuffix) {
if (strcmp(suffix, "fft") != 0) {
printf("\nInput file ('%s') must be a FFT file ('.fft')!\n\n", argv[1]);
free(suffix);
exit(0);
}
free(suffix);
} else {
printf("\nInput file ('%s') must be a FFT file ('.fft')!\n\n", argv[1]);
exit(0);
}
}
/* Read the info file */
readinf(&idata, rootfilenm);
if (idata.object) {
printf("Examining %s data from '%s'.\n\n",
remove_whitespace(idata.object), argv[1]);
} else {
printf("Examining data from '%s'.\n\n", argv[1]);
}
N = idata.N;
T = idata.dt * idata.N;
#ifdef USEMMAP
printf("Memory mapping the input FFT. This may take a while...\n");
mmap_file = open(argv[1], O_RDONLY);
{
int rt;
struct stat buf;
rt = fstat(mmap_file, &buf);
if (rt == -1) {
perror("\nError in fstat() in explorefft.c");
printf("\n");
exit(-1);
}
Nfft = buf.st_size / sizeof(fcomplex);
}
lofp = get_fftpart(0, Nfft);
#else
{
int numamps;
fftfile = chkfopen(argv[1], "rb");
Nfft = chkfilelen(fftfile, sizeof(fcomplex));
numamps = (Nfft > MAXBINS) ? (int) MAXBINS : (int) Nfft;
lofp = get_fftpart(0, numamps);
}
#endif
/* Plot the initial data */
{
int initnumbins = INITIALNUMBINS;
if (initnumbins > Nfft) {
initnumbins = next2_to_n(Nfft) / 2;
zoomlevel = LOGDISPLAYNUM - (int) (log(initnumbins) / log(2.0));
minzoom = zoomlevel;
} else {
zoomlevel = LOGDISPLAYNUM - LOGINITIALNUMBINS;
minzoom = LOGDISPLAYNUM - LOGMAXBINS;
}
maxzoom = LOGDISPLAYNUM - LOGMINBINS;
centerr = initnumbins / 2;
}
fv = get_fftview(centerr, zoomlevel, lofp);
/* Prep the XWIN device for PGPLOT */
xid = cpgopen("/XWIN");
if (xid <= 0) {
free(fv);
#ifdef USEMMAP
close(mmap_file);
#else
fclose(fftfile);
#endif
free_fftpart(lofp);
exit(EXIT_FAILURE);
}
cpgscr(15, 0.4, 0.4, 0.4);
cpgask(0);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
do {
cpgcurs(&inx, &iny, &inchar);
if (DEBUGOUT)
printf("You pressed '%c'\n", inchar);
switch (inchar) {
case 'A': /* Zoom in */
case 'a':
centerr = (inx + offsetf) * T;
case 'I':
case 'i':
if (DEBUGOUT)
printf(" Zooming in (zoomlevel = %d)...\n", zoomlevel);
if (zoomlevel < maxzoom) {
zoomlevel++;
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
} else
printf(" Already at maximum zoom level (%d).\n", zoomlevel);
break;
case 'X': /* Zoom out */
case 'x':
case 'O':
case 'o':
if (DEBUGOUT)
printf(" Zooming out (zoomlevel = %d)...\n", zoomlevel);
if (zoomlevel > minzoom) {
zoomlevel--;
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
} else
printf(" Already at minimum zoom level (%d).\n", zoomlevel);
break;
case '<': /* Shift left 1 full screen */
centerr -= fv->numbins + fv->numbins / 8;
case ',': /* Shift left 1/8 screen */
if (DEBUGOUT)
printf(" Shifting left...\n");
centerr -= fv->numbins / 8;
{ /* Should probably get the previous chunk from the fftfile... */
double lowestr;
lowestr = 0.5 * fv->numbins;
if (centerr < lowestr)
centerr = lowestr;
}
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
break;
case '>': /* Shift right 1 full screen */
centerr += fv->numbins - fv->numbins / 8;
case '.': /* Shift right 1/8 screen */
if (DEBUGOUT)
printf(" Shifting right...\n");
centerr += fv->numbins / 8;
{ /* Should probably get the next chunk from the fftfile... */
double highestr;
highestr = lofp->rlo + lofp->numamps - 0.5 * fv->numbins;
if (centerr > highestr)
centerr = highestr;
}
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
break;
case '+': /* Increase height of powers */
case '=':
if (maxpow == 0.0) {
printf(" Auto-scaling is off.\n");
maxpow = 1.1 * fv->maxpow;
}
maxpow = 3.0 / 4.0 * maxpow;
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
break;
case '-': /* Decrease height of powers */
case '_':
if (maxpow == 0.0) {
printf(" Auto-scaling is off.\n");
maxpow = 1.1 * fv->maxpow;
}
maxpow = 4.0 / 3.0 * maxpow;
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
break;
case 'S': /* Auto-scale */
case 's':
if (maxpow == 0.0)
break;
else {
printf(" Auto-scaling is on.\n");
maxpow = 0.0;
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
break;
}
case 'G': /* Goto a frequency */
case 'g':
{
char freqstr[50];
double freq = -1.0;
while (freq < 0.0) {
printf(" Enter the frequency (Hz) to go to:\n");
fgets(freqstr, 50, stdin);
freqstr[strlen(freqstr) - 1] = '\0';
freq = atof(freqstr);
}
offsetf = 0.0;
centerr = freq * T;
printf(" Moving to frequency %.15g.\n", freq);
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, centerr, 2);
}
break;
case 'H': /* Show harmonics */
case 'h':
{
double retval;
retval = harmonic_loop(xid, centerr, zoomlevel, lofp);
if (retval > 0.0) {
offsetf = 0.0;
centerr = retval;
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, centerr, 2);
}
}
break;
case '?': /* Print help screen */
print_help();
break;
case 'D': /* Show details about a selected point */
case 'd':
{
double newr;
printf(" Searching for peak near freq = %.7g Hz...\n", (inx + offsetf));
newr = find_peak(inx + offsetf, fv, lofp);
centerr = newr;
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, centerr, 2);
}
break;
case 'L': /* Load a zaplist */
case 'l':
{
int ii, len;
char filename[200];
double *lobins, *hibins;
printf(" Enter the filename containing the zaplist to load:\n");
fgets(filename, 199, stdin);
len = strlen(filename) - 1;
filename[len] = '\0';
numzaplist = get_birdies(filename, T, 0.0, &lobins, &hibins);
lenzaplist = numzaplist + 20; /* Allow some room to add more */
if (lenzaplist)
free(zaplist);
zaplist = (bird *) malloc(sizeof(bird) * lenzaplist);
for (ii = 0; ii < numzaplist; ii++) {
zaplist[ii].lobin = lobins[ii];
zaplist[ii].hibin = hibins[ii];
}
vect_free(lobins);
vect_free(hibins);
printf("\n");
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
}
break;
case 'Z': /* Add a birdie to a zaplist */
case 'z':
{
int badchoice = 2;
float lox, hix, loy, hiy;
double rs[2];
char choice;
if (numzaplist + 1 > lenzaplist) {
lenzaplist += 10;
zaplist = (bird *) realloc(zaplist, sizeof(bird) * lenzaplist);
}
cpgqwin(&lox, &hix, &loy, &hiy);
printf(" Click the left mouse button on the first frequency limit.\n");
while (badchoice) {
cpgcurs(&inx, &iny, &choice);
if (choice == 'A' || choice == 'a') {
rs[2 - badchoice] = ((double) inx + offsetf) * T;
cpgsave();
cpgsci(7);
cpgmove(inx, 0.0);
cpgdraw(inx, hiy);
cpgunsa();
badchoice--;
if (badchoice == 1)
printf
(" Click the left mouse button on the second frequency limit.\n");
} else {
printf(" Option not recognized.\n");
}
};
if (rs[1] > rs[0]) {
zaplist[numzaplist].lobin = rs[0];
zaplist[numzaplist].hibin = rs[1];
} else {
zaplist[numzaplist].lobin = rs[1];
zaplist[numzaplist].hibin = rs[0];
}
printf(" The new birdie has: f_avg = %.15g f_width = %.15g\n\n",
0.5 * (zaplist[numzaplist].hibin + zaplist[numzaplist].lobin) / T,
(zaplist[numzaplist].hibin - zaplist[numzaplist].lobin) / T);
numzaplist++;
qsort(zaplist, numzaplist, sizeof(bird), compare_birds);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
}
break;
case 'P': /* Print the current plot */
case 'p':
{
int len;
char filename[200];
printf(" Enter the filename to save the plot as:\n");
fgets(filename, 196, stdin);
len = strlen(filename) - 1;
filename[len + 0] = '/';
filename[len + 1] = 'P';
filename[len + 2] = 'S';
filename[len + 3] = '\0';
psid = cpgopen(filename);
cpgslct(psid);
cpgpap(10.25, 8.5 / 11.0);
cpgiden();
cpgscr(15, 0.8, 0.8, 0.8);
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
cpgclos();
cpgslct(xid);
cpgscr(15, 0.4, 0.4, 0.4);
filename[len] = '\0';
printf(" Wrote the plot to the file '%s'.\n", filename);
}
break;
case 'N': /* Changing power normalization */
case 'n':
{
float inx2 = 0.0, iny2 = 0.0;
char choice;
unsigned char badchoice = 1;
printf(" Specify the type of power normalization:\n"
" m,M : Median values determined locally\n"
" d,D : DC frequency amplitude\n"
" r,R : Raw powers (i.e. no normalization)\n"
" u,U : User specified interval (the average powers)\n");
while (badchoice) {
cpgcurs(&inx2, &iny2, &choice);
switch (choice) {
case 'M':
case 'm':
norm_const = 0.0;
maxpow = 0.0;
badchoice = 0;
printf
(" Using local median normalization. Autoscaling is on.\n");
break;
case 'D':
case 'd':
norm_const = 1.0 / r0;
maxpow = 0.0;
badchoice = 0;
printf
(" Using DC frequency (%f) normalization. Autoscaling is on.\n",
r0);
break;
case 'R':
case 'r':
norm_const = 1.0;
maxpow = 0.0;
badchoice = 0;
printf
(" Using raw powers (i.e. no normalization). Autoscaling is on.\n");
break;
case 'U':
case 'u':
{
char choice2;
float xx = inx, yy = iny;
int lor, hir, numr;
double avg, var;
printf
(" Use the left mouse button to select a left and right boundary\n"
" of a region to calculate the average power.\n");
do {
cpgcurs(&xx, &yy, &choice2);
} while (choice2 != 'A' && choice2 != 'a');
lor = (int) ((xx + offsetf) * T);
cpgsci(7);
cpgmove(xx, 0.0);
cpgdraw(xx, 10.0 * fv->maxpow);
do {
cpgcurs(&xx, &yy, &choice2);
} while (choice2 != 'A' && choice2 != 'a');
hir = (int) ((xx + offsetf) * T);
cpgmove(xx, 0.0);
cpgdraw(xx, 10.0 * fv->maxpow);
cpgsci(1);
if (lor > hir) {
int tempr;
tempr = hir;
hir = lor;
lor = tempr;
}
numr = hir - lor + 1;
avg_var(lofp->rawpowers + lor - lofp->rlo, numr, &avg, &var);
printf(" Selection has: average = %.5g\n"
" std dev = %.5g\n", avg, sqrt(var));
norm_const = 1.0 / avg;
maxpow = 0.0;
badchoice = 0;
printf
(" Using %.5g as the normalization constant. Autoscaling is on.\n",
avg);
break;
}
default:
printf(" Unrecognized choice '%c'.\n", choice);
break;
}
}
free(fv);
fv = get_fftview(centerr, zoomlevel, lofp);
cpgpage();
offsetf = plot_fftview(fv, maxpow, 1.0, 0.0, 0);
}
break;
case 'Q': /* Quit */