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/*============================================================================
WCSLIB 5.16 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2017, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Direct correspondence concerning WCSLIB to mark@calabretta.id.au
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id: tdisiter.c,v 5.16 2017/01/15 04:25:02 mcalabre Exp $
*=============================================================================
*
* tdisiter tests the external setting of ITERMAX in disx2p(), particularly
* for distortions such as SIP that may optionally provide an approximation
* of their inverses.
*
*---------------------------------------------------------------------------*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wcserr.h>
#include <wcshdr.h>
#include <wcsprintf.h>
#include <dis.h>
int disitermax(int itermax);
#define HEADER_SIZE 36000
int main(int argc, char *argv[])
{
char *infile = "SIP.fits";
char keyrec[81], header[288001];
int gotend, iblock, ikeyrec, j, k, n, naxis[4], nkeyrec, nreject, nwcs;
double discrd[4], rawcrd[4];
FILE *fptr;
struct disprm *dis;
struct wcsprm *wcs;
wcserr_enable(1);
wcsprintf_set(stdout);
/* Set line buffering in case stdout is redirected to a file, otherwise
* stdout and stderr messages will be jumbled (stderr is unbuffered). */
setvbuf(stdout, NULL, _IOLBF, 0);
/* Optional file name specified? */
if (1 < argc) {
infile = argv[1];
}
/* Read in the FITS header, excluding COMMENT and HISTORY keyrecords. */
if ((fptr = fopen(infile, "r")) == 0) {
wcsprintf("ERROR opening %s\n", infile);
return 1;
}
memset(naxis, 0, 2*sizeof(int));
k = 0;
nkeyrec = 0;
gotend = 0;
for (iblock = 0; iblock < 100; iblock++) {
for (ikeyrec = 0; ikeyrec < 36; ikeyrec++) {
if (fgets(keyrec, 81, fptr) == 0) {
break;
}
if (strncmp(keyrec, " ", 8) == 0) continue;
if (strncmp(keyrec, "COMMENT ", 8) == 0) continue;
if (strncmp(keyrec, "HISTORY ", 8) == 0) continue;
if (strncmp(keyrec, "NAXIS", 5) == 0) {
if (keyrec[5] == ' ') {
sscanf(keyrec+10, "%d", &n);
if (4 < n) {
wcsprintf("ERROR, can't handle more than 4 axes.\n");
return 1;
}
continue;
}
sscanf(keyrec+5, "%d = %d", &j, &n);
naxis[j-1] = n;
continue;
}
strncpy(header+k, keyrec, 80);
k += 80;
nkeyrec++;
if (strncmp(keyrec, "END ", 10) == 0) {
/* An END keyrecord was read, but read the rest of the block. */
gotend = 1;
}
}
if (gotend) break;
}
fclose(fptr);
/* Parse the header. */
if ((wcspih(header, nkeyrec, WCSHDR_none, 2, &nreject, &nwcs, &wcs))) {
wcsperr(wcs, 0x0);
return 1;
}
if (wcsset(wcs)) {
wcsperr(wcs, 0x0);
return 1;
}
dis = wcs->lin.dispre;
disprt(dis);
wcsprintf("\n");
rawcrd[0] = 1;
rawcrd[1] = 1;
rawcrd[2] = 1;
rawcrd[3] = 1;
if (disp2x(dis, rawcrd, discrd)) {
disperr(dis, 0x0);
return 1;
}
wcsprintf(" pix: %18.12f %18.12f\n", rawcrd[0], rawcrd[1]);
wcsprintf(" -> img: %18.12f %18.12f\n", discrd[0], discrd[1]);
disitermax(32);
if (disx2p(dis, discrd, rawcrd)) {
disperr(dis, 0x0);
return 1;
}
wcsprintf(" -> pix: %18.12f %18.12f (ITERMAX == %d)\n",
rawcrd[0], rawcrd[1], disitermax(-1));
disitermax(0);
if (disx2p(dis, discrd, rawcrd)) {
disperr(dis, 0x0);
return 1;
}
wcsprintf(" -> pix: %18.12f %18.12f (ITERMAX == %d)\n",
rawcrd[0], rawcrd[1], disitermax(-1));
wcsvfree(&nwcs, &wcs);
return 0;
}
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