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/*
* Copyright (c) 1999-2003 Smithsonian Astrophysical Observatory
*/
#include <funtoolsP.h>
#include <wcstools/wcs.h>
/*
*
* _FunWCS -- get a WCS struct, transforming table column info if required
* If doimage is true, the physical tcrval values is transformed into image
* crval, otherwise, its just transcribed. The former is used with images,
* the latter is used with events.
*
*/
#ifdef ANSI_FUNC
struct WorldCoor *
_FunWCS(Fun fun, int doimage)
#else
struct WorldCoor *_FunWCS(fun, doimage)
Fun fun;
int doimage;
#endif
{
int i, j;
int ival;
int simple=1;
double dval;
double binsiz;
char *s;
FITSHead iheader;
FITSHead oheader;
FITSCard card;
struct WorldCoor *wcs;
/* make sure we have something to process */
if( !_FunValid(fun) )
return NULL;
/* get type and header info */
FunInfoGet(fun, FUN_HEADER, &iheader, 0);
/* make sure we have something to process */
if( !iheader )
return NULL;
/* process image -- just call wcs routines */
if( iheader->image ){
/* init new wcs */
if( hlength(ft_cards(iheader), 0) < 0 ) return NULL;
wcs = wcsinit(ft_cards(iheader));
return wcs;
}
/* for tables, we can init wcs only the specified columns */
else if( iheader->table ){
/* make sure we have valid binning columns */
if( (fun->bin[0]<0) || (fun->bin[1]<0) )
return NULL;
/* make a copy of the header */
oheader = ft_headcopy(iheader);
/* make sure this is a primary FITS file */
ft_cardfmt((FITSCard)oheader->cards,
"SIMPLE", 0, FT_LOGICAL, &simple, 0, "Standard FITS");
/* add/edit image-related keywords based on the orig binning values */
ft_headseti(oheader, "NAXIS", 0, fun->dims, "number of axes", 1);
/* set dimension info */
for(j=0; j<fun->dims; j++){
i = fun->bin[j];
if( fun->cols[i] ){
if( doimage && (fun->cols[i]->binsiz > 0) )
binsiz = fun->cols[i]->binsiz;
else
binsiz = 1.0;
ival = (int)tldim(fun->cols[i]->tlmin, fun->cols[i]->tlmax,
binsiz, fun->cols[i]->type);
}
else
ival = 1;
ft_headseti(oheader, "NAXIS", j+1, ival, "axis dimension", 1);
}
/* set bitpix */
ft_headseti(oheader, "BITPIX", 0, 32, "bits/pixel", 1);
/* synchronize the header and the cards after any changes */
ft_syncdata(oheader);
/* transform WCS cards for the specified columns, if we have such */
for(j=1; j<=2; j++){
if( (i=fun->bin[j-1]+1) >= 1 ){
if( (s=ft_headgets(iheader, "TCTYP", i, NULL, &card)) && card ){
ft_headapps(oheader, "CTYPE", j, s, NULL);
xfree(s);
}
if( (s=ft_headgets(iheader, "TCRVL", i, NULL, &card)) && card ){
ft_headappv(oheader, "CRVAL", j, s, NULL);
xfree(s);
}
if( (dval=ft_headgetr(iheader, "TCDLT", i, 0.0, &card)) && card ){
/* factor in binsize */
if( doimage && (fun->cols[i-1]->binsiz >0) )
dval *= fun->cols[i-1]->binsiz;
ft_headsetr(oheader, "CDELT", j, dval, 15, NULL, 1);
}
if( (s=ft_headgets(iheader, "TCROT", i, NULL, &card)) && card ){
ft_headappv(oheader, "CROTA", j, s, NULL);
xfree(s);
}
if( (dval=ft_headgetr(iheader, "TCRPX", i, 0.0, &card)) && card ){
/* convert floating WCS center value from physical to image coords */
if( doimage ){
if( fun->cols[i-1] )
dval = tlp2i(dval,
fun->cols[i-1]->tlmin, fun->cols[i-1]->binsiz, 'D');
}
ft_headsetr(oheader, "CRPIX", j, dval, 15, NULL, 1);
}
}
}
/* init new wcs */
hlength(ft_cards(oheader),0);
wcs = wcsinit(ft_cards(oheader));
ft_headfree(oheader, 1);
return wcs;
}
/* some other type */
else
return NULL;
}
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