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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# WCS_GFTERM -- Compute the output FITS CRPIX, CRVAL, and CD arrays from the
# MWCS LTERM and WTERM. Note that the CD matrix terms are still transposed
# from the usual Fortran order.
procedure wcs_gfterm (mw, crpix, crval, cd, ndim)
pointer mw #i the input mwcs pointer
double crpix[ndim] #o the output FITS CRPIX array
double crval[ndim] #o the output FITS CRVAL array
double cd[ndim,ndim] #o the output FITS CD matrix
int ndim #i the dimensionality of the wcs
pointer sp, r, wcd, ltv, ltm, iltm
pointer alert, errmsg
int i, errcode
int errget()
errchk mw_gwtermd, mw_gltermd
begin
call smark (sp)
call salloc (r, ndim, TY_DOUBLE)
call salloc (wcd, ndim * ndim, TY_DOUBLE)
call salloc (ltv, ndim, TY_DOUBLE)
call salloc (ltm, ndim * ndim, TY_DOUBLE)
call salloc (iltm, ndim * ndim, TY_DOUBLE)
iferr {
call mw_gwtermd (mw, Memd[r], crval, Memd[wcd], ndim)
call mw_gltermd (mw, Memd[ltm], Memd[ltv], ndim)
call mwvmuld (Memd[ltm], Memd[r], crpix, ndim)
call aaddd (crpix, Memd[ltv], crpix, ndim)
call mwinvertd (Memd[ltm], Memd[iltm], ndim)
call mwmmuld (Memd[wcd], Memd[iltm], cd, ndim)
} then {
call salloc (alert, SZ_LINE, TY_CHAR)
call salloc (errmsg, SZ_LINE, TY_CHAR)
# Set up a default value.
call aclrd (cd, ndim*ndim)
for (i=1; i <= ndim; i=i+1) {
crpix[i] = 1.0d0
crval[i] = 1.0d0
cd[i,i] = 1.0d0
}
# Send alert to the GUI.
errcode = errget (Memc[errmsg], SZ_LINE)
call sprintf (Memc[alert], SZ_FNAME, "%s\n\"%s\"")
call pargstr ("Error decoding image WCS:")
call pargstr (Memc[errmsg])
call ism_alert (Memc[alert], "", "")
}
call sfree (sp)
end
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