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include <imhdr.h>
include <math.h>
include <mwset.h>
include <pkg/skywcs.h>
# RG_CELTOSTD - Convert the longitude / latitude coordinates to standard
# coordinates given the position of the reference point and the form of
# the projection.
procedure rg_celtostd (projection, lngref, latref, xi, eta, npts, reflng,
reflat, lngunits, latunits)
char projection[ARB] #I the projection type
double lngref[ARB] #I the input ra / longitude coordinates
double latref[ARB] #I the input dec / latitude coordinates
double xi[ARB] #O the output ra / longitude std coordinates
double eta[ARB] #O the output dec / latitude std coordinates
int npts #I the number of data points
double reflng #I the ra / longitude reference point
double reflat #I the dec / latitude reference point
int lngunits #I the ra / longitude units
int latunits #I the dec / latitude units
double tlngref, tlatref
int i
pointer mw, ct
pointer rg_projwcs(), mw_sctran()
errchk mw_sctran()
begin
# Initialize the projection transformation.
mw = rg_projwcs (projection, reflng, reflat, lngunits, latunits)
# Compile the transformation.
ct = mw_sctran (mw, "world", "logical", 03B)
# Evaluate the standard coordinates.
do i = 1, npts {
switch (lngunits) {
case SKY_DEGREES:
tlngref = lngref[i]
case SKY_RADIANS:
tlngref = RADTODEG(lngref[i])
case SKY_HOURS:
tlngref = 15.0d0 * lngref[i]
default:
tlngref = lngref[i]
}
switch (latunits) {
case SKY_DEGREES:
tlatref = latref[i]
case SKY_RADIANS:
tlatref = RADTODEG(latref[i])
case SKY_HOURS:
tlatref = 15.0d0 * latref[i]
default:
tlatref = latref[i]
}
call mw_c2trand (ct, tlngref, tlatref, xi[i], eta[i])
}
call mw_close (mw)
end
# RG_STDTOCEL - Convert the longitude / latitude coordinates to standard
# coordinates given the position of the reference point and the form of
# the projection.
procedure rg_stdtocel (projection, xi, eta, lngfit, latfit, npts, reflng,
reflat, lngunits, latunits)
char projection[ARB] #I the sky projection geometry
double xi[ARB] #I the output ra / longitude std coordinates
double eta[ARB] #I the output dec / latitude std coordinates
double lngfit[ARB] #O the input ra / longitude coordinates
double latfit[ARB] #O the input dec / latitude coordinates
int npts #I the number of data points
double reflng #I the ra / longitude reference point
double reflat #I the dec / latitude reference point
int lngunits #I the ra / longitude units
int latunits #I the dec / latitude units
double tlngref, tlatref
int i
pointer mw, ct
pointer rg_projwcs(), mw_sctran()
errchk mw_sctran()
begin
# Initialize the projection transformation.
mw = rg_projwcs (projection, reflng, reflat, lngunits, latunits)
# Compile the transformation.
ct = mw_sctran (mw, "logical", "world", 03B)
# Evaluate the standard coordinates.
do i = 1, npts {
call mw_c2trand (ct, xi[i], eta[i], tlngref, tlatref)
switch (lngunits) {
case SKY_DEGREES:
lngfit[i] = tlngref
case SKY_RADIANS:
lngfit[i] = DEGTORAD(tlngref)
case SKY_HOURS:
lngfit[i] = tlngref / 15.0d0
default:
lngfit[i] = tlngref
}
switch (latunits) {
case SKY_DEGREES:
latfit[i] = tlatref
case SKY_RADIANS:
latfit[i] = DEGTORAD(tlatref)
case SKY_HOURS:
latfit[i] = tlatref / 15.0d0
default:
latfit[i] = tlatref
}
}
call mw_close (mw)
end
# RG_PROJWCS -- Set up a projection wcs given the projection type, the
# coordinates of the reference point, and the reference point units.
pointer procedure rg_projwcs (projection, reflng, reflat, lngunits, latunits)
char projection[ARB] #I the projection type
double reflng #I the ra / longitude reference point
double reflat #I the dec / latitude reference point
int lngunits #I the ra / longitude units
int latunits #I the dec / latitude units
int ndim
pointer sp, projstr, projpars, wpars, ltm, ltv, cd, r, w, mw, axes
pointer mw_open()
begin
ndim = 2
# Allocate working space.
call smark (sp)
call salloc (projstr, SZ_FNAME, TY_CHAR)
call salloc (projpars, SZ_LINE, TY_CHAR)
call salloc (wpars, SZ_LINE, TY_CHAR)
call salloc (ltm, ndim * ndim, TY_DOUBLE)
call salloc (ltv, ndim, TY_DOUBLE)
call salloc (cd, ndim * ndim, TY_DOUBLE)
call salloc (r, ndim, TY_DOUBLE)
call salloc (w, ndim, TY_DOUBLE)
call salloc (axes, IM_MAXDIM, TY_INT)
# Open the wcs.
mw = mw_open (NULL, ndim)
# Set the axes and projection type.
Memi[axes] = 1
Memi[axes+1] = 2
if (projection[1] == EOS)
call mw_swtype (mw, Memi[axes], ndim, "linear", "")
else {
call sscan (projection)
call gargwrd (Memc[projstr], SZ_FNAME)
call gargstr (Memc[projpars], SZ_LINE)
call sprintf (Memc[wpars], SZ_LINE,
"axis 1: axtype = ra %s axis 2: axtype = dec %s")
call pargstr (Memc[projpars])
call pargstr (Memc[projpars])
call mw_swtype (mw, Memi[axes], ndim, Memc[projstr], Memc[wpars])
}
# Set the lterm.
call mw_mkidmd (Memd[ltm], ndim)
call aclrd (Memd[ltv], ndim)
call mw_sltermd (mw, Memd[ltm], Memd[ltv], ndim)
# Set the wterm.
call mw_mkidmd (Memd[cd], ndim)
call aclrd (Memd[r], ndim)
switch (lngunits) {
case SKY_DEGREES:
Memd[w] = reflng
case SKY_RADIANS:
Memd[w] = RADTODEG(reflng)
case SKY_HOURS:
Memd[w] = 15.0d0 * reflng
default:
Memd[w] = reflng
}
switch (latunits) {
case SKY_DEGREES:
Memd[w+1] = reflat
case SKY_RADIANS:
Memd[w+1] = RADTODEG(reflat)
case SKY_HOURS:
Memd[w+1] = 15.0d0 * reflat
default:
Memd[w+1] = reflat
}
call mw_swtermd (mw, Memd[r], Memd[w], Memd[cd], ndim)
call sfree (sp)
return (mw)
end
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