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include <smw.h>
# Evaluate SMW coordinate transform. These procedures call the
# MWCS procedures unless the WCS is a split MULTISPEC WCS. In that
# case the appropriate piece needs to be determined and the physical
# line numbers manipulated. For log sampled spectra conversions
# must be made for EQUISPEC/NDSPEC. The convention is that coordinates
# are always input and output and linear. Note that the MULTISPEC
# function driver already takes care of this.
#
# SMW_CTRANR -- N dimensional real coordinate transformation.
# SMW_CTRAND -- N dimensional double coordinate transformation.
# SMW_C1TRANR -- One dimensional real coordinate transformation.
# SMW_C1TRAND -- One dimensional double coordinate transformation.
# SMW_C2TRANR -- Two dimensional real coordinate transformation.
# SMW_C2TRAND -- Two dimensional double coordinate transformation.
$for (rd)
# SMW_CTRAN -- N dimensional coordinate transformation.
procedure smw_ctran$t (ct, p1, p2, ndim)
pointer ct #I SMW CT pointer
PIXEL p1[ndim] #I Input coordinate
PIXEL p2[ndim] #O Output coordinate
int ndim #I Dimensionality
int i, j, format, daxis, aaxis, dtype, naps
pointer smw, aps
errchk mw_ctran$t
begin
if (SMW_NCT(ct) != 1)
call error (1, "SMW_CTRAN: Wrong WCS type")
call amov$t (p1, p2, ndim)
smw = SMW_SMW(ct)
format = SMW_FORMAT(smw)
daxis = SMW_DAXIS(ct)
aaxis = SMW_AAXIS(ct)
dtype = SMW_DTYPE(smw)
naps = SMW_NSPEC(smw)
aps = SMW_APS(smw)
switch (format) {
case SMW_ND, SMW_ES:
switch (SMW_CTTYPE(ct)) {
case SMW_LW, SMW_PW:
call mw_ctran$t (SMW_CT(ct,0), p2, p2, ndim)
if (daxis > 0 && dtype == DCLOG)
p2[daxis] = 10. ** max (-20$F, min (20$F, p2[daxis]))
if (aaxis > 0 && format == SMW_ES) {
i = max (1, min (naps, nint (p2[aaxis])))
p2[aaxis] = Memi[aps+i-1]
}
case SMW_WL, SMW_WP:
if (daxis > 0 && dtype == DCLOG)
p2[daxis] = log10 (p2[daxis])
if (aaxis > 0 && format == SMW_ES) {
j = nint (p2[aaxis])
p2[aaxis] = 1
do i = 1, naps {
if (j == Memi[aps+i-1]) {
p2[aaxis] = i
break
}
}
}
call mw_ctran$t (SMW_CT(ct,0), p2, p2, ndim)
default:
call mw_ctran$t (SMW_CT(ct,0), p2, p2, ndim)
}
case SMW_MS:
call mw_ctran$t (SMW_CT(ct,0), p1, p2, ndim)
}
end
# SMW_C1TRAN -- One dimensional coordinate transformation.
PIXEL procedure smw_c1tran$t (ct, x1)
pointer ct #I SMW CT pointer
PIXEL x1 #I Input coordinate
PIXEL x2 #O Output coordinate
errchk mw_ctran$t
begin
call smw_ctran$t (ct, x1, x2, 1)
return (x2)
end
# SMW_C2TRAN -- Two dimensional coordinate transformation.
procedure smw_c2tran$t (ct, x1, y1, x2, y2)
pointer ct #I SMW CT pointer
PIXEL x1, y1 #I Input coordinates
PIXEL x2, y2 #O Output coordinates
PIXEL p1[2], p2[2]
int i, j, naps
PIXEL xp, yp
pointer aps, smw_ct()
errchk smw_ct, mw_c2tran$t
begin
# Unsplit WCS.
if (SMW_NCT(ct) == 1) {
p1[1] = x1
p1[2] = y1
call smw_ctran$t (ct, p1, p2, 2)
x2 = p2[1]
y2 = p2[2]
return
}
# If we get here then we are dealing with a split MULTISPEC WCS.
# Depending on the systems being transformed there may need to
# transformation made on the physical coordinate system.
switch (SMW_CTTYPE(ct)) {
case SMW_LW:
call mw_c2tran$t (SMW_CTL(ct), x1, y1, xp, yp)
i = nint (yp)
yp = mod (i-1, SMW_NSPLIT) + 1
call mw_c2tran$t (smw_ct(ct,i), xp, yp, x2, y2)
case SMW_PW:
i = nint (y1)
yp = mod (i-1, SMW_NSPLIT) + 1
call mw_c2tran$t (smw_ct(ct,i), x1, yp, x2, y2)
case SMW_WL:
aps = SMW_APS(SMW_SMW(ct))
naps = SMW_NSPEC(SMW_SMW(ct))
j = nint (y1)
do i = 1, naps {
if (Memi[aps+i-1] == j) {
call mw_c2tran$t (smw_ct(ct,i), x1, y1, xp, yp)
yp = i
call mw_c2tran$t (SMW_CTL(ct), xp, yp, x2, y2)
return
}
}
call error (1, "Aperture not found")
case SMW_WP:
aps = SMW_APS(SMW_SMW(ct))
naps = SMW_NSPEC(SMW_SMW(ct))
j = nint (y1)
do i = 1, naps {
if (Memi[aps+i-1] == j) {
call mw_c2tran$t (smw_ct(ct,i), x1, y1, x2, y2)
y2 = i
return
}
}
call error (1, "Aperture not found")
default:
x2 = x1
y2 = y1
}
end
$endfor
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