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include <imhdr.h>
include <math.h>
include <mach.h>
include "../lib/apphotdef.h"
include "../lib/fitskydef.h"
include "../lib/fitsky.h"
# APSKYBUF -- Procedure to fetch the sky pixels given the pointer to the
# IRAF image, the coordinates of the center and the size of the apphot
# sky annulus.
int procedure apskybuf (ap, im, wx, wy)
pointer ap # pointer to apphot structure
pointer im # pointer to the IRAF image
real wx, wy # center coordinates
int lenbuf
pointer sky
real annulus, dannulus, datamin, datamax
int ap_skypix(), ap_bskypix()
begin
# Check for 0 radius annulus.
sky = AP_PSKY(ap)
annulus = AP_ANNULUS(sky) * AP_SCALE(ap)
dannulus = AP_DANNULUS(sky) * AP_SCALE(ap)
if (dannulus <= 0.0)
return (AP_NOSKYAREA)
# Allocate space for sky pixels.
lenbuf = PI * (2.0 * annulus + dannulus + 1.0) * (dannulus + 0.5)
if (lenbuf != AP_LENSKYBUF(sky)) {
if (AP_SKYPIX(sky) != NULL)
call mfree (AP_SKYPIX(sky), TY_REAL)
call malloc (AP_SKYPIX(sky), lenbuf, TY_REAL)
if (AP_COORDS(sky) != NULL)
call mfree (AP_COORDS(sky), TY_INT)
call malloc (AP_COORDS(sky), lenbuf, TY_INT)
if (AP_INDEX(sky) != NULL)
call mfree (AP_INDEX(sky), TY_INT)
call malloc (AP_INDEX(sky), lenbuf, TY_INT)
if (AP_SWGT(sky) != NULL)
call mfree (AP_SWGT(sky), TY_REAL)
call malloc (AP_SWGT(sky), lenbuf, TY_REAL)
AP_LENSKYBUF(sky) = lenbuf
}
# Fetch the sky pixels.
if (IS_INDEFR(AP_DATAMIN(ap)) && IS_INDEFR(AP_DATAMAX(ap))) {
AP_NSKYPIX(sky) = ap_skypix (im, wx, wy, annulus, (annulus +
dannulus), Memr[AP_SKYPIX(sky)], Memi[AP_COORDS(sky)],
AP_SXC(sky), AP_SYC(sky), AP_SNX(sky), AP_SNY(sky))
AP_NBADSKYPIX(sky) = 0
} else {
if (IS_INDEFR(AP_DATAMIN(ap)))
datamin = -MAX_REAL
else
datamin = AP_DATAMIN(ap)
if (IS_INDEFR(AP_DATAMAX(ap)))
datamax = MAX_REAL
else
datamax = AP_DATAMAX(ap)
AP_NSKYPIX(sky) = ap_bskypix (im, wx, wy, annulus, (annulus +
dannulus), datamin, datamax, Memr[AP_SKYPIX(sky)],
Memi[AP_COORDS(sky)], AP_SXC(sky), AP_SYC(sky), AP_SNX(sky),
AP_SNY(sky), AP_NBADSKYPIX(sky))
}
if (AP_NSKYPIX(sky) <= 0) {
if (AP_NBADSKYPIX(sky) <= 0)
return (AP_SKY_OUTOFBOUNDS)
else
return (AP_NSKY_TOO_SMALL)
} else
return (AP_OK)
end
# AP_SKYPIX -- Procedure to fetch the sky pixels from the image
int procedure ap_skypix (im, wx, wy, rin, rout, skypix, coords, xc, yc,
nx, ny)
pointer im # pointer to IRAF image
real wx, wy # center of sky annulus
real rin, rout # inner and outer radius of sky annulus
real skypix[ARB] # skypixels
int coords[ARB] # sky subraster coordinates [i + nx * (j - 1)]
real xc, yc # center of sky subraster
int nx, ny # max dimensions of sky subraster (output)
int i, j, ncols, nlines, c1, c2, l1, l2, nskypix
pointer buf
real xc1, xc2, xl1, xl2, rin2, rout2, rj2, r2
pointer imgs2r()
#pointer tbuf
begin
if (rout <= rin)
return (0)
# Test for out of bounds sky regions.
ncols = IM_LEN(im,1)
nlines = IM_LEN(im,2)
xc1 = wx - rout
xc2 = wx + rout
xl1 = wy - rout
xl2 = wy + rout
if (xc2 < 1.0 || xc1 > real (ncols) || xl2 < 1.0 || xl1 > real (nlines))
return (0)
# Compute the column and line limits.
c1 = max (1.0, min (real (ncols), wx - rout)) + 0.5
c2 = min (real (ncols), max (1.0, wx + rout)) + 0.5
l1 = max (1.0, min (real (nlines), wy - rout)) + 0.5
l2 = min (real (nlines), max (1.0, wy + rout)) + 0.5
nx = c2 - c1 + 1
ny = l2 - l1 + 1
xc = wx - c1 + 1
yc = wy - l1 + 1
# Fetch the sky pixels.
rin2 = rin ** 2
rout2 = rout ** 2
nskypix = 0
do j = l1, l2 {
buf = imgs2r (im, c1, c2, j, j)
rj2 = (wy - j) ** 2
do i = c1, c2 {
r2 = (wx - i) ** 2 + rj2
if (r2 > rin2 && r2 <= rout2) {
skypix[nskypix+1] = Memr[buf+i-c1]
coords[nskypix+1] = (i - c1 + 1) + nx * (j - l1)
nskypix = nskypix + 1
}
}
}
#buf = imgs2r (im, c1, c2, l1, l2)
#tbuf = buf
#do j = l1, l2 {
#rj2 = (wy - j) ** 2
#do i = c1, c2 {
#r2 = (wx - i) ** 2 + rj2
#if (r2 > rin2 && r2 <= rout2) {
#skypix[nskypix+1] = Memr[tbuf+i-c1]
#coords[nskypix+1] = (i - c1 + 1) + nx * (j - l1)
#nskypix = nskypix + 1
#}
#}
#tbuf = tbuf + nx
#}
return (nskypix)
end
# AP_BSKYPIX -- Procedure to fetch the sky pixels from the image
int procedure ap_bskypix (im, wx, wy, rin, rout, datamin, datamax,
skypix, coords, xc, yc, nx, ny, nbad)
pointer im # pointer to IRAF image
real wx, wy # center of sky annulus
real rin, rout # inner and outer radius of sky annulus
real datamin # minimum good value
real datamax # maximum good value
real skypix[ARB] # skypixels
int coords[ARB] # sky subraster coordinates [i + nx * (j - 1)]
real xc, yc # center of sky subraster
int nx, ny # max dimensions of sky subraster (output)
int nbad # number of bad pixels
int i, j, ncols, nlines, c1, c2, l1, l2, nskypix
pointer buf
real xc1, xc2, xl1, xl2, rin2, rout2, rj2, r2, pixval
pointer imgs2r()
#pointer tbuf
begin
if (rout <= rin)
return (0)
# Test for out of bounds sky regions.
ncols = IM_LEN(im,1)
nlines = IM_LEN(im,2)
xc1 = wx - rout
xc2 = wx + rout
xl1 = wy - rout
xl2 = wy + rout
if (xc2 < 1.0 || xc1 > real (ncols) || xl2 < 1.0 || xl1 > real (nlines))
return (0)
# Compute the column and line limits.
c1 = max (1.0, min (real (ncols), wx - rout)) + 0.5
c2 = min (real (ncols), max (1.0, wx + rout)) + 0.5
l1 = max (1.0, min (real (nlines), wy - rout)) + 0.5
l2 = min (real (nlines), max (1.0, wy + rout)) + 0.5
nx = c2 - c1 + 1
ny = l2 - l1 + 1
xc = wx - c1 + 1
yc = wy - l1 + 1
rin2 = rin ** 2
rout2 = rout ** 2
nskypix = 0
nbad = 0
# Fetch the sky pixels.
do j = l1, l2 {
buf = imgs2r (im, c1, c2, j, j)
rj2 = (wy - j) ** 2
do i = c1, c2 {
r2 = (wx - i) ** 2 + rj2
if (r2 > rin2 && r2 <= rout2) {
pixval = Memr[buf+i-c1]
if (pixval < datamin || pixval > datamax)
nbad = nbad + 1
else {
skypix[nskypix+1] = pixval
coords[nskypix+1] = (i - c1 + 1) + nx * (j - l1)
nskypix = nskypix + 1
}
}
}
}
#buf = imgs2r (im, c1, c2, l1, l2)
#tbuf = buf
#do j = l1, l2 {
#rj2 = (wy - j) ** 2
#do i = c1, c2 {
#r2 = (wx - i) ** 2 + rj2
#if (r2 > rin2 && r2 <= rout2) {
#pixval = Memr[tbuf+i-c1]
#if (pixval < datamin || pixval > datamax)
#nbad = nbad + 1
#else {
#skypix[nskypix+1] = pixval
#coords[nskypix+1] = (i - c1 + 1) + nx * (j - l1)
#nskypix = nskypix + 1
#}
#}
#}
#tbuf = tbuf + nx
#}
return (nskypix)
end
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