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|
include <imhdr.h>
include <math.h>
include <mwset.h>
include <pkg/skywcs.h>
# Define the possible pixel types
define CC_PIXTYPESTR "|logical|physical|"
define CC_LOGICAL 1
define CC_PHYSICAL 2
# T_CCSETWCS -- Create a wcs and write it to the image header. The wcs may
# be read from a database file written by CCMAP or it may be input by the
# user.
procedure t_ccsetwcs ()
bool transpose, verbose, update
double xref, yref, xscale, yscale, xrot, yrot, lngref, latref
double txref, tyref, txscale, tyscale, txrot, tyrot, tlngref, tlatref
int imlist, reclist, lngunits, latunits, coostat, recstat, proj, pixsys, pfd
pointer sp, image, database, record, insystem, projstr, str
pointer dt, im, coo, tcoo, mw, sx1, sy1, sx2, sy2
bool clgetb()
double clgetd()
int imtopenp(), clgwrd(), sk_decwcs(), sk_stati(), imtlen()
int imtgetim(), cc_dtwcs(), strdic(), cc_rdproj(), open()
pointer dtmap(), immap()
errchk open()
begin
# Allocate some working space.
call smark (sp)
call salloc (image, SZ_FNAME, TY_CHAR)
call salloc (database, SZ_FNAME, TY_CHAR)
call salloc (record, SZ_FNAME, TY_CHAR)
call salloc (insystem, SZ_FNAME, TY_CHAR)
call salloc (projstr, SZ_LINE, TY_CHAR)
call salloc (str, SZ_LINE, TY_CHAR)
imlist = imtopenp ("images")
call clgstr ("database", Memc[database], SZ_FNAME)
# Fetch the celestial coordinate system parameters.
if (Memc[database] == EOS) {
dt = NULL
reclist = NULL
xref = clgetd ("xref")
yref = clgetd ("yref")
xscale = clgetd ("xmag")
yscale = clgetd ("ymag")
xrot = clgetd ("xrotation")
yrot = clgetd ("yrotation")
lngref = clgetd ("lngref")
latref = clgetd ("latref")
iferr (lngunits = clgwrd ("lngunits", Memc[str], SZ_FNAME,
SKY_LNG_UNITLIST))
lngunits = 0
iferr (latunits = clgwrd ("latunits", Memc[str], SZ_FNAME,
SKY_LAT_UNITLIST))
latunits = 0
call clgstr ("coosystem", Memc[insystem], SZ_FNAME)
coostat = sk_decwcs (Memc[insystem], mw, coo, NULL)
if (coostat == ERR || mw != NULL) {
call eprintf ("Error decoding the coordinate system %s\n")
call pargstr (Memc[insystem])
if (mw != NULL)
call mw_close (mw)
if (coo != NULL)
#call mfree (coo, TY_STRUCT)
call sk_close (coo)
call imtclose (imlist)
call sfree (sp)
return
}
if (lngunits <= 0)
lngunits = sk_stati (coo, S_NLNGUNITS)
call sk_seti (coo, S_NLNGUNITS, lngunits)
if (latunits <= 0)
latunits = sk_stati (coo, S_NLATUNITS)
call sk_seti (coo, S_NLATUNITS, latunits)
call clgstr ("projection", Memc[projstr], SZ_LINE)
iferr {
pfd = open (Memc[projstr], READ_ONLY, TEXT_FILE)
} then {
proj = strdic (Memc[projstr], Memc[projstr], SZ_LINE,
WTYPE_LIST)
if (proj <= 0 || proj == WTYPE_LIN)
Memc[projstr] = EOS
} else {
proj = cc_rdproj (pfd, Memc[projstr], SZ_LINE)
call close (pfd)
}
iferr (pixsys = clgwrd ("pixsystem", Memc[str], SZ_FNAME,
CC_PIXTYPESTR))
pixsys = PIXTYPE_LOGICAL
else if (pixsys == CC_PHYSICAL)
pixsys = PIXTYPE_PHYSICAL
else
pixsys = PIXTYPE_LOGICAL
call sk_seti (coo, S_PIXTYPE, pixsys)
} else {
dt = dtmap (Memc[database], READ_ONLY)
reclist = imtopenp ("solutions")
if ((imtlen (reclist) > 1) && (imtlen (imlist) !=
imtlen (reclist))) {
call eprintf (
" The image and record list lengths are different\n")
call imtclose (reclist)
call dtunmap (dt)
call imtclose (imlist)
call sfree (sp)
return
}
coo = NULL
}
transpose = clgetb ("transpose")
verbose = clgetb ("verbose")
update = clgetb ("update")
# Loop over the images.
while (imtgetim (imlist, Memc[image], SZ_FNAME) != EOF) {
if (update)
im = immap (Memc[image], READ_WRITE, 0)
else
im = immap (Memc[image], READ_ONLY, 0)
if (IM_NDIM(im) != 2) {
call printf ("Skipping non 2D image %s\n")
call pargstr (Memc[image])
call imunmap (im)
next
}
if (dt == NULL) {
if (verbose) {
call printf ("Image: %s\n")
call pargstr (Memc[image])
}
# Compute the linear transformation parameters.
if (IS_INDEFD(lngref))
tlngref = 0.0d0
else
tlngref = lngref
if (IS_INDEFD(latref))
tlatref = 0.0d0
else
tlatref = latref
if (IS_INDEFD(xref))
txref = (1.0d0 + IM_LEN(im,1)) / 2.0
else
txref = xref
if (IS_INDEFD(yref))
tyref = (1.0d0 + IM_LEN(im,2)) / 2.0
else
tyref = yref
if (IS_INDEFD(xscale))
txscale = 1.0d0
else
txscale = xscale
if (IS_INDEFD(yscale))
tyscale = 1.0d0
else
tyscale = yscale
if (IS_INDEFD(xrot))
txrot = 0.0d0
else
txrot = xrot
if (IS_INDEFD(yrot))
tyrot = 0.0d0
else
tyrot = yrot
if (verbose)
call cc_usershow (coo, Memc[projstr], tlngref, tlatref,
txref, tyref, txscale, tyscale, txrot, tyrot,
transpose)
if (update) {
call cc_userwcs (im, coo, Memc[projstr], tlngref, tlatref,
txref, tyref, txscale, tyscale, txrot, tyrot,
transpose)
if (verbose)
call printf ("Updating image header wcs\n")
}
} else {
if (imtgetim (reclist, Memc[record], SZ_FNAME) == EOF)
#call strcpy (Memc[image], Memc[record], SZ_FNAME)
;
if (verbose) {
call printf ("Image: %s Database: %s Solution: %d\n")
call pargstr (Memc[image])
call pargstr (Memc[database])
call pargstr (Memc[record])
}
sx1 = NULL; sx2 = NULL
sy1 = NULL; sy2 = NULL
tcoo = NULL
recstat = cc_dtwcs (dt, Memc[record], tcoo, Memc[projstr],
tlngref, tlatref, sx1, sy1, sx2, sy2, txref, tyref, txscale,
tyscale, txrot, tyrot)
if (recstat == ERR) {
call printf (" Cannot find or decode ")
call printf ("record %s in database file %s\n")
call pargstr (Memc[record])
call pargstr (Memc[database])
} else {
call sscan (Memc[projstr])
call gargwrd (Memc[str], SZ_FNAME)
proj = strdic (Memc[str], Memc[str], SZ_FNAME,
WTYPE_LIST)
if (proj <= 0 || proj == WTYPE_LIN)
Memc[projstr] = EOS
if (verbose)
call cc_usershow (tcoo, Memc[projstr], tlngref,
tlatref, txref, tyref, txscale, tyscale, txrot,
tyrot, transpose)
if (update) {
call cc_nwcsim (im, tcoo, Memc[projstr], tlngref,
tlatref, sx1, sy1, sx2, sy2, transpose)
if (verbose)
call printf ("Updating image header wcs\n")
}
}
if (tcoo != NULL)
#call mfree (tcoo, TY_STRUCT)
call sk_close (tcoo)
if (sx1 != NULL)
call dgsfree (sx1)
if (sy1 != NULL)
call dgsfree (sy1)
}
call imunmap (im)
}
# Close up memory.
if (coo != NULL)
#call mfree (coo, TY_STRUCT)
call sk_close (coo)
if (dt != NULL)
call dtunmap (dt)
if (reclist != NULL)
call imtclose (reclist)
call imtclose (imlist)
call sfree (sp)
end
define NEWCD Memd[ncd+(($2)-1)*ndim+($1)-1]
# CC_USERWCS -- Compute the image wcs from the user parameters.
procedure cc_userwcs (im, coo, projection, lngref, latref, xref, yref,
xscale, yscale, xrot, yrot, transpose)
pointer im #I pointer to the input image
pointer coo #I pointer to the coordinate structure
char projection[ARB] #I the sky projection geometry
double lngref, latref #I the world coordinates of the reference point
double xref, yref #I the reference point in pixels
double xscale, yscale #I the x and y scale in arcsec / pixel
double xrot, yrot #I the x and y axis rotation angles in degrees
bool transpose #I transpose the wcs
double tlngref, tlatref
int l, i, ndim, naxes, axmap, wtype, ax1, ax2, szatstr
pointer mw, sp, r, w, cd, ltm, ltv, iltm, nr, ncd, axes, axno, axval
pointer projstr, projpars, wpars, mwnew, atstr
int mw_stati(), sk_stati(), strdic(), strlen(), itoc()
pointer mw_openim(), mw_open()
errchk mw_newsystem(), mw_gwattrs()
begin
mw = mw_openim (im)
ndim = mw_stati (mw, MW_NPHYSDIM)
# Allocate working memory for the vectors and matrices.
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 (r, ndim, TY_DOUBLE)
call salloc (w, ndim, TY_DOUBLE)
call salloc (cd, ndim * ndim, TY_DOUBLE)
call salloc (ltm, ndim * ndim, TY_DOUBLE)
call salloc (ltv, ndim, TY_DOUBLE)
call salloc (iltm, ndim * ndim, TY_DOUBLE)
call salloc (nr, ndim, TY_DOUBLE)
call salloc (ncd, ndim * ndim, TY_DOUBLE)
call salloc (axes, IM_MAXDIM, TY_INT)
call salloc (axno, IM_MAXDIM, TY_INT)
call salloc (axval, IM_MAXDIM, TY_INT)
# Open the new wcs
mwnew = mw_open (NULL, ndim)
call mw_gsystem (mw, Memc[projstr], SZ_FNAME)
iferr {
call mw_newsystem (mw, "image", ndim)
} then {
call mw_newsystem (mwnew, Memc[projstr], ndim)
} else {
call mw_newsystem (mwnew, "image", ndim)
}
# Set the LTERM.
call mw_gltermd (mw, Memd[ltm], Memd[ltv], ndim)
call mw_sltermd (mwnew, Memd[ltm], Memd[ltv], ndim)
# Store the old axis map for later use.
call mw_gaxmap (mw, Memi[axno], Memi[axval], ndim)
# Get the 2 logical axes.
call mw_gaxlist (mw, 03B, Memi[axes], naxes)
axmap = mw_stati (mw, MW_USEAXMAP)
ax1 = Memi[axes]
ax2 = Memi[axes+1]
# Set the axes and projection type.
if (projection[1] == EOS) {
call mw_swtype (mwnew, 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 (mwnew, Memi[axes], ndim, Memc[projstr], Memc[wpars])
}
# Copy in the atrributes of the other axes.
szatstr = SZ_LINE
call malloc (atstr, szatstr, TY_CHAR)
do l = 1, ndim {
if (l == ax1 || l == ax2)
next
iferr {
call mw_gwattrs (mw, l, "wtype", Memc[projpars], SZ_LINE)
} then {
call mw_swtype (mwnew, l, 1, "linear", "")
} else {
call mw_swtype (mwnew, l, 1, Memc[projpars], "")
}
for (i = 1; ; i = i + 1) {
if (itoc (i, Memc[projpars], SZ_LINE) <= 0)
Memc[atstr] = EOS
repeat {
iferr (call mw_gwattrs (mw, l, Memc[projpars],
Memc[atstr], szatstr))
Memc[atstr] = EOS
if (strlen (Memc[atstr]) < szatstr)
break
szatstr = szatstr + SZ_LINE
call realloc (atstr, szatstr, TY_CHAR)
}
if (Memc[atstr] == EOS)
break
call mw_swattrs (mwnew, 1, Memc[projpars], Memc[atstr])
}
}
call mfree (atstr, TY_CHAR)
# Compute the referemce point world coordinates.
switch (sk_stati(coo, S_NLNGUNITS)) {
case SKY_DEGREES:
tlngref = lngref
case SKY_RADIANS:
tlngref = RADTODEG(lngref)
case SKY_HOURS:
tlngref = 15.0d0 * lngref
default:
tlngref = lngref
}
switch (sk_stati(coo, S_NLATUNITS)) {
case SKY_DEGREES:
tlatref = latref
case SKY_RADIANS:
tlatref = RADTODEG(latref)
case SKY_HOURS:
tlatref = 15.0d0 * latref
default:
tlatref = latref
}
if (! transpose) {
Memd[w+ax1-1] = tlngref
Memd[w+ax2-1] = tlatref
} else {
Memd[w+ax2-1] = tlngref
Memd[w+ax1-1] = tlatref
}
# Compute the reference point pixel coordinates.
Memd[nr+ax1-1] = xref
Memd[nr+ax2-1] = yref
# Compute the new CD matrix.
if (! transpose) {
NEWCD(ax1,ax1) = xscale * cos (DEGTORAD(xrot)) / 3600.0d0
NEWCD(ax2,ax1) = -yscale * sin (DEGTORAD(yrot)) / 3600.0d0
NEWCD(ax1,ax2) = xscale * sin (DEGTORAD(xrot)) / 3600.0d0
NEWCD(ax2,ax2) = yscale * cos (DEGTORAD(yrot)) / 3600.0d0
} else {
NEWCD(ax1,ax1) = xscale * sin (DEGTORAD(xrot)) / 3600.0d0
NEWCD(ax2,ax1) = yscale * cos (DEGTORAD(yrot)) / 3600.0d0
NEWCD(ax1,ax2) = xscale * cos (DEGTORAD(xrot)) / 3600.0d0
NEWCD(ax2,ax2) = -yscale * sin (DEGTORAD(yrot)) / 3600.0d0
}
# Reset the axis map.
call mw_seti (mw, MW_USEAXMAP, axmap)
# Recompute and store the new wcs if update is enabled.
call mw_saxmap (mwnew, Memi[axno], Memi[axval], ndim)
if (sk_stati (coo, S_PIXTYPE) == PIXTYPE_PHYSICAL) {
call mw_swtermd (mwnew, Memd[nr], Memd[w], Memd[ncd], ndim)
} else {
call mwmmuld (Memd[ncd], Memd[ltm], Memd[cd], ndim)
call mwinvertd (Memd[ltm], Memd[iltm], ndim)
call asubd (Memd[nr], Memd[ltv], Memd[r], ndim)
call mwvmuld (Memd[iltm], Memd[r], Memd[nr], ndim)
call mw_swtermd (mwnew, Memd[nr], Memd[w], Memd[cd], ndim)
}
# Save the fit.
if (! transpose) {
call sk_seti (coo, S_PLNGAX, ax1)
call sk_seti (coo, S_PLATAX, ax2)
} else {
call sk_seti (coo, S_PLNGAX, ax2)
call sk_seti (coo, S_PLATAX, ax1)
}
call sk_saveim (coo, mwnew, im)
call mw_saveim (mwnew, im)
call mw_close (mwnew)
call mw_close (mw)
# Force the CDELT keywords to update. This will be unecessary when
# mwcs is updated to deal with non-quoted and / or non left-justified
# CTYPE keywords..
wtype = strdic (Memc[projstr], Memc[projstr], SZ_FNAME, WTYPE_LIST)
if (wtype > 0)
call sk_seti (coo, S_WTYPE, wtype)
call sk_ctypeim (coo, im)
# Reset the fit. This will be unecessary when wcs is updated to deal
# with non-quoted and / or non left-justified CTYPE keywords.
call sk_seti (coo, S_WTYPE, 0)
call sk_seti (coo, S_PLNGAX, 0)
call sk_seti (coo, S_PLATAX, 0)
call sfree (sp)
end
# CC_USERSHOW -- Print the image wcs parameters in user friendly format.
procedure cc_usershow (coo, projection, lngref, latref, xref, yref, xscale,
yscale, xrot, yrot, transpose)
pointer coo #I pointer to the coordinate structure
char projection[ARB] #I the sky projection geometry
double lngref, latref #I the world coordinates of the reference point
double xref, yref #I the reference point in pixels
double xscale, yscale #I the x and y scale in arcsec / pixel
double xrot, yrot #I the x and y axis rotation angles in degrees
bool transpose #I transpose the wcs
pointer sp, str, keyword, value
int sk_stati()
begin
# Allocate temporary space.
call smark (sp)
call salloc (str, SZ_LINE, TY_CHAR)
call salloc (keyword, SZ_FNAME, TY_CHAR)
call salloc (value, SZ_FNAME, TY_CHAR)
call printf ("Coordinate mapping parameters\n")
call printf (" Sky projection geometry: %s\n")
if (projection[1] == EOS)
call pargstr ("lin")
else {
call sscan (projection)
call gargwrd (Memc[str], SZ_LINE)
call pargstr (Memc[str])
repeat {
call gargwrd (Memc[keyword], SZ_FNAME)
if (Memc[keyword] == EOS)
break
call gargwrd (Memc[value], SZ_FNAME)
if (Memc[value] != '=')
break
call gargwrd (Memc[value], SZ_FNAME)
if (Memc[value] == EOS)
break
call printf (" Projection parameter %s: %s\n")
call pargstr (Memc[keyword])
call pargstr (Memc[value])
}
}
# Output the reference point.
call sprintf (Memc[str], SZ_LINE,
" Reference point: %s %s (%s %s)\n")
switch (sk_stati (coo, S_NLNGUNITS)) {
case SKY_DEGREES:
call pargstr ("%0.2h")
case SKY_RADIANS:
call pargstr ("%0.7g")
case SKY_HOURS:
call pargstr ("%0.3h")
}
switch (sk_stati (coo, S_NLATUNITS)) {
case SKY_DEGREES:
call pargstr ("%0.2h")
case SKY_RADIANS:
call pargstr ("%0.7g")
case SKY_HOURS:
call pargstr ("%0.3h")
}
switch (sk_stati (coo, S_NLNGUNITS)) {
case SKY_DEGREES:
call pargstr ("degrees")
case SKY_RADIANS:
call pargstr ("radians")
case SKY_HOURS:
call pargstr ("hours")
}
switch (sk_stati (coo, S_NLATUNITS)) {
case SKY_DEGREES:
call pargstr ("degrees")
case SKY_RADIANS:
call pargstr ("radians")
case SKY_HOURS:
call pargstr ("hours")
}
call printf (Memc[str])
call pargd (lngref)
call pargd (latref)
# Output the logical axes.
if (sk_stati (coo, S_CTYPE) == CTYPE_EQUATORIAL)
call printf (" Ra/Dec logical image axes: %d %d\n")
else
call printf (" Long/Lat logical image axes: %d %d\n")
if (! transpose) {
call pargi (1)
call pargi (2)
} else {
call pargi (2)
call pargi (1)
}
# Output the reference point in pixels.
call printf (" Reference point: %0.3f %0.3f (pixels pixels)\n")
call pargd (xref)
call pargd (yref)
# Output the scale factors.
call printf (
" X and Y scale: %0.3f %0.3f (arcsec/pixel arcsec/pixel)\n")
call pargd (xscale)
call pargd (yscale)
# Output the rotation angles.
call printf (
" X and Y coordinate rotation: %0.3f %0.3f (degrees degrees)\n")
call pargd (xrot)
call pargd (yrot)
call sfree (sp)
end
# CC_DTWCS -- Read the wcs from the database records written by CCMAP.
int procedure cc_dtwcs (dt, record, coo, projection, lngref, latref, sx1, sy1,
sx2, sy2, xref, yref, xscale, yscale, xrot, yrot)
pointer dt #I pointer to the database
char record[ARB] #I the database records to be read
pointer coo #O pointer to the coordinate structure
char projection[ARB] #O the sky projection geometry
double lngref, latref #O the reference point world coordinates
pointer sx1, sy1 #O pointer to the linear x and y fits
pointer sx2, sy2 #O pointer to the distortion x and y fits
double xref, yref #O the reference point in pixels
double xscale, yscale #O the x and y scale factors
double xrot, yrot #O the x and y axis rotation angles
int i, op, ncoeff, junk, rec, coostat, lngunits, latunits, pixsys
double xshift, yshift, a, b, c, d, denom
pointer sp, xcoeff, ycoeff, nxcoeff, nycoeff, mw, projpar, projvalue
bool fp_equald()
double dtgetd()
int dtlocate(), dtgeti(), dtscan(), sk_decwcs(), strdic(), strlen()
int gstrcpy()
errchk dtgstr(), dtgetd(), dtgeti(), dgsrestore()
begin
# Locate the appropriate records.
iferr (rec = dtlocate (dt, record))
return (ERR)
# Open the coordinate structure.
iferr (call dtgstr (dt, rec, "coosystem", projection, SZ_FNAME))
return (ERR)
coostat = sk_decwcs (projection, mw, coo, NULL)
if (coostat == ERR || mw != NULL) {
if (mw != NULL)
call mw_close (mw)
projection[1] = EOS
return (ERR)
}
# Get the pixel coordinate system.
iferr (call dtgstr (dt, rec, "pixsystem", projection, SZ_FNAME)) {
pixsys = PIXTYPE_LOGICAL
} else {
pixsys = strdic (projection, projection, SZ_FNAME, PIXTYPE_LIST)
if (pixsys != PIXTYPE_PHYSICAL)
pixsys = PIXTYPE_LOGICAL
}
call sk_seti (coo, S_PIXTYPE, pixsys)
# Get the reference point units.
iferr (call dtgstr (dt, rec, "lngunits", projection, SZ_FNAME))
return (ERR)
lngunits = strdic (projection, projection, SZ_FNAME, SKY_LNG_UNITLIST)
if (lngunits > 0)
call sk_seti (coo, S_NLNGUNITS, lngunits)
iferr (call dtgstr (dt, rec, "latunits", projection, SZ_FNAME))
return (ERR)
latunits = strdic (projection, projection, SZ_FNAME, SKY_LAT_UNITLIST)
if (latunits > 0)
call sk_seti (coo, S_NLATUNITS, latunits)
# Get the reference point.
iferr (call dtgstr (dt, rec, "projection", projection, SZ_FNAME))
return (ERR)
iferr (lngref = dtgetd (dt, rec, "lngref"))
return (ERR)
iferr (latref = dtgetd (dt, rec, "latref"))
return (ERR)
# Read in the coefficients.
iferr (ncoeff = dtgeti (dt, rec, "surface1"))
return (ERR)
call smark (sp)
call salloc (xcoeff, ncoeff, TY_DOUBLE)
call salloc (ycoeff, ncoeff, TY_DOUBLE)
do i = 1, ncoeff {
junk = dtscan(dt)
call gargd (Memd[xcoeff+i-1])
call gargd (Memd[ycoeff+i-1])
}
# Restore the linear part of the fit.
call dgsrestore (sx1, Memd[xcoeff])
call dgsrestore (sy1, Memd[ycoeff])
# Get and restore the distortion part of the fit.
ncoeff = dtgeti (dt, rec, "surface2")
if (ncoeff > 0) {
call salloc (nxcoeff, ncoeff, TY_DOUBLE)
call salloc (nycoeff, ncoeff, TY_DOUBLE)
do i = 1, ncoeff {
junk = dtscan(dt)
call gargd (Memd[nxcoeff+i-1])
call gargd (Memd[nycoeff+i-1])
}
iferr {
call dgsrestore (sx2, Memd[nxcoeff])
} then {
call mfree (sx2, TY_STRUCT)
sx2 = NULL
}
iferr {
call dgsrestore (sy2, Memd[nycoeff])
} then {
call mfree (sy2, TY_STRUCT)
sy2 = NULL
}
} else {
sx2 = NULL
sy2 = NULL
}
# Compute the coefficients.
call geo_gcoeffd (sx1, sy1, xshift, yshift, a, b, c, d)
# Compute the reference point.
denom = a * d - c * b
if (denom == 0.0d0)
xref = INDEFD
else
xref = (b * yshift - d * xshift) / denom
if (denom == 0.0d0)
yref = INDEFD
else
yref = (c * xshift - a * yshift) / denom
# Compute the scale factors.
xscale = sqrt (a * a + c * c)
yscale = sqrt (b * b + d * d)
# Compute the rotation angles.
if (fp_equald (a, 0.0d0) && fp_equald (c, 0.0d0))
xrot = 0.0d0
else
xrot = RADTODEG (atan2 (-c, a))
if (xrot < 0.0d0)
xrot = xrot + 360.0d0
if (fp_equald (b, 0.0d0) && fp_equald (d, 0.0d0))
yrot = 0.0d0
else
yrot = RADTODEG (atan2 (b, d))
if (yrot < 0.0d0)
yrot = yrot + 360.0d0
# Read in up to 10 projection parameters.
call salloc (projpar, SZ_FNAME, TY_CHAR)
call salloc (projvalue, SZ_FNAME, TY_CHAR)
op = strlen (projection) + 1
do i = 0, 9 {
call sprintf (Memc[projpar], SZ_FNAME, "projp%d")
call pargi (i)
iferr (call dtgstr (dt, rec, Memc[projpar], Memc[projvalue],
SZ_FNAME))
next
op = op + gstrcpy (" ", projection[op], SZ_LINE - op + 1)
op = op + gstrcpy (Memc[projpar], projection[op],
SZ_LINE - op + 1)
op = op + gstrcpy (" = ", projection[op], SZ_LINE - op + 1)
op = op + gstrcpy (Memc[projvalue], projection[op],
SZ_LINE - op + 1)
}
call sfree (sp)
return (OK)
end
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