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#{ TABOVERLAY -- Overlay a catalog of sources on an image display. The
# catalog is assumed to be a text file, the user supplies the columns
# defining the RA/Dec columns (and optional label). These will be
# converted to image coords based on the WCS of the image.
procedure taboverlay (image, catalog)
string image { prompt = "Input image" }
string catalog { prompt = "Input catalog" }
int labcol = 1 { prompt = "Label column" }
int racol = 2 { prompt = "RA column" }
int deccol = 3 { prompt = "Dec column" }
int mkcolor = 208 { prompt = "Marker color" }
int status = 0 { prompt = "Service status code" }
begin
string img, cat, coords, tvcoords, pos_all
real ra, dec, size
int mcol, c1, c2, c3
# Get params to local variables.
img = image
mcol = mkcolor
c1 = racol
c2 = deccol
c3 = labcol
cat = catalog
if (imaccess (img)) {
iferr { wcsinfo (img) } then {
error (0, "Cannot determine image coords for `"//img//"'")
} else {
ra = wcsinfo.midx
dec = wcsinfo.midy
size = max (wcsinfo.width, wcsinfo.height) / 60.0
}
} else {
#error (0, "Image '"// img // "' not found.")
sesame (img, verbose-)
ra = sesame.ra
dec = sesame.dec
img = "cache$" // img // ".fits"
}
# Create temp files for the output
coords = mktemp ("tmp$to")
tvcoords = mktemp ("tmp$to")
pos_all = mktemp ("tmp$to")
# Select the RA,Dec and optional columns from the table.
fields (cat, c1//","//c2//","//c3, >& pos_all)
# Mark the objects on the display.
wcsctran (pos_all, "c1", img, verb-,
inwcs="world", outwcs="logical", units="n n")
tvmark (frame=1, coords="c1", mark="circle", radii=10, color=mcol,
txsize=1, nxoffset=5, nyoffset=-10)
delete ("c1", verify-, >& "dev$null")
if (mkcolor > 217) # update the marker color
mkcolor = 204
else
mkcolor = mkcolor + 1
# Clean up.
delete (coords, verify-, >& "dev$null")
delete (pos_all, verify-, >& "dev$null")
delete (tvcoords, verify-, >& "dev$null")
end
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