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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## Display an octave image matrix.
##
## image (x) displays a matrix as a color image. The elements of x are
## indices into the current colormap and should have values between 1
## and the length of the colormap.
##
## image (x, zoom) changes the zoom factor. The default value is 4.
##
## SEE ALSO: imshow, imagesc, colormap.
## Author: Tony Richardson <arichard@stark.cc.oh.us>
## Created: July 1994
## Adapted-By: jwe
function image (x, zoom)
if (nargin == 0)
## Load Bobbie Jo Richardson (Born 3/16/94)
x = loadimage ("default.img");
zoom = 2;
elseif (nargin == 1)
zoom = 4;
elseif (nargin > 2)
usage ("image (matrix, [zoom])");
endif
ppm_name = tmpnam ();
saveimage (ppm_name, x, "ppm");
## Start the viewer. Try xv, then xloadimage.
xv = sprintf ("xv -expand %f %s", zoom, ppm_name);
xloadimage = sprintf ("xloadimage -zoom %f %s", zoom*100, ppm_name);
rm = sprintf ("rm -f %s", ppm_name);
## Need to let the shell clean up the tmp file because we are putting
## the viewer in the background.
command = sprintf ("( %s || %s && %s ) > /dev/null 2>&1 &",
xv, xloadimage, rm);
system (command);
endfunction
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