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1996-09-28
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# Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function image (x, zoom)
# 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.
# Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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
# XXX FIXME XXX -- we should use octave_tmp_file_name.
rnd_str = num2str (fix (rand * 10000));
ppm_name = ["image.", rnd_str, ".ppm" ];
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);
command = sprintf ("( %s || %s && %s ) > /dev/null 2>&1 &", ...
xv, xloadimage, rm);
system (command);
endfunction