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#! /bin/sh
#
# $ Id: image2ascii,v 1.6 2002/12/01 12:36:56 roland Exp roland $
#
# Convert any image to an ASCII-graphic using ImageMagick
#
##########################################################################
#
# Copyright (C) 1997-2002 Roland Rosenfeld <roland@spinnaker.de>
#
# This program 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 of
# the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
##########################################################################
CONVERT=convert # The ImageMagick convert binary
PBMTOASCII=pbmtoascii # The NetPBM pbmtoascii binary
umask 077
tmpdir=${TMPDIR-/tmp}/image2ascii.$$
mkdir $tmpdir || exit 1
trap "rm -rf $tmpdir; exit" 0 1 2 3 15
TMPFILE=$tmpdir/image
usage="Usage: $0 [option] [imagefile]
-help display this help text
-geometry 132x50 define the size of the ascii image"
# set default geometry to display width:
geometry=`stty size </dev/tty | awk '{print $2 "x" $1}'`
# test if stty did not output a useful value:
case "$geometry" in
0x0 ) geometry=80x24 ;;
"" ) geometry=80x24 ;;
esac
case $# in
0 ) cat > $TMPFILE ;;
1 ) case "$1" in
-* ) echo "$usage"; exit 0 ;;
* ) cat "$1" > $TMPFILE ;;
esac ;;
2 ) case "$1" in
-geometry ) geometry=$2
cat > $TMPFILE ;;
* ) echo "$usage"; exit 0 ;;
esac ;;
3 ) case "$1" in
-geometry ) geometry=$2
cat $3 > $TMPFILE ;;
* ) echo "$usage"; exit 0 ;;
esac ;;
* ) echo "$usage"; exit 0 ;;
esac
# multiply x with 2 and y with 4 (pbmtoascii divides by 2x4)
geometry=`echo $geometry | awk -Fx '{print 2*$1 "x" 4*$2}'`
$CONVERT -geometry $geometry $TMPFILE $TMPFILE.pbm
$PBMTOASCII -2x4 < $TMPFILE.pbm
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