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#!/bin/bash
set -e
tmp_dir="$(mktemp -d)"
trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT
if [ $# -ne 3 ]; then
echo 'Verwendung: combine-images Geometrie Dateistamm_ Endung'
echo ' Geometrie hat die Form "Breite"x"Hoehe"+"x-Offset"+"y-Offset"'
exit 1
fi
geometry="$1"
stem="$2"
ending="$3"
files="$(
ls "$(dirname "${stem}")" | \
grep "^$(basename "${stem}")[0-9]\+_[0-9]\+\.${ending}\$"
)"
numbers="$(
echo "${files}" | \
sed "
s|^$(basename "${stem}")||
s|\.${ending}\$||
" | \
sort
)"
min_x="$(
echo "${numbers}" | \
sed 's|_[0-9]\+$||' | \
sort -nr | \
tail -n1
)"
max_x="$(
echo "${numbers}" | \
sed 's|_[0-9]\+$||' | \
sort -n | \
tail -n1
)"
min_y="$(
echo "${numbers}" | \
sed 's|^[0-9]\+_||' | \
sort -nr | \
tail -n1
)"
max_y="$(
echo "${numbers}" | \
sed 's|^[0-9]\+_||' | \
sort -n | \
tail -n1
)"
if ! [ "${numbers}" = "$(
for ((x=${min_x}; x<=${max_x}; x++)); do
for ((y=${min_y}; y<=${max_y}; y++)); do
echo "${x}_${y}"
done
done
)" ]; then
echo 'Die angegebenen Bilder ergeben kein Rechteck!'
exit 1
fi
for ((x=${min_x}; x<=${max_x}; x++)); do
for ((y=${min_y}; y<=${max_y}; y++)); do
convert "${stem}${x}_${y}.${ending}" -crop "${geometry}" "${tmp_dir}/C${x}_${y}.bmp"
printf '.'
done
convert $(
for ((y=${max_y}; y>=${min_y}; y--)); do
printf '%s ' "${tmp_dir}/C${x}_${y}.bmp"
done
) -append "${tmp_dir}/C${x}.bmp"
printf '.'
done
convert $(
for ((x=${min_x}; x<=${max_x}; x++)); do
printf '%s ' "${tmp_dir}/C${x}.bmp"
done
) +append "${stem%_}.${ending}"
printf '.\n'
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