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#!/bin/bash
# Convert a huge .png file into smaller chunks for LeafletJS.
#
# Copyright (C) 2020 Y. Wang <ywang@forksworld.de>
# Copyright (C) 2020 Markus Koch <markus@notsyncing.net>
#
# This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
# You can obtain a copy of the license at https://mozilla.org/MPL/2.0/.
TILESIZE=256
MAPFILE="$1"
MAPNAME="${1/.png/}"
width=`file "$MAPFILE" | sed -n "s/.* \([0-9]\+\) x \([0-9]\+\).*/\1/p"`
crop=$TILESIZE
zoom=0
# Enabled because my VPS
IMFLAGS="-limit area 0"
#IMFLAGS=""
echo -n "Getting highest zoomlevel... ";
while [ $crop -lt $width ]; do
crop=$(($crop * 2));
zoom=$(($zoom + 1));
done;
echo "$zoom";
echo "Extending map for maptile generation..."
extended=$(mktemp)
echo " The extended map is temporarily saved to $extended."
convert $MAPFILE -extent ${crop}x${crop} png:$extended
while [ $zoom -ge 0 ]; do
out="$MAPNAME/$zoom"
tempfile=$out/temp.png
echo "Generating maps for zoomlevel $zoom to $out..."
mkdir -p $out;
echo " Scaling image..."
convert png:$extended -resize ${crop}x${crop} $tempfile
echo " Generating tiles..."
convert $tempfile -crop ${TILESIZE}x${TILESIZE} +adjoin $out/%d.png
rm $tempfile
echo " Creating symlinks..."
n=$(($crop / $TILESIZE))
for i in $(seq 0 $(($n-1))); do
rm -rf $out/$i >/dev/null 2>/dev/null # Nobody cares if this fails ...
mkdir $out/$i
for j in $(seq 0 $(($n-1))); do
ln -s ../$(($j*$n+$i)).png $out/$i/${j}.png
done
done
crop=$(($crop / 2))
zoom=$(($zoom - 1))
done;
rm $extended
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