54 lines
1.5 KiB
Bash
54 lines
1.5 KiB
Bash
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#!/bin/bash
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# Convert a huge .png file into smaller chunks for LeafletJS.
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#
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# Copyright (C) 2020 Markus Koch <markus@notsyncing.net>
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#
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# This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
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# You can obtain a copy of the license at https://mozilla.org/MPL/2.0/.
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# TODO: The width of the input png has to be a multiple of TILESIZE, otherwise bad things will happen.
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# Workaround for now is to add white borders on the bottom and right:
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# `convert $MAPFILE -extent ${crop}x${crop} -gravity NorthWest $MAPFILE.scaled.png`
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TILESIZE=256
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MAPNAME="world-2020-04-09"
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MAPFILE="../$MAPNAME.png"
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width=`file "$MAPFILE" | sed -n "s/.* \([0-9]\+\) x \([0-9]\+\).*/\1/p"`
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crop=$TILESIZE
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zoom=0
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while true; do
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out="$MAPNAME/$zoom"
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tempfile=$out/temp.png
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echo ""
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echo "Generating maps for zoomlevel $zoom to $out..."
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mkdir -p $out;
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if [ ! -f "$tempfile" ]; then
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if [ $crop -ge $width ]; then
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echo " Reached max zoom at zoomlevel $zoom [using original zoom]"
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cp $MAPFILE $tempfile
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#convert $MAPFILE -extent ${crop}x${crop} -gravity NorthWest $tempfile
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else
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echo " Scaling map for zoomlevel $zoom"
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convert $MAPFILE -resize ${crop}x${crop} $tempfile
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fi
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else
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echo " Reusing existing scaled image"
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fi
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echo " Generating tiles..."
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convert $tempfile -crop ${TILESIZE}x${TILESIZE} +adjoin $out/%05d.png
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rm $tempfile
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if [ $crop -ge $width ]; then
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break;
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fi
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crop=$(($crop * 2))
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zoom=$(($zoom + 1))
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done;
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