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<td class='lines'><pre><code><span class="hl slc">#!/bin/bash</span>
<span class="hl slc"># Convert a huge .png file into smaller chunks for LeafletJS.</span>
<span class="hl slc">#</span>
<span class="hl slc"># Copyright (C) 2020  Markus Koch &lt;markus&#64;notsyncing.net&gt; </span>
<span class="hl slc">#</span>
<span class="hl slc"># This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.</span>
<span class="hl slc"># You can obtain a copy of the license at https://mozilla.org/MPL/2.0/.</span>

<span class="hl slc"># TODO: The width of the input png has to be a multiple of TILESIZE, otherwise bad things will happen.</span>
<span class="hl slc">#       Workaround for now is to add white borders on the bottom and right:</span>
<span class="hl slc">#         `convert $MAPFILE -extent ${crop}x${crop} -gravity NorthWest $MAPFILE.scaled.png`</span>

TILESIZE<span class="hl opt">=</span><span class="hl num">256</span>
MAPNAME<span class="hl opt">=</span><span class="hl str">&quot;world-2020-04-09&quot;</span>
MAPFILE<span class="hl opt">=</span><span class="hl str">&quot;../</span><span class="hl ipl">$MAPNAME</span><span class="hl str">.png&quot;</span>

width<span class="hl opt">=</span><span class="hl str">`file &quot;</span><span class="hl ipl">$MAPFILE</span><span class="hl str">&quot; | sed -n &quot;s/.* \([0-9]\+\) x \([0-9]\+\).*/\1/p&quot;`</span>
crop<span class="hl opt">=</span><span class="hl kwd">$TILESIZE</span>
zoom<span class="hl opt">=</span><span class="hl num">0</span>

<span class="hl kwa">while</span> true<span class="hl opt">;</span> <span class="hl kwa">do</span>
	out<span class="hl opt">=</span><span class="hl str">&quot;</span><span class="hl ipl">$MAPNAME</span><span class="hl str">/</span><span class="hl ipl">$zoom</span><span class="hl str">&quot;</span>
	tempfile<span class="hl opt">=</span><span class="hl kwd">$out</span><span class="hl opt">/</span>temp.png
	
	<span class="hl kwb">echo</span> <span class="hl str">&quot;&quot;</span>
	<span class="hl kwb">echo</span> <span class="hl str">&quot;Generating maps for zoomlevel</span> <span class="hl ipl">$zoom</span> <span class="hl str">to</span> <span class="hl ipl">$out</span><span class="hl str">...&quot;</span>
		
	mkdir <span class="hl kwb">-p</span> <span class="hl kwd">$out</span><span class="hl opt">;</span>
	
	<span class="hl kwa">if</span> <span class="hl opt">[ !</span> <span class="hl kwb">-f</span> <span class="hl str">&quot;</span><span class="hl ipl">$tempfile</span><span class="hl str">&quot;</span> <span class="hl opt">];</span> <span class="hl kwa">then</span>
		<span class="hl kwa">if</span> <span class="hl opt">[</span> <span class="hl kwd">$crop</span> <span class="hl kwb">-ge</span> <span class="hl kwd">$width</span> <span class="hl opt">];</span> <span class="hl kwa">then</span>
			<span class="hl kwb">echo</span> <span class="hl str">&quot;  Reached max zoom at zoomlevel</span> <span class="hl ipl">$zoom</span> <span class="hl str">[using original zoom]&quot;</span>
			<span class="hl kwc">cp</span> <span class="hl kwd">$MAPFILE $tempfile</span>
			<span class="hl slc">#convert $MAPFILE -extent ${crop}x${crop} -gravity NorthWest $tempfile</span>
		<span class="hl kwa">else</span>
			<span class="hl kwb">echo</span> <span class="hl str">&quot;  Scaling map for zoomlevel</span> <span class="hl ipl">$zoom</span><span class="hl str">&quot;</span>
			convert <span class="hl kwd">$MAPFILE</span> <span class="hl kwb">-resize</span> <span class="hl kwd">${crop}</span>x<span class="hl kwd">${crop} $tempfile</span>
		<span class="hl kwa">fi</span>
	<span class="hl kwa">else</span>
		<span class="hl kwb">echo</span> <span class="hl str">&quot;  Reusing existing scaled image&quot;</span>
	<span class="hl kwa">fi</span>

	<span class="hl kwb">echo</span> <span class="hl str">&quot;  Generating tiles...&quot;</span>
	convert <span class="hl kwd">$tempfile</span> <span class="hl kwb">-crop</span> <span class="hl kwd">${TILESIZE}</span>x<span class="hl kwd">${TILESIZE}</span> <span class="hl opt">+</span>adjoin <span class="hl kwd">$out</span><span class="hl opt">/%</span>d.png
	
	<span class="hl kwc">rm</span> <span class="hl kwd">$tempfile</span>
	
	<span class="hl kwa">if</span> <span class="hl opt">[</span> <span class="hl kwd">$crop</span> <span class="hl kwb">-ge</span> <span class="hl kwd">$width</span> <span class="hl opt">];</span> <span class="hl kwa">then</span>
		<span class="hl kwb">break</span><span class="hl opt">;</span>
	<span class="hl kwa">fi</span>
	crop<span class="hl opt">=</span>$<span class="hl opt">((</span><span class="hl kwd">$crop</span> <span class="hl opt">*</span> <span class="hl num">2</span><span class="hl opt">))</span>
	zoom<span class="hl opt">=</span>$<span class="hl opt">((</span><span class="hl kwd">$zoom</span> <span class="hl opt">+</span> <span class="hl num">1</span><span class="hl opt">))</span>
<span class="hl kwa">done</span><span class="hl opt">;</span>

<span class="hl kwb">echo</span> <span class="hl str">&quot;Renaming files...&quot;</span>
<span class="hl kwa">for</span> <span class="hl opt">((</span> z<span class="hl opt">=</span><span class="hl num">0</span><span class="hl opt">;</span> z<span class="hl opt">&lt;=</span><span class="hl kwd">$zoom</span><span class="hl opt">;</span> z<span class="hl opt">++ )) {</span>
	<span class="hl kwb">echo</span> <span class="hl str">&quot;Zoom level</span> <span class="hl ipl">$z</span><span class="hl str">&quot;</span>
	fac<span class="hl opt">=</span>$<span class="hl opt">((</span><span class="hl num">2</span><span class="hl opt">**</span><span class="hl kwd">$z</span><span class="hl opt">))</span>
	<span class="hl kwa">for</span> <span class="hl opt">((</span> y<span class="hl opt">=</span><span class="hl num">0</span><span class="hl opt">;</span> y<span class="hl opt">&lt;</span><span class="hl kwd">$fac</span><span class="hl opt">;</span> y<span class="hl opt">++ )) {</span>
		outdir<span class="hl opt">=</span><span class="hl str">&quot;</span><span class="hl ipl">$MAPNAME</span><span class="hl str">/</span><span class="hl ipl">$z</span><span class="hl str">/</span><span class="hl ipl">$y</span><span class="hl str">&quot;</span>
		mkdir <span class="hl kwd">$outdir</span>
		<span class="hl kwa">for</span> <span class="hl opt">((</span> x<span class="hl opt">=</span><span class="hl num">0</span><span class="hl opt">;</span> x<span class="hl opt">&lt;</span><span class="hl kwd">$fac</span><span class="hl opt">;</span> x<span class="hl opt">++ )) {</span>
			<span class="hl kwc">mv</span> <span class="hl kwd">$MAPNAME</span><span class="hl opt">/</span><span class="hl kwd">$z</span><span class="hl opt">/</span>$<span class="hl opt">((</span><span class="hl kwd">$fac</span> <span class="hl opt">*</span> y <span class="hl opt">+</span> <span class="hl kwd">$x</span><span class="hl opt">))</span>.png <span class="hl kwd">$outdir</span><span class="hl opt">/</span><span class="hl kwd">$x</span>.png
		<span class="hl opt">}</span>
	<span class="hl opt">}</span>
<span class="hl opt">}</span>
</code></pre></td></tr></table>
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