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389 lines
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28 KiB
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<meta name="keywords" content="m4, SVG, XSLT, XML, design, programmation, fractales">
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<link rel="shortcut icon" type="image/x-icon" href="/Scratch/img/favicon.ico" />
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<link rel="stylesheet" type="text/css" href="/Scratch/assets/css/main.css" />
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<link rel="alternate" type="application/rss+xml" title="RSS" href="http://feeds.feedburner.com/yannespositocomfr"/>
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<link rel="alternate" lang="fr" xml:lang="fr" title="Accroître le pouvoir des languages déficients." type="text/html" hreflang="fr" href="/Scratch/fr/blog/SVG-and-m4-fractals/" />
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<link rel="alternate" lang="en" xml:lang="en" title="Increase the power of deficient languages." type="text/html" hreflang="en" href="/Scratch/en/blog/SVG-and-m4-fractals/" />
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<script type="text/javascript" src="/Scratch/js/index.js"></script>
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<!--[if lt IE 9]>
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<script src="http://ie7-js.googlecode.com/svn/version/2.1(beta4)/IE9.js"></script>
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<![endif]-->
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<title>Accroître le pouvoir des languages déficients.</title>
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</head>
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<body lang="fr" class="article">
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<script type="text/javascript">// <![CDATA[
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document.write('<div id="blackpage"><img src="/Scratch/img/loading.gif" alt="Chargement en cours..."/></div>');
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// ]]>
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</script>
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<div id="content">
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<div id="choix">
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<div class="return"><a href="#entete">↓ Menu ↓</a></div>
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<div id="choixlang">
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<a href="/Scratch/en/blog/SVG-and-m4-fractals/" onclick="setLanguage('en')">in English</a>
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</div>
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<div class="flush"></div>
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</div>
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<div id="titre">
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<h1>
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Accroître le pouvoir des languages déficients.
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</h1>
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<h2>
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Fractales en SVG avec m4
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</h2>
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</div>
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<div class="flush"></div>
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<div class="flush"></div>
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<div id="afterheader">
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<div class="corps">
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<p><img alt="Yesod logo made in SVG and m4" src="/Scratch/img/blog/SVG-and-m4-fractals/main.png" /></p>
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<div class="intro">
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<p><span class="sc"><abbr title="Trop long à lire">tlàl</abbr> : </span> Utiliser m4 pour accroître le pouvoir d’<span class="sc">xslt</span> et d’<span class="sc">svg</span>. Example cool, les fractales.</p>
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</div>
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<p>Lorsqu’<span class="sc">xml</span> fût inventé beaucoup pensaient que c’était l’avenir.
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Passer de fichiers plat à des fichiers structurés standardisés fût un grand progrès dans beaucoup de domaines.
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Cerain se mirent à voir du <span class="sc">xml</span> de partout.
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À tel point que les les format compatibles <span class="sc">xml</span> naquirent de toute part.
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Non seulement comme format de fichier, mais aussi comme format pour un langage de programmation.</p>
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<p>Ô joie !</p>
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<p>Malheureusement, <span class="sc">xml</span> fût fabriquer pour le transfert de données.
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Pas du tout pour être vu ou édité directement.
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La triste vérité est qu’<span class="sc">xml</span> est verbeux et laid.
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Dans un monde parfait, nous ne devrions avoir des programmes qui s’occupent de nous afficher correctement le <span class="sc">xml</span> pour nous épargner la peine de les voir directement.
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Mais devinez quoi ?
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Notre monde n’est pas parfait.
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Beaucoup de programmeurs sont ainsi forcé de travailler
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directement avec de l’<span class="sc">xml</span>.</p>
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<p><span class="sc">xml</span>, n’est pas le seul cas de format mal utilisé que je connaisse.
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Vous avez d’autres formats dans lesquels il serait très agréable d’ajouter des variables, des boucles, des fonctions…</p>
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<p>Mais je suis là pour vous aider.
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Si comme moi vous détestez <span class="sc">xslt</span> ou écrire de l’<span class="sc">xml</span>.
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Je vais vous montrer une façon d’améliorer tout ça.</p>
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<h2 id="un-exemple-avec-span-classscxsltspan">Un exemple avec <span class="sc">xslt</span></h2>
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<p>Commençons avec le pire cas de langage <span class="sc">xml</span> que je connaisse : <span class="sc">xslt</span>.
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Tous les développeurs qui ont déjà dû écrire du <span class="sc">xslt</span> savent à quel point ce langage est horrible.</p>
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<p>Pour réduire la “verbosité” de tels langages, il y a un moyen.
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<strong><code>m4</code></strong>.
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Oui, le préprocesseur utilisé par <code>C</code> et <code>C++</code>.</p>
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<p>Voici certains exemples :</p>
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<ul>
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<li>Les variables, au lieu d’écrire <code>myvar = value</code>, voici la version <span class="sc">xslt</span> :</li>
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</ul>
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<pre class="twilight">
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">variable</span> <span class="MetaTagAll">name</span>=<span class="String"><span class="String">"</span>myvar<span class="String">"</span></span> <span class="MetaTagAll">select</span>=<span class="String"><span class="String">"</span>value<span class="String">"</span></span><span class="MetaTagAll">/></span></span>
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</pre>
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<ul>
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<li>Afficher quelquechose. Au lieu de <code>print "Hello world!"</code>, <span class="sc">xslt</span> nous offre :</li>
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</ul>
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<pre class="twilight">
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">text</span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">disable-output-escaping</span>=<span class="String"><span class="String">"</span>yes<span class="String">"</span></span><span class="MetaTagAll">></span></span><span class="String"><span class="String"><![CDATA[</span>Hello world!</span>
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<span class="String"><span class="String">]]></span></span><span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">text</span><span class="MetaTagAll">></span></span>
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</pre>
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<ul>
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<li>afficher la valeur d’une variable, au lieu de <code>print myvar</code>, nous avons droit à :</li>
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</ul>
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<pre class="twilight">
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">xslt</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">value-of</span> <span class="MetaTagAll">select</span>=<span class="String"><span class="String">"</span>myvar<span class="String">"</span></span><span class="MetaTagAll">/></span></span>
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</pre>
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<ul>
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<li>Essayez d’imaginer à quel point il est verbeux de déclarer une fonction dans ce langage.</li>
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</ul>
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<h2 id="la-solution-m4--la-rescousse">La solution (m4 à la rescousse)</h2>
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<pre class="twilight">
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<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing"><?</span><span class="DoctypeXmlProcessing">xml</span><span class="DoctypeXmlProcessing"> version</span>=<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing">"</span>1.0<span class="DoctypeXmlProcessing">"</span></span><span class="DoctypeXmlProcessing"> standalone</span>=<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing">"</span>yes<span class="DoctypeXmlProcessing">"</span></span><span class="DoctypeXmlProcessing">?></span></span> <span class="Comment"><span class="Comment"><!--</span> YES its <span class="sc">xml</span> <span class="Comment">--></span></span>
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<span class="Comment"><span class="Comment"><!--</span> ← start a comment, then write some m4 directives:</span>
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<span class="Comment"></span>
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<span class="Comment">define(`ydef',`<xsl:variable name="$1" select="$2"/>')</span>
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<span class="Comment">define(`yprint',`<xsl:text disable-output-escaping="yes"><![CDATA[$1]]></xsl:text>')</span>
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<span class="Comment">define(`yshow',`<xsl:value-of select="$1"/>')</span>
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<span class="Comment"></span>
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<span class="Comment"><span class="Comment">--></span></span>
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<span class="Comment"><span class="Comment"><!--</span> Yes, <span class="sc">xml</span> sucks to be read <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">stylesheet</span> <span class="MetaTagAll">version</span>=<span class="String"><span class="String">"</span>1.0<span class="String">"</span></span> <span class="MetaTagAll">xmlns</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">xsl</span>=<span class="String"><span class="String">"</span>http://www.w3.org/1999/XSL/Transform<span class="String">"</span></span><span class="MetaTagAll">></span></span>
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<span class="Comment"><span class="Comment"><!--</span> And it sucks even more to edit <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">template</span> <span class="MetaTagAll">match</span>=<span class="String"><span class="String">"</span>/<span class="String">"</span></span><span class="MetaTagAll">></span></span>
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ydef(myvar,value)
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yprint(Hello world!)
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yshow(myvar)
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<span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">xsl</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">template</span><span class="MetaTagAll">></span></span>
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</pre>
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<p>Maintenant compilons simplement ce fichier :</p>
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<pre class="twilight">
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m4 myfile.m4 <span class="Keyword">></span> myfile.xslt
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</pre>
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<p>Et vous pouvez profitez ! Maintenant <span class="sc">xslt</span> devient plus lisible et plus facile à éditer.</p>
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<h2 id="la-partie-la-plus-cool-les-fractales-">La partie la plus cool: les fractales !</h2>
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<p>À ses débuts, beaucoup pensaient que ce serait le nouveau Flash. Apparemment, ce devrait plutôt être <code>canvas</code> avec du javascript qui occupera cette place.</p>
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<p>Tout d’abord, laissez moi vous montrer le résultat :</p>
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<p><a href="/Scratch/img/blog/SVG-and-m4-fractals/main.svg">
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<img alt="Yesod logo made in SVG and m4" src="/Scratch/img/blog/SVG-and-m4-fractals/main.png" />
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Cliquez sur l’image pour voir le <span class="sc">svg</span> directement. Attention, si vous n’avez pas un ordinateur récent, ça risque de ramer.
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</a></p>
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<p>Le positionnement du texte “esod” par rapport au “λ” renversé a été en jouant avec firebug. De cette façon je n’avais pas à regénérer pour tester.</p>
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<p>Faire une telle fractale revient à :</p>
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<ol>
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<li>Choisir un élément racine ;</li>
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<li>le dupliquer et le transformer ;</li>
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<li>le résultat est un nouveau sous-élément ;</li>
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<li>répéter à partir de 2 mais en utilisant le sous-élément comme nouvelle racine.</li>
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<li>Arréter lorsque la récursion est assez profonde.</li>
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</ol>
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<p>Si j’avais dû faire ça manuellement, il m’aurait fallu faire beaucoup de copier/coller dans mon <span class="sc">svg</span>.
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Simplement parce que la transformation est toujours la même, mais je ne pouvais pas dire, utiliser la transformation appelée “titi”.
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Plutôt que copier du <span class="sc">xml</span>, j’ai utilisé m4.</p>
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<p>Et voici le code commenté :</p>
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<div class="code"><div class="file"><a href="/Scratch/fr/blog/SVG-and-m4-fractals/code/yesodlogo.m4"> ➥ yesodlogo.m4 </a></div><div class="withfile">
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<pre class="twilight">
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<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing"><?</span><span class="DoctypeXmlProcessing">xml</span><span class="DoctypeXmlProcessing"> version</span>=<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing">"</span>1.0<span class="DoctypeXmlProcessing">"</span></span><span class="DoctypeXmlProcessing"> encoding</span>=<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing">"</span>UTF-8<span class="DoctypeXmlProcessing">"</span></span><span class="DoctypeXmlProcessing"> standalone</span>=<span class="DoctypeXmlProcessing"><span class="DoctypeXmlProcessing">"</span>no<span class="DoctypeXmlProcessing">"</span></span><span class="DoctypeXmlProcessing">?></span></span>
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<span class="Comment"><span class="Comment"><!--</span></span>
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<span class="Comment"> M4 Macros</span>
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<span class="Comment">define(`YTRANSFORMONE', `scale(.43) translate(-120,-69) rotate(-10)')</span>
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<span class="Comment">define(`YTRANSFORMTWO', `scale(.43) translate(-9,-67.5) rotate(10)')</span>
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<span class="Comment">define(`YTRANSFORMTHREE', `scale(.43) translate(53,41) rotate(120)')</span>
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<span class="Comment">define(`YGENTRANSFORM', `translate(364,274) scale(3)')</span>
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<span class="Comment">define(`YTRANSCOMPLETE', `</span>
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<span class="Comment"> <g id="level_$1"></span>
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<span class="Comment"> <use style="opacity: .8" transform="YTRANSFORMONE" xlink:href="#level_$2" /></span>
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<span class="Comment"> <use style="opacity: .8" transform="YTRANSFORMTWO" xlink:href="#level_$2" /></span>
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<span class="Comment"> <use style="opacity: .8" transform="YTRANSFORMTHREE" xlink:href="#level_$2" /></span>
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<span class="Comment"> </g></span>
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<span class="Comment"> <use transform="YGENTRANSFORM" xlink:href="#level_$1" /></span>
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<span class="Comment">')</span>
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<span class="Comment"> <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">svg</span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">xmlns</span>=<span class="String"><span class="String">"</span>http://www.w3.org/2000/svg<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">xmlns</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">xlink</span>=<span class="String"><span class="String">"</span>http://www.w3.org/1999/xlink<span class="String">"</span></span></span>
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<span class="MetaTagAll"> <span class="MetaTagAll">x</span>=<span class="String"><span class="String">"</span>64<span class="String">"</span></span> <span class="MetaTagAll">y</span>=<span class="String"><span class="String">"</span>64<span class="String">"</span></span> <span class="MetaTagAll">width</span>=<span class="String"><span class="String">"</span>512<span class="String">"</span></span> <span class="MetaTagAll">height</span>=<span class="String"><span class="String">"</span>512<span class="String">"</span></span> <span class="MetaTagAll">viewBox</span>=<span class="String"><span class="String">"</span>64 64 512 512<span class="String">"</span></span></span>
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<span class="MetaTagAll"> <span class="MetaTagAll">id</span>=<span class="String"><span class="String">"</span>svg2<span class="String">"</span></span> <span class="MetaTagAll">version</span>=<span class="String"><span class="String">"</span>1.1<span class="String">"</span></span><span class="MetaTagAll">></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">g</span> <span class="MetaTagAll">id</span>=<span class="String"><span class="String">"</span>level_0<span class="String">"</span></span><span class="MetaTagAll">></span></span> <span class="Comment"><span class="Comment"><!--</span> some group, if I want to add other elements <span class="Comment">--></span></span>
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<span class="Comment"><span class="Comment"><!--</span> the text "λ" <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">text</span> <span class="MetaTagAll">id</span>=<span class="String"><span class="String">"</span>lambda<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">fill</span>=<span class="String"><span class="String">"</span>#333<span class="String">"</span></span> <span class="MetaTagAll">style</span>=<span class="String"><span class="String">"</span>font-family:Ubuntu; font-size: 100px<span class="String">"</span></span></span>
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<span class="MetaTagAll"> <span class="MetaTagAll">transform</span>=<span class="String"><span class="String">"</span>rotate(180)<span class="String">"</span></span><span class="MetaTagAll">></span></span>λ<span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">text</span><span class="MetaTagAll">></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">g</span><span class="MetaTagAll">></span></span>
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<span class="Comment"><span class="Comment"><!--</span> the text "esod" <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">text</span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">fill</span>=<span class="String"><span class="String">"</span>#333<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">style</span>=<span class="String"><span class="String">"</span>font-family:Ubuntu; font-size: 28px; letter-spacing: -0.10em<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">x</span>=<span class="String"><span class="String">"</span>-17.3<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">y</span>=<span class="String"><span class="String">"</span>69<span class="String">"</span></span> </span>
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<span class="MetaTagAll"> <span class="MetaTagAll">transform</span>=<span class="String"><span class="String">"</span>YGENTRANSFORM<span class="String">"</span></span><span class="MetaTagAll">></span></span>esod<span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">text</span><span class="MetaTagAll">></span></span>
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<span class="Comment"><span class="Comment"><!--</span> ROOT ELEMENT <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"><</span><span class="MetaTagAll">use</span> <span class="MetaTagAll">transform</span>=<span class="String"><span class="String">"</span>YGENTRANSFORM<span class="String">"</span></span> <span class="MetaTagAll">xlink</span><span class="MetaTagAll"><span class="MetaTagAll">:</span></span><span class="MetaTagAll">href</span>=<span class="String"><span class="String">"</span>#level_0<span class="String">"</span></span> <span class="MetaTagAll">/></span></span>
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YTRANSCOMPLETE(1,0) <span class="Comment"><span class="Comment"><!--</span> First recursion <span class="Comment">--></span></span>
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YTRANSCOMPLETE(2,1) <span class="Comment"><span class="Comment"><!--</span> deeper <span class="Comment">--></span></span>
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YTRANSCOMPLETE(3,2) <span class="Comment"><span class="Comment"><!--</span> deeper <span class="Comment">--></span></span>
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YTRANSCOMPLETE(4,3) <span class="Comment"><span class="Comment"><!--</span> even deeper <span class="Comment">--></span></span>
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YTRANSCOMPLETE(5,4) <span class="Comment"><span class="Comment"><!--</span> Five level seems enough <span class="Comment">--></span></span>
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<span class="MetaTagAll"><span class="MetaTagAll"></</span><span class="MetaTagAll">svg</span><span class="MetaTagAll">></span></span>
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</pre>
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</div></div>
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<p>et je l’ai compile en <span class="sc">svg</span> et ensuite en <span class="sc">png</span> avec :</p>
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<pre class="twilight">
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m4 yesodlogo.m4 <span class="Keyword">></span> yesodlogo.svg <span class="Keyword">&&</span> convert yesodlogo.svg yesodlogo.png
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</pre>
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<p>Le λ est dupliqué avec trois “transformations” différentes. Les transformations sont : <code>YTRANSFORMONE</code>, <code>YTRANSFORMTWO</code> et <code>YTRANSFORMTHREE</code>.</p>
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<p>Chaque transformation est une similarité (translation + rotation + zoom, ce qui est équivalent à juste rotation + zoom, mais bon).</p>
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<p>Une fois fixée chaque transformation peut ensuite être réutilisée pour chaque nouveau niveau.</p>
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<p>Maintenant <code>YTRANSCOMPLETE</code> entre en jeu.
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Cette macro prend deux arguments.
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Le niveau courant et le niveau précédent.
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Cette macro va dupliquer le niveau précédent en lui appliquant chacune des 3 transformations.
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Au niveau 0, le contenu est un seul grand λ, le niveau 1 en contient 3. Le niveau 2 en contient 9, etc…
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Le niveau 5 contient 3<sup>5</sup>=243 λ.
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Tous les niveaux combinés représentent 3<sup>6</sup>-1 / 2 = 364 λ.</p>
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<p>L’avantage principal c’est que je pouvais visualiser le résultat final facilement.
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Sans ce système de macro, pour faire une preview il m’aurait fallu faire des copier/coller + quelques modifications à chaque essai.</p>
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<h2 id="conclusion">Conclusion</h2>
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<p>Ce fut très amusant de faire une fractale en <span class="sc">svg</span>, mais la partie la plus intéressante était d’augmenter la puissance d’expressivité du langage en utilise un préprocesseur.
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J’ai utilisé cette méthode avec <span class="sc">xslt</span> pour une vrai application par exemple.
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On peut aussi utiliser m4 pour faire des includes d’autres fichiers.
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Typiquement je l’ai utiliser pour les includes dans un format obscur.
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Mais vous pouvez aussi le considérer pour des includes dans du HTML.
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Par exemple pour fabriquer un site statique rapidement, m4 peut se révéler utile pour inclure un footer ou un menu sur toutes les pages par exemple.
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J’ai aussi pensé que l’on pouvait utiliser m4 pour structurer des programmes comme brainfuck.</p>
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