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    GPX Viewer
  — David Larlet</title>
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  <meta name="description" content="Suite de mes expérimentations de la veille à la fois en cartographie et en web components. Je me suis demandé s’il était possible de faire un composant qui ne dépende pas de uMap pour afficher une trace GPX. Le fait d’avoir passé une heure à trouver la bonne CSP pour arriver à afficher une carte m’a d’une certaine manière motivé (c’était une journée galère).">
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      <h1>GPX Viewer</h1>
      <p>Le <time datetime="2024-03-26">26 mars 2024</time></p>
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<p><a href="/david/2024/03/25/" title="Inclusion">Suite de mes expérimentations</a> de la veille à la fois en cartographie et en <em>web components</em>. Je me suis demandé s’il était possible de faire un composant qui ne dépende pas de uMap pour afficher une trace GPX. Le fait d’avoir passé une heure à trouver la bonne <a data-link-domain="MDN" href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP">CSP</a> pour arriver à afficher une carte m’a d’une certaine manière motivé (c’était une journée&nbsp;galère).</p>
<p>Il se trouve qu’il existe <a data-link-domain="github.com" href="https://github.com/mpetazzoni/leaflet-gpx">leaflet-gpx</a> qui fait exactement ce que je voulais. Il ne me restait «&nbsp;plus qu’à&nbsp;» en faire un composant web, ce que j’avais déjà <a data-link-domain="gitlab.com" href="https://gitlab.com/umap-project/leaflet-webcomponents/">fait par ailleurs</a>&nbsp;:</p>
<gpx-viewer data-height="500px" data-width="800px">
  <p>
    Vous devriez voir s’afficher une carte de mon « Grand Tour de la forêt de Ouareau »,
    qui contient <a data-gpx href="/static/david/2024/grand_tour_de_la_foret_de_ouareau.gpx">cette trace GPX</a>,
    centrée sur <span data-latitude>46.2117</span>, <span data-longitude>-73.9335</span>
    avec un zoom de <span data-zoom>12</span>.
    Il est probable que cela ne s’exécute pas dans un agrégateur par exemple.
  </p>
</gpx-viewer>

<script type="module">
  import * as L from '/static/david/2024/leaflet.1.9.4/leaflet.1.9.4.js'
  window.L = L // Hack for leaflet-gpx, youpi.
</script>
<script type="module" nonce="oembed-web-component">
  class GPXViewer extends HTMLElement {
    static tagName = 'gpx-viewer'

    static register(tagName, registry) {
      if(!registry && ('customElements' in globalThis)) {
        registry = globalThis.customElements
      }
      registry?.define(tagName || this.tagName, this)
    }

    #attachCSS(path) {
      const linkElement = document.createElement('link')
      linkElement.setAttribute('rel', 'stylesheet')
      linkElement.setAttribute('href', path)
      this.shadowRoot.appendChild(linkElement)
    }

    #computeDimensions(mapContainer) {
      // There has to be a better way but I feel lazy tonight.
      let height = this.dataset.height
      let width = this.dataset.width
      // Size is in px so we strip these chars and convert to int.
      const heightValue = Number(height.slice(0, -2))
      const widthValue = Number(width.slice(0, -2))
      const mediaQueryMiddle = window.matchMedia(`(max-width: ${widthValue}px)`)
      const mediaQuerySmall = window.matchMedia(`(max-width: ${widthValue / 2}px)`)
      if (mediaQueryMiddle.matches) {
        height = `${heightValue / 2}px`
        width = `${widthValue / 2}px`
      }
      if (mediaQuerySmall.matches) {
        height = `${heightValue / 3}px`
        width = `${widthValue / 3}px`
      }
      mapContainer.style.height = height
      mapContainer.style.width = width
    }

    #createMapContainer() {
      const mapContainer = document.createElement('div')
      this.#computeDimensions(mapContainer)
      this.shadowRoot.appendChild(mapContainer)
      return mapContainer
    }

    #createMap(mapContainer) {
      const map = L.map(mapContainer).setView(
        [
          this.querySelector('[data-latitude]').textContent,
          this.querySelector('[data-longitude]').textContent,
        ],
        this.querySelector('[data-zoom]').textContent
      )
      L.tileLayer('https://tile.openstreetmap.org/{z}/{x}/{y}.png', {
        attribution:
          '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
      }).addTo(map)
      return map
    }

    #attachGPX(map) {
      const gpxUrl = this.querySelector('[data-gpx]').href
      new GPX(gpxUrl, {
        async: true,
        marker_options: {
          startIconUrl: '/static/david/2024/leaflet-gpx.1.7.0-custom/pin-icon-start.png',
          endIconUrl: '/static/david/2024/leaflet-gpx.1.7.0-custom/pin-icon-end.png',
          shadowUrl: '/static/david/2024/leaflet-gpx.1.7.0-custom/pin-shadow.png'
        }
      }).on('loaded', (e) => {
        map.fitBounds(e.target.getBounds())
      }).addTo(map)
    }

    constructor() {
      super()
      this.attachShadow({ mode: 'open' })
    }

    async connectedCallback() {
      this.#attachCSS('/static/david/2024/leaflet.1.9.4/leaflet.css')
      const mapContainer = this.#createMapContainer()
      const map = this.#createMap(mapContainer)
      this.#attachGPX(map)
    }

  }

  import GPX from '/static/david/2024/leaflet-gpx.1.7.0-custom/gpx.1.7.0-custom.js'

  GPXViewer.register()
</script>

<p>Alors en fait, comme rien n’est jamais simple en JS, il a fallu que j’adapte le plugin qui n’était pas compatible avec les modules JS et que je fasse des galipettes pour que ça finisse par tomber en marche&nbsp;🤸. Cet écosystème est merveilleux (quel métier&#8239;!). J’ai quand même <a data-link-domain="github.com" href="https://github.com/mpetazzoni/leaflet-gpx/issues/153">remonté le problème</a>.</p>
<p>Au passage, inspiré par <a data-link-domain="blog.k-nut.eu" href="https://blog.k-nut.eu/leaflet-microdata-html-webcomponent" hreflang="en"
            title="Consultation de l’article (anglais)">le travail de Knut Hühne</a>
            <a href="/david/cache/2024/65fba9cd025cd2403f932cb2c928cf14/" hreflang="en"
                data-tippy data-description="An example of using schema.org microdata to build a HTML Webcomponent for Leaflet"
                data-source="https://blog.k-nut.eu/leaflet-microdata-html-webcomponent"
                data-date="2024-03-25"
                data-favicon="https://blog.k-nut.eu/favicon-32x32.png"
                data-domain="blog.k-nut.eu"
                ><svg xmlns="http://www.w3.org/2000/svg"
                    width="24" height="24" viewBox="0 0 24 24" fill="none"
                    stroke="currentColor" stroke-width="2" stroke-linecap="square"
                    stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle>
                    <path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path>
                    <line x1="12" y1="17" x2="12.01" y2="17"></line>
                </svg>
                <span class="sr-only">[archive]</span></a> sur la sémantique des données d’une carte, je me suis demandé si j’allais définir un <a data-link-domain="schema.org" href="https://schema.org/itinerary">itinerary</a> pour un <a data-link-domain="schema.org" href="https://schema.org/Trip">Trip</a> avec des <a data-link-domain="schema.org" href="https://schema.org/GeoCoordinates">GeoCoordinates</a> mais ça m’a fait tirer un fil beaucoup trop long. Je garde l’idée sous le coude <a data-link-domain="umap-project.gitlab.io" href="https://umap-project.gitlab.io/leaflet-webcomponents/">pour mes propres recherches</a> dans le domaine cela&nbsp;dit.</p>
<p>Un composant de plus, je ne suis pas très satisfait de celui-ci car j’avais l’espoir d’arriver à quelque chose de facilement réutilisable. J’aurais au moins commencé à mettre les doigts dans le XML du format GPX. Il est possible de définir plusieurs segments au sein d’une même trace. Il peut y avoir pas mal de métadonnées, notamment de mise en forme de la trace mais aussi de caractéristiques (biologiques, physiques, etc).</p>
<a href="#hr-138" title="Lien vers cette section de la page"><hr id="hr-138" /></a>

<blockquote lang="en">
<p>The fact is that we can’t rely on any single website to hold the whole world’s knowledge, because it can be corrupted sooner or later. The only solution is a distributed architecture, with many smaller websites connecting with each other and sharing information. This is where ActivityPub comes in, the protocol used by Mastodon, Lemmy, Peertube and many other federated social media&nbsp;projects.</p>
<p>I have worked on Lemmy for the past four years, bringing it from a prototype to a fully functional Reddit alternative. I wrote the entire federation code and became very familiar with the protocol. <mark>I realized that the same technology easily be used to create a federated encyclopedia.</mark> As no one else took up such a project, I finally decided to do it on my own and create Ibis. Thanks to my previous experience with the tech stack and the ActivityPub library I created, I was able to complete a proof of concept in a relatively short time of four&nbsp;months.</p>
<p><cite><em><a data-link-domain="ibis.wiki" href="https://ibis.wiki/article/Announcing_Ibis,_the_federated_Wikipedia_Alternative@ibis.wiki" hreflang="en"
            title="Consultation de l’article (anglais)">Announcing Ibis, the federated Wikipedia Alternative</a>
            <a href="/david/cache/2024/691120ebac09f68413501b7f5daa2db7/" hreflang="en"
                data-tippy data-description=""
                data-source="https://ibis.wiki/article/Announcing_Ibis,_the_federated_Wikipedia_Alternative@ibis.wiki"
                data-date="2024-03-26"
                data-favicon=""
                data-domain="ibis.wiki"
                ><svg xmlns="http://www.w3.org/2000/svg"
                    width="24" height="24" viewBox="0 0 24 24" fill="none"
                    stroke="currentColor" stroke-width="2" stroke-linecap="square"
                    stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle>
                    <path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path>
                    <line x1="12" y1="17" x2="12.01" y2="17"></line>
                </svg>
                <span class="sr-only">[archive]</span></a></em></cite></p>
</blockquote>
<p>Wikipedia décentralisé, je dis oui&#8239;! Merci <a data-link-domain="alexsirac.com" href="https://alexsirac.com/activitypub-powered-wikis/" hreflang="fr"
            title="Consultation de l’article">Alex</a>
            <a href="/david/cache/2024/55c19feff784a41d2527b5f1589d931d/" hreflang="fr"
                data-tippy data-description=""
                data-source="https://alexsirac.com/activitypub-powered-wikis/"
                data-date="2024-03-26"
                data-favicon="https://alexsirac.com/wp-content/uploads/2023/01/cropped-cropped-portraitplante-32x32.webp"
                data-domain="alexsirac.com"
                ><svg xmlns="http://www.w3.org/2000/svg"
                    width="24" height="24" viewBox="0 0 24 24" fill="none"
                    stroke="currentColor" stroke-width="2" stroke-linecap="square"
                    stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle>
                    <path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path>
                    <line x1="12" y1="17" x2="12.01" y2="17"></line>
                </svg>
                <span class="sr-only">[archive]</span></a>.</p>
<p>C’est important pour <a href="/david/2024/02/29/" title="Wikipédia">diverses</a> <a href="/david/2024/03/07/" title="Sondages">raisons</a>.</p>
<a href="#hr-139" title="Lien vers cette section de la page"><hr id="hr-139" /></a>

<blockquote lang="en">
<p>I think it’s time to admit that my hobby is buying stuff for my new&nbsp;hobby.</p>
<p><cite><em>Chris Hallbeck</em>, <a data-link-domain="mastodon.social" href="https://mastodon.social/@Chrishallbeck/112153815963114685">sur&nbsp;masto</a></cite></p>
</blockquote>
<p><em>Touché.</em></p>

  
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