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-rwxr-xr-xcontent/Informatique/2021-01-03-calligraphie.rst106
-rwxr-xr-xcontent/pages/script.it/script.js3286
-rwxr-xr-xcontent/pages/script.it/script.rst26
-rwxr-xr-xcontent/pages/script.it/worker.js2351
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diff --git a/content/Informatique/2021-01-03-calligraphie.rst b/content/Informatique/2021-01-03-calligraphie.rst
new file mode 100755
index 0000000..3fd6e30
--- /dev/null
+++ b/content/Informatique/2021-01-03-calligraphie.rst
@@ -0,0 +1,106 @@
+.. -*- mode: rst -*-
+.. -*- coding: utf-8 -*-
+
+================================
+De la calligraphie en javascript
+================================
+
+:date: 2021-01-03
+:tags: javascript
+:summary: |summary|
+
+.. default-role:: literal
+
+.. |summary| replace::
+
+ Un petit bilan après avoir réalisé une application de calligraphie sur le
+ blog :)
+
+À la suite de mon article précédent, j'ai essayé d'aller un peu plus loin dans
+ce qu'il était possible de faire en javascript. La page pour construire les
+graphes montrait déjà qu'il était possible de charger du javascript dans la
+page, et modifier directement le contenu du blog à partir du code exécuté.
+
+En suivant toujours la même démarche (code en OCaml, compilé en javascript),
+j'ai mis en place une *ardoise* dans laquelle je souhaitais retrouver sur PC le
+rendu que l'on peut avoir avec une plume dans la main : `l'ardoise calligraphique`_.
+
+.. _l'ardoise calligraphique: {filename}/pages/script.it/script.rst#ardoise-calligraphique
+
+Ce que j'ai appris
+==================
+
+Les courbes de beziers ! Je ne pensais pas qu'il y aurait autant à faire avec !
+Pour ceux que cela intéresse, la page `A Primer on Bézier Curves`_ est une
+référence avec tout ce qu'il faut pour mettre en place ses propres librairies.
+
+.. _A Primer on Bézier Curves: https://pomax.github.io/bezierinfo/
+
+Afin d'avoir un tracé souple de la courbe, j'ai suivi un document de l'UCLA_
+qui explique comment construire les courbes de beziers en suivant une série de
+points, ce qui m'a fait faire un détour par les produits matriciels pour
+résoudre ce genre d'équations :
+
+.. _ucla: https://www.math.ucla.edu/~baker/149.1.02w/handouts/dd_splines.pdf
+
+.. math::
+
+ \begin{bmatrix}4 && 1 && 0 && 0 \\\\ 1 && 4 && 1 && 0 \\\\0 && 1 && 4 && 1 \\\\0 && 0 && 1 && 4 \end{bmatrix}
+ \begin{bmatrix} B_1 \\\\ B_2 \\\\ B_3 \\\\ B_4 \end{bmatrix}
+ =
+ \begin{bmatrix} (6 S_1 - S_0) \\\\ 6S_2 \\\\ 6 S_3 \\\\ (6S_4 - S_5) \end{bmatrix}
+
+A priori, il n'existe pas de librairie pour faire de la réduction de matrice en
+javascript, mais l'avantage d'utiliser OCaml est d'avoir sous la main `quelques
+librairies`_ permettant de faire le boulot directement.
+
+.. _quelques librairies: https://github.com/kandluis/ocaml-matrix
+
+Ensuite, travailler le DOM. Vu que le site est statique, j'ai choisi de
+modifier la page directement à partir du code javascript. En ajoutant un
+élément, en retirant ceux dont je n'avais nécessité, cela permet de changer
+l'apparence directement pour se construire son application. Cela m'a permis de
+me plonger dans la librairie `brr`_ qui permet d'interagir avec la page via
+des évènements fonctionnels.
+
+.. _brr: https://erratique.ch/software/brr
+
+Enfin, les webWorkers_, qui sont des threads pouvant être lancés dans le code
+javascript. Dans l'application, je les utilise pour *lisser* la courbe une fois
+que celle-ci a été construite une première fois.
+
+.. _webworkers: https://developer.mozilla.org/fr/docs/Web/API/Web_Workers_API/Utilisation_des_web_workers
+
+Ce qu'il faudrait continuer
+===========================
+
+Il me manque tout un cadre mathématique pour aller plus loin, j'aurai par
+exemple besoin de déterminer l'extrémité_ exacte de la courbe afin de traiter
+ces cas de manière précise, et j'ai besoin de comprendre le code avant de m'y
+mettre…
+
+.. _extrémité: https://pomax.github.io/bezierinfo/#extremities
+
+Par conséquent, l'export SVG est un peu biaisé, on retrouve bien ce qui est
+affiché sur l'écran, mais cela donne quelque chose qui n'est pas vraiment
+éditable comme je l'aurai souhaité.
+
+Il faudrait aussi aller plus loin dans les mouvements de plumes, permettre des
+rotations locales, juste sur un segment et non pas sur la totalité du tracé,
+enfin des petits ajustements pour qu'il y ait vraiment une plus-value.
+
+D'autres pistes
+===============
+
+Cela m'a aussi donné d'autres pistes pour continuer avec javascript et le blog.
+En utilisant l'API `Web Storage`_, on peut également stocker des données comme
+si l'on travaillait sur un fichier, les données étant stockées dans l'espace du
+navigateur. En combinant cela avec le côté statique du site, je pense à une
+page de prise de note, qui dont le code serait uniquement exécuté dans le
+navigateur, sans avoir besoin de serveur comme support.
+
+.. _web storage: https://developer.mozilla.org/fr/docs/Web/API/Web_Storage_API
+
+Le blog offrant un espace dans lequel je peux mettre en ligne mes applications,
+cela me donne envie de continuer et m'en servir comme petit terrain
+d'exipérimentation…
diff --git a/content/pages/script.it/script.js b/content/pages/script.it/script.js
new file mode 100755
index 0000000..337c80c
--- /dev/null
+++ b/content/pages/script.it/script.js
@@ -0,0 +1,3286 @@
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diff --git a/content/pages/script.it/script.rst b/content/pages/script.it/script.rst
new file mode 100755
index 0000000..39617e1
--- /dev/null
+++ b/content/pages/script.it/script.rst
@@ -0,0 +1,26 @@
+.. -*- mode: rst -*-
+.. -*- coding: utf-8 -*-
+
+Ardoise calligraphique
+======================
+
+:status: hidden
+:save_as: pages/script.it/index.html
+:url: pages/script.it
+
+.. raw:: html
+
+ <noscript>Sorry, you need to enable JavaScript to see this page.</noscript>
+ <script id="drawer_js" type="text/javascript" defer="defer" src="{static}script.js"></script>
+ <script>
+ var script = document.getElementById('drawer_js');
+ script.addEventListener('load', function() {
+ var app = document.getElementById('slate');
+ drawer.run(app);
+ });
+ </script>
+ <section class="todoapp" id="app">
+ <canvas id="slate" class="drawing-zone" width="800" height="800">
+ </section>
+
+Cliquez dans l'ardoise pour commencer à dessiner !
diff --git a/content/pages/script.it/worker.js b/content/pages/script.it/worker.js
new file mode 100755
index 0000000..32d6514
--- /dev/null
+++ b/content/pages/script.it/worker.js
@@ -0,0 +1,2351 @@
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