{"id":418,"date":"2018-08-24T14:52:19","date_gmt":"2018-08-24T12:52:19","guid":{"rendered":"https:\/\/www.mathweb.fr\/euclide\/?p=418"},"modified":"2018-09-13T13:40:55","modified_gmt":"2018-09-13T11:40:55","slug":"creer-des-animations-gif-avec-geogebra","status":"publish","type":"post","link":"https:\/\/www.mathweb.fr\/euclide\/2018\/08\/24\/creer-des-animations-gif-avec-geogebra\/","title":{"rendered":"Cr\u00e9er des animations GIF avec Geogebra : mission impossible ?"},"content":{"rendered":"

Geogebra n’est plus \u00e0 pr\u00e9senter. Ce logiciel de g\u00e9om\u00e9trie (entre autre) permet quelque fois de pr\u00e9senter en cours des choses plut\u00f4t sympas.<\/p>\n

Dans cet article, je vais prendre pour pr\u00e9texte une activit\u00e9 que j’avais propos\u00e9e \u00e0 mes \u00e9l\u00e8ves de 6\u00e8me afin de cr\u00e9er une animation et au final, un Gif.<\/p>\n

<\/p>\n

Faire appara\u00eetre une astro\u00efde<\/h1>\n

Voici un programme de construction :<\/p>\n

    \n
  1. Construire un cercle C de centre O et de rayon 4 cm.<\/li>\n
  2. Construire deux diam\u00e8tres perpendiculaires [AB] et [XY] de C .<\/li>\n
  3. Soit un point M sur C tel que\\( \\widehat{BOM} = 20^\\circ\\).\n
      \n
    1. Construire en trait l\u00e9ger la droite perpendiculaire \u00e0 [AB] passant par M; elle coupe [AB] en D.<\/li>\n
    2. Construire en trait l\u00e9ger la droite perpendiculaire \u00e0 [XY] passant par M; elle coupe [XY] en E.<\/li>\n<\/ol>\n<\/li>\n
    3. Tracer en trait l\u00e9ger [DE].<\/li>\n
    4. Tracer en trait l\u00e9ger la droite perpendiculaire \u00e0 [DE] passant par M; elle coupe [DE] en P. Marquer uniquement le point P en rouge sans indiquer son nom.<\/li>\n
    5. Prendre d\u2019autres points M sur C en allant par exemple de 10\u00b0 en 10\u00b0 jusqu’\u00e0 90\u00b0 puis construire pour chacun d’eux le point P. En prenant le sym\u00e9triques des points obtenus par rapport \u00e0 (AB) et (XY), puis en les reliant, on obtient une astro\u00efde.<\/li>\n<\/ol>\n

      Ici, on voit que la variable qui change de valeur est l’angle\u00a0\\( \\widehat{BOM} \\); c’est donc cet angle qui va \u00eatre consid\u00e9r\u00e9 comme un curseur sur Geogebra.<\/p>\n

      Pour cela, une fois que l’on a trac\u00e9 [AB] et [CD] ainsi que le cercle, on cr\u00e9\u00e9 un curseur (nomm\u00e9 par exemple\u00a0a<\/em>) en pr\u00e9cisant que c’est un angle et que sa valeur varie entre 0\u00b0 et 360\u00b0 avec un pas de 1\u00b0 (\u00e0 l’ordinateur, on peut se permettre de prendre un pas inf\u00e9rieur \u00e0 10\u00b0 et de faire varier l’angle jusqu’\u00e0 360\u00b0).<\/p>\n

      On devrait voir, \u00e0 la fin de l’animation, ceci (j’ai remis le curseur\u00a0 \u00e0 0\u00b0 mais peu importe) :<\/p>\n

      \"construction<\/a><\/p>\n

      En revanche, pour exporter en Gif, Geogebra est devenu une grosse merde ! Depuis la version 6, je n’aime plus du tout ce logiciel. Il n’est pas du tout pratique. C’est la raison pour laquelle j’utilise \\(\\LaTeX\\).<\/p>\n

      Cr\u00e9er des Gifs avec \\(\\LaTeX\\) peut s’av\u00e9rer peut-\u00eatre plus long mais bien plus pratique !<\/p>\n

       <\/p>\n","protected":false},"excerpt":{"rendered":"

      Geogebra n’est plus \u00e0 pr\u00e9senter. Ce logiciel de g\u00e9om\u00e9trie (entre autre) permet quelque fois de pr\u00e9senter en cours des choses plut\u00f4t sympas. Dans cet article, je vais prendre pour pr\u00e9texte une activit\u00e9 que j’avais propos\u00e9e \u00e0 mes \u00e9l\u00e8ves de 6\u00e8me afin de cr\u00e9er une animation et au final, un Gif.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,4,6],"tags":[27],"class_list":["post-418","post","type-post","status-publish","format-standard","hentry","category-enseignement","category-informatique","category-mathematiques","tag-geogebra"],"yoast_head":"\nCr\u00e9er des animations GIF avec Geogebra : mission impossible ? - Mathweb.fr<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mathweb.fr\/euclide\/2018\/08\/24\/creer-des-animations-gif-avec-geogebra\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cr\u00e9er des animations GIF avec Geogebra : mission impossible ? - Mathweb.fr\" \/>\n<meta property=\"og:description\" content=\"Geogebra n’est plus \u00e0 pr\u00e9senter. 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