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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: CanvasRenderingContext2D.rotate()
+slug: Web/API/CanvasRenderingContext2D/rotate
+tags:
+ - API
+ - Cancas
+ - CanvasRenderingContext2D
+ - Méthode
+ - Reference
+translation_of: Web/API/CanvasRenderingContext2D/rotate
+---
+<div>{{APIRef}}</div>
+
+<p>La méthode <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.rotate()</code></strong><code> de l'API</code> Canvas 2D ajoute une rotation à la matrice de transformation. L'argument angle représente un angle de rotation horaire et il est exprimé en radians.</p>
+
+<h2 id="Syntaxe">Syntaxe</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.rotate(angle);</var>
+</pre>
+
+<p><img alt="" class="internal" src="https://mdn.mozillademos.org/files/233/Canvas_grid_rotate.png" style="float: right;"></p>
+
+<h3 id="Paramètres">Paramètres</h3>
+
+<dl>
+ <dt><code>angle</code></dt>
+ <dd>L'angle de rotation horaire en radians. Vous pouvez utiliser <code><em>degrés</em> * Math.PI / 180</code> si vous voulez faire la conversion à partir d'une valeur en degrés.</dd>
+</dl>
+
+<p>Le centre de la rotation est toujours l'origine du canevas. Pour changer le centre, il faudra déplacer le canevas en utilisant la méthode {{domxref("CanvasRenderingContext2D.translate", "translate()")}}.</p>
+
+<h2 id="Exemples">Exemples</h2>
+
+<h3 id="Utilisation_de_la_méthode_rotate">Utilisation de la méthode <code>rotate</code></h3>
+
+<p>Ceci est seulement un fragment de code simple qui utilise la méthode <code>rotate</code>.</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="brush: js; highlight:[4]">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+ctx.rotate(45 * Math.PI / 180);
+ctx.fillRect(70, 0, 100, 30);
+
+// réinitialise la matrice de transformation courante à la matrice identité
+ctx.setTransform(1, 0, 0, 1, 0, 0);
+</pre>
+
+<p>Modifiez le code ci-dessous et voyez vos changements mis à jour en temps réel dans le canevas:</p>
+
+<div style="display: none;">
+<h6 id="Playable_code">Playable code</h6>
+
+<pre class="brush: html">&lt;canvas id="canvas" width="400" height="200" class="playable-canvas"&gt;&lt;/canvas&gt;
+&lt;div class="playable-buttons"&gt;
+  &lt;input id="edit" type="button" value="Edit" /&gt;
+  &lt;input id="reset" type="button" value="Reset" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+ctx.rotate(45 * Math.PI / 180);
+ctx.fillRect(70,0,100,30);
+ctx.setTransform(1, 0, 0, 1, 0, 0);&lt;/textarea&gt;
+</pre>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+var textarea = document.getElementById("code");
+var reset = document.getElementById("reset");
+var edit = document.getElementById("edit");
+var code = textarea.value;
+
+function drawCanvas() {
+ ctx.clearRect(0, 0, canvas.width, canvas.height);
+ eval(textarea.value);
+}
+
+reset.addEventListener("click", function() {
+ textarea.value = code;
+ drawCanvas();
+});
+
+edit.addEventListener("click", function() {
+ textarea.focus();
+})
+
+textarea.addEventListener("input", drawCanvas);
+window.addEventListener("load", drawCanvas);
+</pre>
+</div>
+
+<p>{{ EmbedLiveSample('Playable_code', 700, 360) }}</p>
+
+<h2 id="Spécifications">Spécifications</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Spécification</th>
+ <th scope="col">Statut</th>
+ <th scope="col">Commentaire</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-rotate", "CanvasRenderingContext2D.rotate")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilité_navigateurs">Compatibilité navigateurs</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Chrome</th>
+ <th>Edge</th>
+ <th>Firefox (Gecko)</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Support de base</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Android</th>
+ <th>Chrome pour Android</th>
+ <th>Edge</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Support de base</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ <td>{{ CompatVersionUnknown() }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li>L'interface la définissant, {{domxref("CanvasRenderingContext2D")}}</li>
+</ul>