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authorjulieng <julien.gattelier@gmail.com>2021-10-02 17:20:14 +0200
committerSphinxKnight <SphinxKnight@users.noreply.github.com>2021-10-02 17:30:20 +0200
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+---
+title: CanvasRenderingContext2D.beginPath()
+slug: Web/API/CanvasRenderingContext2D/beginPath
+tags:
+ - API
+ - Canvas
+ - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/beginPath
+---
+<div>{{APIRef}}</div>
+
+<p>La méthode <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.beginPath()</code></strong> de l'API Canvas 2D permet de commencer un nouveau chemin<em> e</em>n vidant la liste des sous-chemins. Appelez cette méthode quand vous voulez créer un nouveau chemin.</p>
+
+<h2 id="Syntaxe">Syntaxe</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.beginPath();</var>
+</pre>
+
+<h2 id="Exemples">Exemples</h2>
+
+<h3 id="Utiliser_la_méthode_beginPath">Utiliser la méthode <code>beginPath</code></h3>
+
+<p>Ceci est un simple snippet de code qui utilise la méthode <code>beginPath</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">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+// Premier chemin
+ctx.beginPath();
+ctx.strokeStyle = 'blue';
+ctx.moveTo(20, 20);
+ctx.lineTo(200, 20);
+ctx.stroke();
+
+// Second chemin
+ctx.beginPath();
+ctx.strokeStyle = 'green';
+ctx.moveTo(20, 20);
+ctx.lineTo(120, 120);
+ctx.stroke();
+</pre>
+
+<p>Éditez le code ci-dessous pour voir vos changements directemment apportés au canvas:</p>
+
+<h4 id="code_jouable">Code jouable</h4>
+
+<pre class="brush: html hidden">&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" style="height:200px"&gt;
+// First path
+ctx.beginPath();
+ctx.strokeStyle = 'blue';
+ctx.moveTo(20,20);
+ctx.lineTo(200,20);
+ctx.stroke();
+
+// Second path
+ctx.beginPath();
+ctx.strokeStyle = 'green';
+ctx.moveTo(20,20);
+ctx.lineTo(120, 120);
+ctx.stroke();&lt;/textarea&gt;
+</pre>
+
+<pre class="brush: js hidden">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>
+
+<p>{{ EmbedLiveSample('code_jouable', 700, 460) }}</p>
+
+<h2 id="Spécifications">Spécifications</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Status</th>
+ <th scope="col">Comment</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-beginpath", "CanvasRenderingContext2D.beginPath")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Compatibilité_des_navigateurs">Compatibilité des navigateurs</h2>
+
+<p>{{Compat("api.CanvasRenderingContext2D.beginPath")}}</p>
+
+<h2 id="Voir_aussi">Voir aussi</h2>
+
+<ul>
+ <li>L'interface qui définit cette méthode, {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.closePath()")}}</li>
+</ul>