---
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>