---
title: CanvasRenderingContext2D.strokeRect()
slug: Web/API/CanvasRenderingContext2D/strokeRect
tags:
  - API
  - Canvas
  - CanvasRenderingContext2D
  - Referencia
  - metodo
translation_of: Web/API/CanvasRenderingContext2D/strokeRect
---
<div>{{APIRef}}</div>

<p>O método <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.strokeRect()</code></strong> da API Canvas 2D desenha um retângulo na posição <em>(x, y)</em>, que possui uma largura<em> </em>(<em>width</em>) <em>w</em> e uma altura (<em>height</em>) <em>h</em><code>,</code> e não tem nenhum preenchimento (estilo <em>stroke</em>).</p>

<h2 id="Sintaxe">Sintaxe</h2>

<pre class="syntaxbox">void <var><em>ctx</em>.strokeRect(x, y, width, height);</var>
</pre>

<h3 id="Parâmetros">Parâmetros</h3>

<dl>
 <dt><code>x</code></dt>
 <dd>O valor da coordenada x para o ponto inicial do retângulo.</dd>
 <dt><code>y</code></dt>
 <dd>O valor da coordenada y para o ponto inicial do retângulo.</dd>
 <dt><code>width</code></dt>
 <dd>A largura do retângulo.</dd>
 <dt><code>height</code></dt>
 <dd>A altura do retângulo.</dd>
</dl>

<h2 id="Exemplos">Exemplos</h2>

<h3 id="Usando_o_método_strokeRect">Usando o método <code>strokeRect</code></h3>

<p>Isto é só um simples trecho de código que usa o método <code>strokeRect</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:[5]">var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

ctx.strokeStyle = 'green';
ctx.strokeRect(10, 10, 100, 100);
</pre>

<p>Edite o código abaixo e veja as alterações instantâneas no canvas:</p>

<div class="hidden">
<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.strokeStyle = "green";
ctx.strokeRect(10, 10, 100, 100);&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="Especificações">Especificações</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Especificação</th>
   <th scope="col">Estado</th>
   <th scope="col">Comentário</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-strokerect", "CanvasRenderingContext2D.strokeRect")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="Compatibilidade_em_Navegadores">Compatibilidade em Navegadores</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>Suporte básico</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 para 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>Suporte básico</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="Veja_também">Veja também</h2>

<ul>
 <li>A definição da interface {{domxref("CanvasRenderingContext2D")}}</li>
 <li>{{domxref("CanvasRenderingContext2D.strokeStyle")}}</li>
 <li>{{domxref("CanvasRenderingContext2D.clearRect()")}}</li>
 <li>{{domxref("CanvasRenderingContext2D.fillRect()")}}</li>
</ul>