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+---
+title: CanvasRenderingContext2D.ellipse()
+slug: Web/API/CanvasRenderingContext2D/ellipse
+tags:
+  - API
+  - Canvas
+  - CanvasRenderingContext2D
+translation_of: Web/API/CanvasRenderingContext2D/ellipse
+---
+<div>{{APIRef}} {{SeeCompatTable}}</div>
+
+<p><code><strong>CanvasRenderingContext2D</strong></code><strong><code>.ellipse()</code></strong> 是 Canvas 2D API 添加椭圆路径的方法。椭圆的圆心在（x,y）位置，半径分别是<em>radiusX</em> 和 <em>radiusY</em> ，按照<em>anticlockwise</em>（默认顺时针）指定的方向，从 <em>startAngle </em> 开始绘制，到 <em>endAngle</em> 结束。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate">void <var><em>ctx</em>.ellipse(x, y, radiusX, radiusY, rotation, startAngle, endAngle, anticlockwise);</var>
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>椭圆圆心的 x 轴坐标。</dd>
+ <dt><code>y</code></dt>
+ <dd>椭圆圆心的 y 轴坐标。</dd>
+ <dt><code>radius</code>X</dt>
+ <dd>椭圆长轴的半径。</dd>
+ <dt><code>radius</code>Y</dt>
+ <dd>椭圆短轴的半径。</dd>
+ <dt><code>rotation</code></dt>
+ <dd>椭圆的旋转角度，以弧度表示(<strong>非角度度数</strong>)。</dd>
+ <dt><code>startAngle</code></dt>
+ <dd>将要绘制的起始点角度，从 x 轴测量，以弧度表示(<strong>非角度度数</strong>)。</dd>
+ <dt><code>endAngle</code></dt>
+ <dd>椭圆将要绘制的结束点角度，以弧度表示(<strong>非角度度数</strong>)。</dd>
+ <dt><code>anticlockwise</code> {{optional_inline}}</dt>
+ <dd>{{jsxref("Boolean")}} 选项，如果为 <code>true</code>，逆时针方向绘制椭圆 （逆时针）， 反之顺时针方向绘制。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Using_the_ellipse_method" name="Using_the_ellipse_method">使用 <code>ellipse</code> 方法</h3>
+
+<p>这是一段绘制椭圆的简单的代码片段。</p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html notranslate">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<h4 id="JavaScript">JavaScript</h4>
+
+<pre class="notranslate"><code>var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+ctx.setLineDash([]);
+ctx.beginPath();
+ctx.ellipse(100, 100, 50, 75, 45 * Math.PI/180, 0, 2 * Math.PI); //倾斜45°角
+ctx.stroke();
+ctx.setLineDash([5]);
+ctx.moveTo(0,200);
+ctx.lineTo(200,0);
+ctx.stroke();</code></pre>
+
+<p>修改下面的代码并在线查看 canvas 的变化（如果椭圆没有绘制，请在兼容性列表中检查你的浏览器是否支持）：</p>
+
+<div style="display: none;">
+<h6 id="Playable_code" name="Playable_code">Playable code</h6>
+
+<pre class="brush: html notranslate">&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.setLineDash([]);
+ctx.beginPath();
+ctx.ellipse(100, 100, 50, 75, 45 * Math.PI/180, 0, 2 * Math.PI); //倾斜45°角
+ctx.stroke();
+ctx.setLineDash([5]);
+ctx.moveTo(0,200);
+ctx.lineTo(200,0);
+ctx.stroke();&lt;/textarea&gt;
+</pre>
+
+<pre class="brush: js notranslate">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="规范描述">规范描述</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-ellipse", "CanvasRenderingContext2D.ellipse")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.CanvasRenderingContext2D.ellipse")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>接口定义， {{domxref("CanvasRenderingContext2D")}}</li>
+</ul>