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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.measureText()
+slug: Web/API/CanvasRenderingContext2D/measureText
+tags:
+ - API
+ - Canvas
+ - CanvasRenderingContext2D
+ - Method
+ - Reference
+ - Référence(2)
+translation_of: Web/API/CanvasRenderingContext2D/measureText
+---
+<div>{{APIRef}}</div>
+
+<p><code><strong>CanvasRenderingContext2D.measureText()</strong></code> メソッドは、測定したテキストの情報 (例えば幅など) を持つ {{domxref("TextMetrics")}} オブジェクトを返します。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">TextMetrics <var><em>ctx</em></var>.measureText(text);</pre>
+
+<h3 id="引数">引数</h3>
+
+<dl>
+ <dt>text</dt>
+ <dd>測定する文字列。</dd>
+</dl>
+
+<h3 id="戻り値">戻り値</h3>
+
+<p>{{domxref("TextMetrics")}} オブジェクト。</p>
+
+<h2 id="例">例</h2>
+
+<p>以下の {{HTMLElement("canvas")}} 要素があるとします:</p>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<p>以下のコードを使用して {{domxref("TextMetrics")}} オブジェクトを得ることができます:</p>
+
+<pre class="brush: js">var canvas = document.getElementById('canvas');
+var ctx = canvas.getContext('2d');
+
+var text = ctx.measureText("foo"); // TextMetrics オブジェクト
+text.width; // 16;
+</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様書</th>
+ <th scope="col">策定状況</th>
+ <th scope="col">コメント</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-measuretext", "CanvasRenderingContext2D.measureText")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザ実装状況">ブラウザ実装状況</h2>
+
+
+
+<p>{{Compat("api.CanvasRenderingContext2D.measureText")}}</p>
+
+<h2 id="関連情報">関連情報</h2>
+
+<ul>
+ <li>このメソッドを定義するインターフェイスである {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("TextMetrics")}}</li>
+</ul>