From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: CanvasRenderingContext2D.direction
+slug: Web/API/CanvasRenderingContext2D/direction
+tags:
+  - API
+  - Canvas
+  - CanvasRenderingContext2D
+  - Experimental
+  - Property
+  - Reference
+translation_of: Web/API/CanvasRenderingContext2D/direction
+---
+<div>{{APIRef}} {{SeeCompatTable}}</div>
+
+<p>Canvas 2D API の <code><strong>CanvasRenderingContext2D.direction</strong></code> プロパティは、テキストを描画するときに使用する現在の書字方向を指定します。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox"><var><em>ctx</em>.direction = "ltr" || "rtl" || "inherit";</var>
+</pre>
+
+<h3 id="Options" name="Options">オプション</h3>
+
+<p>指定可能な値:</p>
+
+<dl>
+ <dt>ltr</dt>
+ <dd>テキストの書字方向を left-to-right にします。</dd>
+ <dt>rtl</dt>
+ <dd>テキストの書字方向を right-to-left にします。</dd>
+ <dt>inherit</dt>
+ <dd>テキストの書字方向は {{HTMLElement("canvas")}} 要素または {{domxref("Document")}} から適宜継承します。</dd>
+</dl>
+
+<p>デフォルト値は <code>inherit</code> です。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="Using_the_direction_property" name="Using_the_direction_property"><code>direction</code> プロパティの使用例</h3>
+
+<p>さまざまな書字方向を設定するために <code>direction</code> プロパティを使用する、シンプルなコードスニペットです。</p>
+
+<h4 id="HTML" name="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;canvas id="canvas"&gt;&lt;/canvas&gt;
+</pre>
+
+<h4 id="JavaScript" name="JavaScript">JavaScript</h4>
+
+<pre class="brush: js">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.font = "48px serif";
+ctx.direction = "ltr";
+ctx.strokeText("Hello world", 0, 100);
+</pre>
+
+<p>以下のコードを編集すると、canvas の変更個所をその場で確認できます:</p>
+
+<div class="hidden">
+<h6 id="Playable_code" name="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="編集" /&gt;
+  &lt;input id="reset" type="button" value="リセット" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+ctx.font = "48px serif";
+ctx.direction = "ltr";
+ctx.strokeText("Hello world", 0, 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="Specifications" name="Specifications">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-direction", "CanvasRenderingContext2D.direction")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザ実装状況</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatVersionUnknown}} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] この機能はデフォルトで無効化されています。有効化するには <code>ExperimentalCanvasFeatures</code> 機能フラグを使用します。</p>
+
+<h2 id="See_also" name="See_also">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>
+</ul>
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