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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/ja/web/api/canvasrenderingcontext2d/direction | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/ja/web/api/canvasrenderingcontext2d/direction/index.html b/files/ja/web/api/canvasrenderingcontext2d/direction/index.html new file mode 100644 index 0000000000..4e0e4d2885 --- /dev/null +++ b/files/ja/web/api/canvasrenderingcontext2d/direction/index.html @@ -0,0 +1,177 @@ +--- +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"><canvas id="canvas"></canvas> +</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"><canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> +<div class="playable-buttons"> + <input id="edit" type="button" value="編集" /> + <input id="reset" type="button" value="リセット" /> +</div> +<textarea id="code" class="playable-code"> +ctx.font = "48px serif"; +ctx.direction = "ltr"; +ctx.strokeText("Hello world", 0, 100);</textarea> +</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> |