Revision 724493 of CanvasRenderingContext2D.clearHitRegions()

<div>{{APIRef}} {{SeeCompatTable}}</div>

<p>Canvas 2D APIの<code><strong>CanvasRenderingContext2D</strong></code><strong><code>.clearHitRegions()</code></strong>メソッドはcanvasからすべてのヒット領域を削除します。</p>

<h2 id=".E6.A7.8B.E6.96.87">構文</h2>

<pre class="syntaxbox">
void <var><em>ctx</em>.clearHitRegions();</var>
</pre>

<h2 id=".E4.BE.8B">例</h2>

<h3 id="clearHitRegions.E3.83.A1.E3.82.BD.E3.83.83.E3.83.89.E3.82.92.E4.BD.BF.E3.81.86"><code>clearHitRegions</code>メソッドを使う</h3>

<p>これは、<code>clearHitRegions</code>メソッドを使った簡単なコードです。</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:[10]">
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");

// ヒット領域をいくつか指定
ctx.addHitRegion({id: "eyes"});
ctx.addHitRegion({id: "nose"});
ctx.addHitRegion({id: "mouth"});

// canvasからすべて削除
ctx.clearHitRegions();
</pre>

<h2 id=".E4.BB.95.E6.A7.98">仕様</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">仕様</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-clearhitregions", "CanvasRenderingContext2D.clearHitRegions")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>&nbsp;</td>
  </tr>
 </tbody>
</table>

<h2 id=".E3.83.96.E3.83.A9.E3.82.A6.E3.82.B6.E3.83.BC.E5.AE.9F.E8.A3.85.E7.8A.B6.E6.B3.81">ブラウザー実装状況</h2>

<p>{{CompatibilityTable}}</p>

<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}}<br />
    {{bug(1119527)}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</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>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
   <td>{{CompatNo}}</td>
  </tr>
 </tbody>
</table>
</div>

<h3 id=".E6.B3.A8.E8.A8.98">注記</h3>

<ul>
 <li>[1] この機能はフラグを変更しないと動作しません。有効にするには<code>ExperimentalCanvasFeatures</code>フラグを<code>true</code>に設定してください。</li>
</ul>

<h2 id=".E9.96.A2.E9.80.A3.E6.83.85.E5.A0.B1">関連情報</h2>

<ul>
 <li>{{domxref("CanvasRenderingContext2D.addHitRegion()")}} {{experimental_inline}}</li>
 <li>{{domxref("CanvasRenderingContext2D.removeHitRegion()")}} {{experimental_inline}}</li>
</ul>