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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.lineTo()
+slug: Web/API/CanvasRenderingContext2D/lineTo
+translation_of: Web/API/CanvasRenderingContext2D/lineTo
+---
+<div>{{APIRef}}</div>
+
+<p>Canvas 2D API の <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.lineTo()</code></strong> メソッドは、直線でサブパスの終点を <code>x</code> と <code>y</code> の座標へ接続します(この線は実際には描画されません)。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox">void <var><em>ctx</em>.lineTo(x, y);</var>
+</pre>
+
+<h3 id="引数">引数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>線の終点の x 座標。</dd>
+ <dt><code>y</code></dt>
+ <dd>線の終点の y 座標。</dd>
+</dl>
+
+<h2 id="例">例</h2>
+
+<h3 id="lineTo_メソッドを使う"><code>lineTo</code> メソッドを使う</h3>
+
+<p>これは lineTo メソッドを使った実にシンプルなコード断片です。{{domxref("CanvasRenderingContext2D.beginPath", "beginPath()")}} を使って直線を描くパスを開始し 、ペンを {{domxref("CanvasRenderingContext.moveTo", "moveTo()")}} で動かし、そして {{domxref("CanvasRenderingContext2D.stroke", "stroke()")}} メソッドを使って実際に線を描画します。</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:[6]">var canvas = document.getElementById("canvas");
+var ctx = canvas.getContext("2d");
+
+ctx.beginPath();
+ctx.moveTo(50,50);
+ctx.lineTo(100, 100);
+ctx.stroke();
+</pre>
+
+<p>下のコードを編集して、変更が canvas に直に反映されることを確認してください。</p>
+
+<div style="display: none;">
+<h6 id="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="Edit" /&gt;
+  &lt;input id="reset" type="button" value="Reset" /&gt;
+&lt;/div&gt;
+&lt;textarea id="code" class="playable-code"&gt;
+ctx.beginPath();
+ctx.moveTo(50,50);
+ctx.lineTo(100, 100);
+ctx.stroke();&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="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">仕様</th>
+ <th scope="col">状態</th>
+ <th scope="col">コメント</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML WHATWG', "scripting.html#dom-context-2d-lineto", "CanvasRenderingContext2D.lineTo")}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td> </td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザ互換性">ブラウザ互換性</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}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</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>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参考情報">参考情報</h2>
+
+<ul>
+ <li>このメソッドを定義しているインターフェイス: {{domxref("CanvasRenderingContext2D")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.moveTo()")}}</li>
+ <li>{{domxref("CanvasRenderingContext2D.stroke()")}}</li>
+</ul>