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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/lineto | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/ja/web/api/canvasrenderingcontext2d/lineto/index.html b/files/ja/web/api/canvasrenderingcontext2d/lineto/index.html new file mode 100644 index 0000000000..6929a63253 --- /dev/null +++ b/files/ja/web/api/canvasrenderingcontext2d/lineto/index.html @@ -0,0 +1,166 @@ +--- +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"><canvas id="canvas"></canvas> +</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"><canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> +<div class="playable-buttons"> + <input id="edit" type="button" value="Edit" /> + <input id="reset" type="button" value="Reset" /> +</div> +<textarea id="code" class="playable-code"> +ctx.beginPath(); +ctx.moveTo(50,50); +ctx.lineTo(100, 100); +ctx.stroke();</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="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> |