HTML canvas scale() 方法

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<pre class="language-js"> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.strokeRect(5,5,25,15); <mark>ctx.scale(2,2);</mark> ctx.strokeRect(5,5,25,15); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=eg_html5_canvas_scale">亲自试一试</a></p> <p class="tip"><span>Matokeo:</span>Mifano inayotolewa chini ya ukurasa.</p> </div> <div> <h2>Mwongozo</h2> <pre>context.scale(<i>scalewidth</i>,<i>scaleheight</i>);</pre> <h3>Chaguo cha paramaga</h3> <table class="dataintable"> <tr> <th style="width:25%;">Paramaga</th> <th>Maelezo</th> </tr> <tr> <td><i>scalewidth</i></td> <td>Kampua ukuruhusu eneo la kipindukindu (1=100%, 0.5=50%, 2=200%, na sio).</td> </tr> <tr> <td><i>scaleheight</i></td> <td>Kampua ukuruhusu umbo la kipindukindu (1=100%, 0.5=50%, 2=200%, na sio).</td> </tr> </table> </div> <div> <h2>更多实例</h2> <h3>例子 2</h3> <p>绘制一个矩形；放大到 200%，再次绘制矩形；放大到 200%，然后再次绘制矩形；放大到 200%，再次绘制矩形：</p> <canvas id="myCanvas2" width="300" height="170" style="border:1px solid #d3d3d3;background:#ffffff; margin-top: 15px"> Your browser does not support the HTML canvas tag. </canvas> <script> var c=document.getElementById("myCanvas2"); var ctx=c.getContext("2d"); ctx.strokeRect(5,5,25,15); ctx.scale(2,2); ctx.strokeRect(5,5,25,15); ctx.scale(2,2); ctx.strokeRect(5,5,25,15); ctx.scale(2,2); ctx.strokeRect(5,5,25,15); </script> <p>JavaScript:</p> <pre class="language-js"> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.strokeRect(5,5,25,15); <mark class="code_comment">ctx.scale(2,2);</mark> ctx.strokeRect(5,5,25,15); <mark class="code_comment">ctx.scale(2,2);</mark> ctx.strokeRect(5,5,25,15); <mark class="code_comment">ctx.scale(2,2);</mark> ctx.strokeRect(5,5,25,15); </pre> <p class="tiy"><a target="_blank" href="/sw/tiy/t.html?f=eg_html5_canvas_scale2">亲自试一试</a></p> </div> <div> <h2>浏览器支持</h2> <p>表中的数字注明了首个完全支持该属性的浏览器版本。</p> <table class="browser-support"> <tr> <th class="bsChrome">Chrome</th> <th class="bsEdge">Edge</th> <th class="bsFirefox">Firefox</th> <th class="bsSafari">Safari</th> <th class="bsOpera">Opera</th> </tr> <tr> <td>Chrome</td> <td>Edge</td> <td>Firefox</td> <td>Safari</td> <td>Opera</td> </tr> <tr> <td>4.0</td> <td>9.0</td> <td>3.6</td> <td>4.0</td> <td>10.1</td> </tr> </table> <p class="note"><span>Kumekadiri:</span>Internet Explorer 8 na kuzingatia huzungumza kina <canvas> kina.</p> </div> <div class="backtoreference"> <p><a href="/sw/tags/html_ref_canvas.html">Mwongozo wa HTML5 Canvas</a></p> </div><div style="background-color:#fcfdf8; padding:0;"> </div> </div>  <div id="sidebar"> <div><h3><center> Kitu cha vifaa </center><h3> <h5 id="tools_reference"><a href="/sw/tags/index.html">Mwongozo wa HTML</a></h5> <h5 id="tools_example"><a href="/sw/html/html_examples.html">Mifano ya HTML</a></h5> <h5 id="tools_quiz"><a href="/sw/html/html_quiz.html">Imitindo ya HTML</a></h5> <h5 id="tools_tutorial"><a href="/sw/html/index.html">Makala ya HTML</a></h5> </div> <div><h3><center> Vituo vya 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