HTML canvas scale() 方法

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Galu</button></a> </div> <h1>HTML canvas scale() 方法</h1> <div class="backtoreference"> <p><a href="/ha/tags/html_ref_canvas.html">HTML5 Canvas 参考手册</a></p> </div> <div> <h2>定义和用法</h2> <p><code>scale()</code> 方法缩放当前绘图，更大或更小。</p> <p class="note"><span>注释：</span>如果您对绘图进行缩放，所有之后的绘图也会被缩放。定位也会被缩放。如果您写 <code>scale(2,2)</code>，那么绘图将定位于距离画布左上角两倍远的位置。</p> </div> <div> <h2>实例</h2> <h3>例子 1</h3> <p>绘制矩形，放大到 200%，然后再次绘制矩形：</p> <canvas id="myCanvas" class="canvas_example"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas"); var canvOK=1; try {c.getContext("2d");} catch (er) {canvOK=0;} if (canvOK==1) { var ctx=c.getContext("2d"); 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>ctx.scale(2,2);</mark> ctx.strokeRect(5,5,25,15); </pre> <p class="tiy"><a target="_blank" href="/ha/tiy/t.html?f=eg_html5_canvas_scale">亲自试一试</a></p> <p class="tip"><span>提示：</span>页面底部提供更多实例。</p> </div> <div> <h2>语法</h2> <pre>context.scale(<i>scalewidth</i>,<i>scaleheight</i>);</pre> <h3>参数值</h3> <table class="dataintable"> <tr> <th style="width:25%;">参数</th> <th>描述</th> </tr> <tr> <td><i>scalewidth</i></td> <td>缩放当前绘图的宽度 (1=100%, 0.5=50%, 2=200%, 依次类推)。</td> </tr> <tr> <td><i>scaleheight</i></td> <td>缩放当前绘图的高度 (1=100%, 0.5=50%, 2=200%, 等等)。</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="/ha/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>注释：</span>Internet Explorer 8 以及更早的版本不支持 <canvas> 元素。</p> </div> <div class="backtoreference"> <p><a href="/ha/tags/html_ref_canvas.html">HTML5 Canvas 参考手册</a></p> </div><div style="background-color:#fcfdf8; padding:0;"> </div> </div>  <div id="sidebar"> <div><h3><center> 工具箱 </center><h3> <h5 id="tools_reference"><a href="/ha/tags/index.html">HTML 参考手册</a></h5> <h5 id="tools_example"><a href="/ha/html/html_examples.html">HTML 实例</a></h5> <h5 id="tools_quiz"><a href="/ha/html/html_quiz.html">HTML 测验</a></h5> <h5 id="tools_tutorial"><a href="/ha/html/index.html">HTML 教程</a></h5> </div> <div><h3><center> 赞助商链接 </center><h3> <div id="sbtg"> <script src="/myjs/zzsr.js"></script> </div> </div> </div> <div id="footer"> <p id="p1"> CodeW3C.com 提供的内容仅用于培训和测试，不保证内容的正确性。通过使用本站内容随之而来的风险与本站无关。版权所有，保留一切权利。 </p> <p id="p2"> <a href="/ha/about/index.html" title="Tanada CodeW3C.com">Tanada CodeW3C.com</a> <a href="/ha/about/about_helping.html" title="Yararrin CodeW3C.com">Yararrin CodeW3C.com</a> <a 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