canvas_进度条_html/css_WEB-ITnose

<title> canvas 实例 </title><meta charset="utf-8"><canvas id="myCanvas" width="600" height="150">您的浏览器不支持canvas！</canvas><br><button onclick="Start();">Start</button><button onclick="Create();">Create</button>

回复讨论(解决方案)

   // 画圆,圆心是24,24,半径24,从角度0开始,画到2PI结束,最后一个参数是方向顺时针还是逆时针            cts.arc(x, y, radius,  Math.PI * 2,0, true);

   // 画圆,圆心是24,24,半径24,从角度0开始,画到2PI结束,最后一个参数是方向顺时针还是逆时针            cts.arc(x, y, radius,  Math.PI * 2,0, true);

这个可以逆时针，但我还是不知道怎么改我的代码

cts.arc(x, y, radius, Math.PI * 1.5, Math.PI * 1.5 - Math.PI * 2 * process / 100,true);

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">    <meta name="apple-mobile-web-app-capable" content="yes">    <meta name="apple-mobile-web-app-status-bar-style" content="black">    <meta name="apple-touch-fullscreen" content="yes">    <meta name="format-detection" content="telephone=no">    <meta name="HandheldFriendly" content="true">    <meta http-equiv="x-rim-auto-match" content="none">    <meta http-equiv="X-UA-Compatible" content="IE=edge">    <meta property="og:type" content="website">    <meta property="og:image" content="75 pix image">    <meta property="og:site_name" content="South China Morning Post">    <meta property="og:description" content="Make every day matter">    <!--<meta property="fb:page_id" content="">-->    <title></title>                            <base target="_blank">    <style type="text/css">        html {width: 100%; height: 100%;}        body {width: 100%; height: 100%; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;}        * {margin: 0; padding: 0;}        .splash {position: absolute; z-index: 999; display: table; width: 100%; height: 100%; background-color: #f3f0eb;}        .splash>.splash-inner {display: table-cell; text-align: center; vertical-align: middle;}        .splash h1,.splash h2,.splash h3 {font-weight: normal;}        .splash h3 {display: block; margin-top: 34px; font-size: 18px; color: #666; font-weight: lighter;}        .splash .loading-circle {position: relative; width: 204px; height: 204px; margin: auto;}        .splash .loading-circle>* {display: block; position: absolute; box-sizing: border-box; border-radius: 102px;}        .splash .loading-circle>canvas.bg {z-index: 1; width: 100%; height: 100%; border: 8px solid #ddd ;}        .splash .loading-circle>canvas.mask {z-index: 2; transform: rotate(-90deg); -webkit-transform: rotate(-90deg); -moz-transform: rotate(-90deg);}        .splash .loading-circle>p {z-index: 3;  width: 100%; height: 100%; text-align: center; line-height: 204px; font-size: 56px; font-weight: lighter; color: #999;}    </style><div class="splash" id="splash">    <div class="splash-inner">        <h2></h2>        <!--<h2>Make every day matter</h2>-->        <div class="loading-circle" id="loadingCircle">            <p><span id="loadedNum">0</span>%</p>            <canvas class="mask" id="loadingProgress" width="204" height="204"></canvas>            <canvas class="bg" width="204" height="204"></canvas>        </div>    </div></div>

仅改成 false 是不行的，效果不对
要这样

cts.arc(x, y, radius, Math.PI * 1.5,  -3 * Math.PI * 1.5 +  Math.PI * 2 * process / 100, false);