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canvas绘制环形进度条

时间:2021-07-01 10:21:17 帮助过:7人阅读

效果如下:

代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/>
 <meta name="format-detection" content="telephone=no,email=no,date=no,address=no">
 <title>canvas绘制环形进度条</title>
 <style type="text/css">
 .chartbox{width: 100px;margin: 100px auto;}
 .myChart{width:100px;height: 100px;}
 </style>
</head>
<body>
 <div class="chartbox">
 <canvas class="myChart" id="myChart" width="100%" height="100%" data-total="100" data-curr="29.45"></canvas>
 </div>
 <script typet="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
 <script type="text/javascript">
 (function($, window, undefined) { 
  $.fn.ringChart = function(options) {
  var defaults = { };
  var settings = $.extend({}, defaults, options);
  var canvas = $(this).get(0);
  var total = $(this).attr("data-total");
  var curr = $(this).attr("data-curr");
  var constrast = parseFloat(curr/total).toFixed(2); //比例
  var context = null;
  if ( !canvas.getContext) {
   return;
  }
  // 定义开始点的大小
  var startArc = Math.PI*1.5;
  // 根据占的比例画圆弧
  var endArc = (Math.PI * 2) * constrast;
  context = canvas.getContext("2d");
  // 圆心文字
  context.font="28px Arial";
   context.fillStyle = '#ff801a';
 context.textBaseline = 'middle';
   var text=(Number(curr/total)*100).toFixed(0)+"%";
   var tw=context.measureText(text).width;
 context.fillText(text,50-tw/2,50);
  // 绘制背景圆 
  context.save();
  context.beginPath();
  context.strokeStyle = "#e7e7e7";
  context.lineWidth = "4";
  context.arc(50, 50, 44, 0, Math.PI * 2, false);
  context.closePath();
  context.stroke();
  context.restore();
   // 若为百分零则不必再绘制比例圆
   if ( curr / total == 0) {
   return;
   }
  // 绘制比例圆 
  context.save();
  context.beginPath();
  context.strokeStyle = "#ff801a";
  context.lineWidth = "4";
   context.arc(50, 50, 44, startArc, (curr % total == 0 ? startArc : (endArc+startArc)), false);
  context.stroke();
  context.restore();
  }
 })($, window);
 $("#myChart").ringChart();
 </script>
</body>
</html>

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