svg绘制圆弧（一）

来源：互联网发布：舒尔特表训练软件编辑：程序博客网时间：2024/05/18 02:23
转载地址：https://www.oschina.net/code/snippet_170216_54737
绘制圆弧案例：
<!DOCTYPE html><html><head>  <meta charset="utf-8">  <title>SVG Draw Arc</title>  <style media="screen">    .svgs{display: flex; flex-flow:row wrap; justify-content: space-around; width: 620px; margin: 0 auto;}    .svgs svg{width:300px; height:200px; background: #F2F2F2; margin-bottom: 10px;}  </style></head><body>  <div class="svgs">  <svg version="1.1" xmlns="http://www.w3.org/2000/svg">    <path d="M 150 0 L 150 200 M 0 100 L 300 100" stroke="#CCC" stroke-width="1" />    <path id="path1" d="" stroke="#000" fill="green" fill-opacity="1" />  </svg>  <svg version="1.1" xmlns="http://www.w3.org/2000/svg">    <path d="M 150 0 L 150 200 M 0 100 L 300 100" stroke="#CCC" stroke-width="1" />    <path id="path2" d="" stroke="#000" fill="green" fill-opacity="1" />  </svg>  <svg version="1.1" xmlns="http://www.w3.org/2000/svg">    <path d="M 150 0 L 150 200 M 0 100 L 300 100" stroke="#CCC" stroke-width="1" />    <path id="path3" d="" stroke="#000" fill="green" fill-opacity="1" />  </svg>  <svg version="1.1" xmlns="http://www.w3.org/2000/svg">    <path d="M 150 0 L 150 200 M 0 100 L 300 100" stroke="#CCC" stroke-width="1" />    <path id="path4" d="" stroke="#000" fill="green" fill-opacity="1" />  </svg></div></body><script type="text/javascript">  function changeArcDeg(path, d){    path.setAttribute("d", d);  }  function drawArcByRadiusDeg(startX, startY, r, deg, clockwise) {    var cw = typeof clockwise !== 'undefined' ? clockwise : 1;    var x = startX - r + r*Math.cos(deg*Math.PI/180);    var y = startY + (1===cw ? 1 : -1)*r*Math.sin(deg*Math.PI/180);    var bigOrSmall = deg > 180 ? 1 : 0;    var line = " L" + (startX - r) + " " + startY + " L"+startX + " " + startY + "Z";    return "M " + startX +" "+ startY + " A "+ r +" " + r + " 0 " + bigOrSmall + " " +cw+ " " + x + " " + y + line;  }  function run(pid, deg, clockwise){    var path = document.getElementById(pid);    var x = 200, y = 100, r = 50, add = 0===deg ? true : false;    setInterval(function(){      if(deg>360) deg -= 360;      if(deg<0) deg += 360;      path.setAttribute("d", drawArcByRadiusDeg(x, y, r, add ? deg++ : deg--, clockwise)) ;    }, 10);  }  window.onload = function(){    run('path1', 0, 1);    run('path2', 0, 0);    run('path3', 360, 0);    run('path4', 360, 1);  };</script></html>
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