svg绘制圆弧

时间：2024-06-04 19:06:26
<!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>

svg绘制圆弧

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