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我想为自定义徽标制作动画，例如典型的进度圈（例如百分比）。因此，我创建了一个带有笔划的圆圈，并为 svg 徽标设置了一个剪辑路径。

我快完成了，但我需要将笔画动画的起点从左侧（参见代码）更改为顶部 - 或箭头旁边。这样进度就从箭头之一开始。stroke-dasharray 和 stroke-dashoffset 的不同值将不起作用。

<html>
<head>
    <title></title>
  <style type="text/css">
  path.progress-logo {
    stroke-dasharray: 204.243;
    stroke-dashoffset: 122.763;
  }
</style>
</head>
<body>
<svg id="svg2">

<path fill="#E2E2E1" d="M100,39.414L81.975,21.982L63.89,39.414h9.86v30.97H17.164V23.659h42.563l-0.033,11.304l18.028-17.729
  L59.799-0.28l-0.031,10.737H18.281c-7.164,0-12.001,1.232-14.512,3.702C1.257,16.627,0,21.212,0,27.917v38.904
  c0,6.752,1.257,11.35,3.768,13.794c2.511,2.443,7.348,3.665,14.512,3.665h54.283c7.165,0,12.003-1.222,14.514-3.665
  c2.511-2.444,3.769-7.042,3.769-13.794V39.414H100z"/>

  <defs>
    <clipPath id="cut-off-bottom">
<path fill="#E2E2E1" d="M100,39.414L81.975,21.982L63.89,39.414h9.86v30.97H17.164V23.659h42.563l-0.033,11.304l18.028-17.729
  L59.799-0.28l-0.031,10.737H18.281c-7.164,0-12.001,1.232-14.512,3.702C1.257,16.627,0,21.212,0,27.917v38.904
  c0,6.752,1.257,11.35,3.768,13.794c2.511,2.443,7.348,3.665,14.512,3.665h54.283c7.165,0,12.003-1.222,14.514-3.665
  c2.511-2.444,3.769-7.042,3.769-13.794V39.414H100z"/>
    </clipPath>
  </defs>
  <path class="progress-logo" d="m0.66666,46.55556c0,-22.98956 18.62155,-41.61111 41.61111,-41.61111c22.98957,0 41.61111,18.62155 41.61111,41.61111c0,22.98956 -18.62154,41.61111 -41.61111,41.61111c-22.98956,0 -41.61111,-18.62155 -41.61111,-41.61111z" clip-path="url(#cut-off-bottom)" stroke-width="40" fill="none" stroke="#1ECD97"  />



</svg>

</body>
</html>

这是我当前的代码：http: //jsfiddle.net/w5huatyf/

谢谢你的帮助！

4

1 回答 1

1

你的答案在这里：

http://jsfiddle.net/w5huatyf/2/

function polarToCartesian(centerX, centerY, radius, angleInDegrees) {
  var angleInRadians = (angleInDegrees-90) * Math.PI / 180.0;

  return {
    x: centerX + (radius * Math.cos(angleInRadians)),
    y: centerY + (radius * Math.sin(angleInRadians))
  };
}

function describeArc(x, y, radius, startAngle, endAngle){

    var start = polarToCartesian(x, y, radius, endAngle);
    var end = polarToCartesian(x, y, radius, startAngle);

    var arcSweep = endAngle - startAngle <= 180 ? "0" : "1";

    var d = [
        "M", start.x, start.y, 
        "A", radius, radius, 0, arcSweep, 0, end.x, end.y,
        "L", x,y,
        "L", start.x, start.y
    ].join(" ");

    return d;       
}

var percent = 0;
var startValue = 43;
var endValue = 360+startValue-0.01;
function count(){
    if(percent < startValue)
    percent = startValue;
    else
        percent++;
    if(percent > endValue)
        percent = endValue;
    document.getElementById("arc1").setAttribute("d", describeArc(50, 50, 60, startValue, percent)); 
   document.getElementById("vals").innerHTML = percent + ' Degree';
    if(percent < endValue)
    window.setTimeout(function() {  count(); }, 30);
}

window.setTimeout(function() {  count( ); }, 30);

count(0,359);

这是一个简单的计时器，每次使用计时器替换弧值。

我使用了其他一些答案。这里有一些：

计时器：https ://stackoverflow.com/a/33676171/2655623 （我自己回答）

画饼图：https ://stackoverflow.com/a/24569190/2655623 （结果对我不起作用，但功能很有用）

如果您需要帮助解释代码，请告诉我。

于 2015-11-13T09:01:20.720 回答