SVG/trace.html at master · OrangeTreeDev/SVG · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="jquery-3.1.1.min.js"></script>
    <script type="text/javascript" src="snap.svg-min.js"></script>
    <style type="text/css">
        html, body{
            width: 100%;
            height: 100%;
        }

        svg{
            width: 100%;
            height: 100%;
            background-color: gray;
        }

        #trace{
            stroke: red;
            stroke-width: 1px;
            fill: none;
        }

        #plane{
            stroke: rgba(255,255,255,0.8);
            stroke-width: 1;
            fill: rgba(255,255,255,0.5);
        }
    </style>
</head>
<body>
<svg id="svg">
    <path id="trace" d="M221.712,180.442C237.176,177.728,279.348,178.094,261,152c-18.742-26.654-48.543-28.207-63-22-14.981,6.431-34.763,6.357-34,40s66.09,74.162,88,68,60.358-23.742,67-49,14.211-59.957-27-81S163.688,88.664,153,98c-7.828,6.838-32.045,22.952-32,64,0.039,35.491,7.878,62.872,14,78s52.737,39.557,73,41,58.638,16.552,105-7c44.249-22.478,75.073-94.409,55-164C349.768,46.792,217.142,54.519,200,55S104.613,66.128,78,111c-16.922,28.532-16.5,96.616,1,134,14.482,30.932,51.88,58.52,68,64,39.988,13.593,100.081,21.615,129,17"
    ></path>
    <path id="plane" d="M219.712,169.046 L229.444 179.085 L224.042 191.838 z"></path>
</svg>
</body>
</html>
<script type="text/javascript">
    var snap = Snap('#svg');
    var trace = snap.select('#trace');
    var plane = snap.select('#plane');
    var length = trace.getTotalLength();
    var animation = function (){
        Snap.animate(0,length,function(val){
            var pt = Snap.path.getPointAtLength(trace, val); // getPointAtLength获取的坐标是绝对左边
            var matrix = new Snap.Matrix();
            var tx = pt.x - 221.712;
            var ty = pt.y - 180.442;
            matrix.translate(tx, ty); // tx，ty是横向与纵向的移动相对位置
            matrix.rotate(pt.alpha-180,221.712,180.442), // 默认旋转中心是（0,0），需要改成围绕物体的中心
                    plane.transform(matrix);
        }, 10000, mina.linear(), function(){
            animation();
        })
    }
    animation();

</script>