examples/ray.html from spritejs/spritejs

examples/ray.html
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Quick Start</title>
  <script src='https://s2.ssl.qhres2.com/!87edaa34/animator-0.3.1.min.js'></script>
  <script src="/js/spritejs.js"></script>
  <style>
    html,body {
      margin: 0;
      padding: 0;
      background: #201e1e;
      height: 100%;
      width: 100%;
      max-width: 800px;
    }

    #stage {
      display: inline-block;
      width: 100%;
      height: 0;
      padding-bottom: 100%;
      background: #201e1e;
    }  
  </style>
</head>
<body>
  <div id="stage"></div>
  <script>
    function sleep(ms) {
      return new Promise((resolve) => {
        setTimeout(resolve, ms);
      });
    }

    (async function () {
      /* globals Animator */
      const {Scene, Path, Gradient} = spritejs;
      const container = document.getElementById('stage');
      const scene = new Scene({
        container,
        width: 1600,
        height: 1200,
        mode: 'stickyWidth',
      });

      async function ray() {
        const s = new Path();

        const pos = [200 + 1200 * Math.random(), 200 + 800 * Math.random()];
        const rotate = 360 * Math.random();
        const controller = Math.random() * 340 + 10;

        const color = [127 + 128 * Math.random(), 255 * Math.random(), 128 * Math.random()].map(Math.round);

        s.attr({
          pos,
          rotate,
          lineWidth: 6,
          d: `M10,80 q${controller},-80 350,0`,
        });

        scene.layer().append(s);


        const a1 = new Animator(3000, (p) => {
          let q = 0;

          if(p > 0.618) {
            q = 1 - (1 - p) / 0.382;
          }

          p = Math.min(p / 0.7, 1);

          const colors = [
            {offset: 0, color: `rgba(${color[0]},${color[1]},${color[2]},0)`},
            {offset: q, color: `rgba(${color[0]},${color[1]},${color[2]},0)`},
            {offset: p, color: `rgba(${color[0]},${color[1]},${color[2]},1)`},
            {offset: Math.min(p + 0.06, 1), color: `rgba(${color[0]},${color[1]},${color[2]},0)`},
          ];

          const len = s.getPathLength();
          const [x, y] = s.getPointAtLength(p * len);
          const vector = [0, 0, x + 5, y];

          const gradient = new Gradient({
            vector,
            colors,
          });

          s.attr({strokeColor: gradient});
        });

        await a1.animate();
        s.remove();
      }

      do {
        ray();
        const delay = Math.random() * 500 + 200;
        await sleep(delay); // eslint-disable-line no-await-in-loop
      } while(1);
    }());
  </script>
</body>
</html>