examples/test_anim.html from spritejs/spritejs

examples/test_anim.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>Document</title>
  <script src="/js/spritejs.js"></script>
  <style>
    #container {
      position: absolute;
      width: 600px;
      height: 600px;
    }
    #block {
      display: inline-block;
      width: 100px;
      height: 100px;
      background: red;
      position: absolute;
    }
  </style>
</head>
<body>
  <div id="block"></div>
  <div id="container"></div>
  <script>
    const container = document.getElementById('container');
    const scene = new spritejs.Scene({
      container,
      width: 600,
      height: 600,
      autoRender: false,
      // contextType: '2d',
    });
    const fglayer = scene.layer('fglayer');

    const s = new spritejs.Sprite({
      anchor: 0.5,
      pos: [300, 300],
      size: [100, 100],
      bgcolor: 'red',
    });
    fglayer.append(s);

    requestAnimationFrame(function update(t) {
      fglayer.render();
      requestAnimationFrame(update);
      // const block = document.getElementById('block');
      // block.style.left = Math.random() * 100 + 'px';
    });
  </script>
</body>
</html>