examples/group_filters.html from spritejs/spritejs

examples/group_filters.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="/js/spritejs.js"></script>
  <script src="//lib.baomitu.com/dat-gui/0.7.2/dat.gui.min.js"></script>
  <style>
    html,body {
      margin: 0;
      padding: 0;
      height: 100%;
      width: 100%;
      max-width: 800px;
    }

    #stage {
      display: inline-block;
      width: 100%;
      height: 0;
      padding-bottom: 100%;
    }  
  </style>
</head>
<body>
  <div id="stage"></div>
  <script>
    const {Scene, Sprite, Group, Arc} = spritejs;
    const container = document.getElementById('stage');
    const scene = new Scene({
      container,
      width: 1200,
      height: 1200,
    });

    const textureURL = 'https://p4.ssl.qhimg.com/t012170360e1552ce17.png';

    const layer = scene.layer('fglayer');

    const group = new Group();
    group.name = 'group';
    group.attr({
      pos: [600, 600],
      filter: 'grayscale(100%)',
    });
    layer.append(group);

    const sprite = new Sprite({
      anchor: 0.5,
      texture: textureURL,
      // filter: 'grayscale(0.5)',
    });
    group.append(sprite);

    const c = new Arc({
      radius: 50,
      fillColor: 'blue',
      pos: [200, 200],
    });
    group.append(c);

    layer.append(group);
  </script>
</body>
</html>