Zdog：疑似3DのJavaScriptライブラリで光復節の太極旗を掲げる

<canvas class="zdog-canvas" width="240" height="240"></canvas>
<script src="https://unpkg.com/zdog@1/dist/zdog.dist.min.js"></script>
<script>
  const illo = new Zdog.Illustration({
    element: '.zdog-canvas',
    dragRotate: true, // drag to turn the scene
  });

  // a square, pushed back
  new Zdog.Rect({
    addTo: illo,
    width: 80,
    height: 80,
    translate: { z: -30 },
    stroke: 8,
    color: '#0047a0',
  });

  // a filled circle, pulled forward
  new Zdog.Ellipse({
    addTo: illo,
    diameter: 60,
    translate: { z: 30 },
    stroke: 8,
    color: '#cd2e3a',
    fill: true,
  });

  function animate() {
    illo.rotate.y += 0.02;
    illo.updateRenderGraph();
    requestAnimationFrame(animate);
  }
  animate();
</script>