pages/play-with-scroll.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>PAG</title>
    <link rel="icon" href="https://pag.io/img/favicon.png" />
    <style>
      body {
        padding: 12px;
      }
      .header {
        height: 64px;
        border-bottom: 1px solid rgb(193, 193, 193);
        margin-bottom: 24px;
      }
      .context {
        height: 1600px;
      }
      .canvas {
        position: fixed;
        top: 80px;
        left: 360px;
      }
    </style>
  </head>
  <body>
    <div class="header">
      <img src="../assets/logo.png" alt="logo" width="133" height="48" />
    </div>
    <canvas class="canvas" id="pag"></canvas>
    <div class="context">Please scroll down to see the animation. -></div>
    <script src="https://cdn.jsdelivr.net/npm/libpag@latest/lib/libpag.min.js"></script>
    <script>
      window.onload = async () => {
        const pagUrl = '../assets/like.pag';
        // Initialize pag webassembly module.
        const PAG = await window.libpag.PAGInit();
        // Fetch pag file.
        const buffer = await fetch(pagUrl).then((response) => response.arrayBuffer());
        // Load the PAGFile from file.
        const pagFile = await PAG.PAGFile.load(buffer);
        // Set the width from the PAGFile.
        const canvas = document.getElementById('pag');
        canvas.width = pagFile.width();
        canvas.height = pagFile.height();
        // Create PAGView.
        const pagView = await PAG.PAGView.init(pagFile, canvas);

        // Set PAGView play with scroll.
        const animationLoop = () => {
          requestAnimationFrame(() => {
            animationLoop();
          });
          pagView.flush();
        };
        document.addEventListener('scroll', (ev) => {
          const progress =
            document.documentElement.scrollTop /
            (document.documentElement.scrollHeight - document.documentElement.clientHeight);
          console.log('progress', progress);
          pagView.setProgress(progress);
        });
        animationLoop();
      };
    </script>
  </body>
</html>