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- <!DOCTYPE html>
- <html>
- <head>
- <title>Lottie-Web Perf</title>
- <meta charset="utf-8" />
- <meta http-equiv="X-UA-Compatible" content="IE=egde,chrome=1">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <script src="/res/lottie.js" type="text/javascript" charset="utf-8"></script>
- <style type="text/css" media="screen">
- body {
- margin: 0;
- padding: 0;
- }
- </style>
- </head>
- <body>
- <main>
- <div style="width:1000px;height:1000px" class=anim></div>
- </main>
- <script type="text/javascript" charset="utf-8">
- (function () {
- const PATH = '/res/lottie.json';
- const RENDERER = 'svg';
- const MAX_FRAMES = 25;
- const MAX_LOOPS = 3;
- // Get total number of frames of the animation from the hash.
- const hash = window.location.hash;
- const totalFrames = hash.slice(1);
- console.log("Lottie has " + totalFrames + "total frames");
- // Load the animation with autoplay false. We will control which
- // frame to seek to and then will measure performance.
- let anim = lottie.loadAnimation({
- container: document.querySelector('.anim'),
- renderer: RENDERER,
- loop: false,
- autoplay: false,
- path: PATH,
- rendererSettings: {
- preserveAspectRatio:'xMidYMid meet'
- },
- });
- const t_rate = 1.0 / (MAX_FRAMES - 1);
- let frame = 0;
- let loop = 0;
- const drawFrame = () => {
- if (frame >= MAX_FRAMES) {
- // Reached the end of one loop.
- loop++;
- if (loop == MAX_LOOPS) {
- // These are global variables to talk with puppeteer.
- window._lottieWebDone = true;
- return;
- }
- // Reset frame to restart the loop.
- frame = 0;
- }
- let t1 = Math.max(Math.min(t_rate * frame, 1.0), 0.0);
- let seekToFrame = totalFrames * t1;
- if (seekToFrame >= totalFrames-1) {
- // bodymovin player sometimes draws blank when requesting
- // to draw the very last frame. Subtracting a small value
- // seems to fix this and make it draw the last frame.
- seekToFrame -= .001;
- }
- anim.goToAndStop(seekToFrame, true /* isFrame */);
- console.log("Used seek: " + (seekToFrame/totalFrames));
- frame++;
- window.requestAnimationFrame(drawFrame);
- };
- window.requestAnimationFrame(drawFrame);
- })();
- </script>
- </body>
- </html>
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