blob: 2b6dc94049c5441ca40265a86243339adcd3cf8e [file] [log] [blame]
<!DOCTYPE html>
<html>
<head>
<title>Lottie Filmstrip Capture</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="/lottie.js" type="text/javascript" charset="utf-8"></script>
<style type="text/css" media="screen">
body,
main,
.anim {
margin: 0;
padding: 0;
}
main {
display: flex;
width: 1000px;
height: 1000px;
flex-flow: row wrap;
}
</style>
</head>
<body>
<main>
<div class=anim></div>
</main>
<script type="text/javascript" charset="utf-8">
(function () {
const TILE_COUNT = 5; // Number of tiles in x or y direction.
const TARGET_SIZE = 1000; // Image size in pixels both x and y direction.
const PATH = '/lottie.json';
let renderer = 'svg';
let hash = window.location.hash;
if (hash) {
renderer = hash.slice(1);
}
// This global is used by puppeteer to determine if all tiles have finished drawing.
window._tileCount = 0;
// First load the animation for just a single tile
// so we can read out some values and calculate what
// the filmstrip should look like.
let anim = lottie.loadAnimation({
container: document.querySelector('.anim'),
renderer: renderer,
loop: false,
autoplay: true,
path: PATH,
rendererSettings: {
preserveAspectRatio:'xMidYMid meet'
},
});
anim.addEventListener('data_ready', (e) => {
// Once the first tile is loaded, calculate what
// the filmstrip should look like.
let animationData = anim.animationData;
let totalFrames = anim.totalFrames;
// t_rate mimics DMSrcSink.cpp::SkottieSrc::draw
let t_rate = 1.0 / (TILE_COUNT * TILE_COUNT - 1);
let main = document.querySelector('main');
// Clear out the first div now that our measurements are done.
main.firstElementChild.remove();
// Add in all the tiles.
for (let i = 0; i < TILE_COUNT*TILE_COUNT; i++) {
let div = document.createElement('div');
div.classList.add('anim');
div.style.width = (TARGET_SIZE / TILE_COUNT) + 'px';
div.style.height = (TARGET_SIZE / TILE_COUNT) + 'px';
main.appendChild(div);
// create a new animation for each tile. It is tempting to try having
// one animation and "clone" each frame, but that doesn't work
// because of how bodymovin cleans up the URLObjects that are the path
// data for the svgs.
// We can re-use the animationData to avoid having to hit the
// (local) network a bunch of times.
let anim = lottie.loadAnimation({
container: div,
renderer: renderer,
loop: false,
autoplay: false,
animationData: animationData,
rendererSettings: {
preserveAspectRatio:'xMidYMid meet'
},
});
let t = Math.max(Math.min(t_rate * i, 1.0), 0.0);
let seekToFrame = totalFrames * t;
if (seekToFrame >= totalFrames) {
// 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;
}
// don't need to wait for data_ready because it's instantly ready.
console.log(`t = ${t}, go to frame ${seekToFrame}`);
anim.goToAndStop(seekToFrame, true);
window._tileCount += 1;
}
});
})();
</script>
</body>
</html>