<canvas id="hero-lightpass" />
html {
height: 100vh;
}
body {
height: 500vh;
background: #000;
}
canvas {
position: fixed;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
max-width: 100vw;
max-height: 100vh;
}
const html = document.documentElement;
const canvas = document.getElementById("hero-lightpass");
const context = canvas.getContext("2d");
const frameCount = 148;
const currentFrame = index => (
`https://www.apple.com/105/media/us/airpods-pro/2019/1299e2f5_9206_4470_b28e_08307a42f19b/anim/sequence/large/01-hero-lightpass/${index.toString().padStart(4, '0')}.jpg`
)
const preloadImages = () => {
for (let i = 1; i < frameCount; i++) {
const img = new Image();
img.src = currentFrame(i);
}
};
const img = new Image()
img.src = currentFrame(1);
canvas.width=1158;
canvas.height=770;
img.onload=function(){
context.drawImage(img, 0, 0);
}
const updateImage = index => {
img.src = currentFrame(index);
context.drawImage(img, 0, 0);
}
window.addEventListener('scroll', () => {
const scrollTop = html.scrollTop;
const maxScrollTop = html.scrollHeight - window.innerHeight;
const scrollFraction = scrollTop / maxScrollTop;
const frameIndex = Math.min(
frameCount - 1,
Math.ceil(scrollFraction * frameCount)
);
requestAnimationFrame(() => updateImage(frameIndex + 1))
});
preloadImages()
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.