苹果AirPods Pro动画（GSAP）

前些天发现了一个人工智能学习网站，通俗易懂，风趣幽默，最重要的屌图甚多，忍不住分享一下给大家。点击跳转到网站。

先看一下展示效果，滚动鼠标中轴耳机的光效会逐渐变化：

代码也是很简单的一个图片替换，但重点是丝滑~：

<canvas id="hero-lightpass">canvas>

console.clear();

const canvas = document.getElementById("hero-lightpass");
const context = canvas.getContext("2d");

canvas.width = 1158;
canvas.height = 770;

const frameCount = 147;
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 + 1).toString().padStart(4, '0')}.jpg`
);

const images = []
const airpods = {
  frame: 0
};

for (let i = 0; i < frameCount; i++) {
  const img = new Image();
  img.src = currentFrame(i);
  images.push(img);
}

gsap.to(airpods, {
  frame: frameCount - 1,
  snap: "frame",
  ease: "none",
  scrollTrigger: {
    scrub: 0.5
  },
  onUpdate: render // use animation onUpdate instead of scrollTrigger's onUpdate
});

images[0].onload = render;

function render() {
  context.clearRect(0, 0, canvas.width, canvas.height);
  context.drawImage(images[airpods.frame], 0, 0); 
}

html {
  height: 100vh;
}

body {
  height: 5000px;
  background: #000;
}

canvas {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 100vw;
  max-height: 100vh;
}