Code Playground

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    <title>Document</title>
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<body>
    <a class="bear-link" href="https://twitter.com/intent/follow?screen_name=jh3yy" target="_blank" rel="noreferrer noopener">
  <svg class="w-9" viewBox="0 0 969 955" fill="none" xmlns="http://www.w3.org/2000/svg">
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<main></main>
<h1>scroll.</h1>
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@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
@import "normalize.css";

html {
	color-scheme: light only;
}

[data-dark="true"] {
	color-scheme: dark only;
}

*,
*:after,
*:before {
	box-sizing: border-box;
}

body {
	display: grid;
	place-items: center;
	min-height: 100svh;
	font-family:  "SF Pro Text", "SF Pro Icons", "AOS Icons", "Helvetica Neue", Helvetica, Arial, sans-serif, system-ui;
	overflow: hidden;
}

body::before {
	--size: 60px;
	--line: color-mix(in lch, canvasText 35%, hsl(0 0% 100% / 0.25));
	content: '';
	height: 100svh;
	width: 100vw;
	position: fixed;
	background: linear-gradient(
				90deg,
				var(--line) 1px,
				transparent 1px var(--size)
			)
			50% 50% / var(--size) var(--size),
		linear-gradient(var(--line) 1px, transparent 1px var(--size)) 50% 50% /
			var(--size) var(--size);
	mask: linear-gradient(-25deg, transparent 65%, white);
	top: 0;
	transform-style: flat;
	pointer-events: none;
	z-index: -1;
}

main {
	transform-style: preserve-3d;
	position: relative;
	transition: scale 0.2s;
	height: 100svh;
	display: grid;
	place-items: center;
	width: 100%;
}

.container {
	--scroll-padding: 0px;
	--inner-angle: calc((360 / var(--total)) * 1deg);
	--item-width: clamp(120px, 20vmin, 12rem);
	--scroll-buff: calc(var(--item-width) * var(--scroll-ratio));
	--gap: calc(var(--item-width) * var(--gap-efficient, 0.1));
	--radius: calc(((var(--item-width) + var(--gap)) / sin(var(--inner-angle))) * -1);
	position: relative;
	width: 100%;
	height: 100%;
	overflow: auto;
	timeline-scope: --controller;
}

[data-infinite="true"] .container {
	--scroll-padding: calc(var(--item-width) * 0.01);
	--scroll-padding: 5px;
}

ul {
	list-style-type: none;
	padding: 0;
	margin: 0;
	display: grid;
}

img {
	border-radius: 12px;
	width: 100%;
	height: 100%;
	background-color: color-mix(in lch, canvasText 25%, canvas);
}

h1 {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  color: color-mix(in lch, canvasText, transparent);
  opacity: 0;
  transition: opacity 0.2s;
}

[data-scroll=true] h1 {
  opacity: 1;
}

.carousel {
	padding: 0;
}

.carousel {
	display: flex;
}

.carousel {
	width: 100%;
	height: 100%;
	position: absolute;
	left: 50%;
	top: 50%;
	translate: -50% -50%;
}

.carousel-container {
	height: 100%;
	width: 100%;
	mask: linear-gradient(
		calc(90deg + (var(--rotate-z) * 1deg)),
		transparent 0 calc(50% - (var(--item-width) * var(--mask-upper))),
		white calc(50% - (var(--mask-lower) * var(--item-width))) calc(50% + (var(--mask-lower) * var(--item-width))),
		transparent calc(50% + (var(--mask-upper) * var(--item-width))) 100%
	);
	pointer-events: none;
	position: absolute;
	display: grid;
	place-items: center;
	inset: 0;
	transform-style: preserve-3d;
	perspective: calc(var(--perspective) * 1px);
	overflow: hidden;
}

[data-scroll="true"] .carousel::after,
[data-animate="true"] .carousel::after {
	animation: shine calc(var(--total) * 0.5s) infinite linear;
}
[data-scroll="true"] .carousel,
[data-animate="true"] .carousel {
	animation: carousel calc(var(--total) * 0.5s) infinite linear;
}
.carousel {
	transform-style: preserve-3d;
	transform: translate3d(0, 0, var(--radius)) rotateX(calc(var(--rotate-x) * 1deg)) rotateZ(calc(var(--rotate-z) * 1deg)) rotateY(0deg);
}

@keyframes carousel {
	to {
		transform: translate3d(0, 0, var(--radius)) rotateX(calc(var(--rotate-x) * 1deg)) rotateZ(calc(var(--rotate-z) * 1deg)) rotateY(-360deg);
	}
}

@supports(animation-timeline: scroll()) {
  [data-scroll="true"] .carousel,
  [data-scroll="true"] .carousel::after {
    animation-duration: auto;
    animation-iteration-count: 1;
    animation-fill-mode: both;
    animation-timeline: --controller;
  }
}

.carousel::after {
	content: "";
	position: absolute;
	top: 50%;
	left: 50%;
	width: calc(var(--item-width) * 1.5);
	height: calc(var(--item-width) * 1.5);
	backdrop-filter: brightness(2);
	mask: radial-gradient(80% 80% at 50% 50%, white, transparent 50%);
	transform: translate(-50%, -50%) rotateY(0deg) translate3d(0, 0, calc((var(--radius) - 10px) * -1));
}

@keyframes shine {
	to {
		transform: translate(-50%, -50%) rotateY(360deg) translate3d(0, 0, calc((var(--radius) - 10px) * -1));
	}
}

[data-gsap="true"] .carousel::after {
	animation: none;
	transform: translate(-50%, -50%) rotateY(calc(var(--rotate) * 1deg)) translate3d(0, 0, calc((var(--radius) - 10px) * -1));
}

.carousel li {
	--debug: red;
	height: var(--item-width);
	width: var(--item-width);
	outline-offset: 2px;
}

.carousel li {
	position: absolute;
	top: 50%;
	left: 50%;
	backface-visibility: hidden;
	transform:
	  translate(-50%, -50%)
	  rotateY(calc((var(--inner-angle) * var(--index))))
	  translate3d(0, 0, calc(var(--radius) * -1));
}

[data-backface="true"] .carousel li {
	backface-visibility: visible;
}

.controller {
	display: flex;
	overflow: auto;
	width: 100%;
	height: 100%;
	scroll-snap-type: x mandatory;
	scroll-timeline: --controller inline;
	align-items: center;
	padding-inline: calc((50vw + var(--scroll-padding)) - (var(--scroll-buff) * 0.5));
}

[data-vertical="true"] .controller {
	flex-direction: column;
	scroll-snap-type: y mandatory;
	scroll-timeline: --controller;
	padding-inline: 0;
	padding-block: calc((50svh + var(--scroll-padding)) - (var(--scroll-buff) * 0.5));
}

.controller li {
	--debug: red;
	height: var(--scroll-buff);
	width: var(--scroll-buff);
	aspect-ratio: 1;
	flex: 1 0 auto;
	scroll-snap-align: center;
}

[data-debug="true"] li {
	outline: 2px dashed var(--debug);
}

/*.carousel {
	animation: carousel both linear;
	animation-timeline: --controller;
	animation-range: var(--scroll-padding) calc(100% - var(--scroll-padding));
}*/

/*.carousel li {
	filter: saturate(0.75) brightness(0.75);
}*/

div.tp-lblv_v {
	flex-shrink: 1;
	width: auto;
}

div.tp-dfwv {
	width: 300px;
}

.bear-link {
	color: canvasText;
	position: fixed;
	bottom: 1rem;
	left: 1rem;
	width: 48px;
	aspect-ratio: 1;
	display: grid;
	place-items: center;
	opacity: 0.8;
}

:where(.x-link, .bear-link):is(:hover, :focus-visible) {
	opacity: 1;
}
.bear-link svg {
	width: 75%;
}

console.log("Event Fired")
import { Pane } from 'https://cdn.skypack.dev/tweakpane'
import gsap from 'https://cdn.skypack.dev/gsap@3.12.0'
import { ScrollTrigger } from 'https://cdn.skypack.dev/gsap@3.12.0/ScrollTrigger'

const CONFIG = {
  debug: false,
  // spread: false,
  // zoom: false,
  backface: false,
  // rotate: false,
  buff: 2,
  animate: true,
  scroll: true,
  dark: true,
  masklower: 0.9,
  maskupper: 1.8,
  perspective: 320,
  vertical: false,
  infinite: false,
  items: 16,
  gap: 0.1,
  rotatex: 0,
  rotatez: 0,
}

const MAIN = document.querySelector('main')

const generateItems = () => {
  const items = []
  const controllers = []

for (let i = 0; i < CONFIG.items + 1; i++) {
    // scopes.push(`--item-${i}`)
    if (i !== CONFIG.items) {
      items.push(`
        <li style="--index: ${i};">
          <img src="https://picsum.photos/300/300?random=${i}" alt="" />
        </li>
      `)
    }
    controllers.push('<li></li>')
  }

return {
    items: items.join(''),
    controllers: controllers.join(''),
  }
}

let scroller

const handleScroll = () => {
  if (!CONFIG.infinite) return false
  if (CONFIG.vertical) {
    if (scroller.scrollTop + window.innerHeight > scroller.scrollHeight - 2) {
      scroller.scrollTop = 2
    }
    if (scroller.scrollTop < 2) {
      scroller.scrollTop = scroller.scrollHeight - 2
    }
  } else {
    if (scroller.scrollLeft + window.innerWidth > scroller.scrollWidth - 2) {
      scroller.scrollLeft = 2
    }
    if (scroller.scrollLeft < 2) {
      scroller.scrollLeft = scroller.scrollWidth - 2
    }
  }
}

const setupController = () => {
  scroller = document.querySelector('.controller')
  scroller.addEventListener('scroll', handleScroll)
}

const render = () => {
  const { controllers, items } = generateItems()
  MAIN.innerHTML = `
    <div class="container" style="--total: ${CONFIG.items};">
      <div class="carousel-container">
        <ul class="carousel">
          ${items}
        </ul>
      </div>
      <ul class="controller">
        ${controllers}
      </ul>
    </div>
  `
  setupController()
}

let tween

const update = () => {
  document.documentElement.dataset.debug = CONFIG.debug
  // document.documentElement.dataset.spread = CONFIG.spread
  // document.documentElement.dataset.zoom = CONFIG.zoom
  // document.documentElement.dataset.rotate = CONFIG.rotate
  document.documentElement.dataset.animate = CONFIG.animate
  document.documentElement.dataset.backface = CONFIG.backface
  document.documentElement.dataset.scroll = CONFIG.scroll
  document.documentElement.dataset.dark = CONFIG.dark
  document.documentElement.dataset.vertical = CONFIG.vertical
  document.documentElement.dataset.infinite = CONFIG.infinite
  document.documentElement.style.setProperty('--gap-efficient', CONFIG.gap)
  document.documentElement.style.setProperty('--rotate-x', CONFIG.rotatex)
  document.documentElement.style.setProperty('--rotate-z', CONFIG.rotatez)
  document.documentElement.style.setProperty('--mask-lower', CONFIG.masklower)
  document.documentElement.style.setProperty('--mask-upper', CONFIG.maskupper)
  document.documentElement.style.setProperty('--scroll-ratio', CONFIG.buff)
  document.documentElement.style.setProperty(
    '--perspective',
    CONFIG.perspective
  )
  // If we're scroll driving, use GSAP
  if (
    !CSS.supports('animation-timeline: scroll()') &&
    CONFIG.scroll &&
    CONFIG.animate
  ) {
    // transform: translate3d(0, 0, var(--radius)) rotateX(calc(var(--rotate-x) * 1deg)) rotateZ(calc(var(--rotate-z) * 1deg)) rotateY(-360deg);
    if (scroller) scroller[CONFIG.vertical ? 'scrollTop' : 'scrollLeft'] = 0
    document.documentElement.dataset.gsap = true
    gsap.registerPlugin(ScrollTrigger)
    gsap.set(['.carousel'], { animation: 'none', '--rotate': 0 })
    tween = gsap.to('.carousel', {
      rotateY: -360,
      '--rotate': 360,
      ease: 'none',
      scrollTrigger: {
        horizontal: !CONFIG.vertical,
        scroller: '.controller',
        scrub: true,
      },
    })
  } else {
    document.documentElement.dataset.gsap = false
    gsap.set('.carousel', { clearProps: true })
    if (tween) tween.kill()
    ScrollTrigger.killAll()
    document.querySelector('.carousel').removeAttribute('style')
  }
}

const sync = (event) => {
  if (
    !document.startViewTransition ||
    !event ||
    (event &&
      event.target.controller.view.labelElement.innerText !== 'Dark Theme' &&
      event.target.controller.view.labelElement.innerText !== 'Backface')
  )
    return update()
  document.startViewTransition(update)
}

const controlPanel = new Pane({ title: 'Config', expanded: false })

// const spreader = controlPanel.addBinding(CONFIG, 'spread', { label: 'Spread' })
// controlPanel.addBinding(CONFIG, 'zoom', { label: 'Zoom' })
// controlPanel.addBinding(CONFIG, 'rotate', { label: 'Rotate' })
controlPanel.addBinding(CONFIG, 'animate', { label: 'Animate' })
const scrolling = controlPanel.addFolder({
  title: 'Scrolling',
  expanded: false,
})
scrolling.addBinding(CONFIG, 'scroll', { label: 'Scroll Drive' })
scrolling.addBinding(CONFIG, 'vertical', { label: 'Vertical' })
scrolling.addBinding(CONFIG, 'infinite', { label: 'Infinite' })
scrolling.addBinding(CONFIG, 'buff', {
  label: 'Ratio',
  min: 1,
  max: 10,
  step: 0.1,
})
scrolling.addBinding(CONFIG, 'debug', { label: 'Debug' })
const rotation = controlPanel.addFolder({ title: 'Rotation', expanded: false })
rotation.addBinding(CONFIG, 'rotatex', {
  min: 0,
  max: 360,
  step: 1,
  label: 'X',
})
rotation.addBinding(CONFIG, 'rotatez', {
  min: 0,
  max: 360,
  step: 1,
  label: 'Z',
})
const masker = controlPanel.addFolder({ title: 'Mask', expanded: false })
masker.addBinding(CONFIG, 'masklower', {
  label: 'Lower (Item W)',
  min: 0,
  max: 5,
  step: 0.1,
})
masker.addBinding(CONFIG, 'maskupper', {
  label: 'Upper (Item W)',
  min: 0,
  max: 5,
  step: 0.1,
})

controlPanel.addBinding(CONFIG, 'backface', { label: 'Backface' })
controlPanel.addBinding(CONFIG, 'perspective', {
  label: 'Perspective (px)',
  min: 50,
  max: 1500,
  step: 1,
})
controlPanel.addBinding(CONFIG, 'gap', {
  label: 'Gap (%)',
  min: 0,
  max: 5,
  step: 0.1,
})
const itemSwitch = controlPanel.addBinding(CONFIG, 'items', {
  label: 'Items',
  min: 10,
  max: 50,
  step: 1,
})
controlPanel.addBinding(CONFIG, 'dark', { label: 'Dark Theme' })

render()
sync()

controlPanel.on('change', sync)
// spreader.on('change', render)
itemSwitch.on('change', render)

if (!CSS.supports('animation-timeline: scroll()')) {
  gsap.registerPlugin(ScrollTrigger)
}

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