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Refactor tilt animation engine for performance and maintainability #157

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Refactor tilt animation engine for performance and maintainability #157

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4cf5281
Refactor tilt animation engine for performance and maintainability
Katotodan Mar 9, 2026
1606cd9
Merge branch 'meshery-extensions:master' into chore/animation
Katotodan Mar 23, 2026
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265 changes: 172 additions & 93 deletions static/scripts/hero-glass.js
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Original file line number Diff line number Diff line change
@@ -1,99 +1,178 @@
const root = document.documentElement;
const hero = document.querySelector("#hero");
const tiltTargets = document.querySelectorAll("[data-tilt]");
const floaters = document.querySelectorAll("[data-float]");

let frame;
let heroInView = true;
let heroRect = null;
let heroRectDirty = true;
const pointer = {
x: window.innerWidth / 2,
y: window.innerHeight / 2,
};

const scheduleUpdateScene = () => {
if (!frame) {
frame = requestAnimationFrame(updateScene);
}
};

const refreshHeroRect = () => {
if (!hero || !heroInView) return;
heroRect = hero.getBoundingClientRect();
heroRectDirty = false;
};

const updateScene = () => {
root.style.setProperty("--cursor-x", `${pointer.x}px`);
root.style.setProperty("--cursor-y", `${pointer.y}px`);

if (hero && heroInView) {
if (heroRectDirty || !heroRect) {
refreshHeroRect();
(() => {
"use strict";

const root = document.documentElement;
const hero = document.querySelector("#hero");
const tiltTargets = document.querySelectorAll("[data-tilt]");
const floaters = document.querySelectorAll("[data-float]");

const state = {
pointer: {
x: window.innerWidth / 2,
y: window.innerHeight / 2
},
visibleTargets: new Set(),
rectCache: new Map(),
frame: null,
isDirty: true
};

/**
* Intersection Observer
* Tracks elements that are visible.
*/
const observer = new IntersectionObserver((entries) => {
entries.forEach((entry) => {

if (entry.isIntersecting) {
state.visibleTargets.add(entry.target);
state.isDirty = true;
} else {
state.visibleTargets.delete(entry.target);
state.rectCache.delete(entry.target);

entry.target.style.setProperty("--tilt-x", "0deg");
entry.target.style.setProperty("--tilt-y", "0deg");
}

});
}, { threshold: 0.1 });

if (hero) observer.observe(hero);
tiltTargets.forEach(el => observer.observe(el));

/**
* Resize Observer
* Marks layout as dirty only when elements actually resize.
*/
const resizeObserver = new ResizeObserver(() => {
state.isDirty = true;
});

if (hero) resizeObserver.observe(hero);
tiltTargets.forEach(el => resizeObserver.observe(el));

/**
* GPU hint for smoother animations
*/
tiltTargets.forEach(el => {
el.style.willChange = "transform";
});

/**
* Measurement Phase (Read)
*/
const refreshRects = () => {
state.visibleTargets.forEach(el => {
state.rectCache.set(el, el.getBoundingClientRect());
});

state.isDirty = false;
};

/**
* Render Phase (Write)
*/
const updateScene = () => {
root.style.setProperty("--cursor-x", `${state.pointer.x}px`);
root.style.setProperty("--cursor-y", `${state.pointer.y}px`);

if (state.visibleTargets.size === 0) {
state.frame = null;
return;
}
const relX = (pointer.x - heroRect.left) / heroRect.width - 0.5;
const relY = (pointer.y - heroRect.top) / heroRect.height - 0.5;
hero.style.setProperty("--tilt-x", `${(-relY * 7).toFixed(2)}deg`);
hero.style.setProperty("--tilt-y", `${(relX * 9).toFixed(2)}deg`);
}

tiltTargets.forEach((target) => {
const rect = target.getBoundingClientRect();
const relX = (pointer.x - rect.left) / rect.width - 0.5;
const relY = (pointer.y - rect.top) / rect.height - 0.5;
target.style.setProperty("--tilt-x", `${(-relY * 6).toFixed(2)}deg`);
target.style.setProperty("--tilt-y", `${(relX * 6).toFixed(2)}deg`);

if (state.isDirty) refreshRects();

state.visibleTargets.forEach((el) => {

const rect = state.rectCache.get(el);
if (!rect) return;

const relX = (state.pointer.x - rect.left) / rect.width - 0.5;
const relY = (state.pointer.y - rect.top) / rect.height - 0.5;

const intensity = el === hero ? 10 : 6;

const tiltX = Math.round(-relY * intensity * 100) / 100;
const tiltY = Math.round(relX * intensity * 100) / 100;

el.style.setProperty("--tilt-x", `${tiltX}deg`);
el.style.setProperty("--tilt-y", `${tiltY}deg`);
});

state.frame = null;
};

const scheduleUpdate = () => {
if (!state.frame) {
state.frame = requestAnimationFrame(updateScene);
}
};

/**
* Pointer Movement
*/
window.addEventListener("pointermove", (e) => {

if (
e.clientX === state.pointer.x &&
e.clientY === state.pointer.y
) return;

state.pointer.x = e.clientX;
state.pointer.y = e.clientY;

scheduleUpdate();

}, { passive: true });

/**
* Touch / pointer down responsiveness
*/
window.addEventListener("pointerdown", (e) => {
state.pointer.x = e.clientX;
state.pointer.y = e.clientY;
scheduleUpdate();
}, { passive: true });

/**
* Reset pointer when leaving window
*/
window.addEventListener("pointerleave", () => {
state.pointer.x = window.innerWidth / 2;
state.pointer.y = window.innerHeight / 2;
scheduleUpdate();
});

frame = null;
};

const handlePointer = (event) => {
pointer.x = event.clientX;
pointer.y = event.clientY;
scheduleUpdateScene();
};

window.addEventListener("pointermove", handlePointer, { passive: true });
window.addEventListener("pointerdown", handlePointer, { passive: true });
window.addEventListener("pointerleave", () => {
pointer.x = window.innerWidth / 2;
pointer.y = window.innerHeight / 2;
scheduleUpdateScene();
});
window.addEventListener("resize", () => {
pointer.x = window.innerWidth / 2;
pointer.y = window.innerHeight / 2;
heroRectDirty = true;
scheduleUpdateScene();
}, { passive: true });
window.addEventListener("scroll", () => {
heroRectDirty = true;
}, { passive: true });

if (hero) {
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
heroInView = entry.isIntersecting;
if (!heroInView) {
hero.style.setProperty("--tilt-x", "0deg");
hero.style.setProperty("--tilt-y", "0deg");
heroRect = null;
} else {
heroRectDirty = true;
scheduleUpdateScene();
}
/**
* Scroll Throttling
*/
let scrollTick = false;

window.addEventListener("scroll", () => {

if (!scrollTick) {
scrollTick = true;

requestAnimationFrame(() => {
state.isDirty = true;
scrollTick = false;
});
},
{ threshold: 0.2 },
);
observer.observe(hero);
}
}

}, { passive: true });

/**
* Floater Animation Delays
*/
floaters.forEach((item, index) => {
item.style.animationDelay = `${index * -0.5}s`;
});

floaters.forEach((item, index) => {
item.style.animationDelay = `${index * -2.5}s`;
});
/**
* Initial Run
*/
updateScene();

updateScene();
})();
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