Install
That writescompositions/components/hw-boil.html, plus 1 supporting file under assets/fonts/.
Paste it into your composition
Opencompositions/components/hw-boil.html and copy what is inside into your own composition.
A component has no size or duration of its own. It takes both from the composition
you paste it into.
Source
hw-boil.html
hw-boil.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
/* Caveat is NOT auto-resolved by the renderer — bundle it. Asset
paths are ROOT-RELATIVE (the project root is the base URL for all
compositions; ../ traversal is a lint error). Registry installs
ship the woff2 as an asset file targeting assets/fonts/. */
@font-face {
font-family: "Caveat";
src: url("assets/fonts/Caveat-700-latin.woff2") format("woff2");
font-weight: 700;
font-display: block;
}
*,
*::before,
*::after {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
background: transparent;
overflow: hidden;
}
/* ---- hw-boil -----------------------------------------------------
The hand-drawn "boil": jitter that re-poses only every N frames
(quake + frame-drop style). Pose is a pure function of quantized
timeline time through a seeded hash — fully seek-safe, renders
identically on every pass over the same frame.
RULES:
- hwBoil owns x/y/rotation of the boiled element. Entrance/exit
tweens go on a WRAPPER around it, never the boiled element.
- One timeline has ONE onUpdate — hwOnUpdate is the dispatcher
that lets the boil coexist with sweep scalars etc. Register
every onUpdate-style render through it. */
#hw-boil-root {
--hw-font-print: "Caveat", cursive;
--hw-font-script: "Caveat", cursive;
--hw-ink: #f4f2ec;
--hw-accent: #6d6dff;
position: relative;
width: 1920px;
height: 1080px;
overflow: hidden;
background: #17161a;
font-family: var(--hw-font-print, "Caveat", cursive);
}
#hw-boil-root svg {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
}
#hw-boil-root path {
fill: none;
stroke: var(--hw-ink);
stroke-width: 6;
stroke-linecap: round;
stroke-linejoin: round;
}
#hw-b-arrow {
stroke: var(--hw-accent);
stroke-width: 7;
}
.hw-b-label {
position: absolute;
font-weight: 700;
font-size: 84px;
color: var(--hw-ink);
white-space: nowrap;
}
.hw-b-tag {
position: absolute;
font-family: "Inter", ui-sans-serif, sans-serif;
font-weight: 500;
font-size: 22px;
letter-spacing: 0.12em;
color: rgba(244, 242, 236, 0.45);
}
</style>
</head>
<body>
<!-- Self-preview. WIRING: copy the hwOnUpdate / hwHash / hwBoil /
hwWobbleEllipse helpers into your host script, then:
hwBoil(tl, "#hw-my-annotation", { amp: 1.6, rot: 0.5, frameDrop: 3, seed: 2 });
frameDrop 3-4 = classic boil; 1 = frantic; boil: off = don't call it. -->
<div
id="hw-boil-root"
data-composition-id="hw-boil"
data-start="0"
data-duration="4"
data-width="1920"
data-height="1080"
>
<svg viewBox="0 0 1920 1080">
<g id="hw-b-circle-g"><path id="hw-b-circle"></path></g>
<g id="hw-b-arrow-g">
<path
id="hw-b-arrow"
d="M 640 640 C 760 700, 980 720, 1130 620 M 1130 620 l -64 -6 M 1130 620 l -18 58"
></path>
</g>
</svg>
<div class="hw-b-label" id="hw-b-word" style="left: 1230px; top: 560px">the boil</div>
<div class="hw-b-tag" style="left: 350px; top: 782px">FRAME DROP 3</div>
<div class="hw-b-tag" style="left: 700px; top: 782px">FRAME DROP 1</div>
<div class="hw-b-tag" style="left: 1230px; top: 700px">TEXT, AMP 1.2</div>
<div
id="hw-b-drv"
class="clip"
data-start="0"
data-duration="4"
data-track-index="0"
style="position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none"
></div>
</div>
<script>
(function () {
window.__timelines = window.__timelines || {};
// ---- copy these helpers into the host script ----
// Dispatcher: a GSAP timeline has ONE onUpdate. Register every
// per-frame render (boils, sweep scalars) through this instead of
// setting eventCallback directly, and they all coexist.
window.hwOnUpdate = function (tl, fn) {
if (!tl.__hwRenders) {
tl.__hwRenders = [];
tl.eventCallback("onUpdate", function () {
for (var i = 0; i < tl.__hwRenders.length; i++) tl.__hwRenders[i]();
});
}
tl.__hwRenders.push(fn);
fn();
};
// Seeded hash -> [-1, 1]. Pure function of n — no Math.random().
window.hwHash = function (n, seed) {
var x = Math.sin(n * 127.1 + (seed || 1) * 311.7) * 43758.5453;
return (x - Math.floor(x)) * 2 - 1;
};
// The boil. Owns x/y/rotation of its targets — put entrance tweens
// on a wrapper. frameDrop = re-pose every N frames (3-4 classic).
window.hwBoil = function (tl, target, opts) {
opts = opts || {};
var amp = opts.amp !== undefined ? opts.amp : 1.6;
var rot = opts.rot !== undefined ? opts.rot : 0.5;
var fps = opts.fps || 30;
var drop = opts.frameDrop || 3;
var seed = opts.seed || 1;
var els = gsap.utils.toArray(target);
window.hwOnUpdate(tl, function () {
var step = Math.floor((tl.time() * fps) / drop);
for (var i = 0; i < els.length; i++) {
gsap.set(els[i], {
x: window.hwHash(step * 3 + i * 97, seed) * amp,
y: window.hwHash(step * 3 + 1 + i * 97, seed) * amp,
rotation: (opts.baseRot || 0) + window.hwHash(step * 3 + 2 + i * 97, seed) * rot,
});
}
});
};
// Seeded hand-wobbled ellipse path (smooth quadratic chain).
window.hwWobbleEllipse = function (cx, cy, rx, ry, seed, wobblePct) {
wobblePct = wobblePct === undefined ? 3 : wobblePct;
var N = 14,
pts = [];
for (var i = 0; i < N; i++) {
var a = (i / N) * Math.PI * 2;
var wr = 1 + window.hwHash(i * 13 + 5, seed) * (wobblePct / 100);
pts.push([cx + Math.cos(a) * rx * wr, cy + Math.sin(a) * ry * wr]);
}
var mx = (pts[0][0] + pts[N - 1][0]) / 2,
my = (pts[0][1] + pts[N - 1][1]) / 2;
var d = "M" + mx.toFixed(1) + " " + my.toFixed(1);
for (var j = 0; j < N; j++) {
var p = pts[j],
q = pts[(j + 1) % N];
d +=
" Q" +
p[0].toFixed(1) +
" " +
p[1].toFixed(1) +
" " +
((p[0] + q[0]) / 2).toFixed(1) +
" " +
((p[1] + q[1]) / 2).toFixed(1);
}
return d;
};
// ---- self-preview (not part of the snippet you copy) ----
var circle = document.getElementById("hw-b-circle");
circle.setAttribute("d", window.hwWobbleEllipse(460, 620, 190, 130, 4, 3.2));
var tl = gsap.timeline({ paused: true });
/* draw-on entrances (strokeDashoffset — never x/y, the boil owns those) */
[circle, document.getElementById("hw-b-arrow")].forEach(function (p, i) {
var len = p.getTotalLength();
gsap.set(p, { strokeDasharray: len, strokeDashoffset: len });
tl.to(p, { strokeDashoffset: 0, duration: 0.8, ease: "power2.inOut" }, 0.3 + i * 0.35);
});
gsap.set("#hw-b-word", { opacity: 0 });
tl.to("#hw-b-word", { opacity: 1, duration: 0.5, ease: "power2.out" }, 1.1);
/* three boils with different characters, one dispatcher */
window.hwBoil(tl, "#hw-b-circle-g", { amp: 2.2, rot: 0.4, frameDrop: 3, seed: 2 });
window.hwBoil(tl, "#hw-b-arrow-g", { amp: 2.6, rot: 0.7, frameDrop: 1, seed: 5 });
window.hwBoil(tl, "#hw-b-word", { amp: 1.2, rot: 0.35, frameDrop: 3, seed: 9 });
tl.set("#hw-boil-root", { visibility: "hidden" }, 3.98);
window.__timelines["hw-boil"] = tl;
})();
</script>
</body>
</html>
handwritten effect annotation.